GCN Circular 27929

GRB 200612A: Swift/UVOT Upper Limits

S. J. LaPorte (PSU) and E. Sonbas (Adiyaman Univ.)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200612A
96 s after the BAT trigger (Sonbas et al., GCN Circ. 27915
Not found
 
 
).
No optical afterglow consistent with the optical position
(Lipunov et al. GCN Circ. 27917
Not found
 
 
)
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            96          245          147         >20.6
white               96          245          147         >20.6
u                  308          375           67         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).