NOTE: uvot_fluxes_wget.pl vrs. 2020-11-03a fem at 210730d11h02m10s355908usUT
NOTE: Source region spec. is: 149.59013 69.68936 4"
NOTE: Used archived XRT position of 149.59013  69.68936  4.00
NOTE: position reference is GCN_Circulars-30550
NOTE: Possible detection in uu at T+3534.8
NOTE: Possible detection in wh at T+90.4
NOTE: Possible detection in bb at T+3740.0
NOTE: Possible detection in w1 at T+4765.3
NOTE: Possible detection in vv at T+4355.4
NOTE: Possible detection in w2 at T+4150.8

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

GRB 210730A: Swift/UVOT Upper Limits

N. P. M. Kuin (UCL-MSSL) and E. Sonbas (Adiyaman Univ.)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210730A
90 s after the BAT trigger (Sonbas et al., GCN Circ. 30548).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 30550)
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            90          204          112         >17.0
white               90         4145          308         >16.7
v                 4355         4555          197         >15.5
b                 3740         3940          197         >16.4
u                 3535         5146          370         >16.5
w1                4765         4965          197         >18.0
m2                4560         4760          197         >19.7
w2                4151         4351          197         >18.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.097 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 210730A: Swift/UVOT Detection

N. P. M. Kuin (UCL-MSSL) and E. Sonbas (Adiyaman Univ.)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 210730A
90 s after the BAT trigger (Sonbas et al., GCN Circ. 30548).
A source consistent with the XRT position
(Beardmore et al. GCN Circ. 30550)
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               90          204          112         17.13 +/- 0.04
v                 4355         4555          197         15.60 +/- 0.04
b                 3740         3940          197         16.47 +/- 0.04
u                 3535         3735          197         16.67 +/- 0.05
w1                4765         4965          197         18.40 +/- 0.16
m2                4560         4760          197        >19.7
w2                4151         4351          197         19.17 +/- 0.24

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.097 in the direction of the burst
(Schlegel et al. 1998).