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SALT Spectroscopic follow-up of nuclear transients from Gaia and OGLE

ATel #9497; A. Hamanowicz (Warsaw University Astronomical Observatory, Poland), N. Britavskiy (Department of Astronomy and Astronomical Observatory, Odessa National University, Ukraine), L. Wyrzykowski (Warsaw University Astronomical Observatory, Poland), David Buckley, Patricia Whitelock (South African Astronomical Observatory)
on 15 Sep 2016; 13:19 UT
Credential Certification: Lukasz Wyrzykowski (wyrzykow@astrouw.edu.pl)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 10293

We report the spectroscopic classification of five on-going transients discovered by Gaia and OGLE surveys. The spectra were obtained using the Robert Stobie Spectrograph (RSS) on the South African Large Telescope (SALT). The targets were selected from Gaia Photometric Science Alerts webpage (http://gsaweb.ast.cam.ac.uk/alerts) and OGLE-IV Real-time Transient Search (http://ogle.astrouw.edu.pl/ogle4/transients/ Wyrzykowski et al. 2014). Spectroscopic classification was done using SNID code (Blondin & Tonry 2007).

Name | RA (J2000) | Dec (J2000) | Disc. Date | Disc. Mag (band) | Obs. Date | z | Type | Notes |
Gaia16asb | 00:24:17.42 | -38:12:04.39 | 2016-06-13 | 18.71 (G) | 2016-07-08 | 0.11617 | SN Ia/galaxy | (1) |
Gaia16apt | 12:37:01.62 | -22:26:09.74 | 2016-05-20 | 18.30 (G) | 2016-07-03 | 0.13650 | AGN flare/TDE? | (2) |
Gaia16aqc | 01:44:55.39 | -21:49:10.81 | 2016-05-23 | 17.84 (G) | 2016-07-03 | 0.42748 | AGN flare/TDE? | (3) |
Gaia16aqg | 02:20:14.52 | -40:53:05.14 | 2016-05-23 | 17.97 (G) | 2016-07-08 | 0.05956 | SN II?/galaxy | (4) |
OGLE-2014-SN-122 | 02:36:55.78 | -72:10:00.00 | 2014-11-05 | 17.57 (I) | 2016-09-07 | 0.05960 | SN IIn | (5) |

(1) possible SN type Ia based on weak broad features, SNID classification: galaxy, flare probably too faint to be visible in the spectrum
(2) blue continuum, broad H_alpha, H_beta, narrow [OII], [OIII] and [NII] lines
(3) blue continuum, break in the continuum at 3000 A restframe, obvious AGN broad H_beta, H_gamma and narrow [OIII], [OII], but also weak broad HeII.
(4) P-Cyg profile on H_alpha, SNID classification: galaxy, spectrum dominated by the galaxy light
(5) Discovery reported in Wyrzykowski et al. (ATEL #6700). The light curve shows unusually long and still on-going transient (>600 days). The spectrum has a narrow H_alpha superimposed with a broad asymmetric base. The location of the transient is in fact 2 arcsec from two merging galaxies. Previously classified as a galaxy (ATEL #6739).