2006A&A...449...89G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST07:36:21

2006A&A...449...89G - Astronomy and Astrophysics, volume 449, 89-100 (2006/4-1)

Swift observations of the prompt X-ray emission and afterglow from GRB050126 and GRB050219A.

GOAD M.R., TAGLIAFERRI G., PAGE K.L., MORETTI A., OSBORNE J.P., KOBAYASHI S., KUMAR P., MESZAROS P.I., CHINCARINI G., SAKAMOTO T., ZHANG B., BARTHELMY S.D., BEARDMORE A.P., BURROWS D.N., CAMPANA S., CAPALBI M., COMINSKY L., CUSUMANO G., GEHRELS N., GIOMMI P., GODET O., HILL J.E., KENNEA J.A., KRIMM H., LA PAROLA V., MANGANO V., MINEO T., MORRIS D.C., MUKERJEE K., NOUSEK J.A., O'BRIEN P.T., PAGANI C., PERRI M., ROMANO P. and WELLS A.A.

Abstract (from CDS):

We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ray Bursts GRB050126 and GRB050219A as observed by Swift. The X-ray light-curves of these 2 bursts both show remarkably steep early decays (F(t)∝t–3), breaking to flatter slopes on timescales of a few hundred seconds. For GRB050126 the burst shows no evidence of spectral evolution in the 20-150keV band, and the spectral index of the γ-ray and X-ray afterglows are significantly different suggesting a separate origin. By contrast the BAT spectrum of GRB050219A displays significant spectral evolution, becoming softer at later times, with Γ evolving toward the XRT photon index seen in the early X-ray afterglow phase. For both bursts, the 0.2-10keV spectral index pre- and post-break in the X-ray decay light-curve are consistent with no spectral evolution. We suggest that the steep early decline in the X-ray decay light-curve is either the curvature tail of the prompt emission; X-ray flaring activity; or external forward shock emission from a jet with high density regions of small angular size (>Γ–1). The late slope we associate with the forward external shock.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - gamma rays: observations - black hole physics

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 GRB 050219B gB 05 25 15.990 -57 45 28.70   21.38 20.40     ~ 52 0
2 GRB 050319 gB 10 16 47.900 +43 32 53.80   18.02 17.01     ~ 232 1
3 GRB 050219A gB 11 05 38.990 -40 41 03.00           ~ 80 0
4 GRB 050126 gB 18 32 27.22 +42 22 14.2           ~ 113 0
5 GRB 050315 gB 20 25 54.100 -42 36 02.19           ~ 192 0
6 GRB 050117A gB 23 53 47.24 +65 56 00.2           ~ 57 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-07:36:21

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