TITLE: GCN CIRCULAR NUMBER: 15721 SUBJECT: GRB 140110A: Swift XRT observations DATE: 14/01/11 12:03:01 GMT FROM: Alessandro Maselli at INAF/IASF Palermo A. Maselli (INAF-IASFPA), S. Campana (INAF-OAB), D. Malesani (DARK/NBI) and P. A. Evans (U. Leicester) report on behalf of the Swift team: Swift-XRT has observed the error circle of the Fermi/LAT GRB 140110A (Bissaldi et al., GCN 15714), also detected by Fermi/GBM (von Kienlin & Connaughton, GCN 15716), in a series of observations tiled on the sky. The total exposure time is 12.8 ks spread over 7 fields; the maximum exposure within the sky observed was 3.9 ks. The observations started 28.4 ks after the Fermi/LAT trigger. Within these data there are two objects (source #1 and source #3) which are in the 1RXS catalogue and five sources which are not catalogued in X-rays. At the present time we cannot be sure which of these, if any, is the afterglow. However, we note that the light curve of source #2, with a mean count rate of (1.23 ± 0.27) x 10^-2 ct s^-1, suggests evidence of decay. Source details: Source 1 RA: 28.58425 = 01h 54m 20.22s (J2000) Dec: -36.49342 = -36d 29' 36.3" (J2000) Err: 4.4" (radius, 90% confidence) Exposure time: 1.7 ks Online products: http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_1.php Source 2 RA: 28.53253 = 01h 54m 7.81s (J2000) Dec: -36.12000 = -36d 07' 12.0" (J2000) Err: 5.4" (radius, 90% confidence) Exposure time: 2.6 ks Online products: http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_2.php Source 3 RA: 28.63188 = 01h 54m 31.65s (J2000) Dec: -36.70189 = -36d 42' 06.8" (J2000) Err: 5.4" (radius, 90% confidence) Exposure time: 1.5 ks Online products: http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_3.php Source 4 RA: 29.24134 = 01h 56m 57.92s (J2000) Dec: -36.06453 = -36d 03' 52.3" (J2000) Err: 6.2" (radius, 90% confidence) Exposure time: 1.6 ks Online products: http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_4.php Source 5 RA: 28.36418 = 01h 53m 27.40s (J2000) Dec: -36.32146 = -36d 19' 17.3" (J2000) Err: 5.7" (radius, 90% confidence) Exposure time: 1.7 ks Online products: http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_5.php Source 6 RA: 28.46195 = 01h 53m 50.87s (J2000) Dec: -36.04399 = -36d 02' 38.4" (J2000) Err: 6.2" (radius, 90% confidence) Exposure time: 1.0 ks Online products: http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_6.php Source 7 RA: 28.94482 = 01h 55m 46.76s (J2000) Dec: -36.43079 = -36d 25' 50.8" (J2000) Err: 6.2" (radius, 90% confidence) Exposure time: 2.7 ks Online products: http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_7.php This circular is an official product of the Swift-XRT team.