Discovery certificate for object 2015cs
TNS Astronomical Transient Report No. 29894 [ 2019TNSTR.231....1T ]

Date Received (UTC): 2019-02-12 11:31:18
Sender: Mr. Richard Nowell
Source Group: None

I. Theunissen-limpens, R. Nowell, A. Jonkeren report/s the discovery of a new astronomical transient.

IAU Designation: AT 2015cs
Coordinates (J2000): RA = 15:19:47.572 (229.948218) DEC = -02:09:04.54 (-2.151261)
Discovery date: 2015-03-30 09:18:23 (JD=2457111.8877662)

Potential host galaxy: SDSS J151947.95-020912.6
Host redshift: 0.0369243

Remarks: This transient was first noticed on the Galaxy Zoo website by Ine Theunissen-limpens here: https://www.zooniverse.org/projects/zookeeper/galaxy-zoo/talk/subjects/28479218 . Also taking part in the discussion are: Richard Nowell, Alexander Jonkeren, CeciliaB and Elizabeth Siegel.

Photometry

Discovery (first detection):
Discovery date: 2015-03-30 09:18:23
Flux: 20.64 ABMag
Filter: g-Sloan
Instrument: RC-Spec-4
Telescope: CTIO - 4-m Victor M. Blanco Telescope

Remarks: The DECAM g-band Apparent magnitude was calculated by R. Nowell using APT and the reference star: SDSS J151948.06-020827.3 http://skyserver.sdss.org/dr14/en/tools/explore/Summary.aspx?id=1237655691943673996. An additional z-band magnitude was calculated as 17.21.

Last non-detection:
Archival info: SDSS

Details of the new object can be viewed here: https://wis-tns.weizmann.ac.il/object/2015cs