TNS Astronomical Transient Report No. 263777 [ 2025TNSTR2922....1R ]

Date Received (UTC): 2025-07-26 04:57:39
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 2025sei
Discoverer internal name: ZTF22aakyeps
Coordinates (J2000): RA = 17:48:59.449 (267.2477054) DEC = +25:29:45.09 (25.495857)
Discovery date: 2025-07-23 06:39:49.003 (JD=2460879.7776505)


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: 2025-07-23 06:39:49.003
Flux: 19.8408 ABMag
Filter: g-ZTF
Instrument: ZTF-Cam
Telescope: Palomar 1.2m Oschin

Last non-detection:
Last non-detection date: 2025-07-22 10:27:57
Limiting flux: 20.1368 ABMag
Filter: r-ZTF
Instrument: ZTF-Cam
Telescope: Palomar 1.2m Oschin


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