RXTE ASM and IPN Precise Position of BATSE Burst 5428

Astronomy and Astrophysics – Astronomy

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Scientific paper

The gamma-ray burst BATSE #5428 which occurred on 16 Apr. 1996 at 0409 UT was fortuitously observed in progress by two of the shadow cameras of the All-Sky Monitor (ASM) on the Rossi X-ray Timing Explorer (RXTE). In each camera, the burst was detected at ~ 240 +/- 13 mCrab (2 - 12 keV) averaged over the 90-s exposure. The ASM data yield crossed lines of position with a preliminary joint position of 4h 15.4m+/-0.7m, +77arcdeg 09.8arcmin +/- 1.5arcmin (J2000). Systematic errors are believed to be ≲ 1.5arcmin . This position is consistent with both the BATSE position and the Ulysses/BATSE IPN annulus. The BATSE, Ulysses, and ASM time-series data all show a double-peaked profile. No X-ray flux from this position was detected during subsequent 90-s exposures over the next 23 hours, to a 1-sigma upper limit of ~ 13 mCrab. The earliest of these exposures began 85 s after the initial BATSE burst trigger. The POSS E plate shows many stellar objects and a single galaxy at ≲ 20 mag. within the preliminary ASM error region reported here.

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