[vsnet-grb-info 16506] GRB 150428B: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Apr 29 22:21:06 JST 2015
TITLE: GCN CIRCULAR
NUMBER: 17787
SUBJECT: GRB 150428B: Swift/UVOT Upper Limits
DATE: 15/04/29 13:20:58 GMT
FROM: Margaret Chester at PSU <chester at swift.psu.edu>
M. M. Chester (PSU) and K. L. Page (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150428B 117
s after the BAT trigger (Page et al., GCN Circ. 17766). No optical
afterglow consistent with the enhanced XRT position (Beardmore et al., GCN
Circ. 17773) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposures and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) UL (3-sigma)
white_FC 117 267 146 >20.9
u_FC 329 579 246 >20.1
white 117 5414 588 >21.6
v 659 5825 313 >19.6
b 584 6598 445 >20.8
u 329 6440 717 >20.8
w1 708 6235 293 >20.0
m2 683 6030 294 >19.9
w2 634 5620 313 >20.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.40 in the direction of the burst
(Schlegel et al. 1998).
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