Search for TeV gamma rays from Geminga

We report here on the search for pulsed TeV gamma rays in the archival data of 1984-1985 on Geminga obtained by us with the Atmospheric Cerenkov Technique at Ootacamund, India. The data taken at two sites amounting to a total of about 30 hours were analyzed to look for the recently discovered period...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 1993, Vol.267 (1), p.L5-L7
Main Authors: VISHWANATH, P. R, SATHYANARAYANA, G. P, RAMANAMURTHY, P. V, BHAT, P. N
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Gamma-ray sources
gamma-ray bursts
Stellar systems. Galactic and extragalactic objects and systems. The universe
Unidentified sources and radiation outside the solar system
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Summary:We report here on the search for pulsed TeV gamma rays in the archival data of 1984-1985 on Geminga obtained by us with the Atmospheric Cerenkov Technique at Ootacamund, India. The data taken at two sites amounting to a total of about 30 hours were analyzed to look for the recently discovered period of 237 msec. Two peaks were seen in the overall phasogram with a separation of 0.5 in phase, with the absolute phases of the peaks coinciding with those of the peaks in COS - B data. The Poisson probability for the peaks arising out of fluctuations is 0.1 percent. One night of simultaneous runs at the two sites has revealed a few minutes of simultaneous short time activity.
ISSN:0004-6361
1432-0746