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GeV emission from SHBL J001355.9-185406

ATEL # 3014; D. Sanchez, S. Fegan (LLR/Ecole Polytechnique/CNRS/IN2P3) on behalf of the Fermi Large Area Telescope Collaboration
on 8 Nov 2010; 20:48 UT
Password Certification: Deirdre Horan (

Subjects: Gamma Ray, >GeV, AGN
Referred to by ATEL #: 3023

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has detected a source positionally consistent with the High energy peaked BL Lac SHBL J001355.9-185406 (R.A: 00:13:56.054 Dec.: -18:54:06.48), recently detected above 300 GeV by the High Energy Stereoscopic System (H.E.S.S., see ATEL # 3007 and references therein).

A preliminary analysis indicates a faint, hard source with a flux, averaged over 2 years of data, above 100 MeV of (0.9 +/- 0.7)x10^9 ph cm^-2 s^-1 and a photon index of 1.5 +/ 0.2 (errors are statistical only). The source was not in the first year LAT Catalog (Abdo et al. 2010, ApJS 188, 405) and is detected with a Test Statistic (TS) = 49 (approximately equivalent to 7 sigma).

Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. The Fermi LAT contact people for this source are D. Sanchez (, and S. Fegan (

The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.

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