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GCN Circular 24945

GRB 190630C: Swift/UVOT Upper Limits
2019-07-01T19:32:37Z (5 years ago)
Kira Simpson at PSU <>
GRB 190630C: Swift/UVOT Upper Limits

K. K. Simpson (PSU) and T. N. Ukwatta (LANL)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190630C
136 s after the BAT trigger (Ukwatta et al., GCN Circ. 24927).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 24930)
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           157          307          147         >20.5
white              157          307          147         >20.5
v                  136          412           32         >18.1
w2                 367          387           19         >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.11 in the direction of the burst
(Schlegel et al. 1998).
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