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Discovery and Classification of Transients from CRTS-II

ATel #9319; A. J. Drake, S. G. Djorgovski, A. A. Mahabal, M. J. Graham (Caltech); D. Stern (JPL), M. Catelan (PUC Chile); E. Christensen, S. M. Larson (LPL/UA)
on 4 Aug 2016; 18:32 UT
Credential Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Optical, Quasar, Supernovae, Transient

Following on from the Catalina Real-time Transient Survey (CRTS), the CRTS-II project has begun to search for transients and highly variable sources. As with CRTS, all detections will be made public immediately following discovery. Initial CRTS-II observations began on May 26th following the upgrade of the Catalina Sky Survey's 1.5m Mt. Lemmon telescope to a ~5 sq. deg field-of-view. A full list of current CRTS-II detections is given here.

Spectroscopic follow-up observations of CRTS-II SN candidates and unclassified sources was undertaken on July 3rd UT using the Palomar 5m with DBSP. Supernova spectra were classified using the SuperNova IDentification code (SNID; Blondin & Tonry 2007, ApJ, 666, 1024).

ID Disc. Mag Type Best Match redshift notes
MLS160617:211830+095501 20.0 SN Ia-91T 2001eh +3 0.13(1)
MLS160616:175555+434723 19.1 SN Ia 2005cf +5 0.069
MLS160616:160420+392813 18.0 SN SLSN-I LSQ14bdq 0.18 (2)
MLS160613:160158+154203 18.3 SN Ia 2006N +28 0.037 (3)
CSS160615:174311+170014 18.6 SN Ia-91T 1999aa +14 0.083 (4)
CSS160607:162521+574415 18.4 SN Ia 2005cf +37 0.063 (4)
MLS160702:153017+104945 20.4 AGN 1.20
MLS160614:220201+043654 20.1 AGN 1.06
MLS160613:165527+430121 20.4 AGN 1.53
MLS160607:231133+164715 20.4 AGN1.22 (5)

(1) This source matches AT2016cxr (=PS16cvv) and was first identified by PS1 on June 20th. 
(2) Type-I SLSN before maximum. Peak magnitude Mv=-22.2. 
(3) Classification is based on a noisy spectrum. 
(4) Transient was discovered in CSS telescope data. 
(5) Matches Chandra X-ray source CXO J231132.7+164714. Noisy spectrum. 

Further details of the discovery and classification of superluminous SN MLS160616:160420+392813 are available by following this link.

All CRTS-II and CRTS discoveries are publicly available via the CRTS homepage.