2003A&A...410..823L


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET12:23:43

2003A&A...410..823L - Astronomy and Astrophysics, volume 410, 823-831 (2003/11-2)

Intrinsic and dust-induced polarization in gamma-ray burst afterglows: The case of GRB 021004.

LAZZATI D., COVINO S., DI SEREGO ALIGHIERI S., GHISELLINI G., VERNET J., LE FLOC'H E., FUGAZZA D., DI TOMASO S., MALESANI D., MASETTI N., PIAN E., OLIVA E. and STELLA L.

Abstract (from CDS):

Polarization measurements for the optical counterpart to GRB 021004 are presented and discussed. Our observations were performed with the TNG and the VLT-UT3 (Melipal) during the first and fourth night after the gamma-ray burst discovery. We find robust evidence for temporal evolution of the polarization, which is therefore, at least partially, intrinsic to the optical transient. We do not find convincing evidence of wavelength dependence for the intrinsic polarization of the transient, in agreement with current polarization models for optical afterglows. We discuss the role of dust, both in our galaxy and in the host, in modifying the transmitted polarization vector, showing how a sizable fraction of the observed polarized flux is due to Galactic selective extinction, while it is not possible to single out any clear contribution from dust in the host galaxy. We discuss how our data compare to those obtained by different groups showing that a two-component model is required to describe the complete dataset. This is not surprising given the complex lightcurve of GRB 021004.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - polarization - ISM: dust, extinction - radiation mechanisms: non-thermal

CDS comments: NGC 2024 NIR 1 = NAME NGC 2024 IRS 1.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 GRB 021004 gB 00 26 54.68 +18 55 41.6           ~ 518 0
2 CPD-69 177 WD* 03 10 31.0201840720 -68 36 03.381441176 10.757 11.413 11.394 11.47 11.558 DA3.0 239 0
3 NGC 2024 1 Y*O 05 41 37.8540355489 -01 54 36.625596390   13.58 12.17     B0.5V 49 0
4 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1130 1
5 GRB 990510 gB 13 38 07.64 -80 29 48.8           ~ 468 1
6 GRB 020405 gB 13 58 03.12 -31 22 22.2   21.9 21.5     ~ 238 1
7 EGGR 118 WD* 16 17 55.2413312245 -15 35 52.151811413 12.086 13.215 13.425 13.558 13.714 DA1.7 87 0
8 BD-12 5133 * 18 40 01.6962063533 -12 24 06.779458287 11.25 11.39 10.71 10.70   OB- 32 0
9 GRB 020813A gB 19 46 41.874 -19 36 04.81           ~ 287 0
10 BD+28 4211 HS* 21 51 11.0220905905 +28 51 50.366090892 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 744 0
11 GRB 990712 gB 22 31 53.061 -73 24 28.58           ~ 252 1

    Equat.    Gal    SGal    Ecl

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2021.03.02-12:23:43

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