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 17594

GRB 150317A: Enhanced Swift-XRT position
2015-03-17T08:03:37Z (9 years ago)
Phil Evans at U of Leicester <>
P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the
Swift-XRT team:

Using 2091 s of XRT Photon Counting mode data and 2 UVOT images, 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 = 138.98467, 55.46618 which is equivalent to:

RA  (J2000):  09h 15m 56.32s
Dec (J2000): +55d 27' 58.2"

with an uncertainty of 2.2 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