Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19513307w&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #133.07; Bulletin of the American Astronomical Society, Vol. 32, p.880
Astronomy and Astrophysics
Astronomy
Scientific paper
The 3rd EGRET catalog contains 170 unidentified sources, and there is great interest in the nature of these sources. One means of determining source class is the study of flux variability on time scales of days; pulsars are believed to be stable on these time scales while blazars are known to be highly variable. In addition, previous work has demonstrated that 3EG J0241-6103 and 3EG J1837-0606 are candidates for a new gamma-ray source class. These sources near the Galactic plane display transient behavior but cannot be associated with any known blazars. Although many instances of flaring AGN have been reported, the EGRET database has not been comprehensively searched for occurrences of short-timescale ( 1 day) variability. These considerations have led us to conduct a systematic search for such short-term variability in EGRET data, covering all viewing periods through proposal cycle 4, matching the time span of the 3EG catalog. Four 3EG catalog sources are reported here to display variability on short time scales; three of them are unidentified. One (3EG J2006-2321) displays variable behavior but cannot easily be identified as a blazar.
Bertsch David L.
Bloom Steven David
Griffis N. J.
Hartman Robert C.
Kniffen Donald A.
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