Polarimetric constraints on the optical afterglow emission from GRB 990123

Jens Hjorth, Gunnlaugur Björnsson, Michael I. Andersen, Nicola Caon, Luz Marina Cairós, Alberto J. Castro-Tirado, María Rosa Zapatero Osorio, Holger Pedersen, Enrico Costa

Rannsóknarafurð: Framlag til fræðitímaritsGreinritrýni

37 Tilvitnanir (Scopus)

Útdráttur

Polarization of the optical emission from GRB 990123 was measured on 24.17 January 1999 universal time with the Nordic Optical Telescope. An upper limit of 2.3% on the linear polarization was found. Accurate polarization measurements provide important clues to the blast wave geometry and magnetic field structure of gamma-ray bursts (GRBs). The lack of detectable polarization for GRB 990123 indicates that the optical afterglow was produced by a blast wave of unknown geometry with an insignificant coherent magnetic field or by a beamed outflow at high Lorentz factor seen at a small viewing angle. Such a collimated jet would help solve the problem of energy release in this exceptionally luminous cosmological burst.

Upprunalegt tungumálEnska
Síður (frá-til)2073-2075
Síðufjöldi3
FræðitímaritScience
Bindi283
Númer tölublaðs5410
DOI
ÚtgáfustaðaÚtgefið - 26 mar. 1999

Fingerprint

Sökktu þér í rannsóknarefni „Polarimetric constraints on the optical afterglow emission from GRB 990123“. Saman myndar þetta einstakt fingrafar.

Vitna í þetta