Observations of the Crab pulsar and nebula by the EGRET telescope on the Compton Gamma-Ray Observatory

Details Observations of the Crab pulsar and nebula by the EGRET telescope on the Compton Gamma-Ray Observatory Observations of the Crab pulsar and nebula by the EGRET telescope on the Compton Gamma-Ray Observatory

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..697n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 2, p. 697-704.

Astronomy and Astrophysics

Astronomy

154

Crab Nebula, Gamma Ray Astronomy, Gamma Ray Observatory, Gamma Ray Telescopes, Pulsars, Light Curve, Spaceborne Astronomy

Scientific paper

The Crab pulsar and nebula were observed three times in 1991 April to June by the Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma-Ray Observatory (CGRO): April 23 to May 7, May 16 to 30, and June 8 to 15. The results of analysis of the gamma-ray emission in the energy range from 50 MeV to more than 10 GeV are reported. The observed gamma-ray light curve exhibits two peaks separated in phase by 0.40 +/- 0.02, consistent with previous observations. The total pulsed emission from the Crab pulsar is found to be well represented by a power-law spectrum, softer than the spectrum measured by COS B (Clear et al., 1987). The interpulse emission has a harder spectrum than either of the pulses. The evidence for pulsed emission above 5 GeV in the EGRET data is not conclusive. Unpulsed emission in the energy range 50 MeV to 5 GeV was detected, with an indication of a hardening of the unpulsed spectrum above about 1 GeV. There was a significant change in the light curve over the 2 months of these observations, although the shape of the spectrum remained constant.

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