Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.3908b&link_type=abstract
American Astronomical Society, 190th AAS Meeting, #39.08; Bulletin of the American Astronomical Society, Vol. 29, p.830
Astronomy and Astrophysics
Astronomy
Scientific paper
Previous studies of blazars and unidentified objects observed by EGRET have shown strong evidence for variability over a timescale of months and years. In addition, several extraordinary blazars are known to vary in gamma-rays over several days, and possibly within a day. For the first time, we are conducting a systematic search for short timescale variability over the entire EGRET database available for general public use. This paper will focus on the first results for blazars and high-galactic latitude unidentified sources. A preliminary analysis of the EGRET gamma-ray data from 30 viewing periods shows that several sources may be variable on short timescales. The best case can be made for the BL Lac object 0521-365, which appears to have had a 1-2 day flare during July 1994. The quasar PKS 0208-512 and the unidentified object 2EG 1835+592 also display possible varibility on 2 day timescales.
Bloom Steven David
Hartman Robert C.
Thompson Daniel J.
von Montigny C.
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