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Fermi LAT detection of increasing gamma-ray activity from the FSRQ PKS 1730-13

ATel #3002; F. D'Ammando (INAF-IASF Palermo), J. Vandenbroucke (Stanford/KIPAC) on behalf of the Fermi Large Area Telescope Collaboration
on 3 Nov 2010; 15:01 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Filippo D'Ammando (filippo.dammando@iasf-roma.inaf.it)

Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar, Quasar

The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope has observed an increasing gamma-ray flux from a source positionally consistent with the Flat Spectrum Radio Quasar PKS 1730-13 (also known as NRAO 530 and 1FGL J1733.0-1308, Abdo et al. 2010, ApJS, 188, 405; R.A: 17:33:02.7057 Dec.: -13:04:49.547, J2000, Johnston et al. 1995, AJ 110, 880) at redshift z=0.902 (Junkkarinen 1984, PASP 96, 539).

The source was detected in a high state between October 31 and November 2, 2010. Preliminary analysis indicates that on November 2, 2010 the flare reached a gamma-ray flux (E > 100MeV) of (1.7+/-0.3)x10^-6 photons/cm^2/s (errors are statistical only), which represents an increase of a factor of 20 with respect to the average source flux observed in the first eleven months of Fermi observations (Abdo et al. 2010).

Because Fermi operates in an all-sky scanning mode, regular 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 people for this source are J. Vandenbroucke (justinv@stanford.edu), and F. D'Ammando (dammando@ifc.inaf.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.