Multi-Wavelength Observations of May 1 1992 Gamma-Ray Burst

Astronomy and Astrophysics – Astronomy

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The gamma-ray burst of May 1 1992 was observed by three detectors in the interplanetary network: GRB/Ulysses, BATSE/Compton GRO, and PVO. The position of the burst was quickly determined to a small hexagonal error box (<1.6 arcmin(2) ) by triangulation. Quick follow-up observations of the gamma-ray burst position in X-ray, optical, and radio wavelengths were carried out. We have found a weak X-ray source inside the burst error box, and two radio sources outside the error box. Those two radio sources are in alignment with the X-ray source, and are 2.1 arcmin and 4.7 arcmin away from the X-ray source. In the X-ray source error box, we have found 25 optical objects down to 23rd magnitude. The X-ray source spectrum is not well determined, but the ratio of hard (0.4-2.4 keV) to soft (0.07-0.4 keV) counts appears to be consistent with interstellar absorption. We discuss the possible association between the burster, the X-ray, and the radio sources.

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