AstroNote 2024-313

AT 2024led (https://alerce.online/object/ZTF24aarjcbz) was discovered in the ZTF public alert stream on June 10, 2024 at RA = 21:06:18.885, Dec = -01:03:59.76 (J2000), with an r-band difference magnitude 19.60+-0.15 mag; it was reported to TNS by SGLF (Perez-Fournon et al. 2024). It rose to a peak r-band difference magnitude of 19.05+-0.17 mag, 8 days after discovery. Prior to the re-brightening or second event, the last detection in the public ZTF alert stream was on June 29, 2024 with a g-band difference magnitude 19.89+-0.16 mag. It had no detections in the public ZTF alert stream until 114 days later (or 133 days after discovery), on October 21, 2024 with a g-band difference magnitude of 19.30+-0.15 mag. Since then it has been rising, having its most recent detection on October 25, 2024 with a g-band difference magnitude 19.05+-0.15 mag.

We attach figures that display the AT 2024led / ZTF24aarjcbz light curve, based on PSF forced photometry on ZTF difference images (Masci et al. 2023) at its mean location. Such data show no signs of fainter events between the two main ones or prior to the first event.

AT 2024led / ZTF24aarjcbz is located towards the center of SDSS J210618.86-010400.1, a galaxy that has spectroscopic redshift z = 0.0967 in SDSS DR16 (Ahumada+2020). We encourage additional follow-up observations of this transient.
 

This report is based on observations obtained with the Samuel Oschin 48-inch Telescope and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. The ZTF forced-photometry service was funded under the Heising-Simons Foundation grant #12540303 (PI: M. J. Graham). We acknowledge the use of the ALeRCE broker, in particular its Web Interface and the ZTF Forced Photometry Notebook.