Gamma Ray Burst Discoveries with the Swift Mission

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Gamma Ray Burst Discoveries with the Swift Mission Neil Gehrels NASA/GSFC N2PS2 - GWU June 16, 2008

Swift Mission NASA MIDEX . T<10 sec T<90 sec T<2 min BAT XRT UVOT 3 instruments - BAT, -rays 15-350 keV - XRT, X-rays, 0.2-10 keV - UVOT, opt, 170-650 nm Rapid slewing spacecraft Launch November 20, 2004 UVOT Position - < 1 arcsec BAT Position - 2 arcmin XRT Position - 5 arcsec XRT BAT . T<10 sec T<90 sec T<2 min

Massive Star Core Collapse Accompanied by supernae Short GRBs: NS-NS Mergers Long GRBs: Massive Star Core Collapse GRB 050724 elliptical host GRB 080319B "naked eye: burst First afterglow and identification from Swift Brightest objects in universe: - 5.5 magnitude @ 7.5 billion lt yrs Chandra XRT In star forming galaxies Accompanied by supernae Collapsar model In non-star forming galaxies No supernovae Merger model

SN 2008D Shock Breakout - XRT monitoring of NGC 2770 (27 Mpc) SN 2007uy - XRT monitoring of NGC 2770 (27 Mpc) revealed extremely luminous X-ray outburst - No BAT detection (i.e., not a GRB) - UVOT detection of SN rising 90 min later - Supernova 2008D - Shock breakout. May occur for all SN 9 Jan 2008 Soderberg et al. 2008