Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9671468g&link_type=abstract
Technical Report, Bundesministerium für Forschung und Technologie Bonn, Germany
Physics
Gamma Ray Observatory, Gamma Ray Bursts, Time Dependence, Correlation, International Cooperation
Scientific paper
The main scientific aim of the present GRO-proposal (Search for time-correlated optical counterparts of gamma-ray bursters (FKZ 50 OR 9104 3)) was the identification and examination of optical photographic observations (plates) which contain the error box of gamma-ray burst, and were exposed over a time span (typically 40 min) which includes the gamma-ray burst event (typically 30 sec). During the time interval 8/1991-3/1994 we received the trigger times of 449 gamma-ray bursts. For 267 of these bursts we have finished the investigations at the nine collaborating observatories (Sonneberg, Tautenburg, Hamburg, Ondrejov, Calar Alto, Moscow, Crimea, Odessa and Duschanbe). We found simultaneous photographic plates for 31 of the 267 gamma-ray bursts containing the location (including an error box of 6-8 degrees) of the burst. We could not find an optical flash or brightening of a known optical object on any of these plates. The typical limiting magnitude for an optical flash of assumed duration of 1 sec is about 3-4 mag, i.e. the simultaneous optical emission of a gamma-ray burst (erg/cm2/s) is lower than typical (Fgamma/Fopt)-1greater than or = 2. As becomes clear from the above numbers, we have neither finished the scientific project (BATSE is continuing to detect one burst per day), nor ever fixed the number of collaborating observatories. Thus, we intend to continue this world-wide exceptional work in order to have at least a maximal possible constraint on the optical emission of a gamma-ray burst if the negative results continue to occur.
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