TNS Astronomical Transient Report No. 279360 [ 2025TNSTR4832....1S ]

Date Received (UTC): 2025-12-04 18:40:08
Date made public:
Sender: NGDEEP_Bot
Reporting Group: NGDEEP     Discovery Data Source: NGDEEP

Magdalena Sammut on behalf of NGDEEP report/s the discovery of a new astronomical transient.

IAU Designation: AT 2023aefb
Coordinates (J2000): RA = 03:33:00.159 (53.2506642) DEC = -27:49:23.53 (-27.8232031)
Discovery date: 2023-02-02 00:00:00.000 (JD=2459977.5)

Potential host galaxy: NGDEEP+53.25060-27.82316
Host redshift: 2.474

Remarks: This is probably a real transient, but we do have some doubts because there may be image subtraction residuals; Spec-z referenced from Balestra et al., 2009

Photometry

Discovery (first detection):
Discovery date: 2023-02-02 00:00:00.000
Flux: 29.04 ABMag
Filter: F200W-JWST
Instrument: NIRCam
Telescope: James Webb Space Telescope

Last non-detection:
Archival info: Other
Remarks: This source was not detected in The Next Generation Deep Extragalactic Exploratory Public (NGDEEP) Survey obs001 images taken on January 24, 2024 (NGDEEP; Cycle 1, 2079)

Details of the new object can be viewed here: https://www.wis-tns.org/object/2023aefb