AstroNotes

We present (SDSS) g&r filter (DAO) and (Kron-Cousins) B-V, V & V-R) photometric follow up observations of selected optical transients obtained using the 1.82-m Plaskett telescope of the (Dominion Ast…

This report includes classifications of 3 Type Ia's before or around peak brightness.

We report late-time Magellan/LDSS3 spectra of two SNe, SN 2017hcc and SN 2023xbg, identified as long-lived/rebrightened transients in LSST Early Data Preview 2 (EDP2). Both spectra, obtained ~3300 an…

This report includes classifications of 4 Type Ia's, 1 Type II, and 1 host dominated spectrum. We encourage followup observations.

This report includes classifications of two type II supernovae. Additionally, we present the spectrum of an object mainly dominated by the galaxy spectrum with unclear classification. Further follow …

We report a new spectroscopic observation of AT 2026aabo in M31 and classify it as an Fe II nova.

We report results on the recent faint transient AT 2026aaqs (ZTF26absfgdt), likely associated with the nearby spiral galaxy NGC 247 (at 3.3 Mpc), that is a member of the Sculptor group of galaxies.

We report the classification of optical transient ZTF26abmlfan/AT 2026yxi as a tidal disruption event (TDE). The source was selected by the tdescore ML classifier (Stein+2024, doi: 10.3847/2041-8213…

Two short apparent optical brightenings were recorded in separate H.264 video sequences centered on eta Tauri (Alcyone) on 2026-08-15 at approximately 00:17 UTC and 00:22 UTC. The observations were o…

Here we report the ATLAS discovery of the transient ATLAS26krw (AT2026aaiv) in galaxy NGC 7331 at magnitude m_o = 17.33 +/- 0.19. At a distance of 14 Mpc (redshift independent, from NED), the transie…

This report includes classifications of 5 Type Ia's

We report 4 ZTF superluminous supernova candidates selected by our software filters and subsequent human vetting. In this sample, a typical rise time is longer than 30 days and a typical peak r-band …

Here we report the ATLAS discovery of the transient ATLAS26krm (AT2026aafh) in galaxy SBS 1620+577 at magnitude m_o = 19.19 +/- 0.19. At a distance of 67 Mpc, the transient was discovered on MJD = 61…

We have cross-matched the TNS objects against a catalogue of 430,811 galaxies within 200 Mpc, assembled from GLADE+ with angular sizes drawn from HyperLEDA where available, and have begun populating …

Here we report the ATLAS discovery of the transient ATLAS26kqj (AT2026aabz) in galaxy ESO 580- G 014 at magnitude m_o = 18.44 +/- 0.20. At a distance of 88 Mpc, the transient was discovered on MJD = …

Here we report the ATLAS discovery of the transient ATLAS26koy (AT2026zyf) in galaxy UGC 00279 at magnitude, m_w = 19.27 +/- 0.28. At a distance of 83 Mpc, the transient was discovered on MJD 61280.0…

Here we report the ATLAS discovery of the transient ATLAS26koz (AT2026zyg) in galaxy 2MASXJ20352885+5135274 at magnitude, m_o = 18.05 +/- 0.12. At a distance of 46 Mpc, the transient was discovered o…

We report the discovery of a faint, uncatalogued optical transient during the follow-up observations of SVOM GRB 260822A. The field was observed with the DDRAGO imager on the SVOM/COLIBRÍ (FM-GFT) te…

We report a VLA detection of AT 2026nik at 94 days post optical peak, marking the first radio detection for this object. Its X band (10 GHz) flux density was 64 +/- 6 μJy, corresponding to a luminosi…

We present (SDSS) g&r filter photometric follow up observations of selected optical transients obtained using the 1.82-m Plaskett telescope of the (Dominion Astrophysical Observatory) National Resear…

We present (SDSS) g&r filter photometric follow up observations of selected optical transients obtained using the 1.82-m Plaskett telescope of the (Dominion Astrophysical Observatory) National Resear…

Report of a rapidly rising early SNIa candidate (ZTF26abohdvv) pending urgent spectroscopic confirmation.

A spectrum was taken with the Nordic Optical Telescope (NOT) of the transient AT 2026yos, which was highlighted as a potential kilonova candidate by Gillanders et al. (AstroNote 2026-245). Our spectr…

AT2026xkp (Rubin pipeline ID diaObjectId:170587117752680534) was discovered on 2026‑06‑26 and registered with the TNS. The transient has a discovery bibcode (2026TNSTR3165....1S) but remains unclassi…

We report 3 SLSN and 1 TDE candidates from the ZTF public alert stream, identified by the NEEDLE classifier running on the Lasair alert broker. We encourage spectroscopic classification of these even…

Here we report the ATLAS discovery of the transient ATLAS26jyd (AT2026ywa) in galaxy ESO186-G021 at magnitude m_o = 19.22 +/- 0.15. At a distance of 76.65 Mpc, the transient was discovered on MJD = …

