GCN Circular 34042
Subject
AT2023lcr: Pan-STARRS & ATLAS Observations
Date
2023-06-20T18:50:23Z (a year ago)
From
Michael Fulton at Queen's U, Belfast <mfulton07@qub.ac.uk>
M. D. Fulton (QUB), S. J. Smartt (Oxford/QUB), T.-W. Chen (TUM), K. W. Smith, S. Srivastav, D. R. Young, M. Nicholl, M. McCollum, T. Moore, J. Weston, X. Sheng (QUB), A. Aamer (QUB/Birmingham), L. Shingles (GSI/QUB), H. Stevance, L. Rhodes, A. Andersson (Oxford), K. C. Chambers, M. E. Huber, A. S. B. Schultz, T. de Boer, J. Bulger, J. Fairlamb, H. Gao, C. C. Lin, T. Lowe, E. Magnier, P. Minguez, I. A. Smith, R. J. Wainscoat, L. Denneau, J. Tonry, H. Weiland, A. Lawrence, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), A. Rest (STScI), C. Stubbs (Harvard), J. Sommer (LMU/QUB)
We note that the transient reported by Swain et al. (Astronote 2023-178, GCN34022) as ZTF23aaoohpy/AT2023lcr was discovered by ATLAS and reported to the transient name server before the ZTF announcement (ATLAS23msn; Tonry et al. 2023, TNS Astronomical Transient Report No. 180429). ATLAS discovered the object, and the ZTF team (Swain et al.) discovered the fast-fading nature (see Fulton et al. Astronote #2023-179). The fast-fading nature was confirmed by GOTO survey operations (Gompertz et al. GCN 34023).
Here we report Pan-STARRS targeted follow-up observations and ATLAS survey data. Observations were performed during the early hours of 2023-06-20 between 07:34:15.74 UTC and 08:15:20.74 UTC in g/r/i/z filters.
The transient is well detected in the g, r, i, and z filters, and we measure the following epochs through forced photometry.
| MJD | Inst. | Filter | Mag +/- MagErr |
|:---------:|:----------:|:------:|:--------------:|
| 60113.405 | ATLAS | c | 19.3 +/- 0.1 |
| 60115.318 | Pan-STARRS | g | 21.5 +/- 0.1 |
| 60115.333 | Pan-STARRS | r | 21.2 +/- 0.1 |
| 60115.338 | Pan-STARRS | i | 20.9 +/- 0.1 |
| 60115.343 | Pan-STARRS | z | 20.8 +/- 0.1 |
Note that the ATLAS filter c is a g+r composite. To a reasonable approximation, c = (g+r)/2.
Operation of the Pan-STARRS1 and Pan-STARRS2 telescopes is primarily supported by the National Aeronautics and Space Administration under Grant No. NNX12AR65G and Grant No. NNX14AM74G issued through the SSO Near-Earth Object Observations Program. Data are processed at Queen's University Belfast enabled through the STFC grants ST/P000312/1 and ST/T000198/1.
The Asteroid Terrestrial-impact Last Alert System (ATLAS) project is primarily funded to search for Near-Earth asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogs from the survey area. This work was partially funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889, and STFC grants ST/T000198/1 and ST/S006109/1. The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, the Queen's University Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory, and The Millennium Institute of Astrophysics.