Cumulative scoring system for classification

1) Nearby targets:

- d ≤ 40 Mpc (Vrec ≤ 3000 km/s) => +3 - d ≤ 25 MPc (Vrec ≤ 1800 km/s) => +6

2) Young targets (at classification):

- tclass - (tdisc + tlim)/2 ≤ 4 => +5 - tclass - (tdisc + tlim)/2 ≤ 7 => +2 - tclass - (tdisc + tlim)/2 ≤ 10 => +1

3) Young targets (at discovery):

- tdisc - tlim ≤ 2 => +3 - tdisc - tlim ≤ 5 => +1

4) "Hostless"

- No apparent host galaxy in the discovery image (or fainter than M(B) > -18) => +3

5) Remote location on E/SO & halos of spirals:

- r≥15kpc => +2 - r≥25kpc => +4

6) Multiple-SN hosts

- Host galaxies with more than 3 SNe (including the new one) => +2

7) Star-forming environments

- Arp systems, transients in tidal tails or in dust lanes => +1

8) Peculiar light curves

- Slow light curve rise (≥ 30 days), or fast decline (≥ 1 mag/5days) => +2

9) Alerts

- GRB and/or XRF alerts => +4

10) Absolute magnitude criteria:

- super-luminous transients (M ≤ -20) => +4 - very luminous transients (-20 < M < -19.5) => +2 - very faint transients (-15.5 < M < -14.5) => +2 - ultra-faint transients (M ≥ -14.5) => +4

11) Pre-discovery variability history

- past, pre-SN detections => +3

12) AGN candidate contamination

- transient in the galaxy nucleus => -1

13) Short visibility window

- object that cannot be follow for more than 3 weeks => -5

Notes: - tclass = is the time when the classification is expected to be performed; tdisc = is the time of the earliest detection; tlim = is the epoch of the latest pre-discovery limit. - for the host galaxy distance use spectroscopic-z when available, otherwise photo-z; the webpage with the classification targets should contain all the information useful for computing the cumulative score (z, interstellar extinction, cross-ref with catalogues and circulars/astronomic telegrams, visibility window, current relative position of the moon, etc...)