GCN Circular 33630
Subject
GRB 230414B: Bassano Bresciano Observatory optical observations
Date
2023-04-15T14:51:21Z (a year ago)
From
Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>
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:
http://www.osservatoriobassano.org/GRB.asp
The message may be cited.