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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17795, 17796, 17797
Message-Id: <20260513070747.D898028807CF@server.astronomerstelegram.org>
Date: Wed, 13 May 2026 03:07:47 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17795							     ATEL #17795

Title:	Ongoing optical flare of the blazar B2 1420+32
Author:	Grishina T. S.,  Larionova E. G., Troitskiy  I. S., Shishkina
		E. V., Savchenko S. S. (Saint Petersburg State University)
Queries:	savchenko.s.s@gmail.com
Posted:	12 May 2026; 09:57 UT
Subjects:Optical, Blazar

We report an ongoing optical flare of the blazar B21420+32 (z=0.681). This
source is regularly monitored in the framework of the GASP/WEBT project
(WEBT; https://www.oato.inaf.it/blazars/webt/). The source has shown broadband
activity in recent months (see ATEL #17654, #17745, #17782, #17792).

Observations with the LX-200 40-cm telescope of the Saint Petersburg University
from May 6 to May 12 (UT) recorded:

JD=2461166.4043 R=14.609 +/- 0.012 (linear polarization degree is PD=13.4%
+/- 0.3)

JD=2461168.4287 R=14.189 +/- 0.007 (linear polarization degree is PD=12.5%
+/- 0.2)

JD=2461169.3741 R=13.968 +/- 0.007 (linear polarization degree is PD=12.5%
+/- 0.2)

JD=2461172.4759 R=13.354 +/- 0.019

We plan to continue the monitoring of this object and strongly encourage
further multi-wavelength coverage. The nightly updated light curve for
this object can be found on our website <a href="https://vo.astro.spbu.ru/program/">website</a>.

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Password Certification: Sergey Savchenko (savchenko.s.s@gmail.com)
https://www.astronomerstelegram.org/?read=17795
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ATEL #17796							     ATEL #17796

Title:	ASKAP VAST observations of SPT-SV J222602.8-540533
Author:	Akash Anumarlapudi (UNC-CH), David Kaplan (UWM), Kovi Rose
		(U. Sydney) and Tara Murphy (U. Sydney), on behalf of the VAST collaboration.
Queries:	akasha@unc.edu
Posted:	12 May 2026; 13:41 UT
Subjects:Radio, Millimeter, Transient, Variables

SPT-SV J222602.8-540533 (ATel #17781) was discovered as a millimeter (mm)
transient by the South Pole telescope (SPT) on 2026 April 13 UT. The source
exhibited flaring behavior with a inverted spectrum (brighter at 150 GHz
than 95 GHz) suggesting that the transient might be self-absorbed at lower
frequencies. Here we report the serendepitous 0.9 GHz observations from
Variables And Slow Transients Survey (VAST; Murphy et al. 2021) survey,
taken at the Australian SKA Pathfinder (ASKAP).

VAST covered the position of this source roughly with a two month cadence
over a multi-year baseline. A point source was consistently detected in
all the observations (see light curve below), within the error circle of
the SPT source. With a flux density of 2 mJy at 0.9 GHz, the radio source
appears to be persistent in the VAST data. The latest VAST observation
taken on April 13, 2026 at 23:42 UTC, probably just after the discovery
of the transient, indicates that the 0.9 GHz light is still dominated by
the persistent source. Archival multi frequency ASKAP observations at 1.37
GHz, and 1.7 GHz indicate that the spectrum of the persisent radio source
is consistent with being flat (power law index of 0).

VAST will continue to monitor this field with a two-month cadence.

This work uses data obtained from Inyarrimanha Ilgari Bundara / the Murchison
Radio-astronomy Observatory. CSIRO’s ASKAP radio telescope is part of
the Australia Telescope National Facility (https://ror.org/05qajvd42).
Operation of ASKAP is funded by the Australian Government with support
from the National Collaborative Research Infrastructure Strategy. ASKAP
uses the resources of the Pawsey Supercomputing Research Centre. Establishment
of ASKAP, Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy
Observatory and the Pawsey Supercomputing Research Centre are initiatives
of the Australian Government, with support from the Government of Western
Australia and the Science and Industry Endowment Fund.

VAST light curve for this event can be obtained here: https://www.vast-survey.org/assets/images/SPT-SV_J222602.8-540533_vast_lc.pdf
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Password Certification: Akash Anumarlapudi (akasha@unc.edu)
https://www.astronomerstelegram.org/?read=17796
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ATEL #17797							     ATEL #17797

Title:	Discovery of a Probable Nova in M31, M31N 2026-05a
Author:	K. Hornoch (Ondrejov), M. Myslivec (HVBO, Czech Republic),
		H. Kucakova (Ondrejov), A. W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	12 May 2026; 21:58 UT
Subjects:Optical, Nova, Transient

We report the discovery of a probable nova in M31 on a co-added 7800-s
H_alpha CMOS frame taken on 2026 May 10.030 UT with the 0.4-m telescope
at Belec nad Orlici (HVBO). Subsequently, we found the new object faintly
visible also on several prediscovery H_alpha and R-band images taken at
the HVBO and with the 0.65-m telescope at Ondrejov (D65), respectively.
There is nothing visible at the position of the object down to H_alpha
= 19.0 mag on a high-quality image taken on 2021 Dec. 22.772 UT at the
HVBO.

The object was designated as M31N 2026-05a = PNV J00424745+4116585 and
is located at R.A. = 0h42m47s.45, Decl. = +41o16'58".5 (equinox 2000.0),
which is 35.2" east and 50.0" north of the center of M31 (see link to discovery
image below).

The following magnitudes were obtained using the 0.4-m telescope (HVBO)
and the 0.65-m telescope (D65):

<span class="inner-pre" style="font-size: 13px"> 
Date [UT]    |  Mag   | Err  | Filter  | Telescope

2021-12-22.772 | >19.0  |      | Ha      | HVBO 
2026-04-10.095 |  16.5  | 0.3  | Ha      | HVBO 
2026-04-30.061 |  16.6  | 0.15 | Ha      | HVBO 
2026-05-01.080 |  18.6  | 0.3  | R       | D65 
2026-05-02.075 |  18.7  | 0.2  | R       | D65 
2026-05-10.030 |  16.8  | 0.1  | Ha      | HVBO

</span>

As with all extragalactic novae, follow-up spectroscopic and photometric
observations to confirm the nova's nature and determine its spectroscopic
class and rate of decline (speed class) are encouraged.

Discovery image: http://www.asu.cas.cz/~asteroid/PNVJ00424745+4116585.png
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