Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 16470

GRB 140628A: Swift-XRT afterglow detection and enhanced position
2014-06-28T18:52:42Z (10 years ago)
Maria Grazia Bernardini at INAF/Brera <>
P. D'Avanzo, M.G. Bernardini, A. Melandri (INAF/OAB), P.A. Evans and
M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:

Using promptly downlinked data we find an uncatalogued and
fading X-ray source. Using 40 s of XRT Photon Counting mode
data and 1 UVOT image, we find an astrometrically corrected
X-ray position (using the XRT-UVOT alignment and matching
UVOT field sources to the USNO-B1 catalogue):
RA, Dec =40.66674, -0.38488 which is equivalent to:

RA (J2000):  02 42 40.02
Dec (J2000): -00 23 05.6

with an uncertainty of 2.5 arcsec (radius, 90% confidence).

This position may be improved as more data are received.  The latest
position can be viewed at Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).

This circular is an official product of the Swift-XRT team.
Looking for U.S. government information and services? Visit