DRAFT
2024-12-11 21:54:47
Type: Object/s-Discovery/Classification
Bibcode: 2024TNSAN.366....1F
AT2024advj : a fast-rising, red, extragalactic transient in UGC 00604 (70 Mpc)
Authors: M. Fulton, (QUB), S. J. Smartt, S. Srivastav, J. Gillanders, H. Stevance, K. W. Smith (Oxford), T.-W. Chen (NCU), C. Angus, D. R. Young, M. Nicholl (QUB), R. Williams, G. Francis (Edinburgh)
Source Group: OxQUB
Keywords: Supernova, Transient
Abstract:
We highlight the fast-rising and red extragalactic transient AT2024advj (ZTF24abxpkhb) found in the ZTF public alert stream. The Fritz science team registered it on the TNS as a young supernova candidate. Our Fastfinder annotator on the Lasair broker flagged its fast-rising nature and red colour. The transient rose at a rate of 1.5 mags per day in the ZTF g-band from forced photometry and is currently bright in the ZTF r-band at m_r = 17.38 +/- 0.04. The source is offset 21.84" N, 22.52" W (10.6 Kpc) from the likely host galaxy UGC 00604, which is at z = 0.017 or d = 70 Mpc (redshift independent, from NED), implying an absolute magnitude of M = -17.1 (assuming m-M = 34.22 and A_r = 0.261). When considering galactic extinction, we measure a colour of g-r = 0.38 +/- 0.06 at the time of discovery.

ZTF24abxpkhb is a transient in the ZTF public alert stream. The Fritz science data platform for the Zwicky Transient Facility discovered the source and reported it to the TNS as AT2024advj, resembling a young and bright SN candidate as identified autonomously by their BTSbot (Rehemtulla et al. 2024; arXiv:2401.15167).

The Lasair broker (Williams et al. 2024, RASTI, 3, 362) flagged the source as a fast-rising and red extragalactic transient through the automated Fastfinder annotator (Fulton et al. in prep) designed to highlight rapid transients. The ZTF forced photometry shows a rising rate of dg/dt = 1.5 mags per day. It is red, with a current mag of m_r = 17.38 +/- 0.04 on 60655.281 (2024-12-11 06:44:11) and a g-r colour of 0.38 +/- 0.06 at the time of discovery when considering galactic extinction.

The source is located approximately 21.84" N, 22.52" W (10.6 Kpc) from the likely host galaxy UGC 00604, which is at z = 0.017 or d = 70 Mpc (redshift independent, from NED). This implies an absolute magnitude of M_r = -17.10 +/- 0.16 (assuming m-M = 34.22 and A_r = 0.261).

The lightcurve is available on the Lasair broker pages: https://lasair-ztf.lsst.ac.uk/objects/ZTF24abxpkhb along with access to the Fastfinder annotator. We strongly encourage follow-up observations.

Lasair is supported by the UKRI Science and Technology Facilities Council and is a collaboration between the University of Edinburgh (grant ST/N002512/1), Queen’s University Belfast  and University of Oxford (grant ST/N002520/1) within the LSST:UK Science Consortium. ZTF is supported by National Science Foundation grant AST-1440341 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington, Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW. This research has made use of ``Aladin sky atlas’‘ developed at CDS, Strasbourg Observatory, France.

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 2024advj [ZTF24abxpkhb] 00:58:33.386 +45:00:40.63 UGC 00604 0.017 00:58:33.390 +45:00:40.72 SN IIn 0.017

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