J/MNRAS/520/4356 ASAS-SN bright supernova catalogue 2018-2020 (Neumann+, 2023) ================================================================================ The ASAS-SN bright supernova catalogue - V. 2018-2020. Neumann K.D., Holoien T.W.-S., Kochanek C.S., Stanek K.Z., Vallely P.J., Shappee B.J., Prieto J.L., Pessi T., Jayasinghe T., Brimacombe J., Bersier D., Aydi E., Basinger C., Beacom J.F., Bose S., Brown J.S., Chen P., Clocchiatti A., Desai D.D., Dong S., Falco E., Holmbo S., Morrell N., Shields J.V., Sokolovsky K.V., Strader J., Stritzinger M.D., Swihart S., Thompson T.A., Way Z., Aslan L., Bishop D.W., Bock G., Bradshaw J., Cacella P., Castro-Morales N., Conseil E., Cornect R., Cruz I., Farfan R.G., Fernandez J.M., Gabuya A., Gonzalez-Carballo J.-L., Kendurkar M.R., Kiyota S., Koff R.A., Krannich G., Marples P., Masi G., Monard L.A.G., Munoz J.A., Nicholls B., Post R.S., Pujic Z., Stone G., Tomasella L., Trappett D.L., Wiethoff W.S. =2023MNRAS.520.4356N (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Transient ; Supernovae ; Surveys ; Galaxies ; Galaxies, nearby ; Redshifts ; Positional data ; Spectral types ; References ; Photometry ; Optical ; Infrared ; Ultraviolet ; Extinction Keywords: catalogues - surveys - supernovae: general Abstract: We catalogue the 443 bright supernovae (SNe) discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) in 2018-2020 along with the 519 SNe recovered by ASAS-SN and 516 additional mpeak <= 18 mag SNe missed by ASAS-SN. Our statistical analysis focuses primarily on the 984 SNe discovered or recovered in ASAS-SN g-band observations. The complete sample of 2427 ASAS-SN SNe includes earlier V-band samples and unrecovered SNe. For each SN, we identify the host galaxy, its UV to mid-IR photometry, and the SN's offset from the centre of the host. Updated peak magnitudes, redshifts, spectral classifications, and host galaxy identifications supersede earlier results. With the increase of the limiting magnitude to g <= 18 mag, the ASAS-SN sample is nearly complete up to mpeak = 16.7 mag and is 90 per cent complete for mpeak <= 17.0 mag. This is an increase from the V-band sample, where it was roughly complete up to mpeak = 16.2 mag and 70 per cent complete for mpeak <= 17.0 mag. Description: Over the past decade, an increasing number of surveys have systematically scanned the sky in search of SNe and other transient events. The largest contributors are ASAS-SN, ZTF and ATLAS. All of ASAS-SN's observations are processed automatically and searched in real-time. ASAS-SN publicly announces new discoveries upon first detection where there is no ambiguity, or after follow-up imaging confirms an initially ambiguous source detection. ASAS-SN reports its discoveries to the TNS. Targets are spectroscopically confirmed by the ASAS-SN team and other groups. The untargeted design and high spectroscopic completeness make ASAS-SN ideal for population studies of nearby SNe and their host galaxies. The fifth paper of the serie of SNe ASAS-SN catalogues, and it spans the years 2018 to 2020. We provide information on all SNe discovered and recovered by ASAS-SN along with information on their host galaxies. By recovered SNe, we mean SNe discovered by a group other than ASAS-SN that were later seen independently by the ASAS-SN transient pipeline. SNe not discovered or recovered by ASAS-SN are presented alongside recoveries with similar data. We provide information for all bright SNe (mpeak <= 18 mag) gathered first from ASAS-SN data then external sources. The data and analysis presented in this catalogue are meant to supersede data from ASAS-SN web pages, TNS, and ATels relating to discovery and classification of SNe (i.e. see Introduction section). The table1.dat provides 585 SNe ASAS-SN photometric/spectroscopic and astrometric (using IRAF on collected images as Las Cumbres Observatory, amateur collaborators and NED i.e. section 2.1) informations, redshifts, names, types and references for discovering and classification. As explained in section 2, all ASAS-SN SNe with classification spectra have measured