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Title:
Search for 10 to the 15th eV gamma-rays from the Crab pulsar and surrounding regions
Authors:
Boone, J.; Cady, R.; Cassiday, G. L.; Elbert, J. W.; Loh, E. C.; Sokolsky, P.; Steck, D.; Wasserbaech, S.
Affiliation:
AA(California Polytechnic State University, San Luis Obispo, CA; Utah, University, Salt Lake City, UT), AB(Utah, University, Salt Lake City, UT), AC(Utah, University, Salt Lake City, UT), AD(Utah, University, Salt Lake City, UT), AE(Utah, University, Salt Lake City, UT), AF(Utah, University, Salt Lake City, UT), AG(Utah, University, Salt Lake City, UT), AH(Utah, University, Salt Lake City, UT)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 264-268. (ApJ Homepage)
Publication Date:
10/1984
Category:
Space Radiation
Origin:
STI
NASA/STI Keywords:
Crab Nebula, Gamma Ray Astronomy, Pulsars, Cerenkov Radiation, Cosmic Ray Showers, Electromagnetic Measurement, Maxima, Northern Sky
DOI:
10.1086/162501
Bibliographic Code:
1984ApJ...285..264B

Abstract

During 1980 December and 1981 February, atmospheric Cerenkov light flashes were observed in a broad region of the sky including the Crab pulsar. The 1981 February data gave a flux upper limit of 5.3 x 10 to the 13th/sq cm s for 10 to the 15th eV gamma-rays within 3.5 deg of the Crab pulsar. Comparable limits were set over a declination band of 0-70 deg and a right-ascension interval from approximately 0 to 13th. A weak (3.1 sigma) excess from the Crab vicinity was detected on 1980 December 9. The excess may be due to a variable flux component that sometimes exceeds 2 x 10 to the -17th/sq cm s above 10 to the 15th eV.

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