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GCN Circular 33642

Subject
GRB 230414B: Swift/UVOT Detection
Date
2023-04-18T17:05:38Z (a year ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
 GRB 230414B: Swift/UVOT Detection

S. J. LaPorte (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 230414B
133 s after the BAT trigger (D'Ai et al., GCN Circ. 33612Not found
 
 
).
A fading source consistent with the optical position
(Pankov et al. GCN Circ. 33615Not found
 
 
)
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

b                        543           735             38        >19.23
m2                   1070         1089             19        >17.31
u                        287           710           265        >20.09
v                        617         1065             58        >18.53
w1                     666           859             38        >18.48
w2                     766           785             19        >17.72
white_FC          129         1015            481          20.92+-0.22
white               5056         5203            145        >20.64

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.017 in the direction of the burst
(Schlegel et al. 1998).