GCN Circular 20455
Subject
GRB 170113A: Swift/UVOT Observations
Date
2017-01-13T20:40:06Z (8 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and P. A. Evans (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170113A
68 s after the BAT trigger (Evans et al., GCN Circ. 20446).
A fading source consistent with the XRT position
(Goad et al. GCN Circ. 20450)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 04:06:55.86 = 61.73276 (deg.)
Dec (J2000) = -71:56:34.9 = -71.94302 (deg.)
with an estimated uncertainty of 0.44 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white (fc) 68 217 147 18.27+-0.06
white 560 1009 186 19.56+-0.11
white 1163 1875 97 19.65+-0.17
white 6392 6592 196 20.64+-0.26
v 609 1751 136 19.09+-0.36
v 5367 7002 393 >19.49
b 535 1850 136 19.33+-0.19
b 6188 6388 196 >20.39
u (fc) 280 530 245 18.76+-0.13
u 683 1825 116 19.33+-0.27
u 5983 7615 390 >20.44
uvw1 659 1801 136 >19.38
uvm2 634 1776 136 >19.12
uvw2 585 1727 136 >19.42
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.11 in the direction of the burst
(Schlegel et al. 1998).