Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC

Astronomy and Astrophysics – Astronomy

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X-Ray, Gamma-Ray Burst, Transient

Scientific paper

MAXI/GSC observed the position of GRB 111215A (swift trigger=509717, Oates et al. GCN #12681) at 13:12 and 14:44 on December 5, 2011 (UT), 52 min before and 40 min after the trigger time. The source was marginally detected as follows: Time 2-4 keV 4-10 keV 13:12 4 +- 7 mCrab 52 +- 19 mCrab 14:44 16 +- 10 mCrab 41 +- 19 mCrab (uncertainties are 1-sigma statistical errors) If this detections are true it implies that the emission of GRB 111215A lasted for more than 1.5 hours.

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