ANTARES processes alerts from the Zwicky Transient Facility survey in real-time, using filters written in Python, and streams the results out using Apache Kafka.


To get started, request an account and then browse the current streams and alerts. To receive automatic notifications of new alerts, sign up for the Slack channel. If you have an @noao.edu email address, click here. If you don't have an @noao.edu email address, contact the ANTARES team to request a slack account. If you want to download alerts in bulk or stream them to your computer in real-time, install the Client Library.


The current high-level processing of ANTARES retains alerts that pass certain image-quality tests. ZTF assesses whether or not a given alert is likely to be real or an artifact. Alerts that fall below a threshold value for this assessment (ztf_rb < 0.55) are ignored and not included in the ANTARES database. In addition, alerts with bad pixels (ztf_nbad > 0) or a large difference in aperture vs PSF magnitudes (ztf_magdiff outside of the range -0.1 to 0.1) are also ignored. This portion of the alert stream is evaluated for known Solar System objects. After this evaluation, alerts with poor seeing (ztf_fwhm > 5.0 arcsec) or elongated sources (ztf_elong > 1.2) are ignored and not included in the ANTARES database. (Note that, if a source is not included in our database, but has a later alert that passes our criteria, then history from the ZTF alert packet is stored.) ANTARES then runs our other science filters, but only on alerts with at least two detections. Alerts with only one detection are likely to be unknown Solar System objects, so we wait for a second detection at the same location. Alerts with one detection are stored in the database so they can be associated with later alerts.

Latest alerts from the Nuclear Transient filter

The nuclear transient filter aims at identifying transients close to the center of a galaxy. We are particularly interested in, but not limited to, finding tidal disruption events (TDEs) which are stars torn apart by and accreted onto the black hole in the center of a galaxy. TDEs can shed lights on the black hole accretion and jet formation. For this, we use the criteria by van Velzen et al. (2018) that locate alerts within 0.6" of a galaxy.

Acknowledgments
The ANTARES project has been supported by the National Science Foundation through a cooperative agreement with the Association of Universities for Research in Astronomy (AURA) for the operation of NOAO, through an NSF INSPIRE grant to the University of Arizona (CISE AST-1344024, PI: R. Snodgrass), and through a grant from the Heising-Simons Foundation.
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.