redshifts. When the SN has a host galaxy with a measured redshift agreeing with the SN's redshift, the redshift of the host is listed instead. SN classifications were primarily from TNS and ATels classification using packages to compare compare the observed spectrum to template spectra to estimate the redshift, type, and approximate age of the SN, in our sample ~140 are still unclassified. Next, we provide V/g peak magnitudes for SNe resulting to fits of new images subtracted light curves (using a reference image excluding any epoch with significant emission from the SN). As explained in section 2.3, the 443 host galaxy properties are galactic extinction estimates with host galaxy redshifts and host galaxy GALEX NUV, 2MASS IR and SDSS magnitudes as table3.dat shows. As explicited in section 2.2, concerning SNe discovered by professional/amateur teams, we include SNe only if they have spectroscopic classifications and peak magnitudes mpeak <= 18 mag. We based the list on the 'Latest Supernovae' website created by D. W. Bishop. This site assembles sources, including ATels and TNS, to build an annual data base of SNe. We acquired SN names, IAU names, discovery dates, coordinates, host galaxy names, peak computed/reported magnitudes (same technique of fit on images subtracted light curves), spectral types, redshifts, and discovery sources for each SNe. We used NED to gather host galaxy coordinates to calculate host offsets from angular separation and host redshifts for more accurate measurements. For the majority of SNe without a reported host galaxy, we used NED to locate the nearest possible host galaxy. To verify the accuracy of these hosts, we compared SNe redshifts to host redshifts as well as angular and physical offsets. More, for lacked or questionable redshifts, we used publicly available spectra from TNS and WISEREP to check the classification and redshift. We report 1035 SNes informations in table2.dat and 1035 host galaxy properties in table4.dat (galactic extinction estimates towards host magnitudes and host redshifts as in table3.dat). See also: J/MNRAS/509/5275 : SNe Ia type LF study (Sharon+, 2022) J/MNRAS/484/1899 : The ASAS-SN bright supernova catalogue - IV (Holoien+, 2019) J/MNRAS/484/3785 : Relative specific Type Ia supernovae rate (Brown+, 2019) J/MNRAS/471/4966 : ASAS-SN bright supernova catalogue 2016 (Holoien+, 2017) J/MNRAS/467/1098 : ASAS-SN bright supernova catalogue 2015 (Holoien+, 2017) J/MNRAS/464/2672 : ASAS-SN bright supernova catalogue 2013-2014 (Holoien+,2017) J/MNRAS/412/1441 : SNe luminosity functions (Li+, 2011) J/ApJ/951/134 : X-ray/UV & optical evolution of ASASSN -14ko (Payne+, 2023) J/ApJ/933/196 : Photometry and spectroscopy of ASASSN-17jz (Holoien+, 2022) J/ApJ/930/12 : Photometry & spectroscopy follow-up of ASASSN-20hx (Hinkle+, 2022) J/ApJ/923/86 : 2kpc environments of 472 supernovae (Cronin+, 2021) J/ApJ/922/186 : Keck/NIRES spectrum of type Ia SN 2020qxp (Hoeflich+, 2021) J/ApJ/910/120 : Dwarf nova outbursts detected by ASAS-SN (Kawash+, 2021) J/ApJ/898/161 : 500days of ASASSN-18pg multiwavelength obs. (Holoien+, 2020) J/ApJ/895/32 : Zwicky Transient Facility BTS. I. (Fremling+, 2020) J/ApJ/883/111 : UV-Opt LCs of ASASSN-19bt detected by TESS (Holoien+, 2019) J/ApJ/880/120 : Photometry of the tidal disruption event PS18kh (Holoien+, 2019) J/ApJ/873/L3 : NUV to NIR photometry of type IIP ASASSN-16at (Bose+, 2019) J/ApJ/853/62 : Optical and NIR spectra and LCs of SN2016ija (Tartaglia+, 2018) J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014) J/ApJ/713/1026 : SN Ia rate at redshift <~0.3 from SDSS-II (Dilday+, 2010) J/ApJ/560/566 : K-band galaxy luminosity function from 2MASS (Kochanek+, 2001) J/ApJS/259/53 : CNIa0.02 project DR1: type Ia SN z<0.02 light curves (Chen+, 2022) J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020) J/AJ/156/241 : A first catalog of variable stars measured by ATLAS (Heinze+, 2018) VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC-UMass, 2003-2006) II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+,2016) II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020) File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 