TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3133
SUBJECT: Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
DATE:    05/03/21 22:15:51 GMT
FROM:    David Burrows at PSU/Swift  <dxb15@psu.edu>

A. P. Beardmore, K. L. Page (U. Leicester), V. Mangano (INAF-IASF/Palermo), 
P. Romano (INAF-OAB), M. R. Goad, O. Godet, J. P. Osborne (U. Leicester), 
G. Chincarini, S. Campana (INAF-OAB), D. N. Burrows, J. L. Racusin 
(PSU),  G. Cusumano, T. Mineo (INAF-IASF/Palermo), M. Perri, F. Tamburelli 
(ASDC), L. Angelini, F. Marshall, N. Gehrels (GSFC) report on behalf of the 
Swift XRT team:

We report refined XRT source positions for GRB 050315 (GCN3094, GCN3097), 
GRB 050318 (GCN3111, GCN3113), and GRB 050319 (GCN3117), based on improved 
ground-based analysis of extended data sets from these three bursts.  We 
find the following afterglow positions:

GRB 050315: RA(J2000) = 20:25:53.9, Dec(J2000) = -42:36:01.4 (P. Romano), 
which is 2.3" from the optical counterpart (GCN3100).

GRB 050318: RA(J2000) = 03:18:51.1, Dec(J2000) = -46:23:44.7 (V. Mangano), 
which is 1.1" from the optical counterpart (GCN3123).

GRB 050319: RA(J2000) = 10:16:48.1, Dec(J2000) = +43:32:52.3 (K. Page), 
which is 3.1" from the optical counterpart (GCN3116).