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GCN Circular 33630

GRB 230414B: Bassano Bresciano Observatory optical observations
2023-04-15T14:51:21Z (a year ago)
Ulisse Quadri at Bassano Bresciano Obs <>
U.Quadri, L.Strabla report:

We imaged the field of GRB 230414B detected by SWIFT(trigger 1164180)
with the robotic telescope of (IAU station 565) Bassano Bresciano 
Observatory, Italy. Member of: 
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.

The observations started 236.82 min min after the GRB trigger, at the end of twilight, 
with our Newton telescope D=250 mm F/D=4.8.

We co-added 6 series of 30 exposures of 60 sec each.

Start T0+      End T0+      Vlim
236.82 min   323.07 min     20.5

We detected a (fading) afterglow in the error box of the XRTcandidate.
A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), et al.
at the following position (+/- 2 arcsec):

RA (J2000.0) =  12h 04m 22.64s 
DEC(J2000.0) = +53�� 09' 16.4"

The results of our photometry are:

    Date UT               CR-mag   
    Middle                  +/- 0.05
2023 04 14.85273            19.76
2023 04 14.86022            19.74
2023 04 14.86771            19.76
2023 04 14.87519            20.02
2023 04 14.88268            19.96
2023 04 14.89017            20.01


Magnitudes were estimated with the UCAC4 cat. and 
are not corrected for galactic dust extinction.

The images are available at:

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