The Third Interplanetary Network

摘要

The 3rd interplanetary network (IPN), which has been in operation since 1990, presently consists of 9 spacecraft: AGILE, Fermi, RHESSI, Suzaku, and Swift, in low Earth orbit; INTEGRAL,in eccentric Earth orbit with apogee 0.5 light-seconds; Wind, up to approx7 light-seconds from Earth; MESSENGER, en route to Mercury; and Mars Odyssey, in orbit around Mars. The IPN operates as a full-time, all-sky monitor for transients down to a threshold of about 6X10~(-7) erg cm~(-2) or 1 photon cm~(-2) s~(-1). It detects approx335 cosmic gamma-ray bursts per year. These events are generally not the same ones detected by narrower field of view instruments such as Swift, INTEGRAL IBIS, SuperAGILE, and MAXI; the localization accuracy is in the several arcminute and above range. The data are publicly available and can be utilized for a wide variety of studies.