SUMMARY OF PROPOSAL 41155 DR. TADAYUKI TAKAHASHI INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE KANAGAWA JAPAN 229 SAGAMIHARA 3-1-3 YOSHINODAI E-mail: TAKAHASI@ASTRO.ISAS.AC.JP Tel: 0427-51-3911 Fax: 0427-59-4240 Medium: 2.5GB8MM Subject: AGN Title: IDENTIFICATION OF THE GALACTIC UNIDENTIFIED EGRET SOURCE --- 2EG J2020+4026 Abstract: EGRET has found almost 30 Gamma-ray sources near the galactic plane (gb <+-10 deg). Among them five sources are identified as pulsars, such as Geminga. However, most of them have not been identified with any known sources. A few hundred MeV to GeV emission from galactic source is particulary interesting. Pulsar could be one possibility and galactic objects with jets directed toward the solar system could be another possibility. Because of the high galactic absorption, hard X-ray observation with ASCA is crucial to reveal the nature of the source. We propose to observe the brightest, thus with the smallest error circle, unidentified EGRET source, near Cygnus Complex. Co-Is: 1 KEIICHI MATSUZAKI UNIV. OF TOKYO JAPAN (No Co-I contact data) 2 YOSHITAKA SAITO UNIV. OF TOKYO JAPAN 3 YUTARO SEKIMOTO UNIV. OF TOKYO JAPAN 4 MASAHARU HIRAYAMA UNIV. OF TOKYO JAPAN 5 KAZUO MAKISHIMA UNIV. OF TOKYO JAPAN 6 NORIKO YAMASAKI TOKYO METRO. UNIV. JAPAN Target Name PRI RA Dec Time TC Off GIS SIS_Cts Obs ------------------- --- -------- -------- ---- -- --- --- ------- --- 2EG J2020+4026 1 305.1400 40.4400 40 N N P 0.10000 1