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Astron. Astrophys. 342, 47-48 (1999)

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1. Introduction

On 1992 October 13, 23:00:42 UT, the all-sky X-ray monitor WATCH on board the Granat satellite (Lund 1986) was triggered by a 50 s long transient high-energy event in the 8-60 keV WATCH energy range (Sazonov et al. 1998), with a peak flux [FORMULA] erg s- 1 cm-2, and fluence [FORMULA] = (3.1 [FORMULA] 0.2) [FORMULA] erg cm-2. This is the largest fluence of any of the [FORMULA] 70 bursts detected by WATCH. GRB 921013b was also detected by PHEBUS on Granat and by the Gamma-ray Burst Detector on Ulysses (Hurley et al. 1992). PHEBUS recorded a fluence of [FORMULA] erg cm-2 for a 15 s long event (Terekhov et al. 1995). The position of the burst was determined by WATCH to be R.A.(2000) = 7h50m50.4s, Dec(2000) = [FORMULA] 24' 36" ([FORMULA], [FORMULA]) with a 3[FORMULA] error radius of [FORMULA].32. The combination of the Ulysses and PHEBUS data (Barat 1998) provided an annulus that led to an improvement of the GRB error box.

Here we present the results of a search performed in the EUVE database in order to find observations close in time to the 55 events localized by the WATCH detectors on board Granat and Eureca (Sazonov et al. 1998; Brandt, Lund and Castro-Tirado 1995). A similar search for bursts detected by the Third Interplanetary Network was carried out by Hurley et al. (1995).

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© European Southern Observatory (ESO) 1999

Online publication: December 22, 1998
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