Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..499h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 2, p. 499-506
Astronomy and Astrophysics
Astrophysics
9
Aberration, Astronomical Photography, Data Reduction, Gamma Ray Bursts, Optical Transition, Photographic Plates, Comparison, Distortion
Scientific paper
We have analyzed in detail the image of optical transient OT 1928 suggested to be an optical flashing counterpart of the gamma ray burst source GRBS 781119. Different investigations of this image have however yielded very different and controversial results. We have therefore analyzed the image in detail together with a number of comparison stars from the discovery plate and comparison plates taken under analogous conditions. We have found by means of image distortion analysis that the image was caused by a real optical flash. The image was also found not to have obviously different density of developed grains on the glass/emulsion boundary if compared with the stars with similar total density of developed grains. All observed parameters and properties of the OT image can be explained by the fact that the event was caused by extremely colored light. For other two Schaefer's OT candidates, no similar conclusions could be obtained due to the faintness of these images.
Borovicka Jiri
Hudec Rene
Pravec Petr
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