[vsnet-grb-info 13980] GRB 131002A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Oct 3 20:42:46 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 15294
SUBJECT: GRB 131002A: Swift/UVOT Detection
DATE: 13/10/03 11:42:38 GMT
FROM: Alice Breeveld at MSSL-UCL <a.breeveld at ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and B. N. Barlow (High Point University)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131002A 77
s after the BAT trigger (Barlow et al., GCN Circ. 15283). A fading
source consistent with the optical position (Guidorzi GCN Circ. 15282)
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 early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 77 227 147 17.94 ± 0.06
white 870 1020 147 19.40 ± 0.11
v 620 1071 59 18.89 ± 0.36
b 546 739 39 19.41 ± 0.31
u 290 7169 736 >21.1
w1 669 6964 510 >20.7
m2 645 13293 939 >21.1
w2 770 11860 1199 >21.5
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.08 in the direction of the
burst (Schlegel et al. 1998).
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