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From: atel@astronomerstelegram.org
Subject: ATel  17951, 17952, 17953
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Date: Mon, 10 Aug 2026 03:07:33 -0400 (EDT)

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ATEL #17951							     ATEL #17951

Title:	Detection of Superhumps during a Superoutburst in Gaia20ffw
Author:	D. Yu. Rusanova (ASPD TShNU of Kyiv), F.-J. Hambsch (VVS,
		GEOS, BAV), A. O. Simon  (ASPD TShNU of Kyiv), P. J. Mikolajczyk (U.
		Wroclaw/NCBJ, PL), L. Wyrzykowski (U. Warsaw/NCBJ, PL/EASST. eu),
		K. Kotysz (U. Wroclaw/U. Warsaw, PL)
Queries:	andrii.o.simon@gmail.com
Posted:	9 Aug 2026; 08:57 UT
Subjects:Optical, Request for Observations, Cataclysmic Variable,
		Transient, Variables

We report the detection of superhumps during a superoutburst in the cataclysmic
variable <a href = 'https://bhtom.space/public/targets/Gaia20ffw'>Gaia20ffw</a>/AT2020znz/ASASSN-18jq,
which was detected by our Outbursts Alerting System.

The BHTOM long-term light curve of <a href = 'https://bhtom.space/public/targets/Gaia20ffw'>Gaia20ffw</a>
indicates that the object exhibits two distinct types of outbursts: relatively
short normal outbursts and longer, brighter events that are likely superoutbursts.
A new outburst was detected in the BHTOM light curve of the object beginning
on 2026 August 1. The Outbursts Alerting System informed us that Gaia20ffw
remained in an elevated-brightness state on August 5, indicating that the
event had already lasted for at least four days. The long duration of the
event suggested that Gaia20ffw might be undergoing a superoutburst. <a
href = 'http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/27614'>VSNET-Alert
#27614</a> suggested that ASASSN-18jq(Gaia20ffw) might be an SU UMa star.

Time-resolved photometric observations were therefore performed with the
C14 f/7 telescope at Franz-Josef Hambsch's Remote Observatory Atacama Desert
(ROAD) in Chile to search for superhumps, the characteristic photometric
signature of SU UMa-type superoutbursts.

The observations covered the interval from MJD 61260.06284 to 61260.17119,
corresponding to approximately 2.6 hours. The resulting light curve (<a
href = 'http://aosimon.org.ua/sites/all/files/Gaia20ffw_LCandLSP.jpeg'>Fig.
1</a>) clearly shows superhumps with a period of 0.0801(55)<sup>d</sup>
and a peak-to-peak amplitude of about 0.2<sup>m</sup> (<a href = 'http://aosimon.org.ua/sites/all/files/Gaia20ffw_Zgortka.jpeg'>Fig.
2</a>). The superhump period was determined using a Lomb–Scargle periodogram
implemented in scipy.signal.lombscargle. The phase-folded light curve also
shows a possible secondary hump around phase 0.3. These results confirm
that Gaia20ffw is an SU UMa-type dwarf nova.

Further observations are strongly encouraged. Observers are invited to
upload their observations to the object's BHTOM page, where all submitted
data are automatically processed: <a href = 'https://bhtom.space/public/targets/Gaia20ffw'>https://bhtom.space/public/targets/Gaia20ffw</a>.

BHTOM is based on the open-source <a href = 'https://lco.global/tomtoolkit/'>TOM
Toolkit by LCO</a> and has been developed with funding from the OPTICON-RadioNet
Pilot (ORP) of the European Union's Horizon 2020 research and innovation
programme under grant agreement No <a href = 'https://cordis.europa.eu/project/id/101004719'>101004719</a>
(2021-2025). This project has received funding from the European Union's
Horizon Europe Research and Innovation programme ACME under grant agreement
No <a href =  'https://cordis.europa.eu/project/id/101131928'>101131928
(2024-2028)</a>.

