GCN Circular 16944
Subject
GRB 141022A: Swift/UVOT Upper Limits
Date
2014-10-22T20:09:48Z (10 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and A. Vargas (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141022A
136 s after the BAT trigger (Vargas et al., GCN Circ. 16938).
No optical afterglow consistent with the optical position
(Kann et al. GCN Circ. 16939) 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) 136 386 246 >20.2
v 443 1997 194 >19.9
b 392 1946 214 >20.6
u 136 1921 568 >20.7
uvw1 493 1895 175 >20.7
uvm2 468 2011 185 >20.5
uvw2 418 1973 194 >20.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).