TNS Astronomical Transient Report No. 265086 [ 2025TNSTR3076....1T ]

Date Received (UTC): 2025-08-05 14:41:05
Date made public:
Sender: ATLAS_Bot1
Reporting Group: ATLAS     Discovery Data Source: ATLAS

J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), M. R. Alarcón, J. Licandro, P. Nichita (IAC), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU) report/s the discovery of a new astronomical transient.

IAU Designation: SN 2025tgu
Discoverer internal name: ATLAS25jcf
Coordinates (J2000): RA = 23:20:44.950 (350.1872925) DEC = +18:50:12.79 (18.836885)
Discovery date: 2025-08-05 11:23:39.264 (JD=2460892.97476)



Photometry

Discovery (first detection):
Discovery date: 2025-08-05 11:23:39.264
Flux: 18.814 ABMag
Filter: orange-ATLAS
Instrument: ATLAS-01
Telescope: ATLAS Mauna Loa

Last non-detection:
Last non-detection date: 2025-08-03 11:44:31
Limiting flux: 19.44 ABMag
Filter: cyan-ATLAS
Instrument: ATLAS-02
Telescope: ATLAS Haleakala


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