GCN Circular 15414
Subject
GRB 131030A: Swift/UVOT Detection
Date
2013-10-31T11:46:48Z (10 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131030A 90
s after the BAT trigger (Troja et al., GCN Circ. 15402). A fading source
consistent with the XRT position (Troja et al. GCN Circ. 15402) is
clearly detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 23:00:16.14 = 345.06723 (deg.)
Dec (J2000) = -05:22:05.2 = -5.36811 (deg.)
with an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system (Breeveld et
al. 2011, AIP Conf. Proc. 1358, 373) for the finding chart (FC) and
other early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 90 239 148 14.87 � 0.02
white 582 601 20 16.13 � 0.05
u_FC 302 552 246 15.30 � 0.03
b 557 577 20 16.30 � 0.08
v 631 651 19 15.98 � 0.13
uvw1 681 701 19 16.42 � 0.17
uvm2 656 676 20 16.63 � 0.24
uvw2 606 626 20 17.97 � 0.36
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.06 in the direction of the
burst (Schlegel et al. 1998).