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GRO J1008-57

Abstract:

MT Stollberg, MH Finger, RB Wilson, BA Harmon, BC Rubin, NS Zhang, and GJ Fishman report for the Compton Gamma Ray Observatory BATSE team:" Hard x-ray pulsations in the energy range 20-120 keV are being detected from a previously uncatalogued source in the Carina-Vela region. The source location, determined from the observed times of Earth occultation, is centered at RA= 10h08m, Decl.=-57.5 deg (equinox 2000.0). The estimated 1-sigma errors are bounded by a box with the following corners: RA= 10h09m. 5, Decl.=-57 24'; 10h03m. 5,-56 24'; 10h07m. 0,-57 30'; 10h12m. 5,-58 42'. The pulse period on July 19 was 93.587+/-0.005 s, corrected to the solar system barycenter. The present outburst was first detected on July 14. The pulsed flux in the range 20-50 keV increased from a detection threshold of about 50 mCrab to about 1.1 Crab (pulsed) on July 18, and this flux has continued to increase …