NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 220826d19h49m52s573393usUT
NOTE: Source region spec. is: 206.41047 -44.03866 3"
NOTE: Used archived uvot source position of 206.41047 -44.03866  3.00
NOTE: position reference is GCN_Circ_32488
NOTE: A UVOT position was reported in GCN_Circ_32488
NOTE: Possible detection in uu at T+302.9
NOTE: Possible detection in wh at T+90.7

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

GRB 220826A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and Caputo (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220826A
91 s after the BAT trigger (Caputo et al., GCN Circ. 32484).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 32485)
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            91          240          147         >18.0
u_FC               303          553          246         >18.4
white               91          873          199         >18.3
v                  632          827           39         >18.2
b                  559          753           39         >18.6
u                  303         5967          342         >18.6
w1                 682         5884          216         >19.3
m2                 658         5679          236         >19.6
w2                 608          802           39         >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.110 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 220826A: Swift/UVOT Detection

N. P. M. Kuin (UCL-MSSL) and Caputo (GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 220826A
91 s after the BAT trigger (Caputo et al., GCN Circ. 32484).
A source consistent with the XRT position
(Beardmore et al. GCN Circ. 32485)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  13:45:38.51 = 206.41047 (deg.)
    Dec (J2000) = -44:02:19.2  = -44.03866 (deg.)
with an estimated uncertainty of 0.45 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               91          240          147         18.18 +/- 0.05
v                  632          827           39        >18.2
b                  559          753           39        >18.6
u                  303          553          246         18.72 +/- 0.14
w1                 682         5884          216        >19.3
m2                 658         5679          236        >19.6
w2                 608          802           39        >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.110 in the direction of the burst
(Schlegel et al. 1998).