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
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.