TITLE: GCN CIRCULAR NUMBER: 36988 SUBJECT: GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit DATE: 24/07/31 19:31:53 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 240730A (Trigger 1245636 S. B. Cenko (GSFC), P. A. Evans (U Leicester), R. A. J. Eyles-Ferris (U Leicester), K. L. Page (U Leicester) and D. M. Palmer (LANL) GCN Circular 36976) 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 22:08 UT of 2024/07/30, after about 14.20 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 20 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 19.5th magnitude with clear skies. Start T0+ End T0+ Rlim 22:08:20 UT 22:32:39 UT 19.5
We did not found any optical counterpart in the error box of the XRTcandidate.
Magnitudes were estimated with the Gaia DR2 cat. and are not corrected for galactic dust extinction.
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