NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 191123d21h02m21s671677usUT
NOTE: Source region spec. is: 215.26196 22.86008 3"
NOTE: Used archived uvot source position of 215.26196  22.86008  3.00
NOTE: position reference is GCN_Circ_26279
NOTE: A UVOT position was reported in GCN_Circ_26279
NOTE: Possible detection in wh at T+78.3
NOTE: Possible detection in bb at T+545.8
NOTE: Possible detection in vv at T+793.2 sum

=========== Draft Upper Limit Circular ========

GRB 191123A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and A. Tohuvavohu (U. Toronto)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191123A
78 s after the BAT trigger (Tohuvavohu et al., GCN Circ. 26279).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 26284)
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            78          228          147         >18.1
u_FC               290          540          246         >20.3
white               78        18487         1278         >19.7
v                  620        12557          727         >18.9
b                  546        17865         1257         >20.7
u                  290         6376          501         >20.4
w1                 669         6171          372         >19.9
m2                1074         5966          216         >19.8
w2                 595        12186          944         >20.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).


=========== Draft Detection Circular ========

GRB 191123A: Swift/UVOT Detection

N. P. M. Kuin (UCL-MSSL) and A. Tohuvavohu (U. Toronto)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191123A
78 s after the BAT trigger (Tohuvavohu et al., GCN Circ. 26279).
A source consistent with the XRT position
(Goad et al. GCN Circ. 26284)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  14:21:02.88 = 215.26200 (deg.)
    Dec (J2000) = +22:51:36.1  =  22.86002 (deg.)
with an estimated uncertainty of 0.44 arc sec. (radius, 90% confidence).

Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: 

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

white               78          228          147         18.25 +/- 0.05
v                  620         2111          175         18.28 +/- 0.19
b                  546         1168           58         19.18 +/- 0.25
u                  290         6376          501        >20.4
w1                 669         6171          372        >19.9
m2                1074         5966          216        >19.8
w2                 595        12186          944        >20.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).