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GCN Circular 20679

GRB 170214A: Swift-XRT observations
2017-02-15T14:47:44Z (7 years ago)
Andy Beardmore at U Leicester <>
A.P. Beardmore (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri
(INAF-OAB), P. D'Avanzo (INAF-OAB), A. Cholden-Brown (PSU), S. J.
LaPorte (PSU), J.A. Kennea (PSU), S.L. Gibson (U. Leicester) and P.A.
Evans (U. Leicester) report on behalf of the Swift-XRT team:

Swift-XRT has performed follow-up observations of the
Fermi/LAT-detected burst GRB 170214A (Racusin et al. GCN Circ. 20676),
collecting 4.9 ks of Photon Counting (PC) mode data between T0+38.6 ks
and T0+65.3 ks. 

Two uncatalogued X-ray sources have been detected, however none of them
is above the RASS limit or shows definitive signs of fading. Therefore,
at the present time we cannot identify which, if any, is the afterglow.
Details of these sources are given below:

Source 1:
  RA (J2000.0):  256.34147  =  17:05:21.95
  Dec (J2000.0): -1.88746  =  -01:53:14.9
  Error: 2.4 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: 0.0131 +/- 0.0021 ct s^-1   
  Distance: 49 arcsec from Fermi/LAT position.
  Flux: (4.88 +/- 0.78)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 3:
  RA (J2000.0):  256.3873  =  17:05:32.95
  Dec (J2000.0): -2.0113  =  -02:00:40.8
  Error: 8.8 arcsec (radius, 90% conf.)
  Count-rate: (1.94 [+0.96, -0.74])e-3 ct s^-1	 
  Distance: 515 arcsec from Fermi/LAT position.

A catalogued source was also detected.

The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at

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