1999A&A...348L...1C


Query : 1999A&A...348L...1C

1999A&A...348L...1C - Astronomy and Astrophysics, volume 348, L1-4 (1999/8-1)

GRB 990510: linearly polarized radiation from a fireball.

COVINO S., LAZZATI D., GHISELLINI G., SARACCO P., CAMPANA S., CHINCARINI G., DI SEREGO S., CIMATTI A., VANZI L., PASQUINI L., HAARDT F., ISRAEL G.L., STELLA L. and VIETRI M.

Abstract (from CDS):

Models for gamma-ray burst afterglows envisage an hyper-relativistic fireball that is decelerated in the ambient medium around the explosion site. This interaction produces a shock wave which amplifies the magnetic field and accelerates electrons to relativistic energies, setting the conditions for an efficient production of synchrotron photons. If produced in a region of large-scale ordered magnetic field, synchrotron radiation can be highly polarized. The optical transient associated with GRB 990510 was observed ∼18.5hr after the event and linear polarization in the R band was measured at a level of 1.7±0.2%. This is the first detection of linear polarization in the optical afterglow of a gamma-ray burst. We exclude that this polarization is due to dust in the interstellar material, either in our Galaxy or in the host galaxy of the gamma-ray burst. These results provide important new evidence in favor of the synchrotron origin of the afterglow emission, and constrains the geometry of the fireball and/or magnetic field lines.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - polarization - radiation mechanisms: non-thermal

Nomenclature: Fig.1: [CLG99] A (Nos A-B).

Errata: Erratum vol. 351, p. 399 (1999)

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 OT 19990510 ? 13 38 07.11 -80 29 48.2           ~ 5 0
2 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 477 1
3 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 974 1
4 BD-12 5133 * 18 40 01.6961497488 -12 24 06.777653508 11.25 11.39 10.71 10.70   OB- 34 0
5 BD-13 5073 Be* 18 41 22.5614843136 -13 50 29.040846684 10.72 10.98 10.20 10.43   B3e 26 1
6 [BHR99] A * ~ ~   21.38 20.03     K6V: 3 0
7 [BHR99] B * ~ ~           K5V: 3 0

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2022.09.28-01:34:45

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