AstroNotes

This report includes classifications of 3 transients.

We have obtained an optical spectrum of SN 2021fwa, which shows it to be a young Type II supernova.

This report includes classifications of 3 transients.

We identify SN 2021flc as a SLSN-I candidate.

This report includes classifications of 5 transients.

We report spectroscopic classification of AT2021fom as a SN Ia.

We observed the fast optical transient ZTF21aapkbav/AT2021gca (Andreoni et al., AstroNote 2021-89; Chen et al., AstroNote 2021-92) with the Gemini North telescope equipped with the GMOS instrument (p…

Spectroscopy from the Liverpool Telescope shows AT2021gmj to be a young Type II supernova. The spectrum of AT2021gno is blue and featureless.

We observed AT 2021gca (ZTF21aapkbav) with the Lulin One-meter Telescope, Taiwan. We confirmed that the object is fading 0.3 mag per day in r-band since the discovery. The current magnitude r = 20.70…

We report the ZTF discovery of ZTF21aaqhhfu / 2021gno and ZTF21aaqgmjt / 2021gmj - two young supernova in the nearby galaxies NGC 4165 (z=0.0062,~46 Mpc) and NGC 3310 (z=0.0033,~13.1 Mpc). AT 2021gno…

We are carrying out the "Pan-STARRS Search for Kilonovae" which is a focused search for intrinsically faint transients, or rapidly evolving transients in galaxies which are closer than 200 Mpc in the…

We report the discovery of the fast, low-luminosity optical transient ZTF21aapkbav/AT2021gca with the Zwicky Transient Facility (ZTF). ZTF21aapkbav was first detected on 2021-03-17 09:23 UT at r=19…

Here we report the ATLAS discovery of the transient ATLAS21iid (AT2021gdz) in galaxy KUG 1150+203 at magnitude m_c = 18.39 +/- 0.08. At a distance of 93 Mpc, the transient was discovered on MJD = 59…

Here we report the classification of AT 2021esi as a Type IIb SN.

We draw attention to the unusual lightcurve of AT2021esi from the combined ZTF and ATLAS survey data and Pan-STARRS1 observations. AT2021esi shows a rapidly rising and fast declining (1.5 mag in 10 d…

Here we report the ATLAS discovery of the transient ATLAS21iap (AT2021fpm) in galaxy MCG -02-51-008 at magnitude m_o = 16.69 +/- 0.04. At a distance of 81 Mpc, the transient was discovered on MJD = …

This report includes classifications of 5 transients.

We report the UV and X-ray detection of optical tidal disruption event (TDE) ZTF20acyydkh/AT2021ack.

This report includes the classification of AT 2021bxg as a Type IIn SN.

This report includes classifications of 7 transients.

We report ten ZTF superluminous supernova candidates selected by our software filter and subsequent vetting. In this sample, a typical rise time is about 50 days and a typical peak r-band magnitude i…

This report includes the classification of AT 2021dwg as a Type Ic SN.

We report on optical observations of the fast blue transient ZTF21aakilyd/AT2021csp performed with Campo Imperatore Telescope.

We draw attention to the intrinsically faint and fast fading lightcurve of AT2021den from the combined Pan-STARRS and ATLAS survey data. It had a measured peak at M_w = -15.0 and a decline rate of 0…

Motivated by recent discovery and classification reports of transients with spectra showing prominent narrow emission lines of carbon and/or oxygen, but lacking lines of hydrogen and helium, we propo…

We have obtained an optical spectrum of SN 2021crx, which shows it to be an unusually luminous member of the class of low-velocity Type II supernovae.

Here we report the ATLAS discovery of the transient ATLAS21grj (AT2021dnn) in galaxy NGC 0304 at magnitude o = 15.71 +/- 0.03. At a distance of 65 Mpc, the transient was discovered on MJD = 59267.23 …

We have detected radio emission from the hydrogen-poor super-luminous supernova 2020tcw at 64 days post discovery.

