{
  "submitter": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
  "bibcode": "2025GCN.40843....1R",
  "format": "text/plain",
  "subject": "GRB 250625A: Osservatorio Astronomico \"Nastro Verde\" optical observations: detection of an optical counterpart",
  "circularId": 40843,
  "submittedHow": "web",
  "createdOn": 1750957894002,
  "body": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy\nin a large collaboration with:\nM.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 \nFollowing the Swift trigger no. 1327910 (GCN 40825 M. Ferro (INAF-OAB), R. Brivio (INAF-OAB), J. J. DeLaunay (PSU),R. Gupta (NASA GSFC), J. A. Kennea (PSU), D. M. Palmer (LANL),B. Sbarufatti (INAF-OAB) and M. H. Siegel (PSU) report on behalf ofthe Neil Gehrels Swift Observatory Team) from the Swift Burst Alert Telescope (BAT), we pointed at the coordinates RA(J2000)=17h 26m 02.09s: Dec(J2000)= +22d 16' 03.5\" and started our observations with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy.\nMember of: \nAAVSO - American Association of Variable Star Observers.\nGRB/UAI Gamma Ray Burst Section of Unione Astrofili Italiani.\n\nThe observations started at 19:30 UT of 2025/06/25, after about 3.30 hours after the GRB trigger, with clear sky, with principal telescope  SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME\nI took 13 unfiltered images of 120 sec . \n   Start                 End               \n19:30:01 UT            19:56:45 UT         \n\nAll images, calibrated with masterdark and masterflat have been measured with Thycho Tracker software\nWe have detected a faint source at the enhanced position reported by Swift Burst Alert Telescope (BAT) at following position\n\nRA (J2000.0)   17 26 02.13\nDec (J2000.0) +22 16 07.7  \n\nwith the following photometry and astrometry:\n\n\nGRB 250625A 17 26 02.13 +22 16 07.7          20.2 V       C82\n\n\n\n\nMagnitudes were estimated with the ATLAS cat. and are not corrected for galactic dust extinction.\n\n\n\nThe message may be cited.",
  "eventId": "GRB 250625A"
}