TITLE: GCN CIRCULAR NUMBER: 43630 SUBJECT: GRB 260206A: Swift-XRT observations DATE: 26/02/07 14:08:50 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> S. Lanava (PSU), S. Dichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the MAXI-detected burst GRB 260206A (Negoro et al. GCN Circ. 43624) in a series of observations tiled on the sky. The total exposure time is 1.6 ks, distributed over 5 tiles; the maximum exposure at a single sky location in the tiling was 787 s. The data were collected between T0+32.1 ks and T0+38.5 ks, and are entirely in Photon Counting (PC) mode. One uncatalogued X-ray source has been detected, with a rank of "reasonable" (i.e. a ~2 sigma detection); however, it is neither above historical upper limits nor shows evidence of fading. Therefore, at the present time we cannot say whether or not it is the afterglow. The source details are: Source 3: RA (J2000.0): 78.4839 = 05h 13m 56.13s Dec (J2000.0): -40.5311 = -40d 31' 51.8" Error: 6.7 arcsec (radius, 90% conf.) Count-rate: 0.0117 [+0.0077, -0.0055] ct s^-1 Distance: 523 arcsec from MAXI position. Two catalogued sources were also detected, including the LMXB 4U 0513-40 noted by Negoro et al. (GCN Circ. 43624); as well two 'poor' sources (~1 sigma detections). The results of the XRT-team automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00142. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/43630. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...