HDE 249119 and its possible relation to the 1979 SEP 29 gamma-ray burst

Details HDE 249119 and its possible relation to the 1979 SEP 29 gamma-ray burst HDE 249119 and its possible relation to the 1979 SEP 29 gamma-ray burst

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258..379b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 2, p. 379-384.

Astronomy and Astrophysics

Astrophysics

9

Gamma Ray Bursts, Light (Visible Radiation), Photographic Plates, Stellar Magnitude, Variable Stars, Astronomical Observatories, Charge Coupled Devices, Radial Velocity, Solar Flares

Scientific paper

The error boxes of five gamma-ray bursts (GRBs) were examined for optical activity on archival photographic plates taken several hours before or after the GRB events. For the GRB 790929, a possible brightening was found at the edge of the error box (which is very large) on a plate taken 7.1-9.6 hours after the GRB. Two further brightenings were found at the same position on plates taken in 1986 and 1987. The position is consistent with the position of the star HDE 249119 which is normally invisible on the plates. This star was also observed on more sensitive plates but no further brightenings were revealed. The reality of the three brightenings, which are all relatively faint (below 1 mag above the plate limit), is discussed. If they are real, it implies that HDE 249119, believed to be a normal F5 V star, exhibits flares with amplitude of about 1.5 mag, assuming a duration of several hours. The average interval between flares is 1-5 mo. If the 1979 brightening is related to the GRB, the ratio of the total gamma-ray to optical energy can be roughly estimated at about 1, and the total radiated energy was of order 10 exp 36 - 10 exp 37 ergs. To confirm the peculiar nature of HDE 249119, further observations of this star are needed.

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