[vsnet-grb-info 16066] GRB 150123A: Swift-XRT observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Jan 24 19:33:20 JST 2015
TITLE: GCN CIRCULAR
NUMBER: 17348
SUBJECT: GRB 150123A: Swift-XRT observations
DATE: 15/01/24 10:33:12 GMT
FROM: Andrea Melandri at INAF-OAB <andrea.melandri at brera.inaf.it>
A. Melandri, P. D'Avanzo, M.G. Bernardini (INAF-OAB) & P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has observed the error circle of the MAXI GRB 150123A in a series of observations tiled on the sky. The total exposure time is 3.7 ks spread over 4 fields; the maximum exposure within the sky observed was 1.6 ks. The observations started 9.8 ks after the MAXI trigger.
Within these data there are 3 objects which are not catalogued in the X-rays.
Source details:
Source 1
RA: 111.36420 = 07h 25m 27.41s (J2000)
Dec: -9.74880 = -09d 44' 55.7" (J2000)
Err: 5.9 (radius, 90% confidence)
Exposure time: 814 s
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00038/index_1.php
Source 2
RA: 111.52056 = 07h 26m 4.93s (J2000)
Dec: -9.65269 = -09d 39' 09.7" (J2000)
Err: 4.4 (radius, 90% confidence)
Exposure time: 1.3 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00038/index_2.php
Source 3
RA: 111.40659 = 07h 25m 37.58s (J2000)
Dec: -9.55462 = -09d 33' 16.6" (J2000)
Err: 5.2 (radius, 90% confidence)
Exposure time: 1.5 ks
Online products:
http://www.swift.ac.uk/xrt_products/TILED_GRB00038/index_3.php
Source #1 is located 3" from an optical source present in the USNO-B1.0 catalogue with a magnitude of R=15.5. Source #2 is located 4" from an optical source present in the USNO-B1.0 catalogue with a magnitude of R=18.0. Source #3 matches the position of the known bright star TYC 5400-1552-1 (R=10.8).
At the present time we cannot be sure which, if any, of these is the afterglow.
This circular is an official product of the Swift-XRT team.
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