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Spectroscopic Classifications of Optical Transients with SOAR

ATel #7640; Y.-C. Pan, S. Downing, R. J. Foley (Illinois), S. W. Jha (Rutgers), A. Rest (STScI), D. Scolnic (Chicago/KICP), K. W. Smith, D. Wright, S. J. Smartt (QUB), M. Huber, K. C. Chambers, H. Flewelling, M. Willman, N. Primak, A. Schultz, B. Gibson, E. Magnier, C. Waters, J. Tonry, R. J. Wainscoat (IfA, Hawaii)
on 16 Jun 2015; 12:33 UT
Credential Certification: Yen-Chen Pan (ycpan@illinois.edu)

Subjects: Optical, Supernovae

We report the following classifications of optical transients from spectroscopic observations with the Goodman spectrograph on the Southern Astrophysical Research (SOAR) telescope. Targets were supplied by the Pan-STARRS Survey for Transients (PSST), All-Sky Automated Survey for Supernovae (ASAS-SN), and MASTER. All observations were made on 2015 June 15 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).

 
Name                      | RA (J2000)  | Dec (J2000)  |  z    | Type | Phase |  Notes
PSNJ12503072-1052405 | 12:50:30.72 | -10:52:40.5 | 0.008 | II | | (1) ASASSN-15lg | 13:15:32.84 | +03:30:02.3 | 0.020 | Ia | -4d | (2) PS15asd | 16:10:29.79 | +24:03:04.1 | 0.043 | II | | PSNJ17162885+0625585 | 17:16:28.85 | +06:25:58.5 | 0.023 | IIb | | PS15arx | 15:48:23.67 | -18:33:38.3 | 0.13 | Ia | -4d | (3) MASTERJ214018.02-070410.7 | 21:40:18.02 | -07:04:10.7 | 0.05 | Ia | +18d | MASTERJ222232.87-185224.3 | 22:22:32.87 | -18:52:24.3 | 0.024 | Ia | -3d | (4) ASASSN-15ji | 23:35:14.36 | -22:44:24.1 | 0.055 | Ia | +35d | PS15aqz | 23:25:52.26 | +25:38:20.2 | 0.029 | Ia | +7d | (5)

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) 87A-like SN II. (2) We measure Si II 6355 and C II 6580 velocities of -13,200 km/s and -12,500 km/s, respectively. (3) We measure a Si II 6355 velocity of -14,400 km/s. (4) 91bg-like SN Ia. We measure a Si II 6355 velocity of -9500 km/s. (5) We measure a Si II 6355 velocity of -9900 km/s.