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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17649
Message-Id: <20260207070622.C879A2880521@server.astronomerstelegram.org>
Date: Sat,  7 Feb 2026 02:06:22 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17649							     ATEL #17649

Title:	LFBOT ATeL#17646: MISTRAL photometric and spectroscopic observations
Author:	B. Schneider (LAM), C. Adami (LAM/Pytheas/AMU), S. Basa (UAR
		Pytheas), N. Globus (UNAM), A. M. Watson (UNAM), E. Le Floc&#39;h
		(CEA-Saclay), W. H. Lee (UNAM)
Queries:	globus@astro.unam.mx
Posted:	6 Feb 2026; 22:45 UT
Subjects:Transient

We observed the field of the candidate LFBOT reported by Tsuboi et al.
(ATeL #17646) and observed by Gill et al. (ATeL #17647) and Pereyra et
al. (ATeL #17648) with the MISTRAL spectro imager at the T193 telescope
of the Observatoire de Haute-Provence, France (https://ohp.osupytheas.fr/mistral-spectro-imager/)
on the night of 2026-02-06 UT.

MISTRAL imaged the position in g, r and i bands. The data were analysed
in STDWeb/STDPipe (Karpov 2025). We still detect the transient with the
following magnitudes:

r = 16.97 +/- 0.01 at 19:27 UT with a 180s exposure 
g = 16.83 +/- 0.01 at 19:37 UT with a 160s exposure 
i = 17.08 +/- 0.01 at 19:42 UT with a 270s exposure

We also used MISTRAL in spectroscopic mode to obtain two spectra, of 25
and 20 minutes each. By summing these spectra, we obtained a nearly featureless
blue spectrum, very similar to the public spectrum of AT2018cow. Using
this as a template, the best-fit redshift for the current object is approximately
0.01, strongly suggesting that we are observing an LFBOT. The absence of
emission lines also argues against a stellar origin, but we encourage continued
follow-up to confirm its nature.

We acknowledge the excellent support from the Observatoire de Haute-Provence
and in particular Jean-Pierre Troncin and the SOPHIE observer Mathilde
Timmermans.

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