TNS Astronomical Transient Report No. 265668 [ 2025TNSTR3187....1R ]

Date Received (UTC): 2025-08-13 11:37:14
Date made public:
Sender: BTSbot_bot
Reporting Group: ZTF     Discovery Data Source: ZTF

Nabeel Rehemtulla (CIERA, NU), Wynn Jacobson-Galán (Caltech), Theophile du Laz (Caltech) on behalf of ZTF report/s the discovery of a new astronomical transient.

IAU Designation: SN 2025tsw
Discoverer internal name: ZTF25abikgia
Coordinates (J2000): RA = 02:11:25.850 (32.8577104) DEC = -17:45:47.97 (-17.7633238)
Discovery date: 2025-08-13 10:05:16.002 (JD=2460900.9203241)


Remarks: Bright (m_peak <= 18.5) transient candidate identified autonomously by BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).

Photometry

Discovery (first detection):
Discovery date: 2025-08-13 10:05:16.002
Flux: 18.2292 ABMag
Filter: r-ZTF
Instrument: ZTF-Cam
Telescope: Palomar 1.2m Oschin

Last non-detection:
Archival info: Other
Remarks: No non-detections prior to first detection in ZTF Public+Partnership+Caltech, ZTF Public+Partnership, ZTF Public alert streams

Details of the new object can be viewed here: https://www.wis-tns.org/object/2025tsw