[vsnet-grb-info 27389] GRB 210212A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29492
SUBJECT: GRB 210212A: Swift/UVOT Upper Limits
DATE:    21/02/12 14:53:24 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N. P. M. Kuin (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210212A
112 s after the BAT trigger (Troja et al., GCN Circ. 29487).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 29489)
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           112          262          147         >20.6
u_FC               271          520          246         >20.3
white              112          930          242         >20.8
v                  600         4588          236         >19.0
b                  526          720           39         >19.3
u                  271          868          285         >20.4
w1                 650         4851           90         >19.1
m2                 626         4793          235         >19.7
w2                  93         4383          245         >19.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.094 in the direction of the burst
(Schlegel et al. 1998).