GCN Circular 40721

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
sb25061218, collecting 1.7 ks of Photon Counting (PC) mode data between T0+5.9 ks
and T0+7.7 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 J131445.9+544759):
  ==================================
    RA (J2000.0):  198.6914  =	13h 14m 45.94s
    Dec (J2000.0): +54.7999  =	+54d 47' 59.6"
    Error:	   11.2 (arcsec, radius, 90% confidence).
    Detect flag:   GOOD
    Distance:	   10.7 arcmin from the SVOM/ECLAIRs position.
    Mean rate:	   (9.8 [+3.7, -3.0])e-3 ct s^-1
    Mean flux:	   (4.8 [+1.8, -1.4])e-13 erg cm^-2 s^-1
    Peak rate:	   (9.8 [+3.7, -3.0])e-3 ct s^-1
    Peak flux:	   (4.8 [+1.8, -1.4])e-13 erg cm^-2 s^-1
    ECF:	   4.85e-11 erg cm^-2 ct^-1, assuming NH=2.15e+20 cm^-2,
		   gamma=1.50; determined from a spectral fit.
    XMM UL:	   2.1e-12 erg cm^-2 s^-1, (0.3-10 keV)
	 so the source is 10.0-sigma above this 3-sigma upper limit.
    There is no evidence for fading.
    A SIMBAD object `[VV2006] J131446.6+544804' is 6.6" away.

  Source 2 (SWIFT J131433.3+544329):
  ==================================
    RA (J2000.0):  198.6390  =	13h 14m 33.36s
    Dec (J2000.0): +54.7249  =	+54d 43' 29.6"
    Error:	   9.7 (arcsec, radius, 90% confidence).
    Detect flag:   GOOD
    Distance:	   6.2 arcmin from the SVOM/ECLAIRs position.
    Mean rate:	   (5.9 [+2.8, -2.1])e-3 ct s^-1
    Mean flux:	   (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1
    Peak rate:	   (5.9 [+2.8, -2.1])e-3 ct s^-1
    Peak flux:	   (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1
    ECF:	   1.71e-11 erg cm^-2 ct^-1, assuming NH=1.76e+22 cm^-2,
		   gamma=7.90; determined from a spectral fit.
    XMM UL:	   2.4e-12 erg cm^-2 s^-1, (0.3-10 keV)
	 so the source is 54.2-sigma above this 3-sigma upper limit.
    There is no evidence for fading.
    A SIMBAD object `SDSS J131433.74+544331.8' is 3.9" 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.

This circular is an official product of the Swift-XRT team.