NOTE: uvot_fluxes_wget.pl vrs. 2024-08-27 fem at 251201d21h18m47s518261usUT
NOTE: Source region spec. is: 6.39413 -44.23364 3"
NOTE: Used archived uvot source position of   6.39413 -44.23364  3.00
NOTE: position reference is GCN_Circ_42924
NOTE: A UVOT position was reported in GCN_Circ_42924
NOTE: Possible detection in vv at T+643.5
NOTE: Possible detection in wh at T+101.3
NOTE: Possible detection in w1 at T+1098.0 sum
NOTE: Possible detection in bb at T+569.6
NOTE: Possible detection in uu at T+314.3

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

GRB 251201B: Swift/UVOT Upper Limits

***UBS*** (***INSTITUTION***) and M. J. Moss (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 251201B
101 s after the BAT trigger (Moss et al., GCN Circ. 42924).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
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           101          251          147         >17.2
u_FC               314          564          246         >16.4
white              101         1709          411         >17.2
v                  644         1759          136         >16.5
b                  570         1685          117         >17.1
u                  314         1832          363         >16.6
w1                 693         1808          117         >17.9
m2                 668         1093           39         >18.7
w2                1196         1562           39         >18.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.008 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 251201B: Swift/UVOT Detection

***UBS*** (***INSTITUTION***) and M. J. Moss (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 251201B
101 s after the BAT trigger (Moss et al., GCN Circ. 42924).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  00:25:34.60 =   6.39416 (deg.)
    Dec (J2000) = -44:14:01.2  = -44.23368 (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              101          251          147         17.31 +/- 0.03
v                  644          663           19         15.97 +/- 0.12
b                  570          589           20         16.71 +/- 0.10
u                  314          564          246         16.48 +/- 0.04
w1                 693         1808          117         18.35 +/- 0.18
m2                 668         1093           39        >18.7
w2                1196         1562           39        >18.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.008 in the direction of the burst
(Schlegel et al. 1998).