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GCN Circular 34997

Subject
GRB 231111A: Osservatorio Astronomico "Nastro Verde" optical observations with detection of an optical counterpart
Date
2023-11-12T11:03:17Z (3 months ago)
From
Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>
Via
Web form
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), 
K. Kalinowski (Aarhus University, Department of Physics and Astronomy),
B. De Simone (Universita' degli Studi Di Salerno)
report: 
Following the Swift trigger no. 1195887 (GCN 34981 A. Melandri et al) from the Swift Burst Alert Telescope (BAT), we pointed at the coordinates RA(J2000)=19h 20m 45.96s: Dec(J2000)=52d 26' 17.9" and started our observations with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy.
Member of: 
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.
AstroCampania Associazione.

The observations started at 18:00 UT of 2023/11/11, after about 4 hours after the GRB trigger, with light cloud veils that left large spaces of 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 and 26 unfiltered images of 60 sec . All images, calibrated with masterdark and masterflat have been measured with Thycho Tracker and Astrometrica software
We have detected a faint source at the enhanced position reported by Swift-XRT team (J.P. Osborne et al., GCN 34991 ) 
at following position

RA (J2000.0)   19 20 45.12
Dec (J2000.0) +52 26 10.2  

with the following photometry and astrometry:

GRB 23111 KC2023 11 11.82061 19 20 45.12 +52 26 10.2          20.4       C82




Magnitudes were estimated with the GAIA DR2 cat. and are not corrected for galactic dust extinction.

Further observations are encouraged.

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