March 22 2005Julia Becker, Dortmund University March 22 2005 Prediction of Coincidence neutrino spectra from GRBs...and a comparison to average spectra.

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Presentation transcript:

March Julia Becker, Dortmund University March Prediction of Coincidence neutrino spectra from GRBs...and a comparison to average spectra

March Julia Becker, Dortmund University Overview I.Short introduction to neutrino spectra I.The diffuse spectrum II.Burst samples: I.Neutrino flux parameters II.Coincidence and mean spectra III.Summary

March Julia Becker, Dortmund University The bigger picture Pendleton, G. et. al. Astrophysical Journal, (1999)

March Julia Becker, Dortmund University GRB Spectrum (I) e.g. Waxman/Bahcall, astro-ph/

March Julia Becker, Dortmund University GRB Spectrum (II) f  : fraction of proton energy going into pions f e : fraction of electron to proton total energy  per particle

March Julia Becker, Dortmund University The WB Spectrum    Waxman/Bahcall, astro-ph/

March Julia Becker, Dortmund University Burst Samples  Variability: 568 bursts [Guetta et al.]  Lag: 292 bursts [Band et al.]  Subsample from variability sample: 82 bursts within AMANDA field of view

March Julia Becker, Dortmund University Neutrino-Parameters (I) variability lag

March Julia Becker, Dortmund University Neutrino-Parameters (II) variability lag

March Julia Becker, Dortmund University Neutrino-Parameter (III) variability lag

March Julia Becker, Dortmund University e.g. 82 single burst spectra: Log(  GeV/s/sr/cm**2) Log(E/GeV)

March Julia Becker, Dortmund University …and the coincidence spectrum Log(  GeV/s/sr/cm**2) Log(E/GeV)

March Julia Becker, Dortmund University Comparison of mean and coincidence spectra

March Julia Becker, Dortmund University Sample comparison

March Julia Becker, Dortmund University Summary and Conculsions  Two different burst samples  Basic model of WB  Difference: Adjust parameters to single bursts  Result: Samples differ from each other Samples show different spectra than WB Even average spectra are not consistent with WB

March Julia Becker, Dortmund University The Future

March Julia Becker, Dortmund University Upcoming internal report…  …preliminary version at app.uni-dortmund.de/~julia/  …to be finalized about a week after Easter

March Julia Becker, Dortmund University Redshift estimators  Variability  Lag  Peak energy

March Julia Becker, Dortmund University Variabilility Fenimore/Ramirez-Ruiz, astro-ph/

March Julia Becker, Dortmund University Temporal Lag Norris, astro-ph/

March Julia Becker, Dortmund University GRB1122 Energy Spectra    b = ± 2.1 keV  = ±  = ± 0.07  bbbb Band et al., ApJ 413 (1993)

March Julia Becker, Dortmund University Peak-Energy Amati, astro-ph/

March Julia Becker, Dortmund University Further reading and references  Reviews: Piran, astro-ph/ Zhang & Meszaros, astro-ph/  Experiments:  Observations: Pendleton et al., ApJ, 1999 (Isotropic GRB distribution) Matheson et al., astro-ph/ (SN-GRB connection) Band et al, ApJ 413, 1999 (Band fits to energy spectra)  On neutrinos from GRBs: Guetta et al., Astroparticle Physics 20, 2004 Halzen&Hooper, Rep. Prog. Phys. 65, 2002 Hardtke et al. for the AMANDA collaboration, ICRC Proc. 2003