TITLE: GCN CIRCULAR NUMBER: 39204 SUBJECT: IGO/Virgo/KAGRA S250206dm: Virtual Telescope Project upper limit for the Neutrino IceCube Candidate DATE: 25/02/07 14:01:44 GMT FROM: Gianluca Masi at Virtual Telescope Project gianluca@bellatrixobservatory.org
Gianluca Masi (Virtual Telescope Project) reports:
Following up LIGO/Virgo/KAGRA S250206dm (LVKC, GCN 39175) at optical wavelengths, we managed to image the field centered at position RA = 149.16, Decl. =-17.94 and covering the complete 0.43 deg. error region reported by the IceCube Collaboration (GCN 39176), remotely using our 250mm-f/4.5 robotic astrograph installed at our facility in Manciano (GR), Italy.
We collected 35 x 120s unfiltered exposures under significant moonlight, with a total integration of 70 minutes, centered on 22:53:35 UTC, 06 Feb. 2025, about 1.5 hours after the event. A CMOS camera based on the Sony IMX455 sensor was used.
Comparing the resulting image with the POSS2, blue filter, we did not record any obvious new source, down to mag. 19.
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