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GCN Circular 32252

GRB 220623A: Swift/UVOT Upper Limits
2022-06-23T18:32:09Z (2 years ago)
Alexander Belles at PSU/Swift <>
A. Belles (PSU) and B. Sbarufatti (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220623A
4034 s after the BAT trigger (Sbarufatti et al., GCN Circ. 32243).
No optical afterglow consistent with the XRT position
(Kennea et al. GCN Circ. 32244)
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          4034         4184          147         >19.9
white             4034         5415          344         >20.1
v                 4190         9642          326         >18.9
b                 5010         5210          197         >19.4
u                 4805         5005          197         >19.0
w1                4600         4800          197         >19.3
m2                4395         4595          197         >19.9
w2                5421         5621          197         >19.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.036 in the direction of the burst
(Schlegel et al. 1998).
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