TITLE: GCN CIRCULAR NUMBER: 38575 SUBJECT: GRB 241215A: Montarrenti Observatory optical upper limit DATE: 24/12/15 23:46:31 GMT FROM: Simone Leonini at Montarrenti Observatory (Siena, Italy) s.leonini@iol.it
S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy, part of UAI/SSV-GRB section), M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy) and K. Kalinowski (Aarhus University, Department of Physics and Astronomy) report:
We performed follow-up observations of the field of GRB 241215A with the automated and remoted 0.53m Ritchey-Chretien telescope at Montarrenti Observatory (Siena, Italy, IAU code C88).
Observations were started at 2024-12-15 17:34:42 UT, 3.83 hours after burst (Mereghetti et al., GCN 38573) stacking 80x40s Rc-band CCD images.
In our preliminary analysis, we have not found any optical transient candidate within the error-box (2.5 arcmin.) of The INTEGRAL Burst Alert System position (RA 00h 42m 20.66s, Dec. +32d 31m 7.68s - J2000) down to the following 3-sigma optical upper limits:
MJD Exp. Filter UL (3-sigma) 60660.2680 80x40s Rc > 20.3
Magnitude was calibrated with the nearby PanSTARRS stars converted using Lupton (2005) equations. No correction for galactic dust extinction was applied.
The upper limit is consistent with other already reported (Lipunov et al., GCN 38572; Mohan et al., GCN 38574).
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