Title: Monitoring the Gamma-ray/Radio-Star 2CG135+01/LSI 61 303
Proposal ID: 0120232
Subject category: Compact Object
Principal investigator: Tavani
Institute: Istituto di Fisica Cosmica "G. Occhialini" - IFC/CNR
Abstract
We propose to carry out a sequence of 3 INTEGRAL observations accumulating about 10^6 sec of the field
containing the unidentified gamma-ray source 2CG 135+01. Previous gamma-ray and X-ray observations of 2CG
135+01 show interesting time variability of the high-energy emission. We request a dedicated series of three
INTEGRAL pointings that we plan to carry out in conjunction with simultaneous radio monitoring of the
possible counterpart LSI +61 303 and AGILE gamma-ray monitoring of the field. Detection by INTEGRAL of
intensity and spectral variability of hard X-ray and soft gamma-ray emission from LSI +61 303 would
substantially contribute to resolving the problem of identification and nature of the 2CG 135+01
counterpart. The nature of 2CG 135+01 is of grat relevance in identifying a possible new class of variable
gamma-ray sources near the Galactic plane.