MAGIC UPPER LIMITS FOR TWO MILAGRO-DETECTED BRIGHT FERMI SOURCES IN THE REGION OF SNR G65.1+0.6

Authors :: Gonzalez, Becerra
Tridon, Borla
Angelis, De
Cea, De
Pozo, del
Lotto, De
Maria, De
Sabata, De
Mendez, Delgado
Ortega, Diago
Prester, Dominis
Lopez, Garcia
Barbera, La
Moroni, Prada
and, Zandanel
Source :: The Astrophysical Journal; December 2010, Vol. 725 Issue: 2 p1629-1632, 4p
Publication Year :: 2010
Abstract: We report on the observation of the region around supernova remnant G65.1+0.6 with the stand-alone MAGIC-I telescope. This region hosts the two bright GeV gamma-ray sources 1FGL J1954.3+2836 and 1FGL J1958.6+2845. They are identified as GeV pulsars and both have a possible counterpart detected at about 35 TeV by the Milagro observatory. MAGIC collected 25.5 hr of good quality data and found no significant emission in the range around 1 TeV. We therefore report differential flux upper limits, assuming the emission to be point-like ([?] 0.deg1) or within a radius of 0.deg3. In the point-like scenario, the flux limits around 1 TeV are at the level of 3% and 2% of the Crab Nebula flux for the two sources, respectively. This implies that the Milagro emission is either extended over a much larger area than our point-spread function or it must be peaked at energies beyond 1 TeV, resulting in a photon index harder than 2.2 in the TeV band.

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