[vsnet-grb-info 13854] GRB 130831A: Swift/UVOT Observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Sep 2 23:17:59 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 15168
SUBJECT: GRB 130831A: Swift/UVOT Observations
DATE: 13/09/02 14:17:51 GMT
FROM: Margaret Chester at PSU <chester at astro.psu.edu>
M. M. Chester (PSU) and L.M.Z. Hagen (PSU) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130831A
(Hagen et al., GCN Circ. 15139) 191 seconds after the BAT trigger.
A source consistent with the enhanced XRT position (Evans et al.,
GCN Circ. 15147) is detected in the initial UVOT exposures.
Preliminary detections and 3-sigma upper limits using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373)
for the first finding chart (FC) exposures and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
v 498 818 58 14.4 +/- 0.1
v 10802 11709 885 18.0 +/- 0.1
v 46801 47000 196 > 18.9
b 448 767 58 14.9 +/- 0.1
b 23522 23925 393 19.2 +/- 0.2
b 40193 41100 885 20.1 +/- 0.2
u_FC 191 441 246 14.6 +/- 0.1
u 572 742 39 13.9 +/- 0.1
u 16594 23517 1645 18.3 +/- 0.1
w1 548 849 40 13.9 +/- 0.1
w1 15688 16588 886 18.1 +/- 0.1
m2 673 843 39 13.6 +/- 0.1
m2 11714 12387 663 17.5 +/- 0.1
w2 474 494 19 14.8 +/- 0.1
w2 9896 10796 886 17.5 +/- 0.1
w2 41107 46795 1009 19.3 +/- 0.2
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.04 in the direction
of the burst (Schlegel et al. 1998).
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