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Password Certification: Andrew Simon (skazhenijandrew@gmail.com)
https://www.astronomerstelegram.org/?read=17951
==============================================================================
ATEL #17952							     ATEL #17952

Title:	Optical spectroscopic followup of AT2026nwl/EP260530a
Author:	Christophe Adami (LAM/Pytheas/AMU), Stephane Basa (UAR Pytheas),
		Noemie Globus (UNAM), Alan M. Watson (UNAM)
Queries:	christophe.adami@lam.fr
Posted:	9 Aug 2026; 14:31 UT
Subjects:Optical, Transient

We report an optical spectroscopic followup of AT2026nwl/EP260530a. Originally

reported/characterized by Wu et al. (ATEL #17824), Wen et al. 
(ATel #17825), Globus et al. (https://gcn.nasa.gov/circulars/44759), Zheng
et al. (https://gcn.nasa.gov/circulars/44775), Guelfand et al. 
(https://gcn.nasa.gov/circulars/44776), see also Junjie-Jin (https://gcn.nasa.gov/circulars/44782),

it was also spectroscopically characterized by Godson et al.  
(https://www.wis-tns.org/object/2026nwl) on the 2026-05-31 with LT/SPRAT.

We observed it ourselves two times with the MISTRAL spectro-imager using
the T193cm telescope  
at Observatoire de Haute-Provence (France) on the 2026-06-02 (15min exposure
time) and on the  
2026-07-03 (30min exposure time).

MISTRAL spectrum of 2026-06-02 is very similar to the original spectrum
of Godson et al., showing  
HeI@7065A, Halpha@6563A, HeI@5876A, HBeta@4861A, HeII@4686A at z~0. HGamma@4340A
however seems to  
have disappeared between 2026-05-31 and 2026-06-02 (even if located in
a low efficiency 
spectral domain of MISTRAL).

MISTRAL spectrum of 2026-07-03 (roughly one month later) is different.
The magnitude of the  
object is significantly fainter, and while the continuum is still decreasing,
nearly every signs  
of emission line has disappeared. Only Halpha is remaining at a low S/N.

We acknowledge the excellent support from Observatoire de Haute-Provence
and in particular  
Jean Balcaen, Yoann Degot-Longhi Larralde Erasun, Stephane Favard, and
Jean Pierre Troncin. 
We also thank Jerome Schmitt and Jean Claude Brunel for the MISTRAl upgrade.

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Password Certification: Christophe Adami (christophe.adami@lam.fr)
https://www.astronomerstelegram.org/?read=17952
==============================================================================
ATEL #17953							     ATEL #17953

Title:	Spectroscopic Classifications of Optical Transients with the
		Lick Shane telescope
Author:	 Kishore C. Patra, Ryan J. Foley (UCSC)
Queries:	kcpatra@ucsc.edu
Posted:	10 Aug 2026; 02:27 UT
Subjects:Optical, Supernovae, Transient

We report the following classifications of optical transients from spectroscopic
observations with the Kast spectrograph on the Shane telescope. The targets
were supplied by Pan-STARRS and GOTO. Observations were made on 2026 August
09 UT. Classifications were performed with SNID (Blondin & Tonry, 2007,
ApJ, 666, 1024).

Name		 | IAU Name 	| RA (J2000)	| Dec (J2000)	|   z      | Type     | Phase
| Notes 
PS26fjj 	 | AT2026vjl 	| 16:16:34.539	| +20:55:15.14	| 0.077	   | SN Ia
|   3 d  | (1) 
GOTO26hqg	 | AT2026xaq 	| 20:23:39.234  | +11:42:39.36  | 0.05	   | SN
Ia    |  -7 d  | (2)

Notes: 
When the redshift is given to 2 decimal places, it is derived from the
SN spectrum.  Otherwise, the redshift is determined from the host galaxy.

(1) We measure Si II 6355 velocity of  -10,400 km/s.  
(2) We measure Si II 6355 velocity of  -12,500 km/s.

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Password Certification: Kishore Patra (kcpatra@ucsc.edu)
https://www.astronomerstelegram.org/?read=17953
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