Search for TeV gamma rays from Geminga

Details Search for TeV gamma rays from Geminga Search for TeV gamma rays from Geminga

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267l...5v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. L5-L7.

Astronomy and Astrophysics

Astronomy

25

Cerenkov Counters, Cos-B Satellite, Gamma Ray Astronomy, X Ray Sources, Gamma Ray Observatory, Poisson Equation

Scientific paper

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.

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