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Astron. Astrophys. 337, 691-698 (1998)


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Archival searches for transient optical emission in the error box of the 1991 January 22 gamma-ray burst

J. Gorosabel 1 and A.J. Castro-Tirado 1, 2

1 Laboratorio de Astrofísica Espacial y Física Fundamental (LAEFF-INTA), P.O. Box 50727, E-28080 Madrid, Spain
2 Instituto de Astrofísica de Andalucía (IAA-CSIC), P.O. Box 03004, E-18080 Granada

Received 16 January 1998 / Accepted 17 June 1998

Abstract

We present here the results of a study carried out at the Harvard College Observatory Plate Collection. We examined 3995 plates covering the error box of the gamma-ray burst GRB 910122, over a time span of 90 yr (from 1889 to 1979). The total exposure time is [FORMULA] 0.55 yr. No convincing evidence of optical transient emission was found within the GRB 910122 IPN error box. However, a possible OT was found outside the GRB 910122 error box. Optical ground based observations have revealed a V[FORMULA]22.3 object consistent with the position of the new object. The colours of the object are typical of a K7/M0 star or a reddened galaxy, which could have caused the OT, but the fact that the object is far away from the GRB error box makes both events unrelated.

Key words: gamma rays: bursts

Send offprint requests to: J. Gorosabel, (jgu@laeff.esa.es)

© European Southern Observatory (ESO) 1998

Online publication: August 27, 1998

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