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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17737
Message-Id: <20260403070321.917E528807D2@server.astronomerstelegram.org>
Date: Fri,  3 Apr 2026 03:03:21 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17737							     ATEL #17737

Title:	Spectroscopic classification of the bright and nearby AT2026fhw
		with MDM/OSMOS
Author:	R. B. Effress, B. T. Gebreamlak, B. O. Goldman, T. Goodman,
		J. Kalish, L. Koo, T. Lack, S. A. Lawsky, S. L. Manyan, M. Nebart,
		K. N. Oqueli-White, A. Ramadorai, N. A. Rodgers, T. A. Sabin, E. Sharman,
		C. Wu, L. Zheng, R. Zheng, N. Aftab, D. Schiminovich, K. De (Columbia
		University)
Queries:	kd3038@columbia.edu
Posted:	2 Apr 2026; 23:19 UT
Subjects:Optical, Supernovae

We report spectroscopic observations of the nearby, bright transient AT2026fhw
with OSMOS on the MDM 2.4 Hiltner telescope. The source was discovered
by the ATLAS survey (Tonry et al., TNS Report No. 294191) as a young supernova
candidate in a galaxy at z = 0.019.

We observed AT2026fhw as part of an undergraduate class training session
with the OSMOS spectrograph on the MDM 2.4m Hiltner telescope. Observations
were obtained on UT 2026-03-21 using the blue grism and the 1.2 inner slit,
providing a wavelength coverage of 4000 - 7000 Angstrom at a spectral resolution
R ~ 1000.

The data was reduced using a custom spectroscopic pipeline. The reduced
spectrum shows broad absorption features of Si II, S II and Fe II with
velocities of 11,000 km/s at the redshift of the host galaxy. The spectrum
is consistent with a normal Type Ia supernova a few days before peak brightness.

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