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Neutrino astronomy Rapporteur report I c e C u b e p r e l i m i n a r y Markus Ackermann The young field of high-energy neutrino astrophysics 2013 High-energy neutrino astrophysics* started with the discovery of a

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Neutrino astronomy

Rapporteur report

Markus Ackermann I c e C u b e p r e l i m i n a r y

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

The young field of high-energy neutrino astrophysics

▶︎ High-energy neutrino astrophysics* started with

the discovery of a cosmic neutrino flux by IceCube in 2013

▶︎ This is year 4 in the young field of neutrino

astrophysics

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2013 2017

* above MeV energies, where the sun and SN1987a had been observed in neutrinos long before.

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

What you should NOT expect in a very young field

▶︎ Don’t expect to see a sky like this. ▶︎ 2017 is the 50th anniversary* of gamma-ray astronomy.

3

* The first GRB was recorded by the 
 Vela 4 satellite on July 2nd, 1967

The Fermi LAT sky above 10 GeV

Fermi LAT collaboration
 arXiv:1702.0066

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Year 5 in gamma-ray astronomy

▶︎ First full-sky map from OSO-3

satellite data.

▶︎ 621 photons recorded above 50

MeV.

▶︎ No gamma-ray sources, but

galactic plane visible.

4

Kraushaar et al., ApJ, 1972

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Year 5 in gamma-ray astronomy

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Kraushaar et al., ApJ, 1972

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

The uniqueness of neutrinos

▶︎ Neutrinos allow us to peek beyond the gamma-ray horizon… ▶︎ … and into environments opaque to electromagnetic radiation.

6

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Neutrino astrophysics at the ICRC 2017

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MeV solar and supernova neutrinos TeV - PeV neutrinos from cosmic accelerators EeV and beyond cosmogenic neutrinos (?)

Romero-Wolf et al., NU142

  • 3 highlight talks
  • 55 parallel talks
  • 79 posters
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ICRC2017 Topics

▶︎ Improving the measurement of spectrum &

properties of cosmic neutrino flux

◆ 20 contributions

▶︎ Searches for the origin of the diffuse cosmic

neutrino signal

◆ 34 contributions

▶︎ Modeling cosmic 𝜉 and their atmospheric

backgrounds

◆ 8 contributions

▶︎ MeV neutrinos from the sun or supernovas

◆ 16 contributions

▶︎ R&D and construction of new instrumentation

◆ 47 contributions

8

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ICRC2017 Topics

▶︎ Improving the measurement of spectrum &

properties of cosmic neutrino flux

◆ 20 contributions

▶︎ Searches for the origin of the diffuse cosmic

neutrino signal

◆ 34 contributions

▶︎ Modeling cosmic 𝜉 and their atmospheric

backgrounds

◆ 8 contributions

▶︎ MeV neutrinos from the sun or supernovas

◆ 16 contributions

▶︎ R&D and construction of new instrumentation

◆ 47 contributions

8

My sincere apologies for all the fantastic contributions that I cannot highlight 
 in the next 30+ minutes

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SLIDE 10

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ICRC2017 Topics

▶︎ Improving the measurement of spectrum &

properties of the cosmic neutrino flux

◆ 20 contributions

▶︎ Searches for the origin of the diffuse cosmic

neutrino signal

◆ 34 contributions

▶︎ Modeling cosmic 𝜉 and their atmospheric

backgrounds

◆ 8 contributions

▶︎ MeV neutrinos from the sun / supernovas

◆ 16 contributions

▶︎ R&D and construction of new instrumentation

◆ 47 contributions

9

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Cosmic neutrinos two years ago (ICRC 2015)

▶︎ Global analysis of multiple


event samples from IceCube.

