[vsnet-grb-info 17493] GRB 160121A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Jan 22 18:28:53 JST 2016
TITLE: GCN CIRCULAR
NUMBER: 18922
SUBJECT: GRB 160121A: Swift/UVOT Upper Limits
DATE: 16/01/22 09:26:13 GMT
FROM: Samantha Oates at MSSL <sro at mssl.ucl.ac.uk>
S. R. Oates (IAA-CSIC/UCL-MSSL) and L. M. Z. Hagen (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160121A
152 s after the BAT trigger (Hagen et al., GCN Circ. 18912).
No optical afterglow consistent with the optical position
reported by MOA (Oates et al., GCN Circ. 18917) 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
u_FC 152 401 246 >19.7
v 435 830 78 >18.6
u 152 918 356 >19.9
w1 484 754 58 >18.3
m2 459 854 78 >18.4
w2 410 805 78 >18.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.53 in the direction of the burst
(Schlafly and Finkbeiner 2011).
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