PoS - Proceedings of Science
Volume 328 - Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe (NLS1-2018) - Jetted NLS1s
GeV gamma-ray narrow-line Seyfert 1 galaxies and the Fermi LAT Flare Advocate service
S. Ciprini*  on behalf of the Fermi-LAT Collaboration
Full text: pdf
Pre-published on: November 13, 2018
Published on: December 21, 2018
Since August 2008 the Fermi LAT Flare Advocate service (also known as all-sky Gamma-ray Sky Watcher, FA-GSW) is providing for a quick look and review of the gamma-ray sky observed day by day by the Fermi Large Area Telescope (LAT). The FA-GSW duty is based on high level automatic software pipelines and on shifters compiling analysis and summaries about the gamma-ray sources of the day, their detection and flux/spectral/variability status, their multi-frequency/multi-messenger associations and properties. The first detection of a GeV gamma-ray emitting narrow-line Seyfert 1 (NLSy1) galaxy, with a beamed relativistic jet during the first three months of Fermi LAT observations in 2008, was a milestone for AGN science. More than a dozen of NLSy1 galaxies are claimed to be detected at energies E>100 MeV. Beyond time-integrated LAT catalogs, the detection of daily/weekly scale gamma-ray variability, flares and larger outbursts episodes from radio-loud NLSy1 galaxies, is an important discovery, where the FA-GSW service played a useful role since about 2010.
Some historical remarks on GeV gamma-ray NLSy1 galaxies are here reported, highlighting the Fermi LAT contribution.
DOI: https://doi.org/10.22323/1.328.0020
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.