▶︎ No indications for anisotropies or point sources. ▶︎ No neutrinos beyond PeV energies

10

4 years

HE starting events

3 years

through-going muons

2 years showers PL or PL+ exp. cutoff 
 fit all IceCube data

IceCube collaboration, PoS(ICRC2015)1066

𝛿=2.3 , Ecut=2.7 PeV 𝛿 = 2.5

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Cosmic neutrinos at ICRC 2017

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6 years

HE starting events

8 years

through-going muons

4 years showers

𝛿 = 2.9 𝛿 = 2.2 Energy range: 120 TeV - 5 PeV Energy range: >60 TeV

  • C. Kopper, PoS 981

C.Haack, PoS 1005

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Cosmic neutrinos at ICRC 2017

12

6 years

HE starting events

7 years

through-going muons

4 years showers

𝛿 = 2.5 Energy range: 12 TeV - 2.1 PeV

  • H. Niederhausen, PoS 968
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

A comparison of the spectral parameters

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4 (more) years showers 2 years showers 8 years

through-going muons

  • H. Niederhausen, PoS 968
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

A comparison of the spectral parameters

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4 (more) years showers 2 years showers 8 years

through-going muons

6 years

HE starting events

  • H. Niederhausen, PoS 968
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

An update to the IceCube global fit

▶︎ Global fit is needed to properly

evaluate spectral and flavor composition constraints

▶︎ In preparation but no results shown

here.

▶︎ Expect results “later this fall”.

14

Flavor composition sensitivity

  • C. Weaver, PoS 976
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Astrophysical tau neutrinos

▶︎ Search for characteristic 𝜉𝜐 signature ▶︎ Sensitive to 𝜉𝜐 with E > 100 TeV ▶︎ No tau neutrino candidate found in starting event

  • sample. Consistent with fluctuation.

▶︎ Future analysis will be extended to other data samples:

up to 50% more expected 𝜉𝜐 candidates

15

  • M. Usner, PoS 974
  • J. Stachurska, PoS 973
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Improving the sensitivity for PeV and beyond

▶︎ Neutrino interactions at the edge of the

instrumented volume of IceCube.

▶︎ New PeV event found that might be the

highest energy neutrino observed yet.

▶︎ Background probability and energy

reconstruction not finally assessed.

16

  • L. Lu, PoS 1002
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Delayed pulses from neutron capture

17

Simulation, NC events 100 TeV < E < 150 TeV IceCube data 1500 < NPE < 6000 (background dominated)

Li, Bustamante & Beacom, arXiv:1606.06290

  • A. Steuer, PoS 1008

▶︎ Delayed emission from neutron


capture can be used to distinguish hadronic from EM showers.

▶︎ Needs dedicated readout concept,

  • perational since Feb 2016.

▶︎ Promising for E>100 TeV showers

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Cosmogenic neutrinos

▶︎ Still no cosmogenic neutrinos found. ▶︎ Candidate radio event observed by ANITA. ▶︎ Would be inconsistent with AUGER / IceCube observations

18

Highlight talk by J. Alvarez-Muniz Romero-Wolf, NU142

  • S. Yoshida, PoS 975
  • E. Zas, PoS 972
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ICRC2017 Topics

▶︎ Improving the measurement of spectrum &

properties of the cosmic neutrino flux

◆ 20 contributions

▶︎ Searches for the origin of the diffuse cosmic

neutrino signal

◆ 34 contributions

▶︎ Modeling cosmic 𝜉 and their atmospheric

backgrounds

◆ 8 contributions

▶︎ MeV neutrinos from the sun / supernovas

◆ 16 contributions

▶︎ R&D and construction of new instrumentation

◆ 47 contributions

19

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Searches for cosmic neutrino sources

▶︎ ANTARES is more sensitive than IceCube on

parts of the Southern sky

▶︎ No point / extended sources of neutrinos found

20

  • G. Illuminati, PoS 986
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Search for neutrino emission from extended sources

▶︎ 7 years of IceCube data were

searched for evidence of an extended neutrino source.

▶︎ Source radii between 1º and 5º

tested.

▶︎ No indications found.

