[vsnet-grb-info 17685] GRB 160227A: Swift/UVOT Detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Mar 1 06:49:10 JST 2016
TITLE: GCN CIRCULAR
NUMBER: 19122
SUBJECT: GRB 160227A: Swift/UVOT Detection
DATE: 16/02/29 21:48:36 GMT
FROM: Mike Siegel at PSU/Swift MOC <siegel at swift.psu.edu>
M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160227A
161 s after the BAT trigger (Siegel et al., GCN Circ. 19098).
A source consistent with the XRT position
(Osborne et al. GCN Circ. 19104)
is detected in the initial UVOT exposures but had faded away
in later exposures.
The preliminary UVOT position is:
RA (J2000) = 12:59:13.80 = 194.80750 (deg.)
Dec (J2000) = +78:40:45.1 = 78.67920 (deg.)
with an estimated uncertainty of 0.46 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 (fc) 161 311 147 19.34 +/- 0.10
white 600 2418 341 19.80 +/- 0.13
white 6755 8196 201 >20.82
v 650 7366 400 19.40 +/- 0.25
b 575 2393 194 19.71 +/- 0.35
b 6550 8186 393 >20.10
u (fc) 319 569 245 19.44 +/- 0.20
u 724 2368 174 >19.22
w1 699 7776 540 >20.5
m2 1082 7570 432 >21.1
w2 1206 7161 294 >20.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).
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