204 585 SNe discovered by ASAS-SN over the 3yr spanning 2018 January 1 to 2020 December 31 table2.dat 232 1035 SNe not discovered by ASAS-SN but by other professional/amateur teams from 2018 to 2020 table3.dat 233 443 Host galaxies properties of SNe discovered by ASAS-SN team table4.dat 233 1035 Host galaxies properties of SNe discovered by other professional/amateur teams -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 A12 --- SNName Name of supernova (SNName) 14- 24 A11 --- IAUName IAU name of supernova (IAUName) 26- 38 A13 --- DiscDate Discovery Date (DiscDate) 40- 41 I2 h RAh Right Ascension (J2000) 43- 44 I2 min RAm Right Ascension (J2000) 46- 50 F5.2 s RAs Right Ascension (J2000) 52 A1 --- DE- Declination sign (J2000) 53- 54 I2 deg DEd Declination (J2000) 56- 57 I2 arcmin DEm Declination (J2000) 59- 63 F5.2 arcsec DEs Declination (J2000) 65- 71 F7.5 --- z ? Redshift of supernova (Redshift) 73- 76 F4.1 mag Discmag Discovery V-band or g-band Magnitude (1) 78- 81 F4.1 mag PeakVmag ? Peak V-band magnitude (PeakMagV) (2) 84- 87 F4.1 mag Peakgmag ? Peak g-band magnitude (PeakMagg) (2) 89 A1 --- f_Peakgmag Flag for magnitudes derived from maximum detected magnitude rather than a fit peak 91- 96 F6.2 arcsec Offset Offset from host nucleus (3) 98-104 A7 --- Type Type of supernova as ~330 Ia, ~85 II, ~10 Ib, ~20 Ic and ~140 not spectrally classified (Type) 106-108 I3 d Age ? Age of supernova at discovery relative to peak (4) 110-139 A30 --- Galaxy Host galaxy name often abbreviated due to space constraints (HostName) 141-168 A28 --- DiscReport Discovery AT astronomer's telegram or TNS report references (DiscReport) 170-204 A35 --- ClassReport Classification AT astronomer's telegram or TNS report references (ClassReport) -------------------------------------------------------------------------------- Note (1): Discovery magnitudes are V- or g-band magnitudes from ASAS-SN, depending on the camera used for discovery. Note (2): Peak V- and g-band magnitudes are measured from ASAS-SN data. The " " indicates the supernova was not detected in that filter in ASAS-SN data. Note (3): Offset indicates the offset of the supernova in arcseconds from the coordinates of the host nucleus, taken from NED. Note (4): All ages are approximate and are only listed if a clear age was given in the classification telegram. Possibly negative unphysical ages. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 30 A30 --- SNName Name of supernova (SNName) 32- 42 A11 --- IAUName IAU name of supernova (IAUName) 44- 56 A13 --- DiscDate Discovery Date (DiscDate) 58- 59 I2 h RAh Right Ascension (J2000) 61- 62 I2 min RAm Right Ascension (J2000) 64- 68 F5.2 s RAs Right Ascension (J2000) 70 A1 --- DE- Declination sign (J2000) 71- 72 I2 deg DEd Declination (J2000) 74- 75 I2 arcmin DEm Declination (J2000) 77- 81 F5.2 arcsec DEs Declination (J2000) 83- 89 F7.5 --- z ? Redshift of supernova (Redshift) 91- 94 F4.1 mag Peakmag ? Peak magnitude from D. W. Bishop's Latest Supernova website may be from different filters as described in Gal-Yam et al. 2013PASP..125..749G (PeakMag) 96- 99 F4.1 mag PeakVmag ? Peak V-band magnitude (PeakMagV) (1) 101 A1 --- f_PeakVmag Magnitudes derived from maximum detected magnitude rather than a fit peak 103-106 F4.1 mag Peakgmag ? Peak g-band magnitude (PeakMagg) (1) 108 A1 --- f_Peakgmag Magnitudes derived from maximum detected magnitude rather than a fit peak 110-115 F6.2 arcsec Offset Offset from host nucleus (Offset) (2) 117-125 A9 --- Type Type of supernova as ~650 Ia, ~40 Ib, 40 Ic, ~280 II and few others (Type) 127-156 A30 --- Galaxy Host galaxy name (Galaxy) 158-228 A71 --- Disc Discovery names (Discovered_by) (3) 230-232 A3 --- Recov Flag to indicates whether the SN was independently recovered in ASAS-SN data yes 519 times or not 516 times (Recovered?) -------------------------------------------------------------------------------- Note (1): Peak V- and g-band magnitudes are measured from ASAS-SN data. The " " indicates the supernova was not detected in that