{
  "bibcode": "2023GCN.33255....1Y",
  "body": "S. Yang (Stockholm), T.-W. Chen (TUM/MPA), H.-Y. Hsiao, Y.-C. Pan, C.-C. Ngeow, W.-J. Hou, C.-S. Lin, H.-C. Lin, and J.-K. Guo (IANCU) report:\n\nWe observed the field of ZTF23aabmzlp/AT2023azs (Andreoni et al., GCN 33229), using the Lulin One-meter Telescope (LOT) at Lulin Observatory, Taiwan, to obtain g,r,i-band images as part of the Kinder collaboration (Chen et al., AstroNote 2021-92).\n\nThe first epoch of observations started at 20:51 UT on 28 of January 2023 (MJD = 59972.869), 0.61 days after the first detection from ZTF. The images were combined from 3 frames with 300 sec exposure time for g and r bands, and 2 frames with 300 sec exposure time for i band, taken under poor seeing conditions (4\".0 average) and at a median airmass of 1.5. The second epoch was performed at 20:38 UT on 29 of January 2023 (MJD = 59973.860). The images were combined from 2 frames with 300 sec exposure time for each band, taken under variable seeing conditions (1\".8 average) and at a median airmass of 1.5.\n\nWe used PSF photometry to measure the transient brightness with template subtraction using the SDSS images, and derived the following preliminary magnitudes and 3-sigma limits (all in the AB system):\n\n2023-01-28:\ng > 20.18 mag,\nr > 19.21 mag, and\ni > 19.13 mag.\n\n2023-01-29:\ng > 21.82 mag,\nr = 21.78 +/- 0.15 mag, and\ni = 21.34 +/- 0.13 mag.\n\nGiven magnitudes are calibrated against SDSS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.01 mag in the direction of the counterpart (Schlafly & Finkbeiner 2011).\n\nOur measurements of the photometric evolution of ZTF23aabmzlp/AT2023azs are consistent with previous optical observations reported from Kumar et al., GCN 33230; Gupta et al., GCN 33237; Pankov et al., GCN 33239; Strausbaugh et al., GCN 33241.",
  "circularId": 33255,
  "createdOn": 1675438858000,
  "email": "janet.chen@astro.su.se",
  "subject": "ZTF23aabmzlp/AT2023azs: Lulin 1m LOT optical observations",
  "submitter": "Ting-Wan Chen at MPE  <janet.chen@astro.su.se>",
  "eventId": "ZTF23aabmzlp"
}