NOTE: uvot_fluxes_wget.pl vrs. 2018-01-16 fem at 180824d12h46m52s715669usUT
NOTE: Source region spec. is: 210.35583 14.89244 4"
NOTE: Used archived XRT position of 210.35583  14.89244  4.00
NOTE: position reference is GCN_Circulars-23170
NOTE: Possible detection in vv at T+4686.3

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

GRB 180823A: Swift/UVOT Upper Limits

S. Sebzda (PSU) and B. Sbarufatti (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180823A
381 s after the BAT trigger (Sbarufatti et al., GCN Circ. 23169).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 23170)
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 initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white              381         4476          380         >20.9
v                 4686        10356          927         >19.2
b                 4071         4271          197         >19.7
u                 3866         4066          197         >19.8
m2               10361        10803          435         >19.8
w2                4482         4681          197         >20.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 180823A: Swift/UVOT Detection

S. Sebzda (PSU) and B. Sbarufatti (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 180823A
381 s after the BAT trigger (Sbarufatti et al., GCN Circ. 23169).
A source consistent with the XRT position
(Goad et al. GCN Circ. 23170)
is detected in the initial UVOT exposures.

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              381         4476          380        >20.9
v                 4686         4729           42         18.05 +/- 0.32
b                 4071         4271          197        >19.7
u                 3866         4066          197        >19.8
m2               10361        10803          435        >19.8
w2                4482         4681          197        >20.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).