GCN Circular 24792

GRB 190611A: Swift/UVOT Upper Limits

K. K. Simpson (PSU) and V. D'Elia (SSDC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190611A
118 s after the BAT trigger (D'Elia et al., GCN Circ. 24785
Not found
 
 
).
No optical afterglow consistent with the XRT position (Goad et al., GCN
Circ. 24786
Not found
 
 
)

RA (J2000): 21h 38m 53.44s
Dec (J2000): -56d 04' 27.3"

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           118          268          147         >20.1
u_FC               276          525          246         >19.2
white              118          917          186         >20.0
u                  276          525          246         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).