GCN Circular 42101
Subject
GRB 251002A: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
Event
Date
2025-10-03T21:48:34Z (5 days ago)
From
Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, Messina, Italy <giovannicalapai@tiscali.it>
Via
Web form
Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, (Messina) Italy
Member of: GRB/UAI Gamma Ray Burst Section of Unione Astrofili Italiani.
Report:
We observed the field of GRB 251002A detected by SVOM/ECLAIRs (Saccardi et al., GCN 42060) with the 11 inches Schmidt-Cassegrain (Celestron 11) telescope F/D=6,3.
The observations were started at 2025-10-02 22:27:43 UT (approximately 2.21 hours after burst) stacking a sets of unfiltered CCD image. The observations were carried out with sky disturbed by passing clouds, and Moon (illumination: 78%, distance: 57°).
The OT was detected at the following position:
RA (J2000.0) 00h 55m 37.91s
Decl. (J2000.0) -05° 34' 01.42"
Photometry was obtained using nearby PanSTARRS stars as follows:
Observation Mid-Time T-T0 (hr) Exposure Filter Mag. Mag. err.
2025-10-02 23:08:13 UT 2.89 42x60s CR 19.16 +/-0.08
Magnitude was calibrated with the nearby PanSTARRS stars converted using Lupton (2005) equations.
No correction for galactic dust extinction was applied.
Our observations are consistent with other already reported Palmerio et al. (GCN 42061); Turpin et al. (GCN 42062); Jelinek et al. (GCN 42063); Juliá-Maroto et al. (GCN 42064); Moskvitin et al. (GCN 42065); Perez-Garcia et al. (GCN 42066); Saccardi et al. (GCN 42076); Mandarakas et al. (GCN 42077); Cao et al. (42078); Schneider et al. (GCN 42080); Pankov et al. (GCN 42081); Leonini et al. (GCN 42082); Odeh et al. (GCN 42087); Wortley et al. (GCN 42091); Shilling (GCN 42099).
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