21

rsrc=2º rsrc=5º

E.Pinat, PoS 963

Sensitivity (90% CL uppe limit)

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Search for neutrinos from transients

▶︎ No significant correlation found with:

◆ Gamma-ray bursts ◆ Blazar flares ◆ Fast radio bursts ◆ Gravitational wave events ◆ X-ray flares ◆ X-ray binaries ◆ Supernovae ◆ IceCube events

22

  • A. Sanchez-Loza, PoS 971
  • A. Sanchez-Loza, PoS 970
  • M. Organokov, PoS 946

S.Celli, PoS 988

  • G. Illuminati, PoS 987
  • M. Sanguineti, PoS 1053

Meagher, PoS 1007

  • T. Pradier, PoS 947
  • C. Raab, PoS 957
  • D. Xu, PoS 980
  • A. Keivani, PoS 1015
  • T. Kintscher, PoS 969
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Cross-correlation & auto-correlation searches

▶︎ Cross- and autocorrelation searches

enhance detection power for weak neutrino sources.

▶︎ Nothing found. ▶︎ The neutrino sky is dominated by

low-luminosity and high-density source populations

23

2pt-autocorrelation

  • M. Huber, PoS 994

2FHL, 3LAC and 2WHSP blazars X-Correlation search

  • B. Baret, PoS 949

l

  • g

L ( 𝜉 ) / L ( X

  • r

a y ) Fraction of X-ray BLLacs emitting 𝜉

  • T. Glauch, PoS 1014

Discovery potential


  • f autocorrelation search for

BLLac population

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Cross-correlation with ultra-high-energy cosmic rays

▶︎ ~3σ correlation seen on previous


dataset for shower-type events

▶︎ Reduced to about ~2σ with new


IceCube/CR data added.

▶︎ No evidence for correlation from muon tracks ▶︎ No evidence for correlation found in ANTARES data

24

  • I. Al Samarai, PoS 961
  • I. di Palma, PoS 990
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Neutrinos from the Galactic plane

▶︎ No significant correlation with

Galactic plane found in either ANTARES or IceCube data.

▶︎ Galactic plane contribution limited

to small fraction of observed flux

25

  • C. Haack, PoS 1011
  • K. Krings, PoS 990
  • B. Baret, PoS 942

Template map

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ICRC2017 Topics

▶︎ Improving the measurement of spectrum &

properties of the cosmic neutrino flux

◆ 20 contributions

▶︎ Searches for the origin of the diffuse cosmic

neutrino signal

◆ 34 contributions

▶︎ Modeling cosmic 𝜉 and their atmospheric

backgrounds

◆ 8 contributions

▶︎ MeV neutrinos from the sun / supernovas

◆ 16 contributions

▶︎ R&D and construction of new instrumentation

◆ 47 contributions

26

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Modeling 𝜉-emission from specific sources - GRB

27

Injection of Si in GRB Nuclear cascade Propagation

  • D. Boncioli, PoS 1064

▶︎ Full modeling of

nuclear cascades in source and during propagation

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Modeling 𝜉-emission from specific sources - GRB

▶︎ Prediction of

prompt and cosmogenic neutrino spectra

28

Injection of Si in GRB Δ𝝍2 E x c l u d e d b y I c e C u b e G R B a n a l y s i s

Luminosity S i z e

  • f

e m i s s i

  • n

z

  • n

e

  • D. Boncioli, PoS 1064
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Modeling 𝜉-emission from specific sources - AGN accretion disks

▶︎ Nuclei accelerated in jet. ▶︎ Neutrons produced in interactions can

reach the accretion disk.

▶︎ Produce neutrinos in interactions with

accretion disk gas.

▶︎ 𝛿-rays are absorbed in accretion disk

radiation fields.

29

Expected extragalactic 𝜉 flux Source 𝜉 luminosity

W.Bednarek, PoS 1069

Fe, Si, … n 𝜉

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Modeling the atmospheric background.

▶︎ Recalculation of expected atmospheric

neutrino fluxes based on new CR flux model and other improvement

▶︎ Several other improvements. ▶︎ Decrease of 5% at ~ 10 GeV.

30

CR flux model Neutrino flux @ Kamioka

  • M. Honda, PoS 1022
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Modeling the atmospheric background.

