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GCN Circular 24731

GRB 190531B: Swift/UVOT Upper Limits
2019-06-03T19:12:44Z (5 years ago)
Kira Simpson at PSU <>
GRB 190531B: Swift/UVOT Upper Limits

K. K. Simpson (PSU)
reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190531B
18175 s after the LAT trigger (Axelsson et al., GCN Circ. 24701).
No optical afterglow consistent with the XRT position
(D'Avanzo et al., GCN Circ. 24706)
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 initial exposures

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

b                18661        24137          365         >20.5
u                18497        29702          551         >21.1
w1               18175        29509         1132         >20.7
m2               19630        25766          972         >20.9
w2               18826        24990         1459         >21.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).
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