DRAFT
2024-12-06 17:31:49
Type: Object/s-Discovery/Classification
AT2024adec : a fast, blue, extragalactic transient in ZTF alert stream
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
Abstract:
We highlight the fast rising and fast declining extragalactic transient AT2024adec (ZTF24abvevzs) found in the ZTF public alert stream. It was registered on the TNS by the ALeRCE team as a young supernova candidate. The fast rising and fading nature was flagged by our Fastfinder annotator on the Lasair broker. It rose at rate of 0.75 mag per day, peaking at g=18.5 and faded by 1 mag in two days. It is g=19.5 on 2024-12-06 12:48 UT. The source is offset from a g=17.97 diffuse, blue host galaxy at a photometric redshift of z=0.038 from the Legacy Survey DR9 Photoz catalogue ; https://lasair-ztf.lsst.ac.uk/objects/ZTF24abvevzs/

ZTF24abvevzs is a transient in the ZTF public alert stream, which was reported to the TNS as AT2024adec by the ALeRCE broker team (Forster et al. TNSTR 4717) as a young SN candidate, as classified by the ALeRCE stamps classifier : https://alerce.online/object/ZTF24abvevzs

The source was flagged by the Lasair broker (Williams et al. 2024, RASTI, 3, 362) as a fast evolving extragalactic transient, through the automated Fastfinder annotator (Fulton et al. in prep) designed to highlight rapid transients. The ZTF forced photometry shows a 2 day rise to peak at a rate of dg/dt=0.75 mag per day and a decline rate in the g-band of dg/dt=0.5 mag per day. It is blue, with a peak mag of g=18.5.

The source is located approximately 10 arsec from an extended source in the Legacy and Pan-STARRS catalogues. The Legacy Survey reports a photometric redshift of z = 0.038 +/- 0.012 for the apparent host. Follow-up is encouraged particularly spectroscopy of the transient and the host. The latter to determine a spectroscopic redshift, which is still uncertain. The host is g = 17.97 mag. 

The last mag from ZTF is g=19.45 +/- 0.11 on 60650.533484 (20241-2-06 12:48:13 UT). The lightcurve is available on the Lasair broker pages https://lasair-ztf.lsst.ac.uk/objects/ZTF24abvevzs/ along with access to the Fastfinder annotator.


Lasair is supported by the UKRI Science and Technology Facilities Council and is a collaboration between the University of Edinburgh (grant ST/N002512/1) and Queen’s University Belfast (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 2024adec [ZTF24abvevzs] 12:56:57.007 +77:10:26.53 WISEA J125659.47+771029.8 12:56:57.027 +77:10:26.82 SN IIb 0.035

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