Fermi LAT detection of a possible new extragalactic gamma-ray source in the vicinity of TXS 1530-131 (PMN J1532-1319)
ATel #3579; D. Gasparrini (ASDC/INAF) and S. Cutini (ASDC/INAF) on behalf of the Fermi Large Area Telescope Collaboration
on 24 Aug 2011; 13:43 UT
Credential Certification: Dario Gasparrini (dario.gasparrini@asdc.asi.it)
Subjects: Gamma Ray, >GeV, AGN, Quasar
Referred to by ATel #: 3629
The Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope, has observed a gamma-ray flare from a new gamma ray source.
The preliminary best-fit location of the gamma-ray source (RA=233.16 deg, DEC= -13.35 deg, J2000) has a 95% containment radius of 0.32 deg (statistical errors only) for observations from May 23 to August 23, 2011. The flat spectrum radio source TXS 1530-131 (also known as PMN J1532-1319) (RA: 15h32m45.3747s, Dec: -13d19m10.086s, J2000, Kovalev et al. 2007, AJ, 133, 1236) lies on the edge of this error circle.
Preliminary analysis indicates that the source brightened in gamma rays on August 22, 2011, with a daily flux (E>100MeV) of (1.2 +/- 0.4) x 10^-6 ph cm^-2 s^-1 (errors are statistical only). The source is not present in any of Fermi LAT catalogs released up to now and there is no previously reported EGRET gamma-ray detection at this location.
Because Fermi operates in all-sky survey mode, gamma-ray monitoring of this source will continue. In consideration of the activity of this source we strongly encourage multiwavelength observations. The Fermi LAT contact person for this source is S. Cutini (cutini@asdc.asi.it).
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.
