GCN Circular 20627
Subject
LIGO/Virgo G270580: Gemini-South Spectroscopic Classification of Optical Transients
Date
2017-02-08T10:38:35Z (8 years ago)
From
Zach Cano at U of Iceland <zewcano@gmail.com>
���S. Schulze (Weizmann Institute) & Z. Cano (IAA-CSIC) report on behalf of a
larger collaboration:
Using the 8.2-m Gemini-South telescope mounted with GMOS-S we initiated
follow-up spectral classifications of the brightest transients identified
by the Transient Name Server (TNS; https://wis-tns.weizmann.ac.il) within
the LIGO/Virgo G270580 error region. Originally hindered by bad weather,
we successfully observed two transients on 2017-01-28 (PS17rz) and
2017-01-31 (AT2017ux). Both spectroscopic classifications were performed
using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Survey Name | IAU Name | RA (J2000) | Dec (J2000) | Date
| Time (UT) | Grism | Exposure | Type | Phase | Redshift | Note
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PS17rz | - | 09:36:57.18 | 29:40:06.10 |
2017-01-28 | 06:37:56 | R400 | 3 x 600s | SN Ia | pre-max |
0.151(4) | (1)
AT2017ux | SN2017ux | 09:22:53.20 | -03:12:52.30 | 2017-01-31 |
07:07:14 | R400 | 2 x 600s | SN Ia | max | 0.065(6) | (2,3)
Notes:
(1) The best-fitting templates were all SNe Ia at an average phase of -4
days before peak light.
(2) The best-fitting templates were all SNe Ia at an average phase of -1
day before peak light.
(3) Our measured SN classification (Ia) and redshift matches well with that
already reported to the TNS (z=0.07).
���