The optical content of the 1979 April 6 gamma ray burst error box

Details The optical content of the 1979 April 6 gamma ray burst error box The optical content of the 1979 April 6 gamma ray burst error box

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..201m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 1, April 1985, p. 201-205. Research supported by the Centre National

Physics

Optics

26

Astronomical Photography, Gamma Ray Bursts, Optical Properties, Cassegrain Optics, Charge Coupled Devices, Error Analysis, Spaceborne Astronomy

Scientific paper

A complete analysis is presented of the deepest available CCD composite images of the April 6, 1979 gamma-ray burst error box in red (R less than 24.1), and white light (equivalent to R less than 25.0). Of the nine objects contained in the error box, one is definitely stellar, lies in the middle of the box and has R = 21.80 and R-I = 1.60, while a fainter one may also be stellar. Six others appear extended and are faint galaxies, while a seventh may also be extended. None of the objects within or near the error box is found to be variable on time scales from hours to months. Stellar-like objects in this region for which color information can be derived are very likely disk M dwarfs or Population II main sequence stars. If the April 6, 1979 quiescent optical counterpart is similar to that found by Pedersen et al. (1983) for the November 19, 1978 event, comparison of the gamma-ray characteristics of both events suggests the April 6, 1979 object could be fainter than the present optical detection threshold.

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