Padova-Asiago Supernova Group
The Asiago Transient Classification Program

The program started in 2011 with the aim to classify all transients that are accessible from Asiago and are bright enough for our telescope/instrumentation. We use mainly the 1.82m Copernico telescope of Cima Ekar and, if not available, the 1.22m Galileo telescope of the Pennar station. A few cases of transients classified by our group with other facilities (eg. TNG) are included in the database.
Transient classification information and spectra (fits format) are made immediately available at our site. The spectra are semi-automatic reduction with archive calibration data. Please keep this in mind when using them.
For SN classification we compare the output of two automatic SN classification codes: Gelato (Harutyunyan et al. 2008, A&A 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666, 1024).
If you use some of the information posted in these pages please make a reference to the paper Tomasella etal. 2014, A.N. 335, 841.

Latest classifications
sn galaxy RA DEC discoverer type redshift ref class fits
IC 3203 12:21:48.75 +25:52:22.15 Catalina Real-Time Transient Survey Ia 0.02309 ATEL
  16:45:38.98 +01:37:20.28 Pan-STARRS1 (aka PS17ckw) IIb 0.022 ATEL
Ark481 15:39:05.04 +05:34:16.93 ASASSN Ia-91T like 0.025955 ATEL
NGC 3506 11:03:13.00 +11:04:40.87 ASASSN (at2017dfq) Ia 0.021358 ATEL
SDSS J160943.67+4802 16:09:43.67 +48:02:09.4 ATLAS (ATLAS17deh) Core-Collapse 0.037 ATEL

CSS170430 in IC 3203
CSS170430 in IC 3203
Discovered by: Catalina Real-Time Transient Survey

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic classification of CSS170430:122149+255222 in IC 3203, discovered by the Catalina Real-Time Sky Survey.

The observations were performed with the Asiago 1.22 m Galileo Galilei Telescope equipped with the B&C spectrograph (range 330-790 nm; resolution 0.7 nm).

Survey Name               |  Discovery date (UT) | Discovery mag | Observation (UT)    |  Type  | z        | Notes|
CSS170430:122149+255222   | 2017-04-30.32        |      17.23     |2017-05-07.95        |  SN Ia | 0.02309 | (1)  |

(1) The spectrum is consistent with that of a Type Ia SN at about the maximum light. The redshift is taken from Courtois & Tully, 2015, MNRAS, 447, 1531. The expansion velocity of the ejecta, as deduced from the position of the P Cygni mumimum of the Si II 635.5 nm line is about 12900 km/s, which is consistent with CSS170430:122149+255222 being a member of the high-velocity gradient group of Benetti et al. 2005, ApJ, 623, 1011.

Classification were done with GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024). The Asiago classification spectra are posted at the website