Observations of Cygnus X-3 near 100 TeV using the low elevation atmospheric Cherenkov technique.
Abstract
The low elevation angle technique suggested by Somers and Elbert is used to observe the norhtern source Cygnus X-3 at about 15 deg elevation. A large gamma-ray burst was seen from 1354 to 1409 UT on July 27, 1989. The detected flux was about (7 + or - 2) x 10 to the -12th/sq cm/s above 100 TeV. A pulsar period search was carried out on data from 16 nights during and after the burst. The same period, 12.5953 + or - 0.0005 ms, was observed on consecutive nights in the phase window 0.55-0.58 at the chance probability level of about 0.001 after allowing for sampling.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1990
- Bibcode:
- 1990A&A...237L...5G
- Keywords:
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- Cerenkov Radiation;
- Gamma Ray Astronomy;
- Gamma Ray Bursts;
- Pulsars;
- X Ray Binaries;
- Emission Spectra;
- Gamma Ray Telescopes;
- Radio Waves;
- Astronomy