IceCube Construction and Analysis Report

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Presentation transcript:

IceCube Construction and Analysis Report Martijn Duvoort Sterrekundig Instituut Utrecht Faculty of Science, Department of Physics and Astronomy, University of Utrecht Princetonplein 5, NL-3584 CC Utrecht, The Netherlands M.R.Duvoort@phys.uu.nl http://www.phys.uu.nl/~duvoort

Neutrino Astronomy protons E>1019 eV (<30 Mpc) neutrinos gammas < 50 Mpc for E<100 TeV Cosmic accelerator 1 pc ~ 3 ly ~ 1018 cm 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

Introducing IceCube 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

IceTop InIce IceCube Three more deployment seasons to finish in 2011 2007-2008: 18 2006-2007: 13 Strings 2005-2006: 8 Strings 2004-2005 : 1 String IceTop total of 40 Strings IceCube: 0.5 km3 AMANDA: 0.016 km3 Air shower detetor threshold ~ 300 TeV InIce first data 2005 upgoing muon 18. Juli 2005 70-80 Strings , 60 Optical Modules 17 m between Modules 125 m between Strings IceCube fügt sich ins Gesamtbild ein -> AMANDA 19 Strings 677 Modules Three more deployment seasons to finish in 2011 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

IceCube 40 First km-scale detector 31 times AMANDA Fully digital waveforms In-ice timing calibration 0.5 - 1 degree resolution (depending on track length) Data since March 2008 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

Drs. M.R. Duvoort - University of Utrecht 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

IC22 Events ( Red hits = early; yellow/green/blue = later ) IceCube DOM locations blue, AMANDA OM locations red Downward cosmic-ray event (“muon bundle”) Upward candidate n event 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

IceCube extensions – Deep Core IceCube DOM technology AMANDA has no veto coverage from top, (which is where the muons come from) Ice below 2100m is exceptionally clear, significantly better even than current ice model. Swedish proposal funded by Wallenberg Foundation 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

γ - ν coincident analysis per GRB Current GRB analyses γ - ν coincident analysis per GRB Fails in case of time difference Rolling time window Needs GRB with multiple ν detections Only 1 – 10% of GRBs will induce signal ν Halzen & Hooper 1999, Astrophys. J. 527 (1999) L93 Need new method Should cope with time difference Should allow for cumulative statistics 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

Stacking T T T + Need to cut the background! T T+∆ T-∆ T T+∆ T-∆ T T+∆ time T T+∆ T-∆ T T+∆ T-∆ T T+∆ T-∆ ν data Need to cut the background! + T T+∆ T-∆ 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

Stacking around the GRB Bkg suppression by GRB location 5 deg area around GRB position 0.5 – 1 deg resolution → cut bkg keep signal Used 100 GRBs background determination → off-time sample Signal + Background On-source Background Off-time 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

Sensitivity of our method Parameters determining sensitivity Number of bursts in sample Fraction f of GRBs which yield a signal ν Detection in case of 5 σ effect Minimal f as function of #GRBs for detection Swift and GLAST nicely coincide with IceCube 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

Conclusion 1 km3 ν detector: discovery in coming year(s) Astropart. Phys 28 (2008) 540 f: the fraction of GRBs inducing a signal ν 1 km3 ν detector: discovery in coming year(s) 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203

Current Status Data reconstruction 4 years of full AMANDA data 2 years of IceCube data Off-time bkg determination in process (blind) sample used to settle final analysis cuts Unblinding proposal expected this spring Run final analysis on unblinded sample 18-1-2019 Drs. M.R. Duvoort - University of Utrecht M.R.Duvoort@phys.uu.nl +31-(0)30-2535203