{
  "bibcode": "2025GCN.39553....1L",
  "body": "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:\n\nwe observed the field of the X-ray transient EP250302a (Einstein Probe mission, Trigger ID 01709132186) with the automated and remoted 0.53m Ritchey-Chretien telescope at Montarrenti Observatory (Siena, Italy, IAU code C88).\nThe observations were started at 2025-03-02 20:40:11 UT (approximately 5 hours after the EP-WXT trigger) stacking 50x40s calibrated Rc-band CCD images.\n \nWe detect an optical transient candidate at the position reported by Zhu et al. (GCN 39550). Preliminary photometry was obtained using nearby PanSTARRS stars as follows: \n\nObservation Mid-Time  \tT-T0 (hr)       Exposure        Filter      Mag.       Err.\n2025-03-02 20:57:42 UT \t  5.35\t   \t 50x40s\t\t Rc        20.36     +/-0.08\n\nconsistent with other observation reported by Busmann et al., GCN 39551.\n\nMagnitude was calibrated with the nearby PanSTARRS stars converted using Lupton (2005) equations. No correction for galactic dust extinction was applied.\n\nFurther observations are ongoing.\n",
  "submitter": "Simone Leonini at Montarrenti Observatory (Siena, Italy) <s.leonini@iol.it>",
  "circularId": 39553,
  "submittedHow": "web",
  "createdOn": 1740956733156,
  "eventId": "EP250302a",
  "format": "text/plain",
  "subject": "EP250302a: Montarrenti Observatory optical detection"
}