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Identification of a Complete Sample of Northern ROSAT All-Sky Survey X-Ray Sources. III. The Catalog
We present a catalog of optical identifications of a representativesample of northern ( delta > -9 deg) ROSAT All-Sky Survey (RASS)sources. A full identification has been carried out for a count-rate-and area-limited complete RASS subsample comprising 674 sources. Allsources are within six study areas outside the Galactic plane (| b |> 19.dg6), one area being near the north Galactic pole and one nearthe north ecliptic pole.
| Rapid follow-up ROSAT observation of GRB 940301.
The strong γ-ray burst of March 1, 1994 was imaged by COMPTEL andfound to have an identical location within the errors as a burst whichoccurred on July 4, 1993. This location coincidence had promptedspeculations on a possible single source origin for both bursts. We haveperformed a ROSAT PSPC mosaic observation within four weeks of GRB940301. The results of these observations and the comparison of theintensities of the detected sources with those detected during the ROSATall-sky-survey in September 1990 are presented. We neither find aflaring X-ray source in the April 1994 observation nor any variabilityof the X-ray sources detected in the all-sky-survey. We discuss theconsequences of our negative result on both, the possibility of thelocation coincidence being due to a repeating burst source as well asdue to two independent sources. In the former case the source couldeither be a Soft Gamma Repeater similar to SGR 1806-20 and SGR 0525-66,or a sofar unknown classical burst repeater. We conclude that aquiescent luminous X-ray source as is found for the above mentioned SoftGamma Repeaters is very unlikely to be present in the case of GRB 930704/ GRB 940301.
| Photometrie de la comete Arend-Roland.
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