Fermi LAT detection of a new high-energy transient gamma-ray source Fermi J0751-5136
ATel #9340; D. Kocevski (GSFC/NASA), S. Buson (GSFC/NASA) on behalf of the Fermi Large Area Telescope Collaboration
on 8 Aug 2016; 16:16 UT
Credential Certification: Daniel Kocevski (dankocevski@gmail.com)
Subjects: Gamma Ray, >GeV, TeV, VHE, AGN, Black Hole, Blazar, Variables
During the week from 18 July through 25 July, 2016, the Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, observed gamma-ray activity from a previously unidentified transient source. The significance of the source detection for the entire LAT exposure from 18 July and 25 July, 2016 between 100-800 MeV and 0.8-300 GeV is roughly 6 and 7 sigma respectively. The source appears to have been slowly increasing in brightness in the 0.8-300 GeV energy range over the past 8 weeks. The best-fit location of the gamma-ray source is RA = 117.75 deg, Dec = -51.61 deg, J2000, with 95% confidence that the source is within 0.12 deg of this position (statistical errors only). \n
A preliminary spectral analysis of the source indicates that the source brightened in gamma rays to a flux (E > 100 MeV) of 1.4 +/- 0.3 x10^-7 ph cm^-2 s^-1, with a spectral index of 2.04 +/- 0.14 (errors are statistical only).
A search of the NASA Extragalactic Database (NED) within the 95% containment radius reveals a flat-spectrum radio source, PMN J0751-5134, that is approximately 2 arcminutes from the LAT localization and well within our 95% error circle. A Swift ToO has been submitted and accepted for this source. Because Fermi provides all-sky coverage, regular gamma-ray monitoring of this source will continue.
Multiwavelength observations during the ongoing activity of this source are strongly encouraged. The Fermi LAT contact person for Fermi J0751-5136 is Daniel Kocevski (e-mail: daniel.kocevski@nasa.gov). Additional details regarding this source can be found at the Fermi All-sky Variability Analysis (FAVA) data portal hosted at the Fermi Science Support Center at the URL enclosed below.
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.
http://fermi.gsfc.nasa.gov/ssc/data/access/lat/FAVA/SourceReport.php?week=417&flare=29
