DRAFT
2022-06-05 16:38:12
Type: Object/s-Discovery/Classification
Bibcode: 2022TNSAN.121....1F
AT2022lnd is a fast declining transient associated with a faint extended host object
Authors: M. Fulton, S. Srivastav, S. J. Smartt, K. W. Smith, D. R. Young, J. Gillanders, T. Moore (QUB), L. Shingles (GSI/QUB), 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, R. J. Wainscoat, L. Denneau, J. Tonry, H. Weiland (IfA, Univ. Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), J. Anderson (ESO), A. Jordan, V. Suc (UAI, Obstech), M. Nicholl (Birmingham), T.-W. Chen (Stockholm), A. Rest (STScI), C. Stubbs (Harvard)
Source Group: Pan-STARRS
Keywords: Supernova, Transient
Abstract:
Here we highlight the fast-evolving nature of AT2022lnd through combining ZTF, Pan-STARRS and ATLAS survey data. The transient was discovered by ZTF (ZTF22aalwamk) on MJD 59729.37 (2022-05-30 08:58:33 UT) at a magnitude of m_g = 19.64 +/- 0.21. Survey mode observations were conducted by Pan-STARRS2 on MJD 59731.36 (m_w = 18.59 +/- 0.01) and on MJD 59733.43 (m_w = 19.21 +/- 0.01), implying a rapid two-day rise time to peak brightness followed by a decline rate of ~0.3 mag per day. AT2022lnd could still be a CV if the apparently extended host is a stellar blend, however, an extragalactic FBOT is also plausible. Further follow-up is strongly encouraged.

Here we highlight the fast-evolving nature of AT2022lnd by combining data from the ZTF survey (Bellm et al. 2019 2019PASP..131a8002B) processed through the Lasair broker (Smith et al. 2019 2019RNAAS...3a..26S), the  Pan-STARRS Survey for Transients (Chambers et al. 2016 2016arXiv161205560C) and the ATLAS survey (Smith et al. 2020 2020PASP..132h5002).

The transient was discovered by ZTF (ZTF22aalwamk) on MJD 59729.37 (2022-05-30 08:58:33 UT) at a magnitude of m_g = 19.64 +/- 0.21. There was no detection by ZTF three days prior. The transient was further observed by ZTF on MJD 59731.316 (2022-06-01 07:34:39) measuring m_g = 18.78 +/- 0.10 and on MJD 59733.246 (2022-06-03 05:53:47) measuring m_r = 19.37 +/- 0.10.

AT2022lnd was also observed by Pan-STARRS2 and ATLAS during normal survey operations. The stacked forced photometry for these observations is as follows. Magnitudes are quoted in the AB system.

MJD Filter Mag Mag Error
59730.39 ATLAS o 18.76 0.08
59731.36 PS w 18.59 0.01
59732.38 ATLAS c 19.00 0.06
59733.43 PS w 19.21 0.01
59734.37 ATLAS c 19.43 0.11

Using forced photometry across the epochs, we measure a rapid two-day rise time of ~0.5 mag per day to peak followed by a decline rate of ~0.3 mag per day in the ATLAS and Pan-STARRS passbands. 

AT2022lnd is offset by 0.7 arcsecs from a faint blue host object which appears extended in the DECALS and deep PS w-band reference images. This host has measured g- and r-band magnitudes of 22.5 and 22.3 respectively in the Legacy Surveys DR9 catalogue. AT2022lnd could be a CV if this apparently extended host is a stellar blend, however, an extragalactic FBOT is also plausible.

Further follow-up is strongly encouraged.

Lasair is supported by the UKRI STFC through funding to the University of Edinburgh (ST/N002512/1) and Queen’s University Belfast (ST/S006109/1) and we acknowledge data access to the Zwicky Transient Facility public data stream. The Pan-STARRS telescopes are supported by  NASA Grants NNX12AR65G and NNX14AM74G and data are processed at Queen's University Belfast enabled through the STFC grants ST/P000312/1 and ST/T000198/1. ATLAS is primarily funded through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575. The ATLAS science products are provided by the University of Hawaii, QUB, STScI, SAAO  and Millennium Institute of Astrophysics in Chile.

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 2022lnd [ZTF22aalwamk] 15:01:10.232 -06:50:36.25 15:01:10.232 -06:50:36.25 CV

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