[vsnet-grb-info 15502] GRB140907A: Swift UVOT detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Sep 8 05:08:20 JST 2014
TITLE: GCN CIRCULAR
NUMBER: 16791
SUBJECT: GRB140907A: Swift UVOT detection
DATE: 14/09/07 20:08:13 GMT
FROM: Paul Kuin at MSSL <npkuin at gmail.com>
NPM Kuin (UCL/MSSL), and H. A. Krimm (CRESST/GSFC/USRA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140907A
(Krimm et al., GCN Circ. No. 16788) 107 seconds after the trigger.
There is a candidate afterglow in the rapidly available 2.7'x2.7'
sub-image at
RA(J2000) = 03:12:34.98 = 48.14575
DEC(J2000) = +46:36:17.5 = 46.60486
with a 90%-confidence error radius of about 0.75 arc sec, consistent
with the optical position from Xu et al. (GCN.Circ.No <http://gcn.circ.no/>.
16789).
Preliminary magnitudes observed in the initial images using the UVOT
photomatric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)
are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 107 257 150 16.66 +/- 0.04
u 321 534 213 16.61 +/- 0.06
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.29 in the direction of the burst
(Schlegel et al. 1998).
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