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Spectroscopic Classifications of Optical Transients with Mayall/KOSMOS

ATel #10868; E. Xhakaj, Y.-C. Pan, C. Rojas-Bravo, C. D. Kilpatrick, R. J. Foley (UCSC), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP)
on 19 Oct 2017; 05:22 UT
Credential Certification: Yen-Chen Pan (ypan6@ucsc.edu)

Subjects: Optical, Supernovae

We report the following classifications of optical transients from spectroscopic observations with KOSMOS on the KPNO Mayall 4-m telescope. Targets were supplied by the ATLAS and PTSS. All observations were made on 2017 Oct 17 and 18 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name       | IAU Name  | RA (J2000)  | Dec (J2000)  | z     | Type | Phase | Notes
ATLAS17lui | AT2017hcd | 01:42:51.83 | +31:28:56.57 | 0.035 | IIn | | PTSS-17xpm | AT2017hia | 01:56:09.34 | +17:38:29.17 | 0.038 | Ic | +20 d | (1) ATLAS17lss | AT2017hcb | 02:36:23.72 | +31:42:34.83 | 0.017 | Ib | | ATLAS17mfr | AT2017hje | 03:33:43.56 | -26:10:37.58 | 0.043 | Ic | | (2)

Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) SNID gives a best match to SN Ic, but we also found some good matches to SN Ib assuming the same redshift. (2) We also found some good matches to SN Ia, but at a lower redshift (z~0.034) than the measured host redshift.