2011A&A...526A..92U


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.09CET16:39:34

2011A&A...526A..92U - Astronomy and Astrophysics, volume 526A, 92-92 (2011/2-1)

Optical behavior of GRB 061121 around its X-ray shallow decay phase.

UEHARA T., UEMURA M., ARAI A., YAMAZAKI R., KAWABATA K.S., OHNO M., FUKAZAWA Y., OHSUGI T., YOSHIDA M., SATO S. and KINO M.

Abstract (from CDS):

We report on a detailed study of the optical afterglow of GRB 061121 with our original time-series photometric data. Along with our optical observations and public X-ray data, we discuss the origin of its optical and X-ray afterglows. We observed the optical afterglow of Swift burst GRB 061121 with the Kanata 1.5-m telescope at Higashi-Hiroshima Observatory. Our observation covers a period just after an X-ray plateau phase. We also performed deep imaging with the Subaru telescope in 2010 in order to estimate the contamination by the host galaxy. In the light curve, we find that the optical afterglow also exhibited a break as in the X-ray afterglow. However, our observation suggests a possible hump structure or a flattening period before the optical break in the light curve. There is no sign of such a hump in the X-ray light curve. This implies that the optical emitting region was distinct from the X-ray one. The hump in the optical light curve was possibly caused by a passage with the typical frequency of synchrotron emission from another forward shock distinct from the early afterglow. The observed decay and spectral indices are inconsistent with the standard synchrotron-shock model. As a results, the observation requires a change in microphysical parameters in the shock region or prior activity by the central engine. Alternatively, the emission during the shallow decay phase may be a composition of two forward shock emissions, as indicated by the hump structure in the light curve.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general

Simbad objects: 12

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Number of rows : 12

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 021004 gB 00 26 54.68 +18 55 41.6           ~ 508 1
2 GRB 080710 gB 00 33 05.68 +19 30 05.8           ~ 101 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9133 1
4 GRB 061007 gB 03 05 19.510 -50 30 02.50 14.28 14.40 12.95     ~ 263 1
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14379 1
6 GRB 061121 gB 09 48 54.570 -13 11 42.68 17.19 17.71 17.02     ~ 279 0
7 USNO-B1.0 0768-00239968 * 09 48 54.7569355860 -13 11 17.897223588   19.7   18.0   ~ 1 0
8 USNO-B1.0 0767-00229365 * 09 49 05.0739887603 -13 13 22.310249916   15.9   14.8   ~ 1 0
9 GRB 060526 gB 15 31 18.360 +00 17 04.90   18.31 17.16     ~ 229 0
10 GRB 050525A gB 18 32 32.560 +26 20 22.34 14.19 15.17 13.91     SN.Ic: 342 1
11 GRB 060117 gB 21 51 36.130 -59 58 39.10           ~ 54 0
12 GRB 051109A gB 22 01 15.320 +40 49 23.70   20.09 20.14     ~ 143 0

    Equat.    Gal    SGal    Ecl

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2019.12.09-16:39:34

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