TNS Astronomical Transient Report No. 258408 [ 2025TNSTR2202....1S ]

Date Received (UTC): 2025-06-13 21:24:46
Date made public:
Sender: Krzysztof Stanek
Reporting Group: ASAS-SN     Discovery Data Source: ASAS-SN

K. Z. Stanek, for the ASAS-SN team report/s the discovery of a new astronomical transient.

IAU Designation: AT 2025nlr
Discoverer internal name: ASASSN-25cm
Coordinates (J2000): RA = 15:08:03.274 (227.01364) DEC = -40:08:29.58 (-40.14155)
Discovery date: 2025-06-12 20:52:48.000 (JD=2460839.37)


Remarks: Very bright, young transient, possibly a Galactic Nova; photometry likely uncertain as the object is close to/above saturation limit

Photometry

Discovery (first detection):
Discovery date: 2025-06-12 20:52:48.000
Flux: 8.7 ABMag
Filter: g-Sloan
Instrument: Payne-Gaposchkin
Telescope: ASASSN-Payne-Gaposchkin

Last non-detection:
Last non-detection date: 2025-06-11 17:45:36
Limiting flux: 16.9 ABMag
Filter: g-Sloan
Instrument: Payne-Gaposchkin
Telescope: ASASSN-Payne-Gaposchkin


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