Possible INTEGRAL counterpart of the AGILE high energy variable source
ATel #1313; Sguera V., Malizia A. (INAF/IASF Bologna), Bazzano A., Ubertini P. (INAF/IASF Roma), Bird A. J.,Dean A. J. (Univ. Southampton)
on 29 Nov 2007; 16:51 UT
Credential Certification: Vito Sguera (sguera@astro.soton.ac.uk)
Subjects: Gamma Ray, Transient
Following the report of the AGILE detection of a strongly variable source in the Cygnus region
(ATel #
1308),
we note that within the Agile
error box there are a number of high energy sources at E>10 keV
(see figure from the link below):
-- The MILAGRO TeV source MGRO J2019+37 which is however extended and diffuse.
-- The EGRET source 3EG J2021+3716 = GeV J2020+3658 (Mallory S. E. Roberts et al. 2002, ApJ, 577, L19) which has been
likely associated
with the pulsar PSR J2021.1+3651; this source is not expected to be variable at high energies.
-- The EGRET source 3EG J2016+3657 (Halpern et al. 2001, ApJ, 551, 1016) which has been
associated with the blazar B2013+370;
this source is expected to be variable at high energies however
it is located outside the AGILE error circle.
-- The INTEGRAL source IGR J20188+3647 (Sguera et al. 2006, ATel #
873) which is located inside the AGILE error circle;
it is very variable as it was
detected by IBIS in only one observation lasting about 2,000 seconds in the 17-30 keV band with a flux of about 30 mCrab.
Therefore, we suggest that the
IBIS source IGR J20188+3647 is the possible counterpart of the AGILE transient source.
Image available here
