Discovery certificate for object 2020cby
TNS Astronomical Transient Report No. 61386 [ 2020TNSTR.427....1P ]

Date Received (UTC): 2020-02-08 22:30:44
Sender: Dr. Ismael Perez-Fournon
Reporting Group: SGLF     Discovery Data Source: ZTF

I. Perez-Fournon, C. Jimenez Angel, F. Poidevin, R. Shirley (IAC & ULL), R. Marques-Chaves (CAB), S. Geier (GRANTECAN & IAC), Y. Shu (IoA), S. Rodney, J. Roberts-Pierel (Univ. of South Carolina), A. Bolton (NSF's OIR Lab), S. Chakrabarti, P. Craig, and B. Alamiri (RIT) report/s the discovery of a new astronomical transient.

IAU Designation: AT 2020cby
Discoverer internal name: ZTF20aalraxs
Coordinates (J2000): RA = 12:35:08.349 (188.784787) DEC = +71:41:07.24 (71.685344)
Discovery date: 2020-02-02 11:19:04.000 (JD=2458881.9715741)

Remarks: Data were provided by the Zwicky Transient Facility ( and processed through the Lasair (, ALeRCE (, ANTARES (, and MARS ( brokers.


Discovery (first detection):
Discovery date: 2020-02-02 11:19:04.000
Flux: 20.394 ABMag
Filter: g-ZTF
Instrument: ZTF-Cam
Telescope: Palomar 1.2m Oschin

Last non-detection:
Last non-detection date: 2020-02-02 07:08:11
Limiting flux: 20.1 ABMag
Filter: r-ZTF
Instrument: ZTF-Cam
Telescope: Palomar 1.2m Oschin

Details of the new object can be viewed here: