NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210218d03h43m03s404546usUT
NOTE: Source region spec. is: 97.58305 68.72516 3"
NOTE: Used archived uvot source position of  97.58305  68.72516  3.00
NOTE: position reference is GCN_Circ_29521
NOTE: A UVOT position was reported in GCN_Circ_29521
NOTE: Possible detection in uu at T+315.2
NOTE: Possible detection in wh at T+103.2

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

GRB 210217A: Swift/UVOT Upper Limits

K. K. Simpson (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210217A
103 s after the BAT trigger (Simpson et al., GCN Circ. 29521).
No optical afterglow consistent with the XRT position
(Evans et al. GCN Circ. 29525)
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           103          253          147         >18.6
white              103          253          147         >18.6
u                  315          508          190         >18.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.103 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 210217A: Swift/UVOT Detection

K. K. Simpson (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210217A
103 s after the BAT trigger (Simpson et al., GCN Circ. 29521).
A source consistent with the XRT position
(Evans et al. GCN Circ. 29525)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  06:30:19.89 =  97.58288 (deg.)
    Dec (J2000) = +68:43:30.6  =  68.72518 (deg.)
with an estimated uncertainty of 0.46 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              103          253          147         18.80 +/- 0.06
u                  315          508          190         18.64 +/- 0.11

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.103 in the direction of the burst
(Schlegel et al. 1998).