NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180329d22h07m00s333891usUT
NOTE: Source region spec. is: 82.90376 -23.69052 3"
NOTE: Used archived uvot source position of  82.90376 -23.69052  3.00
NOTE: position reference is GCN_Circ_22558
NOTE: A UVOT position was reported in GCN_Circ_22558
NOTE: Possible detection in uu at T+270.7
NOTE: Possible detection in wh at T+112.8
NOTE: Possible detection in bb at T+526.5
NOTE: Possible detection in w1 at T+821.9
NOTE: Possible detection in vv at T+601.3

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

GRB 180329B: Swift/UVOT Upper Limits

S.W.K. Emery (UCL-MSSL) and J. L. Racusin (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180329B
113 s after the BAT trigger (Racusin et al., GCN Circ. 22558).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 22559)
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           113          263          147         >17.7
u_FC               271          520          246         >16.4
white              113         6893          746         >17.7
v                  601         5868          274         >17.3
b                  526         6688          452         >18.1
u                  271         6483          697         >17.1
w1                 650         6278          452         >18.3
m2                 626         6073          255         >20.3
w2                 577         7017          390         >20.2

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 180329B: Swift/UVOT Detection

S.W.K. Emery (UCL-MSSL) and J. L. Racusin (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180329B
113 s after the BAT trigger (Racusin et al., GCN Circ. 22558).
A source consistent with the XRT position
(Beardmore et al. GCN Circ. 22559)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  05:31:36.91 =  82.90381 (deg.)
    Dec (J2000) = -23:41:25.8  = -23.69051 (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              113          263          147         17.80 +/- 0.04
v                  601          621           19         16.71 +/- 0.17
b                  526          546           19         16.93 +/- 0.10
u                  271          520          246         16.52 +/- 0.04
w1                 650         1122           58         17.66 +/- 0.19
m2                 626         6073          255        >20.3
w2                 577         7017          390        >20.2

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).