DRAFT
2020-08-21 20:21:51
Type: Object/s-Data/Analysis
Bibcode: 2020TNSAN.161....1P
Follow-up observations of GSNST-20ca (AT2020rml) with the Liverpool Telescope
Authors: Daniel Perley (LJMU), Christopher Copperwheat (LJMU), Muryel Guolo-Pereira (Universidade Federal de Santa Catarina), R. Cutter (University Warwick), Jielai Zhang (OzGrav, Swinburne University of Technology), Luca Ighina (Università degli Studi di Milano-Bicocca), Carmen R. Hoek (Kapteyn Institute, University of Groningen), Igor Andreoni (Caltech), Swayamtrupta Panda (Center for Theoretical Physics, Polish Academy of Sciences), Aayush Gautam (Birendra Multiple Campus, Tribhuvan University), Elismar Lösch (Universidade Federal de Santa Catarina, Florianópolis), Thomas Killestein (University of Warwick), Kiran M Jayasurya (Indian Institute of Space Science and Technology, Trivandrum), Anirban Bairagi (IIT Kharagpur), Raj Kumar Pradhan (Central Department of Physics, Tribhuvan University)
Keywords: Optical, Transient
Abstract:
Follow-up observations of AT2020rml with the Liverpool Telescope do not detect the transient candidate, suggesting that it is not a real transient or that it has faded rapidly.

We conducted follow-up imaging and spectroscopy of the candidate supernova GSNST-20ca (AT 2020rml; TNS report 80195) using the Liverpool Telescope as part of a live observing session during the Global Relay of Observatories Watching Transients Happen (GROWTH) online astronomy school.  We obtained one 180s image in each of the g, r, and i band filters with IO:O between 03:38 and 03:48 UT on 2020-08-19, followed by two spectroscopic exposures of 600 seconds with SPRAT. 


Image subtraction of the IO:O images versus Pan-STARRS reference imaging shows no source at the location of the reported transient, to an estimated limiting magnitude of approximately 22.  The extracted spectrum shows only host galaxy light at z=0.018, consistent with the catalogued redshift of the host galaxy.  We thus cannot confirm the presence of a transient in this galaxy, unless it faded very rapidly from the reported discovery three days prior.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2020rml [GSNST-20ca] 01:24:27.398 +33:47:56.53 NGC 513 0.019544 Catalog redshift from NED. 01:24:27.398 +33:47:56.53

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