TITLE: GCN CIRCULAR NUMBER: 41765 SUBJECT: EP#01709240653: Swift-XRT observations DATE: 25/09/09 16:05:43 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 Einstein Probe/WXT-detected source EP#01709240653, collecting 1.8 ks of Photon Counting (PC) mode data between T0+859 s and T0+6.8 ks after the trigger. We have detected 2 sources. These have been automatically classified as follows: * 0 likely counterparts * 0 candidate counterparts * 2 uncatalogued X-ray sources * 0 known X-ray sources Uncatalogued X-ray sources -------------------------- Source 1 (SWIFT J194954.4-572931): ================================== RA (J2000.0): 297.4769 = 19 49 54.46 Dec (J2000.0): -57.4921 = -57 29 31.6 Error: 5.7 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 1.6 arcmin from the Einstein Probe/WXT position. Mean rate: 0.0334 [+0.0053, -0.0052] ct s^-1 Mean flux: (8.9 +/- 1.4)e-13 erg cm^-2 s^-1 Peak rate: 0.085 +/- 0.025 ct s^-1 Peak flux: (2.25 +/- 0.66)e-12 erg cm^-2 s^-1 ECF: 2.65e-11 erg cm^-2 ct^-1 assuming NH=4.43e+20 cm^-2, gamma=2.38 determined from a spectral fit. XMM UL: 2.1e-12 erg cm^-2 s^-1, (0.3-10 keV) so the source is 0.3-sigma above this 3-sigma upper limit. The source may be fading, at the 1.9-sigma level. There are 2 2MASS objects within the source's 3-sigma error radius. Source 5 (SWIFT J194951.3-573147): ================================== RA (J2000.0): 297.4638 = 19 49 51.31 Dec (J2000.0): -57.5299 = -57 31 47.6 Error: 6.8 (arcsec, radius, 90% confidence). Detect flag: POOR Distance: 1.8 arcmin from the Einstein Probe/WXT position. Mean rate: (-1.0 +/- -1.0)e0 ct s^-1 Mean flux: (-4.3 +/- -4.3)e-11 erg cm^-2 s^-1 Peak rate: (6.0 [+4.5, -3.2])e-3 ct s^-1 Peak flux: (2.6 [+1.9, -1.4])e-13 erg cm^-2 s^-1 XMM UL: 1.9e-12 erg cm^-2 s^-1, (0.3-10 keV) so the source is not above this 3-sigma upper limit. There is no evidence for fading. 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/EP/EP_FIELD00071. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/41765. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...