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GCN Circular 22327

Subject
GRB 180111A: Swift/UVOT Detection
Date
2018-01-13T13:53:26Z (6 years ago)
From
Jeffrey Gropp at PSU <jdg44@psu.edu>
J. D. Gropp (PSU) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180111A
98 s after the BAT trigger (Lien et al., GCN Circ. 22318).
A fading source consistent with the XRT position
(Evans et al. GCN Circ. 22319)
is detected in the initial UVOT exposures.

Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures
are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white               84           233          147          19.95+-0.21
white               86          6202         552           20.37+-0.16
v                     64           5181         206         >19.23
b                 4365           6002         393         >20.60
u                   296           5795         639           20.25+-0.35
w1               5391           5591         196         >19.50
m2                650             670            19         >17.15
w2               4776           6407          393           19.60+-0.27


The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).
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