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

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2. Observation and data analysis

An overview of the EUVE instrumentation can be found in Bowyer & Malina (1991). Table 1 displays the bursts detected by WATCH which occurred close in time to the passages of EUVE during the all sky survey phase, carried out between 1992 July and 1993 January. No near-simultaneous observations were found, with the exception of GRB 921013b. EUVE serepinditously observed the location of GRB 921013b between 12 Oct 1992 (12:25:35 UT) and 17 Oct 1992 (23:45:38 UT). There were scans of the target area beginning on 14 Oct (10:02 UT, 11-hr after the burst), but no source was seen in the field of view for the entire interval of EUVE coverage, in the 100, 200, 400, or 600 Å EUVE bandpasses. We extracted from the EUVE all-sky survey archive the 100 Å-band photon images for each sweep of the EUVE telescopes past the position of GRB 921013b. From each image we determined the maximum point-spread function (PSF)-convolved count rate. From these rates and their statistical errors, we determined 2-[FORMULA] upper limits to the observed count rates.


Table 1. WATCH GRBs close-in-time to EUVE passages.

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© European Southern Observatory (ESO) 1999

Online publication: December 22, 1998