GCN Circular 32201
Subject
GRB 220611A: Swift/UVOT Upper Limits
Date
2022-06-15T16:59:08Z (2 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
M. H. Siegel (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 220611A
153 s after the BAT trigger (Cenko et al., GCN Circ. 32191).
No optical afterglow consistent with the XRT position
(Cenko et al. GCN Circ. 32191) 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 153 302 147 >19.5
u_FC 311 561 246 >19.1
white 153 926 245 >19.5
v 641 835 39 >17.0
b 566 759 39 >18.2
u 311 734 265 >19.1
w1 690 710 19 >17.7
m2 665 685 19 >17.9
w2 616 636 19 >18.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.033 in the direction of the burst
(Schlegel et al. 1998).