TNS Astronomical Transient Report No. 255157 [ 2025TNSTR1803....1T ]

Date Received (UTC): 2025-05-16 20:03:31
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), 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 2025knh
Discoverer internal name: ATLAS25ezh
Coordinates (J2000): RA = 21:04:47.995 (316.199977778) DEC = -39:26:08.13 (-39.4355911111)
Discovery date: 2025-05-15 01:52:45.984 (JD=2460810.57831)



Photometry

Discovery (first detection):
Discovery date: 2025-05-15 01:52:45.984
Flux: 18.358 ABMag
Filter: orange-ATLAS
Instrument: ATLAS-03
Telescope: ATLAS Sutherland

Last non-detection:
Last non-detection date: 2025-05-14 07:28:41
Limiting flux: 16.16 ABMag
Filter: orange-ATLAS
Instrument: ATLAS-04
Telescope: ATLAS El Sauce


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