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Title: GRB 060714: No Clear Dividing Line Between Prompt Emission and X-Ray Flares

Abstract

The long gamma-ray burst GRB 060714 was observed to exhibit a series of five X-ray flares beginning {approx} 70 s after the burst trigger T{sub 0} and continuing until {approx} T{sub 0} + 200 s. The first two flares were detected by the Burst Alert Telescope (BAT) on the Swift satellite, before Swift had slewed to the burst location, while the last three flares were strongly detected by the X-Ray Telescope (XRT) but only weakly detected by the BAT. This burst provides an unusual opportunity to track a complete sequence of flares over a wide energy range. The flares were very similar in their light curve morphology, showing power-law rise and fall components, and in most cases significant sub-structure. The flares also showed strong evolution with time, both spectrally and temporally. The small time scale and large amplitude variability observed are incompatible with an external shock origin for the flares, and support instead late time sporadic activity either of the central source or of localized dissipation events within the outflow. We show that the flares in GRB 060714 cannot be the result of internal shocks in which the contrast in the Lorentz factor of the colliding shells is very small,more » and that this mechanism faces serious difficulties in most Swift GRBs. The morphological similarity of the flares and the prompt emission and the gradual and continual evolution of the flares with time makes it difficult and arbitrary to draw a dividing line between the prompt emission and the flares.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
900237
Report Number(s):
SLAC-PUB-12368
astro-ph/0702603; TRN: US200709%%470
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Submitted to Astrophysical Journal
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMIC GAMMA BURSTS; ENERGY RANGE; ORIGIN; TELESCOPES; X RADIATION; Astrophysics,ASTRO

Citation Formats

Krimm, Hans A., /NASA, Goddard /Universities Space Research Assoc., Granot, J., /KIPAC, Menlo Park, Marshal, F., /NASA, Goddard, Perri, M., /ASDC, Frascati, Barthelmy, S.D., /NASA, Goddard, Burrows, D.N., /Penn State U., Astron. Astrophys., Gehrels, N., /NASA, Goddard, Meszaros, P., Morris, D., and /Penn State U., Astron. Astrophys.. GRB 060714: No Clear Dividing Line Between Prompt Emission and X-Ray Flares. United States: N. p., 2007. Web. doi:10.1086/519019.
Krimm, Hans A., /NASA, Goddard /Universities Space Research Assoc., Granot, J., /KIPAC, Menlo Park, Marshal, F., /NASA, Goddard, Perri, M., /ASDC, Frascati, Barthelmy, S.D., /NASA, Goddard, Burrows, D.N., /Penn State U., Astron. Astrophys., Gehrels, N., /NASA, Goddard, Meszaros, P., Morris, D., & /Penn State U., Astron. Astrophys.. GRB 060714: No Clear Dividing Line Between Prompt Emission and X-Ray Flares. United States. doi:10.1086/519019.
Krimm, Hans A., /NASA, Goddard /Universities Space Research Assoc., Granot, J., /KIPAC, Menlo Park, Marshal, F., /NASA, Goddard, Perri, M., /ASDC, Frascati, Barthelmy, S.D., /NASA, Goddard, Burrows, D.N., /Penn State U., Astron. Astrophys., Gehrels, N., /NASA, Goddard, Meszaros, P., Morris, D., and /Penn State U., Astron. Astrophys.. Mon . "GRB 060714: No Clear Dividing Line Between Prompt Emission and X-Ray Flares". United States. doi:10.1086/519019. https://www.osti.gov/servlets/purl/900237.
@article{osti_900237,
title = {GRB 060714: No Clear Dividing Line Between Prompt Emission and X-Ray Flares},
author = {Krimm, Hans A. and /NASA, Goddard /Universities Space Research Assoc. and Granot, J. and /KIPAC, Menlo Park and Marshal, F. and /NASA, Goddard and Perri, M. and /ASDC, Frascati and Barthelmy, S.D. and /NASA, Goddard and Burrows, D.N. and /Penn State U., Astron. Astrophys. and Gehrels, N. and /NASA, Goddard and Meszaros, P. and Morris, D. and /Penn State U., Astron. Astrophys.},
abstractNote = {The long gamma-ray burst GRB 060714 was observed to exhibit a series of five X-ray flares beginning {approx} 70 s after the burst trigger T{sub 0} and continuing until {approx} T{sub 0} + 200 s. The first two flares were detected by the Burst Alert Telescope (BAT) on the Swift satellite, before Swift had slewed to the burst location, while the last three flares were strongly detected by the X-Ray Telescope (XRT) but only weakly detected by the BAT. This burst provides an unusual opportunity to track a complete sequence of flares over a wide energy range. The flares were very similar in their light curve morphology, showing power-law rise and fall components, and in most cases significant sub-structure. The flares also showed strong evolution with time, both spectrally and temporally. The small time scale and large amplitude variability observed are incompatible with an external shock origin for the flares, and support instead late time sporadic activity either of the central source or of localized dissipation events within the outflow. We show that the flares in GRB 060714 cannot be the result of internal shocks in which the contrast in the Lorentz factor of the colliding shells is very small, and that this mechanism faces serious difficulties in most Swift GRBs. The morphological similarity of the flares and the prompt emission and the gradual and continual evolution of the flares with time makes it difficult and arbitrary to draw a dividing line between the prompt emission and the flares.},
doi = {10.1086/519019},
journal = {Submitted to Astrophysical Journal},
number = ,
volume = ,
place = {United States},
year = {Mon Feb 26 00:00:00 EST 2007},
month = {Mon Feb 26 00:00:00 EST 2007}
}