Discovery certificate for object 2021em
TNS Astronomical Transient Report No. 95478 [ 2021TNSTR..26....1M ]

Date Received (UTC): 2021-01-04 21:44:30
Sender: ZTF (ALeRCE)
Reporting Group: ALeRCE     Discovery Data Source: ZTF

A. Munoz-Arancibia, F. Forster, F.E. Bauer, L. Hernandez-Garcia, G. Pignata, L. Galbany, E. Camacho, J. Silva-Farfan, A. Mourao, J. Arredondo, G. Cabrera-Vives, R. Carrasco-Davis, P.A. Estevez, P. Huijse, E. Reyes, I. Reyes, P. Sanchez-Saez, C. Valenzuela, E. Castillo, D. Ruz-Mieres, D. Rodriguez-Mancini, M. Catelan, S. Eyheramendy, M.J. Graham on behalf of the ALeRCE broker report/s the discovery of a new astronomical transient.

IAU Designation: AT 2021em
Discoverer internal name: ZTF21aaarnna
Coordinates (J2000): RA = 03:31:18.747 (52.8281104666667) DEC = +07:57:57.73 (7.96603693333333)
Discovery date: 2021-01-02 05:36:18.003 (JD=2459216.7335417)

Potential host galaxy: SDSS J033118.76+075757.3
Host redshift: 0.56

Remarks: SN candidate classified using ALeRCE's stamp classifier - see http://arxiv.org/abs/2008.03309 - and the public ZTF stream. Discovery image and light curve in http://alerce.online/object/ZTF21aaarnna

Photometry

Discovery (first detection):
Discovery date: 2021-01-02 05:36:18.003
Flux: 20.1803 ABMag
Filter: r-ZTF
Instrument: ZTF-Cam
Telescope: Palomar 1.2m Oschin

Remarks: Data provided by ZTF

Last non-detection:
Last non-detection date: 2020-12-28 05:06:20
Limiting flux: 19.2124 ABMag
Filter: g-ZTF
Instrument: ZTF-Cam
Telescope: Palomar 1.2m Oschin

Remarks: Data provided by ZTF

Details of the new object can be viewed here: https://www.wis-tns.org/object/2021em