[vsnet-alert 1161] X-ray Position for Gamma Ray Burst

[Ron Remillard <rr@space.mit.edu>]

Alert for Northern Optical Astronomers:

X-ray Position for BATSE GRB #6350

The RXTE All Sky Monitor has detected the gamma ray burst reported as
BATSE trigger #6350 (burst at 1997 August 28, 17:44:36.8 UT).  The
burst was detected by ASM camera #1 with a mean flux of 756 mCrab
(2-12 Kev) averaged over the 40 s in which the burst was seen before
the camera was rotated. Ninety seconds later, ASM camera #2 scanned
over the source and determined a crossing line of position and an
average flux of 238 mCrab, declining in an exponential-like fashion
with a 30 s time constant. The X-ray emission began roughly
simultaneously with the gamma ray trigger, but was detectable with the
ASM over at least 160 s. The combined camera detections yield an
X-ray position (J2000) of 18h 08m 29s +59 18' with uncertainty 
(1 sigma) of +/- 3.2' in RA. and +- 1.2' in Dec. Optical observations
are urgently needed.

R. Remillard, A. Wood, D. Smith, and A. Levine (MIT)

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