[vsnet-grb-info 16661] GRB 150616A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Jun 18 04:38:16 JST 2015
TITLE: GCN CIRCULAR
NUMBER: 17942
SUBJECT: GRB 150616A: Swift/UVOT Upper Limits
DATE: 15/06/17 19:38:08 GMT
FROM: Mike Siegel at PSU/Swift MOC <siegel at swift.psu.edu>
S. J. LaPorte (PSU) and A. Y. Lien (GSFC/UMBC) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150616A
579 s after the BAT trigger (Lien et al., GCN Circ. 17936).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 17937) 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) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 579 729 147 >21.0
white 579 7913 616 >21.8
v 736 2624 214 >19.6
b 836 2878 365 >20.5
u 810 2700 214 >20.5
w1 786 2674 214 >20.2
m2 760 2649 136 >19.9
w2 1016 2250 156 >20.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).
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