TITLE:   GCN CIRCULAR
NUMBER:  34024
SUBJECT: GRB 230618A: Osservatorio Astronomico Nastro verde upper limit
DATE:    23/06/19 20:14:40 GMT
FROM:    Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>

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: 

We image the field of GRB 230618A detected by SWIFT (Page et al., GCN 33989)
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

Observations began at 21:02 UT on 2023/06/18, 19 hours after GRB's detection, 
with principal telescope  SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME
I took 24 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software
We have not detected any clearly visible sources, up to 20.3th magnitude with clear sky at 
RA(J2000)  = 13h 06m 24.75s
Dec(J2000) = +03d 18' 09.3"
on a field of view 23.3 x 15.7 arcmin
   Start                   End          Rlim
21:02:25 UT            21:29:28 UT      20.3





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



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