GCN Circular 34562
Subject
Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations
Date
2023-08-26T08:05:10Z (9 months ago)
From
Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>
Via
legacy email
U.Quadri, P.Madurini and L.Strabla (Bassano Bresciano Astronomical Observatory),
Member of:
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.
GAC - Gruppo Astrofili Cremonesi.
in a large collaboration with:
M.G. Dainotti (National Astronomical Observatory of Japan),
Y. Niino (Tokyo University, Institute of Astronomy),
K. Kalinowski (Aarhus University, Department of Physics and Astronomy),
B. De Simone (Universita' degli Studi Di Salerno)
report:
We imaged the field of Swift J1727.8-1613(GRB 230824A)
(Page et al., GCN 34537; Navaneeth et al., GCN 34538, Odeh et al., GCN 34543)
with the following telescopes:
0.25-m f/4.8 Newton reflector at Bassano Bresciano Observatory, Italy - MPC Code 565.
0.32-m f/8.0 (iTelescope) reflector at AstroCamp at Nerpio, Spain - MPC Code I89.
0.51-m f/6.8 (iTelescope) Dall-Kirkham at Rio Hurtado Valley, Chile - MPC Code X07.
We clearly detected a bright object, in the same location as M.Odeh et al., GCN 34543, within
the uncertainty radius of the Swift localization, at:
R.A. (J2000): 17:27:43.32
Dec. (J2000): -16:12:18.8
The results of our photometry are:
------------------------------------------------------
Date UT Exp Time R-mag Err IAU STATION
------------------------------------------------------
2023-08-24.7967 18x20s 13.25 0.057 565
2023-08-24.8018 18x20s 13.25 0.049 565
2023-08-24.8071 12x30s 13.24 0.048 565
2023-08-24.8124 12x30s 13.24 0.043 565
2023-08-24.8185 12x30s 13.24 0.042 565
2023-08-24.9030 10x60s 13.05 - I89
2023-08-25.1470 10x60s 12.80 - X07
------------------------------------------------------
Magnitudes were estimated with the pan-STARRS cat.
and are converted using Lupton (2005) equations.
Not corrected for galactic dust extinction.
Further observations are planned.
Reference:
http://www.osservatoriobassano.org/GRB.asp
The message may be cited.