NOTE: uvot_fluxes_wget.pl vrs. 2023-03-23 fem at 230510d20h48m26s643022usUT
NOTE: Source region spec. is: 318.13671 34.44306 4"
NOTE: Used archived XRT position of 318.13671  34.44306  4.00
NOTE: position reference is GCN_Circulars-33756
NOTE: Possible detection in bb at T+4208.5
NOTE: Possible detection in wh at T+72.0
NOTE: Possible detection in uu at T+284.1

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

GRB 230510A: Swift/UVOT Upper Limits

A. Belles (PSU) and Eyles-Ferris (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 230510A
72 s after the BAT trigger (Eyles-Ferris et al., GCN Circ. 33752).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-33756 ***
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            72          222          147         >18.9
white               72         4613          344         >19.2
v                 4824         5023          197         >18.9
b                 4208         5690          242         >19.6
u                  284         5638          229         >18.6
w1                5233         5433          197         >18.8
m2                5028         5228          197         >19.5
w2                4619         4819          197         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.144 in the direction of the burst
(Schlegel et al. 1998).


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

GRB 230510A: Swift/UVOT Detection

A. Belles (PSU) and Eyles-Ferris (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 230510A
72 s after the BAT trigger (Eyles-Ferris et al., GCN Circ. 33752).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Circulars-33756 ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  21:12:32.90 = 318.13710 (deg.)
    Dec (J2000) = +34:26:35.8  =  34.44328 (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               72          222          147         19.14 +/- 0.10
v                 4824         5023          197        >18.9
b                 4208         4408          197         20.04 +/- 0.29
u                  284         5638          229         19.08 +/- 0.18
w1                5233         5433          197        >18.8
m2                5028         5228          197        >19.5
w2                4619         4819          197        >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.144 in the direction of the burst
(Schlegel et al. 1998).