[vsnet-grb-info 13554] GRB 130612A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Jun 13 02:42:30 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 14887
SUBJECT: GRB 130612A: Swift/UVOT Detection
DATE: 13/06/12 17:42:22 GMT
FROM: Alice Breeveld at MSSL-UCL <a.breeveld at ucl.ac.uk>
A. A. Breeveld (MSSL-UCL) and J. L. Racusin (NASA/GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130612A 94
s after the BAT trigger (Racusin et al., GCN Circ. 14874).
A fading source consistent with the XRT position (Beardmore et al. GCN
Circ. 14884) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 17:19:10.58 = 259.79408 (deg.)
Dec (J2000) = +16:43:11.9 = 16.71996 (deg.)
with an estimated uncertainty of 0.53 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 94 185 89 18.97 ± 0.07
v 763 7763 549 >20.6
b 688 13692 1307 >21.3
u 664 1655 117 19.68 ± 0.24
w1 639 18651 2143 >21.6
m2 614 17743 1406 >21.6
w2 738 7559 549 >21.1
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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