Rapid follow-up ROSAT obsevation of GRB 940301

The strong #gamma#-ray burst of March 1, 1994 was imaged by COMPTEL and found to have an identical location within the errors as a burst which occurred on July 4, 1993. This location coincidence had prompted speculations on a possible single source origin for both bursts. We have performed a ROSAT PSPC mosaic observation within four weeks of GRB 940301. The results of these observations and the comparison of the intensities of the detected sources with those detected during the ROSAT all-sky-survey in September 1990 are presented. We neither find a flaring X-ray source in the April 1994 observation nor any variability of the X-ray soruces detected in the all-sky-survey. We discuss the consequences of our negative result on both, the possibility of the location coincidence being due to a repeating burst source as well as due to two independent sources. In the former case the source could either be a Soft Gamma Repeater similar to SGR 1806-20 and SGR 0525-66, or a sofar unknown classical burst repeater. We conclude that a quiescent luminous X-ray source as is found for the above mentioned Soft Gamma Repeaters is very unlikely to be present in the case of GRB 930704 / GBR 940301. (orig.)Available from TIB Hannover: RN 9303(366) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

The HUS solar flare and cosmic gamma-ray burst detector aboard the Ulysses spacecraft

SIGLEAvailable from Max-Planck-Institut fuer Physik und Astrophysik, Garching (DE). Inst. fuer Extraterrestrische Physik / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

X-ray observations of gamma-ray burst sources

SIGLEAvailable from Max-Planck-Institut fuer Physik und Astrophysik, Garching (DE). Inst. fuer Extraterrestrische Physik / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

The high energy spectrum of the 1983, August 1b gamma-ray burst

SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Constraints on the optical counterpart of GBS0526-66

Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman