NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 200901d14h41m39s566206usUT
NOTE: Source region spec. is: 61.78237 -59.89089 4"
NOTE: Used archived XRT position of  61.78237 -59.89089  4.00
NOTE: position reference is GRB_Auto_Processing
NOTE: Possible detection in uu at T+3505.9
NOTE: Possible detection in wh at T+3915.9

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

GRB 200901A: Swift/UVOT Upper Limits

A. A. Breeveld (UCL-MSSL) and K. K. Simpson (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200901A
3053 s after the BAT trigger (Simpson et al., GCN Circ. 28335).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GRB_Auto_Processing ***
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          3053         3203          147         >20.4
white             3053         4116          344         >20.4
v                 4327         4526          197         >19.3
b                 3711         3911          197         >20.0
u                 3212         4988          290         >19.6
w1                4737         4936          197         >18.9
m2                4531         4731          197         >20.6
w2                4122         4321          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 200901A: Swift/UVOT Detection

A. A. Breeveld (UCL-MSSL) and K. K. Simpson (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200901A
3053 s after the BAT trigger (Simpson et al., GCN Circ. 28335).
A source consistent with the XRT position
*** POSITION REFERENCE is GRB_Auto_Processing ***
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             3053         4116          344         20.88 +/- 0.19
v                 4327         4526          197        >19.3
b                 3711         3911          197        >20.0
u                 3212         3706          245         20.15 +/- 0.28
w1                4737         4936          197        >18.9
m2                4531         4731          197        >20.6
w2                4122         4321          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).