TITLE: GCN CIRCULAR NUMBER: 18996 SUBJECT: GRB 160206A: Swift-XRT observations DATE: 16/02/06 23:26:02 GMT FROM: Andrea Melandri at INAF-OAB K.L. Page (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), L.M. McCauley (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the MAXI-detected burst GRB 160206A (Furuya et al. GCN Circ. 18993) in a series of observations tiled on the sky. The total exposure time is 3.7 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 1.6 ks. The data were collected between T0+46.2 ks and T0+53.5 ks, and are entirely in Photon Counting (PC) mode. Two uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below: Source 1: RA (J2000.0): 132.7319 = 08:50:55.65 Dec (J2000.0): -36.3302 = -36:19:48.5 Error: 4.1 arcsec (radius, 90% conf.) Count-rate: 0.0262 +/- 0.0060 ct s^-1 Flux: (5.8 +/- 1.3)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 2: RA (J2000.0): 132.5583 = 08:50:13.98 Dec (J2000.0): -36.0137 = -36:00:49.5 Error: 5.8 arcsec (radius, 90% conf.) Count-rate: (5.2 +/- 2.4)e-3 ct s^-1 Flux: (1.04 +/- 0.49)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) The results of the XRT-team automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/xrt_products/TILED_GRB00053. This circular is an official product of the Swift-XRT team.