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From: atel@astronomerstelegram.org
Subject: ATel  17436
Message-Id: <20251007070620.A0D7F2880977@server.astronomerstelegram.org>
Date: Tue,  7 Oct 2025 03:06:20 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17436							     ATEL #17436

Title:	V462 Lup has entered the super-soft X-ray phase 
Author:	G. J. M. Luna (UNAHUR/CONICET/Argentina), K. L. Page (U. Leicester),
		N. P. M. Kuin (MSSL), Isabel de J. Lima (UNESP/Brazil), Claudia V.
		Rodrigues (INPE/Brazil) and N. E. Nunez (ICATE/UNSJ/Argentina)
Queries:	juan.luna@unahur.edu.ar
Posted:	6 Oct 2025; 19:07 UT
Subjects:X-ray, Nova

V462 Lup (Nova Lupi 2025; ASASSN-25cm; AT 2025nlr) was discovered as a
bright nova on 2025 June 12 at 20:52:48 UT (https://www.wis-tns.org/object/2025nlr).

Since then the Neil Gehrels Swift Observatory regularly observed it and
detected an X-ray source on August 22 2025. Combining further observations
obtained until September 18 2025, we found a mean count rate of 0.0076
+/- 0.0011 counts/s. This spectrum can be modeled with an absorbed optically-thin
plasma with kT > 1.3 keV, NH = 7.4 +9.0/-4.1 e22 cm^-2 and unabsorbed flux
in the 0.3-10 keV energy range of 1.23e-12 erg/s/cm^2.

A new Swift/XRT observation obtained on October 4 2025 revealed a new super-soft
X-ray component at a count rate of 0.024 +0.004/-0.003 count s^-1 that
can be modeled with a combination of an absorbed blackbody-like optically
thick X-ray emission plus an optically thin thermal plasma, with parameters
kT > 7 keV, BB kT = 30 +14/-8 eV, NH=7.12e20 cm^-2 and unabsorbed flux
in the 0.3-10 keV energy range of 3.56e-12 erg cm^-2 s^-1.

The Swift/UVOT observation yielded a magnitude in the UVW2 filter of 10.97
+/- 0.03 (stat) +/- 0.03 (sys). The ultraviolet spectrum is similar but
overall weaker than that obtained on August 22 2025 and reported in Page
et al. (Atel #17353).

Unfortunately, the source is going into Sun constraint for Swift until
December 30 2025, so further observation will be requested  by then. We
thank the Swift PI, Brad Cenko, and his deputies for approving the time,
as well as the Swift planning and operations teams for their continuing
support.

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Password Certification: Gerardo Juan Manuel Luna (juan.luna@unahur.edu.ar)
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