J/A+A/631/A147 Transient processing and analysis using AMPEL (Nordin+, 2019)
Transient processing and analysis using AMPEL:
alert management, photometry, and evaluation of light curves.
Nordin J., Brinnel V., van Santen J., Bulla M., Feindt U., Franckowiak A.,
Fremling C., Gal-Yam A., Giomi M., Kowalski M., Mahabal A., Miranda N.,
Rauch L., Reusch S., Rigault M., Schulze S., Sollerman J., Stein R.,
Yaron O., van Velzen S., Ward C.
<Astron. Astrophys. 631, A147 (2019)>
=2019A&A...631A.147N 2019A&A...631A.147N (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Redshifts
Keywords: methods: data analysis - astronomical databases: miscellaneous -
virtual observatory tools - supernovae: general -
cosmology: observations
Abstract:
Both multi-messenger astronomy and new high-throughput wide-field
surveys require flexible tools for the selection and analysis of
astrophysical transients.
Here we introduce the alert management, photometry, and evaluation of
light curves (AMPEL) system, an analysis framework designed for
high-throughput surveys and suited for streamed data. AMPEL combines
the functionality of an alert broker with a generic framework capable
of hosting user-contributed code; it encourages provenance and keeps
track of the varying information states that a transient displays. The
latter concept includes information gathered over time and data
policies such as access or calibration levels.
We describe a novel ongoing real-time multi-messenger analysis using
AMPEL to combine IceCube neutrino data with the alert streams of the
Zwicky Transient Facility (ZTF). We also reprocess the first four
months of ZTF public alerts, and compare the yields of more than 200
different transient selection functions to quantify efficiencies for
selecting Type Ia supernovae that were reported to the Transient Name
Server (TNS).
We highlight three channels suitable for (1) the collection
of a complete sample of extragalactic transients, (2) immediate
follow-up of nearby transients, and (3) follow-up campaigns targeting
young, extragalactic transients. We confirm ZTF completeness in that
all TNS supernovae positioned on active CCD regions were detected.
AMPEL can assist in filtering transients in real time, running alert
reaction simulations, the reprocessing of full datasets as well as in
the final scientific analysis of transient data. This is made possible
by a novel way of capturing transient information through sequences of
evolving states, and interfaces that allow new code to be natively
applied to a full stream of alerts. This text also introduces a method
by which users can design their own channels for inclusion in the
AMPEL live instance that parses the ZTF stream and the real-time
submission of high-quality extragalactic supernova candidates to the
TNS.
Description:
The comparison sample that is used to estimate channel efficiencies
was constructed through retrieving all TNS SNe classified as Type Ia
supernovae (not including peculiar subtypes) and with a detection date
between June 5 and September 15, 2018.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 77 310 TNS SNe Ia June 5 to Sep 15, 2018
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Name IAU SN name
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign J2000)
25- 26 I2 deg DEd Declination J2000)
28- 29 I2 arcmin DEm Declination J2000)
31- 35 F5.2 arcsec DEs Declination J2000)
37- 41 F5.3 --- z ? Redshift from galaxy lines or SN features
43- 59 A17 --- ZTF Position w.r.t. ZTF MSIP grid
61- 77 A17 --- Detect Potentially detectably by ZTF MSIP
--------------------------------------------------------------------------------
Acknowledgements:
Jakob Nordin, jnordin(at)physik.hu-berlin.de
(End) Patricia Vannier [CDS] 24-Oct-2019