2011A&A...531L...6N


Query : 2011A&A...531L...6N

2011A&A...531L...6N - Astronomy and Astrophysics, volume 531, L6-6 (2011/7-1)

GRB 090426: discovery of a jet break in a short burst afterglow.

NICUESA GUELBENZU A., KLOSE S., ROSSI A., KANN D.A., KRUEHLER T., GREINER J., RAU A., OLIVARES E.F., AFONSO P.M.J., FILGAS R., KUEPCUE YOLDAS A., McBREEN S., NARDINI M., SCHADY P., SCHMIDL S., UPDIKE A.C. and YOLDAS A.

Abstract (from CDS):

The link between the duration of GRBs and the nature of their progenitors remains disputed. Short bursts (with durations of less than ∼2s) are less frequently observed, technically more difficult to localize, and exhibit significantly fainter afterglows. It is of critical importance to establish whether the burst duration can reliably distinguish the different GRB population models of collapsars and compact stellar mergers. The Swift GRB 090426 provides an unique opportunity to address this question. Its duration (T90=1.28s) places GRB 090426 firmly in the short burst population, while the high redshift (z=2.609), host galaxy properties, and prompt emission spectral characteristics are more similar to those of long-duration GRBs. On the basis of data obtained with the Tautenburg 2m telescope (Germany) and the 7-channel imager GROND (La Silla, Chile), we compiled the most finely sampled light curve available for a short burst optical/NIR afterglow. The light curve was then analysed in a standard fashion. GROND and XRT data were used to determine the broad-band spectral energy distribution of the afterglow across more than three orders of magnitude. Our data show that a light curve break exists at 0.4 days, which is followed by a steep decay. This light curve decay is achromatic in the optical/NIR bands, and interpreted as a post-jet break phase. The X-ray data do not disagree with this interpretation. The half-opening angle of the suspected jet as well as the luminosity of the optical afterglow provide additional evidence that GRB 090426 is probably linked to the death of a massive star rather than to the merger of two compact objects.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: individual: GRB 090426

Simbad objects: 5

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Number of rows : 5
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 GRB 060121 gB 09 09 51.930 +45 39 45.41           ~ 114 1
2 GRB 090426 gB 12 36 19.49 +32 59 05.5           ~ 180 0
3 GRB 050724 gB 16 24 44.400 -27 32 27.90     19.70     ~ 408 1
4 GRB 060614 gB 21 23 32.140 -53 01 36.10 18.89 20.12 19.54     ~ 540 1
5 GRB 051221 gB 21 54 48.626 +16 53 27.16 19.49         ~ 334 1

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2022.08.15-10:04:11

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