1ES 2344+51.4 in High State at TeV Energies

ATel #13165; Adrian Biland (ETHZ) for the FACT Collaboration
on 4 Oct 2019; 16:44 UT
Credential Certification: Daniela Dorner (dorner@astro.uni-wuerzburg.de)

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FACT reports an enhanced flux from the high-frequency peaked BL Lac type object (HBL) 1ES 2344+51.4 at TeV energies during the last two nights.

Since summer 2012, FACT is monitoring 1ES 2344+51.4 (z=0.044) at TeV energies and has collected a total of more than 1900 hours of physics data in the last seven years. In previous studies, the source showed extreme behaviour during high state.

Last night, FACT observed the source from 2019/10/03 23:06 UTC to 2019/10/04 1:30 UTC. Preliminary results of an automatic quick-look analysis can be found at: https://fact-project.org/monitoring/index.php?y=2019&m=10&d=03&source=3&timebin=3&plot=night With a peak flux of ~1.3 times the flux of the Crab Nebula (CU) at TeV energies at the beginning of the night, the source showed an average flux of 0.8 CU for the whole night.
Already the night before (observations took place from 2019/10/03 0:33 UTC to 2019/10/03 1:32 UTC), an enhanced flux level of 0.7 CU has been measured, and the flux shows an increasing trend over the last week: https://fact-project.org/monitoring/index.php?y=2019&m=10&d=03&source=3&timebin=12&plot=week
The FACT contact person for this source is Daniela Dorner (dorner@astro.uni-wuerzburg.de)

The First G-APD Cherenkov Telescope (FACT) is an imaging air Cherenkov telescope with 9.5 sqm mirror area located in the Observatorio del Roque de los Muchachos on the Canary Island La Palma. It is pioneering the usage of silicon photosensors and monitoring bright variable sources at energies above 750 GeV. The Collaboration includes ETH Zurich and the Universities of Dortmund, Geneva and Wuerzburg.