Proposal code

w014

Proposal title

The Flaring CGRO Blazar 2255-282

The

Investigators and their

Affiliations

P.I. J. S. Ulvestad NRAO, USA
W. T. Vestrand Univ. New Hampshire, USA
J. G. Stacy LSU \& Southern Univ., USA
J. A. Biretta STScI, USA

Proposal Abstract

We propose 5-GHz observations of the flaring gamma-ray blazar 2255-282. This source underwent a millimeter outburst in late 1997; a gamma-ray outburst more than a factor of 20 stronger than previous upper limits was detected in January 1998. A similar millimeter outburst, and perhaps an undetected gamma-ray flare, took place in mid-1994. Blazar models predict emergence of a new VLBI jet component months to years after a gamma-ray flare, with an apparent speed that is predictable from the multiwavelength properties of the outburst. We propose to search for a jet component generated in the 1994 outburst of 2255-282, and will also propose high-frequency VLBA observations to measure the component spectrum. If VSOP is still operational, we intend to request a second epoch to be observed in mid-2000, to measure the motion of the 1994 component and search for a component associated with the 1997/98 flare.

The full Cover Sheets (compressed post-script, typically 50kbytes) can be retrieved. Note that many proposals were reduced in extent by the Scientific Review Committee (e.g. by reducing the number of experiments), however the Cover Sheets contain the full proposal as submitted. Also note that AO2 proposals were submitted in May 1998, and information such as affiliations and contact details has changed for some proposers since that time. The Cover Sheets (and the details on this page, which were derived from the Cover Sheets) may therefore have changed.