GCN Circular 11399
P.A. Evans (U. Leicester) and H. A. Krimm (CRESST/GSFC/USRA), report on behalf of the Swift-XRT team: We have analysed 5.6 ks of XRT data for GRB 101112A (Gotz et al. GCN Circ. 11396), from 6215 s to 18.4 ks after the INTEGRAL trigger. The data are entirely in Photon Counting (PC) mode. We find an uncatalogued, fading point source at RA, Dec=292.2295, 39.3531 which is equivalent to: RA(J2000.0): 19h 28m 55.08s Dec (J2000.0): +39d 21' 11.0" with an estimated uncertainty of 4 arcsec (radius, 90% confidence). This position is 38 arcsec from the INTEGRAL position, and 2.4 arcsec from the optical afterglow of Guidorzi et al (GCN Circ 11397), in agreement with both of these positions. The X-ray light curve can be modelled with a power-law decay with a decay index of alpha=0.9 (+/-0.6). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.2 (+/-0.4). The best-fitting absorption column is 2.0 (+1.2, -0.7) x 10^21 cm^-2, consistent with the Galactic value of 1.2 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (5.9 x 10^-11) erg cm^-2 count^-1. If the light curve continues to decay with a power-law decay index of 0.9, the count rate at T+24 hours will be 3.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.4 x 10^-13 (2.2 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020149. This circular is an official product of the Swift-XRT team.