2014A&A...572A..55M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:46:08

2014A&A...572A..55M - Astronomy and Astrophysics, volume 572A, 55-55 (2014/12-1)

The nature of the late achromatic bump in GRB 120326A.

MELANDRI A., VIRGILI F.J., GUIDORZI C., BERNARDINI M.G., KOBAYASHI S., MUNDELL C.G., GOMBOC A., DINTINJANA B., HENTUNEN V.-P., JAPELJ J., KOPAC D., KURODA D., MORGAN A.N., STEELE I.A., QUADRI U., ARICI G., ARNOLD D., GIRELLI R., HANAYAMA H., KAWAI N., MIKUZ H., NISSINEN M., SALMI T., SMITH R.J., STRABLA L., TONINCELLI M. and QUADRI A.

Abstract (from CDS):

The long Swift gamma-ray burst GRB 120326A at redshift z=1.798 exhibited a multi-band light-curve with a striking feature: a late-time, long-lasting achromatic rebrightening that is rarely seen in such events. Peaking in optical and X-ray bands ∼35ks (∼12.5ks in the GRB rest frame) after the 70 s GRB prompt burst, the feature brightened nearly two orders of magnitude above the underlying optical power-law decay. By modelling the multi-wavelength light-curves, we investigated possible causes of the rebrightening in the context of the standard fireball model. We excluded a range of scenarios for the origin of this feature: reverse-shock flash, late-time forward-shock peak caused by the passage of the brightest synchrotron frequency through the optical band, late central engine optical or X-ray flares, interaction between the expanding blast wave and a density enhancement in the circumburst medium, and gravitational microlensing. Instead we conclude that the achromatic rebrightening may be caused by a refreshed forward shock or a geometrical effect. In addition, we identify an additional component after the end of the prompt emission, which shapes the observed X-ray and optical light-curves differently, and which rules out a single overall emission component to explain the observed early-time emission.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general - gamma-ray burst: individual: GRB 120326A

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 100901A gB 01 49 03.56 +22 45 30.6           ~ 125 0
2 GRB 061007 gB 03 05 19.510 -50 30 02.50 14.28 14.40 12.95     ~ 269 1
3 GRB 091029 gB 04 00 40.00 -55 57 12.7           ~ 117 0
4 GRB 080129 gB 07 01 08.13 -07 50 47.8           ~ 67 0
5 GRB 081028 gB 08 07 34.40 +02 18 16.8           ~ 91 0
6 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1117 2
7 GRB 090313 gB 13 13 36.00 +08 05 10.7           ~ 116 0
8 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 322 1
9 GRB 000301C gB 16 20 18.5 +29 26 35           ~ 340 2
10 GRB 050724 gB 16 24 44.400 -27 32 27.90     19.70     ~ 383 1
11 GRB 120326A gB 18 15 37.06 +69 15 35.4           ~ 119 0
12 GRB 071010A gB 19 12 14.42 -32 24 06.2           ~ 105 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:46:08

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