BATSE Search for the ~540 keV Feature in the Crab Spectrum Observed by Granat-SIGMA

Details BATSE Search for the ~540 keV Feature in the Crab Spectrum Observed by Granat-SIGMA BATSE Search for the ~540 keV Feature in the Crab Spectrum Observed by Granat-SIGMA

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...559..342w&link_type=abstract

The Astrophysical Journal, Volume 559, Issue 1, pp. 342-345.

Astronomy and Astrophysics

Astronomy

2

Gamma Rays: Observations, Stars: Pulsars: Individual: Name: Crab Pulsar

Scientific paper

We report the first simultaneous observations of the γ-ray spectrum of the Crab in the energy range 25-1.7 MeV made by the BATSE and SIGMA experiments. These observations were made on 1992 March 10-11. We report specifically results of a search in the JPL BATSE Earth Occultation database for the transient high-energy feature at ~540 keV reported by Granat-SIGMA during this period. We obtain a null result for this feature on both March 10 and March 11. The time-averaged continuum spectrum in the 25 keV-MeV range for the 2 day average spectrum is consistent with a single power law, with photon index of 2.25+/-0.02. The best-fit line flux for either a narrow (0 keV FWHM) feature at 541 keV or a broad (44 keV FWHM) feature at 536 keV of the same 2 day spectrum is (-1.2+/-0.8)×10-3 and (-1.3+/-0.8)×10-3 photons cm-2 s-1, compared to (4.3+/-1.2)×10-3 and (5.1+/-1.7)×10-3 photons cm-2 s-1, respectively, reported by the SIGMA investigators. The difference of the line fluxes measured simultaneously by the BATSE and SIGMA experiments is estimated to be 3.8 σ significance for the narrow feature and 3.4 σ significance for the broad feature.

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