JPL earth occultation analysis of the Galactic center region during flaring of 1E 1740.7-2942.

Details JPL earth occultation analysis of the Galactic center region during flaring of 1E 1740.7-2942. JPL earth occultation analysis of the Galactic center region during flaring of 1E 1740.7-2942.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.295w&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.295-298

Physics

2

Gamma Rays: Observations, Black Hole: Physics, Line: Identification, Star: Individual: 1E 1740.7-2942

Scientific paper

We present preliminary results of a search for flaring of the gamma-ray source 1E 1740.7-2942 above 300keV using the JPL-EBOP package on BATSE data. We selected two periods, 1-19 October 1991 and 19-20 September 1992, corresponding to SIGMA observations of a transient high energy feature in the spectrum of 1E 1740.7-2942 around 450keV. For the first period, we find an integrated 300-600keV flux consistent with SIGMA observation. Below 200keV, the interpretation is uncertain because of potential source confusion with BATSE. For the second period, the sensitivity of the current JPL-EBOP package does not allow us to put strong constraints on this ~ one-day long flaring although no flux variation above 300keV is observed during a 13-day period including this event with a one-day one-sigma sensitivity of ~3x10^-3^ph/cm^2^/s.

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