Observations of Cygnus X-3 near 100 TeV using the low elevation atmospheric Cherenkov technique

Details Observations of Cygnus X-3 near 100 TeV using the low elevation atmospheric Cherenkov technique Observations of Cygnus X-3 near 100 TeV using the low elevation atmospheric Cherenkov technique

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237l...5g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 2, Oct. 1990, p. L5-L8. Research supported by the Australian Research

Astronomy and Astrophysics

Astronomy

16

Cerenkov Radiation, Gamma Ray Astronomy, Gamma Ray Bursts, Pulsars, X Ray Binaries, Emission Spectra, Gamma Ray Telescopes, Radio Waves

Scientific paper

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.

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