A new flaring high energy gamma-ray source

Abstract

We report the detection of a new gamma-ray source in the Fermi-LAT sky using a source detection tool based on the Minimal Spanning Tree algorithm. The source, not reported in previous LAT catalogues but very recently observed in the X-rays and optical bands, is characterized by an increasing gamma-ray activity in 2012 June-September, reaching a weekly peak flux of (3.3+-0.6)*10^-7 photons cm^-2 s^-1. A search for a possible counterpart provides indication that it can be associated with the radio source NVSS J141828+354250 whose optical SDSS colours are typical of a blazar.

4 pages, 3 figures. Accepted for publication in Astronomy & Astrophysics

References in corpus (7)

• Fermi Large Area Telescope Second Source Catalog
• Identification of the infrared non-thermal emission in Blazars
• The WISE gamma-ray strip parametrization: the nature of the gamma-ray Active Galactic Nuclei of Uncertain type
• Unidentifed gamma-ray sources: hunting gamma-ray blazars
• A MST algorithm for source detection in gamma-ray images
• The colours of BL Lac objects: a new approach to their classification
• gamma-ray DBSCAN: a clustering algorithm applied to Fermi-LAT gamma-ray data. I. Detection performances with real and simulated data

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