GCN Circular 22327

Subject

GRB 180111A: Swift/UVOT Detection

Event

Date

2018-01-13T13:53:26Z (8 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. 22318Loading...
 
 ).
A fading source consistent with the XRT position
(Evans et al. GCN Circ. 22319Loading...
 
 )
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).