Discovery certificate for object 2015df
TNS Astronomical Transient Report No. 48190 [ 2019TNSTR1950....1T ]

Date Received (UTC): 2019-09-30 08:06:00
Sender: Mr. Richard Nowell
Source Group: None

I. Theunissen-Limpens, V. Henderson report/s the discovery of a new astronomical transient.

IAU Designation: AT 2015df
Coordinates (J2000): RA = 13:35:50.208 (203.9592) DEC = +00:30:03.24 (0.5009)
Discovery date: 2015-03-28 06:20:21 (JD=2457109.7641319)

Potential host galaxy: SDSS J133550.20+003003.3
Host redshift: 0.062319

Remarks: This transient was first noticed by Ine Theunissen in a discussion started by Victoria Henderson (username RoseWater) on the Galaxy Zoo website here: https://www.zooniverse.org/projects/zookeeper/galaxy-zoo/talk/subjects/32411079. Christine Macmillan also took part in the discussion.

Photometry

Discovery (first detection):
Discovery date: 2015-03-28 06:20:21
Flux: 17.03 ABMag
Filter: g-Sloan
Instrument: DECAM
Telescope: CTIO - 4-m Victor M. Blanco Telescope

Remarks: The g-band Apparent magnitude was taken from the DECaLS DR7 catalogue. A g-band Absolute magnitude of -20.16 was also calculated.

Last non-detection:
Archival info: SDSS

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