[vsnet-grb-info 18767] GRB 161129A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Nov 30 06:21:00 JST 2016
TITLE: GCN CIRCULAR
NUMBER: 20217
SUBJECT: GRB 161129A: Swift/UVOT Detection
DATE: 16/11/29 21:20:05 GMT
FROM: Paul Kuin at MSSL <npkuin at gmail.com>
N. P. M. Kuin (UCL-MSSL) and D. Kocevski (NASA/GSFC/ORAU) report on
behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 161129A
86 s after the BAT trigger (Kocevski et al., GCN Circ. 20210).
A source consistent with the XRT position (Beardmore et al. GCN Circ.
20211) is detected in the initial UVOT exposures.
The source is detected in UVOT images at position:
RA = 21h 04m 54.6s (J2000)
Dec = 32d 08' 05.52" (J2000)
with an uncertainty of 0.6" (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 86 6356 400 20.61 +/- 0.20
v 3858 5493 393 >19.0
b 554 6314 413 >20.0
u 298 6109 639 >19.8
w1 4268 5903 393 >19.4
m2 4063 5698 393 >19.6
w2 604 5288 208 >19.5
There are low-significance signs of the source in all other filters. Though
the source seems to reach peak brightness around 500s the photometric
errors are also consistent with a constant source brightness up to 10ks.
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.21 in the direction of the burst
(Schlegel et al. 1998).
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