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GCN Circular 19897

Subject
GRB 160905A: Swift/UVOT Detection
Date
2016-09-06T10:55:43Z (8 years ago)
From
Sam Emery at MSSL-UCL <samuel.emery.15@ucl.ac.uk>
S.W.K. Emery (UCL-MSSL) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160905A
67 s after the BAT trigger (D'Avanzo et al., GCN Circ. 19887), which was
also detected by Fermi-GBM (GCN 19889) and Fermi-LAT (GCN 19890).
A fading source consistent with the XRT position
(Osborne et al. GCN Circ. 19891) 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          67           216          147         15.8 � 0.03
white                 67         2234          469         17.1 � 0.05
u_FC              280           530          246         18.3 � 0.15
u                      280         2185          401         18.8 � 0.16
v                      610         2285          195         17.4 � 0.12
b                      536         2210          175         18.7 � 0.16
w1                   660         2160          175         >19.1
m2                   635         2296          162         >19.1
w2                   586         2260          195         >19.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.45 in the direction of the burst
(Schlegel et al. 1998).
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