We spectroscopically classify the optical transient AT2026yqj/ZTF26abgtqqr as a TDE-He at redshift z=0.1565. In addition, we classify the long-rising nuclear transient AT 2026rey/ZTF26aaximsq as a po…

We report multiband photometric follow-up observations of AT 2026yos (ATLAS26jvy), a rapidly fading transient discovered by ATLAS (Gillanders et al., AstroNote 2026-245). We observed the transient wi…

Here we report the ATLAS discovery of the transient ATLAS26jvy (AT2026yos) in galaxy NGC6379 at AB magnitude, m_w = 18.53 +/- 0.04. At a distance of 87 Mpc, the transient was discovered on MJD 61262…

We present (SDSS) g&r filter photometric follow up observations of selected optical transients obtained using the 1.82-m Plaskett telescope of the (Dominion Astrophysical Observatory) National Resear…

We report spectroscopic observations with Keck/DEIMOS of old (~1-9 years post-explosion) type II supernovae detected by the Rubin/LSST, some of which are powered by on-going CSM interaction.

Here we report the ATLAS discovery of the transient ATLAS26jsq (AT2026yid) in galaxy ESO 234- G 013 at magnitude m_o = 17.56 +/- 0.12. At a distance of 73 Mpc (redshift independent, from NED), the tr…

We report the prior identification of late-time mid-infrared rebrightening in SN 2020jfv and SN 2020izc with WISE/NEOWISE, more than two years before their optical rebrightening in LSST EDP2. Persist…

We reclassify SN 2026sqf as a Type Ia-CSM SN, affirming the original proposal by Midavaine et al. (AstroNote 2026-230). Our NOT/ALFOSC spectra reveal features characteristic of Type Ia SNe (Fe III & …

We present followup observations of the fast evolving, blue and luminous transient SN 2026wpd. The light curve shows a rapid rise to an absolute magnitude of ~ -19 in ~6 days. The LT spectrum display…

We report the identification of 8 candidate transient precursors and 13 transients exhibiting unusually long-lived emission, late-time light-curve flattening, or rebrightening in LSST EDP2 coadded im…

We present (SDSS) g&r filter (DAO) and (Kron-Cousins) B-V, V & V-R) photometric follow up observations of selected optical transients obtained using the 1.82-m Plaskett telescope of the (Dominion As…

We report the recent explosion of precursor candidate AT2026sfn as a Type IIn supernova, confirming the prediction made in the previous “Precursor Watch” Astronote 2026-217.

Here we report the ATLAS discovery of the transient ATLAS26jiy (AT2026wpd) in galaxy CGCG 537-004 at magnitude m_o = 18.26 +/- 0.16. At a distance of 100 Mpc, the transient was discovered on MJD = 61…

Here we report the ATLAS discovery of the transient ATLAS26jja (AT2026wsy) in galaxy IC 4682 at magnitude m_o = 18.67 +/- 0.17. At a distance of 45 Mpc (redshift independent, from NED), the transient…

We report on the optical photometric follow-up of AT 2026rdg conducted with the BHTOM.space Global Telescope Network.

We report observations of the red and fast fading transient AT2026wki/ZTF26abkoycd, identified in the ZTF alert stream. The transient faded by ~1.1 mag/day in g-band and its color is red (g-r~0.2 mag…

We report the classification of the bright nuclear transient 2026plb/ZTF26abbwmoo as a SN type IIn.

We report on the optical photometric follow-up of SN 2026sqf with RAPAS, a ProAm network using telescopes equipped with a set of filters RAPAS G, RAPAS Gbp and RAPAS Grp meeting Gaia G, Gbp and Grp p…

We report the ongoing evolution of the bright, spectroscopically featureless nuclear transient ZTF26abbwmoo/AT 2026plb.

Here we report the ATLAS discovery of the transient ATLAS26iur (AT2026ved) in galaxy ESO119-G037 at magnitude m_o = 18.05 +/- 0.08. At a distance of 83 Mpc, the transient was discovered on MJD = 6123…

Here we report the ATLAS discovery of the transient ATLAS26ivj (AT2026vek) in galaxy 2MASS J12202804+4826508 at magnitude m_w = 18.27 +/- 0.17. At a distance of 103 Mpc, the transient was discovered …

Here we report the ATLAS discovery of the transient ATLAS26iuo (AT2026veb) in galaxy MCG-03-34-076 at magnitude m_o = 18.75 +/- 0.16. At a distance of 100 Mpc, the transient was discovered on MJD = 6…

Here we report the ATLAS discovery of the transient ATLAS26iup (AT2026vec) in galaxy CGCG 098-034 at magnitude m_o = 18.41 +/- 0.16. At a distance of 93 Mpc, the transient was discovered on MJD = 612…

Here we report the ATLAS discovery of the transient ATLAS26irw (AT2026vbh) in galaxy MCG -02-04-031 at magnitude m_o = 18.02 +/- 0.08. At a distance of 72 Mpc, the transient was discovered on MJD = 6…