▶︎ Data driven model for CR flux and

composition + uncertainties

▶︎ Possible large effect on expected

prompt flux at PeV energies

31

  • A. Fedynitch, PoS 1019

CR nucleon flux models

  • H. Dembinsky, CRI140

GlobalSplineFit Expected conv. & prompt 𝜉 flux

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ICRC2017 Topics

▶︎ Improving the measurement of spectrum &

properties of the cosmic neutrino flux

◆ 20 contributions

▶︎ Searches for the origin of the diffuse cosmic

neutrino signal

◆ 34 contributions

▶︎ Modeling cosmic 𝜉 and their atmospheric

backgrounds

◆ 8 contributions

▶︎ MeV neutrinos from the sun / supernovas

◆ 16 contributions

▶︎ R&D and construction of new instrumentation

◆ 47 contributions

32

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Solar neutrino results

▶︎ see review talk by T. Kajita for overview. ▶︎ Weak periodic signal observed in SK-I not

confirmed with SK-IV.

33

51521 events from the sun

  • T. Yano , PoS 1066
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Supernova relic neutrinos and SK-Gd

▶︎ SuperK is background limited in

searches for the 𝜉 background from supernovae.

▶︎ Addition of 0.2% Gadolinium allows

to reduce background and lower energy threshold.

34

  • L. Martí-Magro , PoS 1019

expected SN relic
 𝜉-spectrum expected background

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

EGADS Gadolinium test facility

35

Transparency of tank water Gadolinium concentration

  • L. Martí-Magro , PoS 1019
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

EGADS Gadolinium test facility

36

Radioisotope contamination Ongoing work with supplier companies and on
 filtration system to achieve physics goals

  • L. Martí-Magro , PoS 1019
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Expectations for Hyper-Kamiokande

37

  • T. Yano , PoS 954

D.Yeum , PoS 948

SN relic 𝜉 sensitivity 1 tank (Japan) 2 tanks (e.g. Japan+Korea) Expected SN-𝜉 per tank

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Expectations for Hyper-Kamiokande

38

  • T. Yano , PoS 954

D.Yeum , PoS 948

Expected SN-𝜉 time profile SN at distance 10 kpc

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ICRC2017 Topics

▶︎ Improving the measurement of spectrum &

properties of the cosmic neutrino flux

◆ 20 contributions

▶︎ Searches for the origin of the diffuse cosmic

neutrino signal

◆ 34 contributions

▶︎ Modeling cosmic 𝜉 and their atmospheric

backgrounds

◆ 8 contributions

▶︎ MeV neutrinos from the sun / supernovas

◆ 16 contributions

▶︎ R&D / construction of new instrumentation

◆ 47 contributions

39

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Future instrumentation overview

40

Present neutrino detectors KM3NeT, GVD IceCube-Gen2 ARA, ARIANNA, 
 EVA, GRAND sensitivity at EeV
 and beyond sensitivity at
 PeV energies complementarity, sensitivity to
 neutrino sources

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Future instrumentation overview

40

Present neutrino detectors KM3NeT, GVD IceCube-Gen2 ARA, ARIANNA, 
 EVA, GRAND sensitivity at EeV
 and beyond sensitivity at
 PeV energies complementarity, sensitivity to
 neutrino sources “precision frontier” “intensity frontier” “energy frontier”

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

The KM3Net detector - Performance

▶︎ Complete overview in A. Heijboer’s

highlight talk.

▶︎ Same instrumented volume, but better

angular resolution than IceCube

41

  • K. Melis, PoS 950
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SLIDE 45

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

The KM3Net detector - First results

▶︎ Depth dependence of muon rate measured with first two detection units

42

  • M. Jongen, PoS 1018
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SLIDE 46

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

The Gigaton Volume Detector (GVD)

▶︎ Located at Lake

Baikal

▶︎ 2 out of 8 clusters

installed and

  • perational

▶︎ First observations of

high-energy showers with first cluster

43

Cluster: 8 strings String: 36 OMs Op4cal module GVD-1 GVD-4 OMs 2304 10368 Clusters (8 Strings) 8 27 Depths, m 750 – 1275 600 – 1300

  • Eff. Volume (ESH > 100 ТeV)

0.4 km3 1.5 km3 525 m 120 m 700 m GVD-1: 8 clusters Direc4onal resolu4on Cascades: 3° – 5° Muons: 0.25° V.M. Aynutdinov, PoS 1034 B.A. Shaybonov, PoS 962

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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

IceCube-Gen2 performance

▶︎ IceCube-Gen2 will allow a precision

measurement of spectrum and flavor composition of the cosmic neutrino flux

▶︎ Differential flavor composition measurement

can give insights into the neutrino production environment.

