[vsnet-grb-info 23380] GRB 190824A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25479
SUBJECT: GRB 190824A: Swift/UVOT Upper Limits
DATE:    19/08/26 12:55:49 GMT
FROM:    Kira Simpson at PSU  <kira.simpson1984 at gmail.com>

GRB 190824A: Swift/UVOT Upper Limits

K. K. Simpson (PSU) and V. D'Elia (SSDC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190824A
568 s after the BAT trigger (D'Elia et al., GCN Circ. 25463).
No optical afterglow consistent with the XRT position
(Osborne et al., GCN Circ. 25466)
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           568          718          147         >19.9
white              568         1721          389         >19.9
v                 1058         6747          196         >17.8
b                  799         1697           97         >18.9
u                  774         1672           97         >19.3
w1                 750         1647           97         >18.4
m2                 725         1622           97         >19.6
w2                 849         1742           74         >18.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.12 in the direction of the burst
(Schlegel et al. 1998).