[vsnet-grb-info 20400] GRB 180314B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22496
SUBJECT: GRB 180314B: Swift/UVOT Upper Limits
DATE:    18/03/15 16:38:44 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (U.Warwick) 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 180314B
94 s after the BAT trigger (D'Avanzo et al., GCN Circ. 22491).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 22494)
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            94          244          147         >19.6
u_FC               308          558          246         >19.3
white               94         7249          666         >19.7
v                  638         7660          607         >18.4
b                  563        11580          471         >19.3
u                  308         8274          834         >19.6
w1                 687         8070          588         >19.5
m2                 662         7865          607         >20.4
w2                 614         7455          607         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 2.21 in the direction of the burst
(Schlegel et al. 1998).