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GCN Circular 16944

GRB 141022A: Swift/UVOT Upper Limits
2014-10-22T20:09:48Z (10 years ago)
Mike Siegel at PSU/Swift MOC <>
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).
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