Gamma-ray bursts in the All-Sky Monitor on RXTE

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Gamma-Ray Sources, Gamma-Ray Bursts, X-Ray Sources, X-Ray Bursts, Gamma-Ray, X-Ray

Scientific paper

The All-Sky Monitor (ASM) on RXTE can provide useful scientific data to the astrophysics community for the investigation of gamma-ray bursts. We are developing two complementary methods by which the ASM searches for the X-ray counterparts to gamma-ray bursts: (1) we determine whether or not a BATSE location as delivered through the GCN is scanned by the ASM at or shortly after the BATSE trigger time, and (2) we search for transient events in ASM time-series data that correspond to new sources in ASM position histogram data. On 1997 August 15, we were able to determine an arcminute position within 12 h of trigger. On 1997 August 28, we released a position in 2 h, enabling the RXTE/PCA, 4-m Herschel telescope, and the VLA to be on target within 4 h of the burst. We present position and timing information on GRB970815 and GRB970828, comparing the ASM and BATSE data.

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