44

  • J. v. Santen, PoS 991

IceCube-Gen2 flavor composition sensitivity

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SLIDE 48

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

New photo-sensors and calibration devices

45

Point source sensitivity improvement with new sensor technologies*

  • J. v. Santen, PoS 991

*fixed number

  • f 80 optical

modules per string

Camera system for quantitative
 measurements of “hole" ice 
 properties

  • L. Classen, PoS 1047
  • A. Ishihara, PoS 1051
  • A. Stoessl, PoS 1038
  • J. Kim, PoS 1040
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SLIDE 49

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ARA, ARIANNA & ANITA

46

Highlight talk by J. Alvarez-Muniz

…thanks a lot for this wonderful slide

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SLIDE 50

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ARA calibration/performance

47

▶︎ Tests of radio pulse propagation ▶︎ Confirms ice propagation model and simulations ▶︎ Evidence of birefringence seen

  • J. Kelley, PoS 1030
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SLIDE 51

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ARA calibration/performance

47

▶︎ Tests of radio pulse propagation ▶︎ Confirms ice propagation model and simulations ▶︎ Evidence of birefringence seen

Top antenna (vertical pol.) Bottom antenna (vertical pol.) Direct pulse Direct pulse Reflected pulse Reflected pulse

  • J. Kelley, PoS 1030
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ARA calibration/performance

47

▶︎ Tests of radio pulse propagation ▶︎ Confirms ice propagation model and simulations ▶︎ Evidence of birefringence seen

Top antenna (vertical pol.) Bottom antenna (vertical pol.) Direct pulse Direct pulse Reflected pulse Reflected pulse Time delay between horizontally / vertically polarized signals

  • J. Kelley, PoS 1030
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Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ARA phased array trigger

▶︎ Phased array trigger would lower threshold


for radio detectors to 1 PeV - 10 PeV

▶︎ Will be deployed for ARA in 2017/2018

48

Verification
 in anechoic
 chamber Simulation


  • f signal


rates

  • A. Vieregg, PoS 1013
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SLIDE 54

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

ARIANNA: Horizontal propagation in the firn ice

▶︎ Signal of pulse

  • bserved on far

away stations.

▶︎ Some of the radio

signal propagates horizontally through the firn layer.

▶︎ Similar

measurements exist from RICE array at South pole.

49

  • S. Barwick, PoS 1042
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SLIDE 55

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Sensitivity gains from horizontal propagation

▶︎ Surface (“combo”) stations at South Pole could

reach a similar sensitivity as ARA at 200m depth

50

Combo surface
 station

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SLIDE 56

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

Sensitivity of future radio neutrino detectors.

51

Highlight talk by J. Alvarez-Muniz

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SLIDE 57

Markus Ackermann | Neutrino astronomy - Rapporteur Report | ICRC 2017 - Busan, South Korea |

A short summary

▶︎ The measurement of the cosmic neutrino spectrum and flavor composition

progresses with the continued operation of IceCube.

▶︎ The origin of the cosmic neutrinos is constrained by IceCube and ANTARES.

◆ No positive evidence for the origin of the neutrinos so far.

▶︎ No clear evidence for neutrinos above the PeV scale (cosmogenic neutrinos) yet

from IceCube, AUGER or ANITA.

▶︎ Modeling efforts are continuing to predict signal and backgrounds….

◆ … and turn measurements and limits into physics constraints.

▶︎ SuperK-Gd and later HyperK will hopefully detect the SN relic background.

◆ It also is really about time for the next supernova in our Galaxy.

▶︎ Strong efforts to make the next generation instruments a reality.

◆ Underwater telescopes KM3NeT and GVD (better resolution, complementarity) ◆ IceCube-Gen2 (sensitivity at PeV) ◆ InIce / OverIce radio arrays (neutrinos at EeV and beyond)

52