This report includes the classification of one Type Ia SN at pre-maximum.

We have obtained an optical spectrum of SN 2021ckj, which shows it to be an unusual Type I supernova with narrow carbon and helium lines superimposed on a blue continuum with several broad spectral f…

Here we report the ATLAS discovery of the transient ATLAS21gks (AT2021dct) in galaxy NGC 1207 at magnitude o = 19.31 +/- 0.17. At a distance of 64 Mpc, the transient was discovered on MJD = 59262.22 …

Here we report the ATLAS discovery of the transient ATLAS21ghj (AT2021dch) in galaxy WISEA J130523.61+293037.2 at magnitude c = 18.42 +/- 0.08. At a distance of 88 Mpc, the transient was discovered o…

This report includes classifications of 3 normal Type Ia SNe, one SN Ia-91T, one young Type II SN showing flash features, and one object was classified as a CV.

Here we report the ATLAS discovery of the transient ATLAS21gfy (AT2021dbg) in galaxy MCG -01-24-014 at magnitude m_c = 18.13 +/- 0.06. At a distance of 92 Mpc, the transient was discovered on MJD = …

We report the detection of 6 GHz radio emission from the hydrogen-poor super-luminous supernova 2017ens

Here we report the ATLAS discovery of the transient ATLAS21flz (AT2021cwc) in galaxy UGC 03502 at magnitude c = 18.25 +/- 0.09. At a distance of 90 Mpc, the transient was discovered on MJD = 59258.38…

We report UV/optical and X-ray observations of the fast, luminous blue transient ZTF21aakilyd/AT2021csp.

We have obtained an optical spectrum of SN 2021cdw, which shows it to be a young Type II supernova.

We report the discovery of ZTF21aakilyd (AT 2021csp), a rapidly-rising and luminous (M ~ -20) blue transient at z=0.081. A Liverpool Telescope spectrum obtained shortly following the discovery is fe…

This report includes classifications of 3 Type Ia SNe and 1 Type II SN. For AT2021ckl the observed spectrum is consistent with only host galaxy light. The acquisition image of ZTF21aajezvp did not sh…

This report includes classifications of 3 Type Ia SNe, 2 Type II SNe, and 1 Type Ic SN.

We report the discovery of ZTF21aaiaqhh / 2021can - a rapidly rising young supernova in the nearby galaxy (z=0.0207, ~90 Mpc). The transient was discovered on February 07, 2021 at 07:55 UT with an ab…

We report the discovery of the fast optical transient ZTF21aahifke/AT2021clk with the Zwicky Transient Facility (ZTF, Bellm et al. 2019, Graham et al. 2019), as part of the "ZTFReST" project aiming a…

We draw attention to the rapidly fading lightcurve of AT2021buk from the combined ZTF and ATLAS survey data. The nature of AT2021buk is consistent with that of foreground CV, however, it is possible …

Here we report our VLA observation of the Type Ib/c supernova SN2021bhd. We detect a single point source (consistent with the position of SN2021bhd) with a flux level of ~0.47 mJy at a central freque…

Here we report the ATLAS discovery of the transient ATLAS21dov (AT2021bxu) in galaxy ESO 478- G 006 at magnitude m_c = 17.23 +/- 0.05. At a distance of 65 Mpc (redshift independent, from NED), the t…

We report on the ZTF discovery of ZTF21aagwbjr/AT2021buv, a fast optical transient that is temporally and spatially consistent with GRB210204A. ZTF21aagwbjr was first detected 45 minutes after the lo…

This report includes classifications of 8 Type Ias, 1 Type II, and 1 CV.

Here we report the ATLAS discovery of the transient ATLAS21dmw (AT2021bsf) in galaxy WISEA J120604.02+203213.0 at magnitude o = 17.16 +/- 0.06. At a distance of 104 Mpc, the transient was discovered …

This report includes classifications of 6 Type Ias, 1 Type Ia-91T-like, 1 TDE, 1 SLSN-I and 1 Type II.