Upper limit on TeV emission from Fermi J0139.5+2928 measured with FACT

ATel #12891; Adrian Biland (ETHZ), FACT Collaboration
on 26 Jun 2019; 07:15 UT
Credential Certification: Daniela Dorner (dorner@astro.uni-wuerzburg.de)

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FACT has followed-up the newly detected gamma-ray source Fermi J0139.5+2928 and reports an upper limit for the flux at TeV energies.

On June 25 22:16 UTC, the Fermi-LAT Collaboration announced the detection of a new gamma-ray source at GeV energies (ATEL #12888).

FACT performed a follow-up observation on Fermi J0139.5+2928 on June 26 (MJD 58660) from 4:06 UTC till 5:03 UTC. No signal was found from the position R.A. = 24.88 deg, Decl. = +29.47 deg (J2000).

An upper limit of 1.2 times the flux of the Crab Nebula at TeV energies has been determined from the results of an automatic quick look analysis. 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.