TITLE: GCN CIRCULAR NUMBER: 43043 SUBJECT: GRB 251208D: Swift-XRT observations DATE: 25/12/09 02:01:30 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> P.A. Evans (U. Leicester), J.A. Kennea (PSU), E. Ambrosi (INAF-IASFPA) , A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), R. Brivio (INAF-OAB), D.N. Burrows (PSU), S. Campana (INAF-OAB), M. Capalbi (INAF-OAR), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), M. Ferro (INAF-OAB), A. Melandri (INAF-OAR), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Perri (SSDC & INAF-OAR), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB), M.A. Williams (PSU) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the SVOM/ECLAIRs-detected source sb25120806 (GCN 43032), collecting 2.4 ks of Photon Counting (PC) mode data between T0+5.2 ks and T0+11 ks after the trigger. We have detected 2 sources. These have been automatically classified as follows: * 0 likely counterparts * 0 candidate counterparts * 1 uncatalogued X-ray source * 1 known X-ray source Uncatalogued X-ray sources -------------------------- Source 2 (SWIFT J223038.6-003107): ================================== RA (J2000.0): 337.6610 = 22 30 38.64 Dec (J2000.0): -0.5186 = -00 31 07.0 Error: 5.8 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 10.7 arcmin from the SVOM/ECLAIRs position. Mean rate: (4.6 [+2.2, -1.7])e-3 ct s^-1 Mean flux: (4.6 [+2.2, -1.7])e-13 erg cm^-2 s^-1 Peak rate: (4.6 [+2.2, -1.7])e-3 ct s^-1 Peak flux: (4.6 [+2.2, -1.7])e-13 erg cm^-2 s^-1 ECF: 1.02e-10 erg cm^-2 ct^-1 assuming NH=3.34e+21 cm^-2, gamma=0.47 determined from a spectral fit. RASS UL: 1.6e-01 ct s^-1 (converted to XRT; 0.3-10 keV) so the source is not above this 3-sigma upper limit. There is no evidence for fading. A SIMBAD object `SDSS J223038.66-003108.3' is 1.2" away. Known X-ray sources ------------------- Source 1 (SWIFT J222951.0-001338): ================================== RA (J2000.0): 337.4626 = 22 29 51.02 Dec (J2000.0): -0.2273 = -00 13 38.3 Error: 5.2 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 10.8 arcmin from the SVOM/ECLAIRs position. Mean rate: (5.6 [+2.4, -1.9])e-3 ct s^-1 Mean flux: (2.41 [+1.05, -0.81])e-13 erg cm^-2 s^-1 Peak rate: (5.6 [+2.4, -1.9])e-3 ct s^-1 Peak flux: (2.41 [+1.05, -0.81])e-13 erg cm^-2 s^-1 This matches a catalogued X-ray source 4XMM J222950.9-001339 in the XMM-NEWTON/XMMSSC catalogue. Details: Separation: 2.0" from the XRT source Cat Rate: 5.9e-02 +/- 8.2e-03 ct s^-1 Cat Flux: 6.0e-13 +/- 8.3e-14 erg cm^-2 s^-1 (0.3-10 keV) so the source is not above the catalogued flux. There is no evidence for fading. A SIMBAD object `TYC 5226-156-1' is 1" away. There is 1 2MASS object within the source's 3-sigma error radius. All fluxes are 0.3-10 keV, observed. For all flux conversions and comparisons with catalogues and upper limits from other missions, we assumed a power-law spectrum with NH=3x10^20 cm^-2 and photon index (Gamma)=1.7 unless otherwise stated. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/SVOM/SVOM_FIELD00056. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/43043. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...