NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 191005d20h19m41s464108usUT
NOTE: Source region spec. is: 49.20458 -39.63425 3"
NOTE: Used archived uvot source position of  49.20458 -39.63425  3.00
NOTE: position reference is GCN_Circ_25947
NOTE: A UVOT position was reported in GCN_Circ_25947
NOTE: Possible detection in wh at T+68.9

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

GRB 191004B: Swift/UVOT Upper Limits

S. J. LaPorte (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191004B
69 s after the BAT trigger (Cenko et al., GCN Circ. 25947).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 25951)
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            69          219          147         >18.0
white               69          219          147         >18.0
u                  281          374           92         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 191004B: Swift/UVOT Detection

S. J. LaPorte (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191004B
69 s after the BAT trigger (Cenko et al., GCN Circ. 25947).
A source consistent with the XRT position
(Beardmore et al. GCN Circ. 25951)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  03:16:49.10 =  49.20459 (deg.)
    Dec (J2000) = -39:38:03.9  = -39.63441 (deg.)
with an estimated uncertainty of 0.43 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               69          219          147         18.14 +/- 0.05
u                  281          374           92        >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).