GCN Circular 46017
Subject
EP261015a: MAO/AZT-22 optical observations
Event
Date
2026-10-24T07:26:30Z (4 days ago)
From
Yodgor Rajabov at UBAI <rajabov@astrin.uz>
Via
Web form
O. Burkhonov, Y. Rajabov, B.Abidkhanov, S. Ehgamberdiev, Y. Tillayev (UBAI), A. Shaymanov, T. Boyqobilov (Maidanak Observatory/UBAI) report on behalf of UBAI team.
We observed the field of EP261015a (Li et al., GCN 45956) with the AZT-22 1.5m telescope of the Maidanak Observatory (MAO) starting on 2026-10-20 at 20:35:08 UT. In total we obtained 8x300s exposures in the V-band and 6x300s exposures in the R-band frames using 4kx4k CCD SNUCAM camera (Im et al., 2010).
We detect the optical counterpart in our stacked frames (Corcoran et al., GCNs 45955 and 45972; Li et al., GCNs 45956 and 45969; Méndez et al., GCN 45960; Ma et al., GCN 45963; Mohan et al., GCN 45967; Fortin et al., GCN 45991; Volnova et al., GCN 45997; Pawar et al., GCNs 45998 and GCN 46006; Shivaprasad et al., GCN 46000; Pankov et al., GCN 46003; Gou et al., GCN 46009).
Preliminary photometry is as follows:
Date UTstart Exptime Filter OT Err. UL SNR Site/Telescope
(nxs)
2026-10-20 20:35:08 8x300 V 22.68 0.13 23.27 7.48 MAO/AZT-22
2026-10-20 21:22:05 6x300 R 22.02 0.13 22.63 7.55 MAO/AZT-22
All the data have been reduced by a single data processing pipeline, STDWeb (Karpov 2025). Images obtained in Johnson Cousins filters were calibrated using the Gaia DR3 Synphot catalog and template subtracted with Legacy Survey DR10 catalog. Our measurements in Vega magnitude system and the data has not corrected for the Galactic extinction.
Maidanak astronomical observatory (MAO) is an observational facility of the Ulugh Beg Astronomical Institute (UBAI), Uzbekistan Academy of Sciences (http://maidanak.uz/