DRAFT
2026-01-21 17:46:09
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN..12....1L
Kinder follow-up observations of AT 2026ayt (ATLAS26ayq)
Authors: C.-H. Lai, A. Aryan, T.-W. Chen, W.-J. Hou, H.-Y. Hsiao (all NCU), S. J. Smartt, S. Srivastav (both Oxford), A. K. H. Kong (NTHU), Y. J. Yang (NYUAD), Y.-H. Lee, M.-H. Lee, Y.-C. Pan, C.-C. Ngeow, A. Sankar.K, C.-S. Lin, H.-C. Lin, J.-K. Guo (all NCU), S. Yang, Z. N. Wang, L. L. Fan, G. H. Sun (all HNAS), H.-W. Lin (UMich), J. H. Gillanders, H. F. Stevance, L. Rhodes (all Oxford), M. Nicholl, M. Fulton, T. Moore, K. W. Smith, C. Angus, A. Aamer (all QUB), A. Schultz and M. Huber (both IfA, Hawaii)
Source Group: Kinder
Keywords: Transient
Abstract:
We observed AT 2026ayt (ATLAS26ayq) with the Lulin One-meter Telescope at Lulin Observatory, Taiwan. Our data confirm a rise of ~ 0.5 mag within one day of discovery. From the multi-band photometry, corrected for Milky Way extinction, we estimate a blackbody temperature of 15560 +/- 700 K.

We observed the field of AT 2026ayt (ATLAS26ayq; Srivastav et al., AstroNote 2026-11) using the Lulin One-meter Telescope (LOT) at Lulin Observatory in Taiwan as part of the Kinder collaboration (Chen, Yang et al. 2025, ApJ, 983, 86).

Our imaging began at 15:40 UT on 2026 January 21st (MJD = 61061.653), 17.76 hours after the ATLAS discovery. Images were obtained under seeing conditions (FWHM ~ 2.8″), at an airmass of ~1.8. We utilized AutoPhOT (Brennan & Fraser, 2022, A&A, 667, A62) to perform the PSF photometry. The measured magnitude (in the AB system) are as follows:

g = 15.47 +/- 0.06 mag,
r = 15.58 +/- 0.06 mag,
i = 15.82 +/- 0.04 mag, and
z = 16.00 +/- 0.05 mag.

These reported magnitudes were calibrated against ATLAS-RefCat2 catalog from MAST (Tonry J. L. et al. 2018, ApJ, 867, 105) and were not corrected for the expected Galactic foreground extinction.

Using the multi-band photometry, after correcting for Milky Way extinction, we infer a blackbody temperature of 15560 +/- 700 K. Comparing with the ATLAS o-band discovery magnitude of 16.24 +/- 0.02 on MJD 61060.91, our r-band measurement shows a brightening of approximately 0.5 mag within 18 hours, hence it could still be either a supernova or a cataclysmic variable. 

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 2026ayt [ATLAS26ayq] 09:27:23.390 -32:00:30.88 09:27:23.390 -32:00:30.88 SN II 0.0036

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