NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210611d07h14m37s735078usUT
NOTE: Source region spec. is: 243.91836 14.39909 3"
NOTE: Used archived uvot source position of 243.91836  14.39909  3.00
NOTE: position reference is GCN_Circ_30170
NOTE: A UVOT position was reported in GCN_Circ_30170
NOTE: Possible detection in uu at T+304.1
NOTE: Possible detection in wh at T+92.4
NOTE: Possible detection in bb at T+559.4
NOTE: Possible detection in w1 at T+682.5
NOTE: Possible detection in vv at T+633.5
NOTE: Possible detection in w2 at T+783.2
WARNING: Did not recognize UBS name.

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

GRB 210610B: Swift/UVOT Upper Limits

Baer (***INSTITUTION***) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210610B
92 s after the BAT trigger (Page et al., GCN Circ. 30170).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 30189)
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            92          242          147         >13.2
u_FC               304          554          246         >13.8
white               92         1355          373         >14.6
v                  634         1405           97         >15.5
b                  559         1330           78         >15.7
u                  304         5040          491         >14.6
w1                 682         4845          255         >15.8
w2                 783         1034           39         >15.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.044 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 210610B: Swift/UVOT Detection

Baer (***INSTITUTION***) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210610B
92 s after the BAT trigger (Page et al., GCN Circ. 30170).
A source consistent with the XRT position
(Osborne et al. GCN Circ. 30189)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  16:15:40.40 = 243.91833 (deg.)
    Dec (J2000) = +14:23:56.9  =  14.39915 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).

Preliminary detections 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               92          242          147         13.32 +/- 0.03
v                  634          653           19         15.08 +/- 0.08
b                  559          579           20         15.29 +/- 0.05
u                  304          554          246         13.88 +/- 0.02
w1                 682          702           19         14.42 +/- 0.07
w2                 783          803           19         15.44 +/- 0.12

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.044 in the direction of the burst
(Schlegel et al. 1998).