{
  "bibcode": "2025GCN.40721....1E",
  "eventId": "sb25061218",
  "circularId": 40721,
  "submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
  "createdOn": 1749830351495,
  "body": "P.A. Evans (U. Leicester), J.A. Kennea (PSU), E. Ambrosi  (INAF-IASFPA) , A.P.\nBeardmore (U. Leicester), M.G. Bernardini (INAF-OAB), R. Brivio (INAF-OAB), D.N.\nBurrows (PSU), S. Campana (INAF-OAB), M. Capalbi (INAF-OAR), A. D'Ai (INAF-IASFPA),\nP. D'Avanzo (INAF-OAB), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), M. Ferro\n(INAF-OAB), A. Melandri (INAF-OAR), J.P. Osborne (U. Leicester), K.L. Page (U.\nLeicester), M. Perri (SSDC & INAF-OAR), C. Salvaggio (INAF-OAB), T. Sbarrato\n(INAF-OAB), B. Sbarufatti (INAF-OAB), M.A. Williams (PSU) report on behalf of the\nSwift-XRT team:\n\nSwift-XRT has performed follow-up observations of the SVOM/ECLAIRs-detected source\nsb25061218, collecting 1.7 ks of Photon Counting (PC) mode data between T0+5.9 ks\nand T0+7.7 ks after the trigger. We have detected 2 sources. These have been\nautomatically classified as follows:\n  * 0 likely counterparts\n  * 0 candidate counterparts\n  * 2 uncatalogued X-ray sources\n  * 0 known X-ray sources\n\nUncatalogued X-ray sources\n--------------------------\n\n  Source 1 (SWIFT J131445.9+544759):\n  ==================================\n    RA (J2000.0):  198.6914  =\t13h 14m 45.94s\n    Dec (J2000.0): +54.7999  =\t+54d 47' 59.6\"\n    Error:\t   11.2 (arcsec, radius, 90% confidence).\n    Detect flag:   GOOD\n    Distance:\t   10.7 arcmin from the SVOM/ECLAIRs position.\n    Mean rate:\t   (9.8 [+3.7, -3.0])e-3 ct s^-1\n    Mean flux:\t   (4.8 [+1.8, -1.4])e-13 erg cm^-2 s^-1\n    Peak rate:\t   (9.8 [+3.7, -3.0])e-3 ct s^-1\n    Peak flux:\t   (4.8 [+1.8, -1.4])e-13 erg cm^-2 s^-1\n    ECF:\t   4.85e-11 erg cm^-2 ct^-1, assuming NH=2.15e+20 cm^-2,\n\t\t   gamma=1.50; determined from a spectral fit.\n    XMM UL:\t   2.1e-12 erg cm^-2 s^-1, (0.3-10 keV)\n\t so the source is 10.0-sigma above this 3-sigma upper limit.\n    There is no evidence for fading.\n    A SIMBAD object `[VV2006] J131446.6+544804' is 6.6\" away.\n\n  Source 2 (SWIFT J131433.3+544329):\n  ==================================\n    RA (J2000.0):  198.6390  =\t13h 14m 33.36s\n    Dec (J2000.0): +54.7249  =\t+54d 43' 29.6\"\n    Error:\t   9.7 (arcsec, radius, 90% confidence).\n    Detect flag:   GOOD\n    Distance:\t   6.2 arcmin from the SVOM/ECLAIRs position.\n    Mean rate:\t   (5.9 [+2.8, -2.1])e-3 ct s^-1\n    Mean flux:\t   (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1\n    Peak rate:\t   (5.9 [+2.8, -2.1])e-3 ct s^-1\n    Peak flux:\t   (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1\n    ECF:\t   1.71e-11 erg cm^-2 ct^-1, assuming NH=1.76e+22 cm^-2,\n\t\t   gamma=7.90; determined from a spectral fit.\n    XMM UL:\t   2.4e-12 erg cm^-2 s^-1, (0.3-10 keV)\n\t so the source is 54.2-sigma above this 3-sigma upper limit.\n    There is no evidence for fading.\n    A SIMBAD object `SDSS J131433.74+544331.8' is 3.9\" away.\n    There is 1 2MASS object within the source's 3-sigma error radius.\n\nAll fluxes are 0.3-10 keV, observed. For all flux conversions and comparisons with\ncatalogues and upper limits  from other missions, we assumed a power-law spectrum\nwith NH=3x10^20 cm^-2 and photon index (Gamma)=1.7 unless otherwise stated.\n\nThe results of the XRT-team automatic analysis of the XRT observations, including a\nposition-specific upper limit calculator, are available at\nhttps://www.swift.ac.uk/SVOM.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n",
  "submittedHow": "email",
  "subject": "sb25061218: Swift-XRT observations"
}