A search for prompt transient emission of high energy gamma-rays /greater than or equal to 10 to the 12th eV/ from supernovae

Details A search for prompt transient emission of high energy gamma-rays /greater than or equal to 10 to the 12th eV/ from supernovae A search for prompt transient emission of high energy gamma-rays /greater than or equal to 10 to the 12th eV/ from supernovae

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..344f&link_type=abstract

Astrophysical Journal, Part 1, vol. 240, Aug. 15, 1980, p. 344-349. Research sponsored by the National Science Council of Irela

Astronomy and Astrophysics

Astronomy

3

Cosmic Rays, Gamma Ray Astronomy, Stellar Radiation, Supernovae, Radiation Detectors, Searching

Scientific paper

A cosmic-ray experiment is described which employs ground-based detection techniques at two independent stations, separated by 250 km. The objective is to search for coincident or correlated bursts of high energy gamma rays (greater than or equal to 10 to the 12th eV) over characteristic emission time scales of between 10 microsec and 1 sec. The combined results of three years of observations are presented. The search proved negative over the time scales in question and for system sensitivities approximately 5 x 10 to the -5th ergs/sq cm. Assuming that the frequency of supernovae (SN) explosions which might produce prompt gamma-ray emission is proportional to the rate of optical supernovae, rate upper limits were used to estimate the maximum possible total emission energy in prompt gamma rays from SN for the time scales in question. Over time scales of between 20 and 100 microsec this limit is 4.4 x 10 to the 48th ergs. The results are discussed in relation to the predictions by Colgate of prompt transient pulses of electromagnetic radiation from supernovae explosions together with some published results at X-ray and microwave frequencies.

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