Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..693g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 2, p. 693-697
Astronomy and Astrophysics
Astrophysics
4
Astrophysics, Gamma Ray Bursts, Imagery, Imaging Techniques, Photographic Plates, Data Processing, Data Reduction, Microscopy, Optical Reflection
Scientific paper
With the knowledge of distinct differences between real stellar images and typical emulsion defects on archival astronomical plates we have investigated the object discovered by Moskalenko et al. (1989) on two simultaneously exposed Odessa Observatory plates. We conclude that the object on the blue plate is an emulsion defect, and that the object on the V plate is a grain cluster which is accidentally located on the same projected sky location as the defect on the B plate. Additionally, we have re-analyzed two objects found on plates from 1963 September 15 and 1965 September 24, respectively. The 1963 object is found to be a plate defect whereas the 1965 object does not show hints for a defect nature. Finally, we re-estimate the optical flash rate from gamma-ray bursters based on the investigation of the ukrainian and tadzhikistan plate collections.
Greiner Jochen
Moskalenko E. I.
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