TITLE:   GCN CIRCULAR
NUMBER:  37285
SUBJECT: SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
DATE:    24/08/25 20:39:10 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 imaged the field of the soft gamma repeater  SGR 1E 1841-045 / Kes 73 (trigger=1249878) (S. Dichiara (PSU) and D. M. Palmer (LANL) GCN 37222) with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. 
Member of: 
AAVSO - American Association of Variable Star Observers.
UAI - Unione Astrofili Italiani/GRB Section


The observations started at 20:57 UT of 2024/08/21, after about 30 minutes after the transient, with clear sky, with principal telescope  SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME
I took 23 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 19.0th magnitude with clear skies.
 Start                       End        Rlim
20:57:07 UT               21:14:48 UT   19.0

We did not found any optical counterpart.




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



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