Discovery certificate for object 2020xtc
TNS Astronomical Transient Report No. 86928 [ 2020TNSTR3195....1H ]

Date Received (UTC): 2020-10-21 13:02:53
Sender: Gaia (Gaia_Bot1)
Reporting Group: GaiaAlerts     Discovery Data Source: GaiaAlerts

S.T. Hodgkin, E. Breedt, A. Delgado, D.L. Harrison, M. van Leeuwen, G. Rixon, T. Wevers, A. Yoldas (IoA Cambridge), N. Ihanec, K. Kruszyńska, K.A. Rybicki, Ł. Wyrzykowski (Warsaw University Astronomical Observatory), Z. Kostrzewa-Rutkowska (Leiden Observatory), D. Eappachen (SRON/RU), G. Marton (Konkoly Observatory), on behalf of the Gaia Alerts team report/s the discovery of a new astronomical transient.

IAU Designation: AT 2020xtc
Discoverer internal name: Gaia20evw
Coordinates (J2000): RA = 12:05:21.080 (181.337833) DEC = +28:56:21.16 (28.939211)
Discovery date: 2020-10-19 00:23:02.400 (JD=2459141.516)


Remarks: known Seyfert 1 galaxy 2MASX J12052103+2856205 brightens by 1.1 mag in 4 months

Photometry

Discovery (first detection):
Discovery date: 2020-10-19 00:23:02.400
Flux: 18.7 ABMag
Filter: G-Gaia
Instrument: Gaia-photometric
Telescope: Gaia Spacecraft

Last non-detection:
Last non-detection date: 2020-04-22 15:43:12
Limiting flux: 21.5 ABMag
Filter: G-Gaia
Instrument: Gaia-photometric
Telescope: Gaia Spacecraft


Details of the new object can be viewed here: https://www.wis-tns.org/object/2020xtc