GCN Circular 15721

A. Maselli (INAF-IASFPA), S. Campana (INAF-OAB), D. Malesani (DARK/NBI) 
and P. A. Evans (U. Leicester) report on behalf of the Swift team:

Swift-XRT has observed the error circle of the Fermi/LAT GRB 140110A 
(Bissaldi et al., GCN 15714
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 ), also detected by Fermi/GBM (von Kienlin & 
Connaughton, GCN 15716
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 ), in a series of observations tiled on the sky. 
The total exposure time is 12.8 ks spread over 7 fields; the maximum 
exposure within the sky observed was 3.9 ks. The observations started 
28.4 ks after the Fermi/LAT trigger. Within these data there are two 
objects (source #1 and source #3) which are in the 1RXS catalogue and 
five sources which are not catalogued in X-rays. At the present time we 
cannot be sure which of these, if any, is the afterglow. However, we 
note that the light curve of source #2, with a mean count rate of (1.23 
� 0.27) x 10^-2 ct s^-1, suggests evidence of decay.

Source details:

Source 1
RA:  28.58425  = 01h 54m 20.22s (J2000)
Dec:  -36.49342  = -36d 29' 36.3" (J2000)
Err: 4.4" (radius, 90% confidence)
Exposure time: 1.7 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_1.php

Source 2
RA:  28.53253  = 01h 54m 7.81s (J2000)
Dec:  -36.12000  = -36d 07' 12.0" (J2000)
Err: 5.4" (radius, 90% confidence)
Exposure time: 2.6 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_2.php

Source 3
RA:  28.63188  = 01h 54m 31.65s (J2000)
Dec:  -36.70189  = -36d 42' 06.8" (J2000)
Err: 5.4" (radius, 90% confidence)
Exposure time: 1.5 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_3.php

Source 4
RA:  29.24134  = 01h 56m 57.92s (J2000)
Dec:  -36.06453  = -36d 03' 52.3" (J2000)
Err: 6.2" (radius, 90% confidence)
Exposure time: 1.6 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_4.php

Source 5
RA:  28.36418  = 01h 53m 27.40s (J2000)
Dec:  -36.32146  = -36d 19' 17.3" (J2000)
Err: 5.7" (radius, 90% confidence)
Exposure time: 1.7 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_5.php

Source 6
RA:  28.46195  = 01h 53m 50.87s (J2000)
Dec:  -36.04399  = -36d 02' 38.4" (J2000)
Err: 6.2" (radius, 90% confidence)
Exposure time: 1.0 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_6.php

Source 7
RA:  28.94482  = 01h 55m 46.76s (J2000)
Dec:  -36.43079  = -36d 25' 50.8" (J2000)
Err: 6.2" (radius, 90% confidence)
Exposure time: 2.7 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00023/index_7.php

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