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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).
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