We observed the field of the SN 2024advj/ZTF24abxpkhb (AstroNote 2024-366, Fulton et al.) as part of the Kinder collaboration (Chen & Yang et al., 2024 arXiv:2406.09270), using the 40cm-SLT at Lulin Observatory, Taiwan, to obtain images in g, r, i, and z filters with 300 second exposure time for each.
Observations started at 16:17 UT on 11 of December 2024 (MJD = 60655.679), 2.5 days after the ZTF discovery (MJD = 60653.181) from the forced photometry. The images were taken under a various seeing conditions 2".0 and at an average airmass of 2.2.
We derived the following preliminary magnitudes using aperture photometry (all in the AB system) without template subtraction:
g = 17.20 +/- 0.08 mag,
r = 16.60 +/- 0.05 mag,
i = 16.12 +/- 0.04 mag,
z = 16.69 +/- 0.05 mag.
The presented magnitude was calibrated using the field stars from the SDSS DR18 (Almeida et al., 2023) catalog and was not corrected for the expected Galactic foreground extinction corresponding to a reddening of e.g. A_r = 0.26 mag in the direction of the transient (Schlafly & Finkbeiner 2011).
Compared to the ZTF g-band discovery magnitude, the g-band brightness has rapidly increased by ~ 4 mag in 2,4 days, about rising 1.5 mag per day. The object is confirmed to be very red, with (g-r) = 0.5 and (r-i) = 0.4 after correcting for Milky Way extinction. However, it does not exhibit a redder color in (i-z), which is measured as -0.6. Assuming a distance modulus of μ = 34.47, the absolute magnitudes are derived as M_g ~ -17.7, M_r ~ -18.1, M_i ~ -18.5, and M_z ~ -17.9 mag.
| 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 | 2024advj [ZTF24abxpkhb] | 00:58:33.386 | +45:00:40.63 | 00:58:33.390 | +45:00:40.72 | SN IIn | 0.017 |
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