DRAFT
2026-05-22 12:51:34
Type: Object/s-Data/Analysis
Bibcode: 2026TNSAN.149....1S
The rapidly evolving transient AT2026naq in IC 0827 at 100 Mpc
Authors: S. Srivastav (Oxford), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, C. R. Angus, M. Nicholl, J. Weston (Queen's University Belfast), J. Gillanders (Oxford), L. Denneau, J. Tonry, H. Weiland (IfA, University of Hawaii) on behalf of a wider collaboration
Source Group: ATLAS
Keywords: Transient, Supernova
Abstract:
We report rapid fading in the light curve of AT2026naq/ZTF26aaxgdqa through combined ZTF and ATLAS survey data. The transient shows a fade of 0.5 mag/day from a peak absolute g-band magnitude of -15.9 from ZTF. Spectroscopic classification and further followup observations are encouraged.

We draw attention to the rapidly evolving light curve of AT2026naq from combined ZTF and ATLAS survey data. AT2026naq/ZTF26aaxgdqa was discovered by ZTF on MJD 61179.19 (2026-05-19.19) at g = 19.65 +/- 0.14. The transient subsequently rose to g = 19.10 +/- 0.14 the next day on MJD 61180.35, before rapidly fading to g = 20.05 +/- 0.18 by MJD 61182.19, with a decline rate of 0.5 mag/day in ZTF-g. The ZTF light curve data are available through the Lasair-ZTF broker : https://lasair-ztf.lsst.ac.uk/objects/ZTF26aaxgdqa

The rapid evolution is evident in subsequent ATLAS observations (see attached plot showing combined ZTF+ATLAS photometry). The likely host galaxy for AT2026naq is IC 0827 at z = 0.021587 (from NED), corresponding to roughly 100 Mpc. The peak g-band magnitude from ZTF implies an absolute magnitude of M_g = -15.9, consistent with a kilonova or a shock-cooling signature commonly detected in SNe IIb. The transient reddens slightly from a (g-r) colour of -0.05 at peak to +0.18 two days after. Spectroscopic confirmation and further followup observations 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 2026naq [ZTF26aaxgdqa] 12:51:56.470 +16:16:53.47 IC 0827 0.021587 12:51:56.463 +16:16:53.32 SN IIb 0.021
File Comments
2026naq_LC_plot_0.png Combined ZTF+ATLAS light curve plot for AT2026naq. Flux is in micro Jansky.

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