Discovery and Classification of ZTF Transients
ATel #11567; Ragnhild Lunnan, Francesco Taddia, Jesper Sollerman, Cristina Barbarino, Ariel Goobar (OKC), Christoffer Fremling, Mansi Kasliwal, Chris Cannella, Nadejda Blagorodnova, J. Don Neill, Richard Walters, Anna Ho, Lin Yan, Kevin Burdge (Caltech), Steve Schulze, Ofer Yaron, Avishay Gal-Yam, Yi Yang (Weizmann), Melissa Graham, V. Zach Golkhou, Eric Bellm (UW), Daniel Perley (LJMU) for the Zwicky Transient Facility Collaboration
on 24 Apr 2018; 07:55 UT
Credential Certification: Ragnhild Lunnan (ragnhildlunnan@gmail.com)
Subjects: Optical, Supernovae
We report spectroscopic classifications of 17 transients discovered by the Zwicky Transient Facility (ZTF; ATel #11266) during science validation. Additional classifications of older transients have been reported to and are publicly available on the TNS. Spectra were obtained with DBSP at the Palomar 200-in Hale Telescope, with DIS at the ARC 3.5m telescope at Apache Point Observatory, and with SPRAT at Liverpool Telescope. Classifications were done using Superfit (Howell et al. 2005) and GELATO (Harutyunyan et al. 2008), and are reported in the table below along with the discovery data. Magnitudes are in r-band unless otherwise noted. The spectra are publicly available via WISeREP and the TNS.
Survey Name | IAU Name | RA (J2000) | DEC (J2000) | Disc. date | Disc. mag |Spec. date | Instr. | Redshift | Type | Notes
ZTF18aahfgsk | SN2018aqk | 12:04:58.30 | +32:23:29.0 | 2018-04-06.21 | 17.8 | 2018-04-10 | APO+DIS | 0.054 | Ia |
ZTF18aahheaj | SN2018avp | 13:00:26.51 | +18:37:09.7 | 2018-04-10.25 | 18.3 | 2018-04-10 | APO+DIS | 0.048 | Ia |
ZTF18aaccuih | SN2018ds | 14:48:53.55 | +38:46:03.1 | 2018-03-21.38 | 18.7 | 2018-04-10 | P200+DBSP | 0.032 | Ia |
ZTF18aagtdce | SN2018aqm | 16:32:11.56 | +42:42:48.3 | 2018-03-29.40 | 19.6 (g) | 2018-04-10 | P200+DBSP | 0.032 | Ia |
ZTF18aahhbkj | SN2018adu | 14:13:38.08 | +34:56:43.9 | 2018-04-06.52 | 18.1 | 2018-04-10 | P200+DBSP | 0.066 | II |
ZTF18aahmrtf | SN2018bas | 11:51:11.46 | +16:31:47.4 | 2018-04-08.29 | 19.6 | 2018-04-10 | P200+DBSP | 0.066 | II |
ZTF18aahfgyz | SN2018ast | 11:41:07.99 | +24:49:10.4 | 2018-04-07.24 | 16.8 | 2018-04-10 | P200+DBSP | 0.012 | Ia | (1)
ZTF18aaguhgb | SN2018bat | 14:37:49.01 | +45:32:57.4 | 2018-03-30.30 | 19.7 (g) | 2018-04-10 | P200+DBSP | 0.124 | Ia |
ZTF18aahfxnn | SN2018bau | 11:46:11.96 | +09:21:18.1 | 2018-04-06.23 | 19.0 | 2018-04-10 | P200+DBSP | 0.08 | Ia |
ZTF18aahmxqa | SN2018aqf | 18:26:48.86 | +51:08:25.7 | 2018-04-08.39 | 18.5 | 2018-04-10 | P200+DBSP | 0.033 | Ib |
ZTF18aagrgao | SN2018bav | 16:47:25.53 | +25:41:06.3 | 2018-03-21.39 | 19.7 | 2018-04-10 | P200+DBSP | 0.114 | Ia |
ZTF18aaibibr | SN2018baw | 17:26:33.99 | +34:22:24.8 | 2018-03-21.45 | 20.1 | 2018-04-10 | P200+DBSP | 0.062 | Ia |
ZTF18aaitowa | SN2018bax | 16:04:35.88 | +71:28:31.8 | 2018-04-11.28 | 20.2 | 2018-04-11 | P200+DBSP | 0.116 | Ia |
ZTF18aaimxdx | SN2018bay | 17:44:08.86 | +39:21:19.2 | 2018-04-10.38 | 18.6 | 2018-04-11 | P200+DBSP | 0.04 | Ia | (2)
ZTF18aaiajvb | SN2018baz | 16:24:13.39 | +25:16:19.4 | 2018-03-21.41 | 20.6 | 2018-04-11 | P200+DBSP | 0.10 | Ia |
ZTF18aahqavd | SN2018bba | 10:38:03.99 | +45:15:23.9 | 2018-04-10.26 | 20.3 | 2018-04-11 | P200+DBSP | 0.121 | Ia |
ZTF18aairuad | SN2018baq | 11:51:45.52 | +57:47:58.2 | 2018-04-11.20 | 19.8 | 2018-04-16 | LT+SPRAT | 0.064 | Ia |
(1) 1991bg-like
(2) 1991bg-like
ZTF is currently in science validation and we are now commissioning the ZTF alert infrastructure. The transients reported here were detected using a preliminary version of the production pipeline with manual filtering of the alert stream. Major components of the system are under active refinement. This includes reliability scores from machine-learned vetting, star-galaxy classification, and a Kafka-based alert distribution system (see http://www.ztf.caltech.edu/page/technical#status for further details). Future ATels will report progress on the remaining key stages of this commissioning process. Public alert distribution is anticipated to start in late May.
ZTF is a project led by PI S. R. Kulkarni at Caltech (see ATEL #
11266), and includes IPAC, LANL, JSI/UMd, UWM, UW (US); OKC, Sweden; DESY, Germany; WIS, Israel, and NRC, Taiwan. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341.
