GCN Circular 35613

M. H. Siegel (PSU) and and V. D’Elia (SSDC & INAF-OAR) report on behalf of the
Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 240122A
from 29.5 ks to 35.6 ks after the MAXI trigger (Negoro et al., GCN Circ. 35593
Not found
 
 
).
No optical afterglow consistent with either the optical (Kumar et al., GCN
Circ. 35596
Not found
 
 
) or X-ray (Ambrosi et al., GCN Circ. 3600
Not found
 
 
) position is detected in the initial
UVOT exposures. The lack of detection in the u-band would be consistent with the
redshift of 3.162 given by Saccardi et al. (GCN Circ. 35599
Not found
 
 
).

Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures of
the candidate afterglow field are:

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

u                35166       35655          481         >20.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.064 in the direction of the burst
(Schlegel et al. 1998).