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GCN Circular 40843

Subject

GRB 250625A: Osservatorio Astronomico "Nastro Verde" optical observations: detection of an optical counterpart

Event

Date

2025-06-26T17:11:34Z (2 days ago)

From

Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>

Via

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Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy
in a large collaboration with:
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:
 
Following the Swift trigger no. 1327910 (GCN 40825Loading...
 
  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.
Member of: 
AAVSO - American Association of Variable Star Observers.
GRB/UAI Gamma Ray Burst Section of Unione Astrofili Italiani.

The 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
I took 13 unfiltered images of 120 sec . 
   Start                 End               
19:30:01 UT            19:56:45 UT         

All images, calibrated with masterdark and masterflat have been measured with Thycho Tracker software
We have detected a faint source at the enhanced position reported by Swift Burst Alert Telescope (BAT) at following position

RA (J2000.0)   17 26 02.13
Dec (J2000.0) +22 16 07.7  

with the following photometry and astrometry:


GRB 250625A 17 26 02.13 +22 16 07.7          20.2 V       C82




Magnitudes were estimated with the ATLAS cat. and are not corrected for galactic dust extinction.



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