Upper limits to the high-energy gamma-ray and hard X-ray flux from SN 1987A on day 55
Open Access
- 1 September 1988
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 234 (1) , 73P-77P
- https://doi.org/10.1093/mnras/234.1.73p
Abstract
A balloon-borne experiment was carried out on 1987 April 19 from Alice Springs, Australia to detect high-energy gamma-rays and hard X-rays from the supernova SN 1987A in the Large Magellanic Cloud. An optical spark chamber for measuring the high-energy gamma-rays and a multiwire proportional counter for measuring the hard X-rays shared a common balloon platform. No positive emission was observed by either detector. The gamma-ray upper limit obtained indicates that either the expanding supernova shell was opaque to gamma-rays at the time of the flight, or that the supernova cosmic ray luminosity was less than ∼1040 erg s−1. The X-ray upper limit obtained confirms the opacity of the shell to Comptonized hard X-rays.Keywords
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