filter in ASAS-SN data. Note (2): Offset of the SNe in arcseconds from the coordinates of the host nucleus, taken from NED. Note (3): Amateurs indicates discovery by any number of non-professional astronomers. For the rest these are the list of professional teams and their number of sources discovered : (CRTS, 9) ; (DLT40, 14) ; (GOTO, 7) ; (Gaia, 81) ; (LOSS, 7) ; (MASTER, 32) ; (OGLE, 2) ; (PGIR, 1) ; (PTSS, 7) ; (Pan-STARRS, 16) ; (TNTS, 9) ; (ZTF, 404). -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 30 A30 --- Galaxy Host galaxy name (Galaxy) 32- 38 F7.5 --- z ? Redshift of supernova (Redshift) 40- 69 A30 --- SNName Name of supernova (SNName) 71- 79 A9 --- Type Type of supernova as (Type) 81- 86 F6.2 arcsec Offset Offset from host nucleus (1) 88- 92 F5.3 mag AV The V-band extinction (2) 94- 98 F5.2 mag NUVmag ? GALEX NUV magnitude from Galaxy Evolution Explorer of Morrissey et al. 2007ApJS..173..682M (NUV) (3) 100-103 F4.2 mag e_NUVmag ? Uncertainty of NUVmag 105-109 F5.2 mag umag ? SDSS DR14 u magnitude (u) (4) 111-115 F5.2 mag e_umag ? Uncertainty of umag 117-121 F5.2 mag gmag ? Pan-STARRS g magnitude (g) (5) 123-126 F4.2 mag e_gmag ? Uncertainty of gmag 128-132 F5.2 mag rmag ? Pan-STARRS r magnitude (r) (5) 134-137 F4.2 mag e_rmag ? Uncertainty of rmag 139-143 F5.2 mag imag ? Pan-STARRS i magnitude (i) (5) 145-148 F4.2 mag e_imag ? Uncertainty of imag 150-154 F5.2 mag zmag ? Pan-STARRS z magnitude (z) (5) 156-159 F4.2 mag e_zmag ? Uncertainty of zmag 161-165 F5.2 mag ymag ? Pan-STARRS y magnitude (y) (5) 167-170 F4.2 mag e_ymag ? Uncertainty of ymag 172 A1 --- l_Jmag Lower limit flag of Jmag 174-178 F5.2 mag Jmag 2MASS J magnitude (J) (6) 180-183 F4.2 mag e_Jmag ? Uncertainty of Jmag 185 A1 --- l_Hmag Lower limit flag of Hmag 187-191 F5.2 mag Hmag 2MASS H magnitude (H) (6) 193-196 F4.2 mag e_Hmag ? Uncertainty of Hmag 198 A1 --- l_Ksmag Lower limit flag of Ksmag 200-204 F5.2 mag Ksmag 2MASS Ks magnitude (Ks) (6) 206-209 F4.2 mag e_Ksmag ? Uncertainty of Ksmag 211 A1 --- f_Ksmag Flag for Ksmag detected in WISE W1 but not in KS (7) 213-217 F5.2 mag W1mag ? WISE W1 magnitude (W1) (8) 219-222 F4.2 mag e_W1mag ? Uncertainty of W1mag 224-228 F5.2 mag W2mag ? WISE W2 magnitude (W2) (8) 230-233 F4.2 mag e_W2mag ? Uncertainty of W2mag -------------------------------------------------------------------------------- Note (1): Offset indicates the offset of the supernova in arcseconds from the coordinates of the host nucleus, taken from NED. Note (2): Galactic extinction taken from Schlafly & Finkbeiner (2011ApJ...737..103S). Note (3): No magnitude is listed for those galaxies not detected in GALEX survey data. Note (4): No magnitude is listed for those galaxies not detected in SDSS data. Note (5): No magnitude is listed for those galaxies not detected in Pan-STARRS data. Note (6): For those galaxies not detected in 2MASS data, we assume an upper limit of the faintest galaxy detected in each band from our sample. We set J and H band limits based on the faintest galaxies in the 2014-2020 sample (J > 17.0 mag, H > 16.4 mag) and KS > 15.6 mag in total sample (see section 2.3). Note (7): For host galaxies detected in WISE W1 but not in 2MASS KS, we estimate the KS magnitudes based on the mean KS-W1 colour. For the 1730 host galaxies with both KS and W1 magnitudes, we have an average offset of -0.43 mag with a dispersion of 0.04 mag and a standard error of 0.001 mag. Note (8): No magnitude is listed for those galaxies not detected in AllWISE survey data. -------------------------------------------------------------------------------- History: From electronic version of the journal References: Holoien et al., Paper I 2017MNRAS.464.2672H, Cat. J/MNRAS/464/2672 Holoien et al., Paper II 2017MNRAS.467.1098H Holoien et al., Paper III 2017MNRAS.471.4966H, Cat. J/MNRAS/471/4966 Holoien et al., Paper IV 2019MNRAS.484.1899H, Cat. J/MNRAS/484/1899 Neumann et al., Paper V This work License: CC-BY-4.0 [see https://spdx.org/licenses/] ================================================================================ (End) Luc Trabelsi [CDS] 27-Mar-2026