GCN Circular 46139
Subject
GRB 261029A: Calapai Observatory, Massa S. Giorgio (Messina), optical observation
Event
Date
2026-11-03T17:48:49Z (2 days ago)
From
Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, Messina, Italy <giovannicalapai@tiscali.it>
Via
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Report:
We observed the field of GRB 261029A detected by Fermi (Fermi GBM Team, GCN 46071) and SVOM (Goto et al., GCN 46072), with the 14 inches Schmidt-Cassegrain (Celestron 14) telescope F/D=7.
The observations were started at 2026-10-29 22:15:28 UT (approximately 20.81 hours after burst) stacking a sets of unfiltered CCD image. The observations were carried out with clear skies, fair visibility conditions and Moon (illumination: 81%, distance: 66°).
The OT was detected at the following position (err. +/- 0.8"):
RA (J2000.0) 00h 35m 16.57s
Decl. (J2000.0) +34° 29' 53.7"
Photometry was obtained using nearby PanSTARRS stars as follows:
Observation Mid-Time T-T0 (hr) Exposure Filter Mag. Mag. err.
2026-10-29 23:26:36 UT 21.99 135x60s CR 20.25 +/-0.18
The magnitude was calibrated and converted using the equations of Lupton (2005).
No correction for galactic dust extinction was applied.
Our observations are consistent with other already reported O'Neill et al. (GCN 46073); He et al. (GCN 46078); Wang et al. (GCN 46079); De et al. (GCN 46080); Cotter et al. (GCN 46081); Álvarez et al. (GCN 46083); Yin et al. (GCN 46084); Shi et al. (GCN 46088); Kang et al. (GCN 46090); Ma et al. (GCN 46092); De et al. (GCN 46093); Novotny et al. (GCN 46097); Zhao et al. (GCN 46099); Dimple et al. (GCN 46101); Novotny et al. (GCN 46102); Rodríguez-Torres et al. (GCN 46103); Hua et al. (GCN 46104); Yin et al. (GCN 46109); Kang et al. (GCN 46113); Moskvitin et al. (GCN 46133).
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