DRAFT
2025-01-22 18:27:15
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN..27....1G
BlackGEM discovery of a possible young supernova in NGC 1398 at 24.8 Mpc: AT2025zi
Authors: P.J. Groot (Radboud/UCT/SAAO), S. deWet (DTU), H. Tranin (ICCUB), J. van Roestel (UvA), G. Leloudas (DTU), E. Zimmerman (Weizmann), S. Faris (Tel Aviv), H. Wichern (DTU), G. Ramsay (Armagh), F. Stoppa (Oxford/Radboud), N. Blagorodnova (ICCUB), S. Bloemen (Radboud), P. Vreeswijk (Radboud), D. Pieterse (Radboud)
Source Group: BlackGEM
Keywords: Transient, Supernova, Optical
Abstract:
BlackGEM discovery of possible young supernova in NGC 1398 with a 1.96 day explosion constraint.

The BlackGEM consortium reports the discovery of a possibly young supernova in NGC 1398 at a distance of 24.8 Mpc, located at RA (ICRS) = 03:38:54.586 (54.727442), DEC (ICRS) = -26:22:14.65 (-26.370736). AT2025zi [BGEM J033854.58-262214.6] was first detected by BG3 at 2025-01-21 01:02:37 UT with a magnitude of q_AB = 20.07+/-0.12. The transient was again detected on the following night at 2025-01-22 01:57:37 UT with an increased brightness of q_AB = 19.65+/-0.08 magnitudes.  

The most recent BlackGEM non-detection was at 2025-01-19 01:58:22 UT with q_AB > 21.2 (5-sigma) on BG2. This non-detection constrains the explosion time to a window of 1.96 days from the first detection.

Further constraints from other surveys and follow-up spectroscopy to identify the nature of AT2025zi are highly encouraged. 
 

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025zi [BGEM J033854.58-262214.6] 03:38:54.586 -26:22:14.65 03:38:54.595 -26:22:14.22 SN Iax[02cx-like] 0.0046

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