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GCN Circular 32390

GRB 220710A: Swift/UVOT Upper Limits
2022-07-14T06:28:25Z (a year ago)
Alice Breeveld at MSSL-UCL <>
A.A. Breeveld (UCL-MSSL) and N. J. Klingler (GSFC/UMBC/CRESTII) report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220710A 242493 s after the GECAM/GUANO 
trigger (Tohuvavohu et al., GCN Circ. 32375).
No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 32385) is detected 
in the UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. 
Proc. 1358, 373) for the initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white           242493       287404         4429         >22.9

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of 
E(B-V) = 0.030 in the direction of the burst (Schlegel et al. 1998).
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