NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 181010d17h51m32s794675usUT
NOTE: Source region spec. is: 52.57038 -23.03761 3"
NOTE: Used archived uvot source position of  52.57038 -23.03761  3.00
NOTE: position reference is GCN_Circ_23317
NOTE: A UVOT position was reported in GCN_Circ_23317
NOTE: Possible detection in wh at T+96.2

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

GRB 181010A: Swift/UVOT Upper Limits

S.W.K. Emery (UCL-MSSL) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 181010A
96 s after the BAT trigger (Melandri et al., GCN Circ. 23309).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 23313)
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            96          246          147         >19.2
u_FC               309          558          246         >19.8
white               96         6360          395         >20.0
v                 3867         5503          393         >19.3
b                  564         6323          413         >20.9
u                  309         6117          639         >20.5
w1                4277         5912          393         >20.1
m2                4072         5707          393         >20.9
w2                5098         5298          197         >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 181010A: Swift/UVOT Detection

S.W.K. Emery (UCL-MSSL) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 181010A
96 s after the BAT trigger (Melandri et al., GCN Circ. 23309).
A source consistent with the XRT position
(Evans et al. GCN Circ. 23313)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  03:30:16.89 =  52.57038 (deg.)
    Dec (J2000) = -23:02:15.4  = -23.03761 (deg.)
with an estimated uncertainty of 0.49 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               96          246          147         19.42 +/- 0.09
v                 3867         5503          393        >19.3
b                  564         6323          413        >20.9
u                  309         6117          639        >20.5
w1                4277         5912          393        >20.1
m2                4072         5707          393        >20.9
w2                5098         5298          197        >20.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).