DRAFT
2025-11-27 20:24:22
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.329....1A
Possible rebrightening of AT 2024uuw observed by ATLAS
Authors: C. R. Angus (QUB), K. W. Smith (Oxford/QUB), T.-W. Chen (NCU), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, A. Aamer, D. Magill (QUB), P. Ramsden (QUB/Birmingham), L. Shingles (GSI/QUB), S. J. Smartt (Oxford/QUB), S. Srivastav, H. Stevance, J. Gillanders, A. J. Cooper, F. Stoppa, J. Tweddle (Oxford), L. Rhodes (TSI/McGill), L. Denneau, J. Tonry, 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), A. Rest (STScI), C. Stubbs (Harvard), J. Sommer (LMU), B. P. Schmidt (ANU)
Source Group: ATLAS
Abstract:
We report on a re-brightening or second transient event towards the position of AT 2024uuw in ATLAS photometry light curves, 436 days after initial discovery in GOTO. The second flare is approximately 1 magnitude brighter than the first. Both events are coincident within the galaxy WISEA J063634.16-332051.1 at z = 0.037. We encourage follow-up observations of the current flare.

AT 2024uuw (GOTO24fqo/ATLAS25oif) was first discovered by GOTO on MJD=60560 (2024-09-06) at RA = 06:36:34.308, Dec = -33:20:42.62 (J2000) with a discovery magnitude of 19.44 mag. It reached a peak magnitude in ATLAS data retrieved via the forced photometry server (Shingles et al., 2021) of o=19.02±0.21 on MJD=60557, then faded over the course of 32 days, with a final detection of c=19.8±0.4 on MJD=60580.

We find no evidence of significant activity in the ATLAS forced photometry following the first flare until AT 2024uuw was re-detected in ATLAS on MJD=60990 (2025-11-11), 410 days following its last detection, with an c-band difference magnitude of 19.9±0.3 mag. It achieved its second maximum on MJD=61001 (2025-11-22), with a peak brightness of o=17.89±0.1.

AT 2024uuw is associated within WISEA J063634.16-332051.1, located 8.60" N, 0.94" E from the galaxy centre. With a spectroscopic redshift of z = 0.037, AT 2024uuw peaked at luminosities of M = -17.01 ± 0.20 mag and M = -18.14 ± 0.20 mag for its first and second peaks respectively. If originating from the same progenitor system, this may be similar to 2009ip-like outbursts.

The transient currently has an apparent magnitude of c = 18.12 ± 0.09. We encourage spectroscopic classification of the second peak whilst it is still bright. 

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 2024uuw [GOTO24fqo] 06:36:34.335 -33:20:42.66 WISEA J063634.16-332051.1 0.037629 06:36:34.335 -33:20:42.66

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