NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220518d18h05m00s375004usUT
NOTE: Source region spec. is: 55.34289 -47.58342 3"
NOTE: Used archived uvot source position of  55.34289 -47.58342  3.00
NOTE: position reference is GCN_Circ_32063
NOTE: A UVOT position was reported in GCN_Circ_32063
NOTE: Possible detection in wh at T+129.5

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

GRB 220518A: Swift/UVOT Upper Limits

S. R. Oates (U.Birmingham) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220518A
130 s after the BAT trigger (Gropp et al., GCN Circ. 32060).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 32062)
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           130          279          147         >19.4
u_FC               341          591          246         >20.0
white              130         1717          412         >20.0
v                  671         1768          136         >18.8
b                  597         1861          131         >20.7
u                  341         1841          304         >20.0
w1                1102         1296           39         >19.2

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 220518A: Swift/UVOT Detection

S. R. Oates (U.Birmingham) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220518A
130 s after the BAT trigger (Gropp et al., GCN Circ. 32060).
A source consistent with the XRT position
(Beardmore et al. GCN Circ. 32062)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  03:41:22.29 =  55.34289 (deg.)
    Dec (J2000) = -47:35:00.3  = -47.58342 (deg.)
with an estimated uncertainty of 0.55 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              130          279          147         19.84 +/- 0.15
v                  671         1768          136        >18.8
b                  597         1861          131        >20.7
u                  341         1841          304        >20.0
w1                1102         1296           39        >19.2

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).