Support for the Interplanetary Network

This proposal requests one year of support for a portion of the Interplanetary Network, which localizes cosmic gamma-ray bursts by triangulation. It is, in effect, a full-time, all- sky monitor of transient gamma-ray activity. The network consists of nine spacecraft, each of which is in a different category with respect to NASA funding. One, AGILE, is an Italian mission which never received NASA support, while three others (Fermi, MESSENGER, and Swift) are NASA missions which are currently supported. Another (Odyssey) is a NASA mission whose data are not in the public domain. Although their data are used in the network, they are not the object of this proposal. Financial support is requested for the remaining 4 missions (INTEGRAL, RHESSI, Suzaku, and Wind) in the network, some of which continue to have guest investigator (GI) programs, but none of which supports GI s financially.