ASCA Observation of a Possible X-Ray Counterpart of the 1992 May 1 Gamma-Ray Burst

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Abstract
A probable X-ray counterpart of the 1992 May 1 gamma-ray burst was observed with ASCA. This burst was first observed with the 3rd interplanetary network, which consisted of BATSE, Ulysses, and PVO, and was localized to a small error box. Then, 18 days after the burst, ROSAT discovered a weak X-ray source in the error box, and later ROSAT HRI and PSPC observations determined the spectrum and refined the position. ASCA observed this source on 1995 April 10. Its 0.5–10.0 keV spectrum appears to be hard, and is heavily absorbed at low energies. The amount of absorption is consistent with the galactic hydrogen column density in this direction. This suggests that the X-ray source is quite distant, and might not be a field star or a supernova remnant in the galactic disk. Recently, IR observations at KECK found a galaxy in the error box, which seems to be consistent with the ASCA results.

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