[vsnet-grb-info 24760] GRB 200122A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26859
SUBJECT: GRB 200122A: Swift/UVOT Upper Limits 
DATE:    20/01/22 23:29:02 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <mhs18 at psu.edu>

A. Belles (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 200122A
82 s after the BAT trigger (Sonbas et al., GCN Circ. 26844).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 26846)
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            82          232          147         >21.1
u_fc               294          544          246         >20.9
white               82         5672          627         >21.7
v                  624         6083          352         >19.4
b                  550         5467          333         >20.6
u                  294         1844          363         >20.7
w1                 674         1472           58         >20.1
m2                6088         6276          186         >19.5
w2                5678         5878          197         >20.3

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).