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GCN Circular 17008

Subject
GRB 141031A: Swift/UVOT Upper Limits
Date
2014-10-31T20:11:19Z (10 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (IAA-CSIC/UCL-MSSL) and B. P. Gompertz (U Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 141031A
102 s after the BAT trigger (Gompertz et al., GCN Circ. 16995).
No optical afterglow consistent with the possible optical position
(Tanga et al. GCN Circ. 16996) or enhanced XRT position 
(Evans et al. GCN Circ. 16997) 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           102          252          147         >20.9
u_FC               315          565          246         >19.9
white              102        18038          967         >21.8
v                  646        13448          759         >20.0
b                  571        17791         1414         >21.4
u                  315        23978         1180         >20.7
w1                 696        23537         1396         >21.0
m2                 670         6964          529         >20.2
w2                 621        12030         1238         >21.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.17 in the direction of the burst
(Schlegel et al. 1998).
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