GCN Circular 42262
Subject
GRB 251013C: Bassano Bresciano Observatory optical observations
Event
Date
2025-10-14T16:09:54Z (2 months ago)
From
Ulisse Quadri at Bassano Bresciano Observatory <osservatoriobassano@gmail.com>
Via
Web form
U.Quadri, L.Strabla and P.Madurini (Bassano Bresciano Astronomical Observatory)
Members of:
GRB/UAI - Gamma ray Burst section of Unione Astrofili Italiani.
AAVSO - American Association of Variable Star Observers.
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),
report:
We imaged the field of GRB 251013C detected by SVOM (Rakotondrainibe et al., GCN 42222), with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy .
The observations started 1h 47m after the trigger with our Newton telescope D=440 mm F/D=4.5.
We co-added series of 10 exposures of 30 sec each.
We clearly detect a bright afterglow reported by GCNs (Konno et al. (GCN circ. 42226), Perez-Garcia et al. (GCN circ. 42225), Martin-Carrillo et al. (GCN circ. 42227), Masi (GCN circ. 42228), Palmerio et al. (GCN circ. 42229), Moskvitin et al. (GCN circ. 42230), Gompertz et al. (GCN circ. 42231), Watson et al. (GCN circ. 42241), López-Cámara et al. (GCN circ. 42242), Zhang et al. (GCN circ. 42248), Brosio et al. (GCN circ. 42251), Quintana-Ansaldo et al. (GCN circ. 42254), and Maksut et al. (GCN circ. 42256)) at the following position (+/- 3 arcsec):
RA (J2000.0) = 23 03 20.5
DEC(J2000.0) = -00 12 37
We report our photometry analysis:
HJD CR Mag Err
-----------------------------
2460962.318647 15.63 0.01
2460962.318647 15.63 0.01
2460962.322293 15.67 0.01
2460962.325915 15.73 0.01
2460962.329549 15.72 0.01
2460962.333183 15.77 0.01
2460962.336817 15.84 0.01
2460962.340463 15.92 0.01
2460962.344097 15.98 0.01
2460962.347730 16.05 0.01
2460962.351307 16.12 0.01
2460962.355022 16.18 0.01
2460962.358656 16.24 0.01
2460962.362302 16.24 0.02
2460962.365947 16.24 0.02
2460962.369581 16.29 0.02
2460962.373227 16.31 0.01
2460962.376873 16.35 0.02
2460962.380507 16.37 0.02
2460962.384141 16.37 0.02
2460962.387775 16.43 0.02
2460962.391397 16.47 0.02
2460962.395032 16.54 0.02
2460962.398665 16.55 0.02
2460962.402299 16.56 0.02
2460962.405933 16.61 0.02
2460962.409568 16.64 0.02
2460962.413190 16.64 0.02
2460962.416824 16.68 0.02
2460962.420458 16.71 0.02
2460962.424092 16.78 0.02
2460962.427715 16.83 0.02
2460962.431349 16.83 0.03
2460962.434982 16.84 0.03
2460962.438617 16.98 0.03
2460962.442251 17.06 0.04
2460962.445885 17.03 0.05
2460962.449519 17.02 0.04
2460962.453153 17.09 0.04
2460962.456787 17.02 0.04
-----------------------------
CR magnitude is unfiltered with R zero point.
Magnitudes were estimated with the pan-STARRS cat and are derived using Lupton (2005) equations.
Not corrected for galactic dust extinction.
Reference:
http://www.osservatoriobassano.altervista.org
The message may be cited.