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GBM detection of XTE J1752-223 to above 100 keV

ATEL # 2280; C.A. Wilson-Hodge (NASA/MSFC), A. Camero-Arranz (FECYT/NSSTC), G. Case (LSU), V. Chaplin, V. Connaughton (UAH) for the GBM Earth occultation team
on 4 Nov 2009; 16:58 UT
Password Certification: Colleen A. Wilson (Colleen.Wilson@nasa.gov)

Subjects: X-ray, Gamma Ray, Binaries, Black Holes

The new transient black hole candidate XTE J1752-223 (ATel. #2258; see also ATels. #2259, #2261, #2263, #2268, #2269, #2278), is also detected using the Earth occultation technique with the Gamma Ray Burst Monitor (GBM) on Fermi. We detect the source to above 100 keV, with a mean 100-300 keV flux for 2009 Oct 30 - November 2 of 740+/-120 mCrab. The transient rose from undetectable on 2009 October 24 to 560+/-55 mCrab (12-25 keV), 510+/-80 mCrab (25-50 keV), 970+/-120 mCrab (50-100 keV), and 770+/-230 mCrab (100-300 keV) on 2009 November 2. The light curve is variable, especially in the 12-25 keV band, where the flux initially rose to about 240 mCrab (2009 Oct 25-28), suddenly dropped below the detection threshold on 2009 October 29-30, and then rose again 2009 October 31 to November 2.

GBM light curve for XTE J1752-223


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R. E. Rutledge , Editor
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