GCN Circular 27783

Subject

GRB 200522A: Swift/UVOT Upper Limits

Event

GRB 200522A

Date

2020-05-22T21:43:20Z (6 years ago)

From

Paul Kuin at MSSL <npkuin@gmail.com>

N. P. M. Kuin (UCL-MSSL) and P. A. Evans (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200522A
448 s after the BAT trigger (Evans et al., GCN Circ. 27778Loading...
 
 ).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 27778Loading...
 
 ) 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           448          598          147         >19.5
white              448          598          147         >19.5
v                  605          624           19         >17.2

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).