TORTORA discovery of Naked-Eye Burst fast optical variability
Features characterizing gamma-ray bursts in the different spectral bands may be a clue for the nature of theirinner engine．Up to now,only several bursts have been observed in optical band during the gamma activity,and the only one-GRB080319B-was covered from rise till fall with high temporal resolution．Here we discuss these data, acquired withTORTORA fast wide-field monitoring optical camera,as well as results of its analysis． The camera observed the position of Naked-Eye Burst,GRB080318B,before,during and after the trigger．It detected thefast rise of optical emission,which reached the peak of V 5.3 at the eighteenth second,had a complex evolution till T+43sand monotonously faded then．The brightest part of the light curve contains two 15-20s segments with different fluxes,eachhaying two clearly-seen peaks of 5-8 s duration；all four peaks look quasi-periodic with separation of 9 S．There is no clearevidence of any sub-second variability．However,there are signs of quasi-periodic variability on ls time scale at around thelast peak (T+40 till T+50)． The general properties of the optical light curve and its variability time scales look similar to the gamma one,but there isno clear correlation between them．This raises serious problems in interpretation of mechanisms generating such variability．
Optical transients monitoring high time resolution wide field photometry
Grigory Beskin Sergey Karpov Sergey Bondar Giuseppe Greco AdrianoGuarnieri Corrado Bartolini Adalberto Piccioni Emilio Molinari Guido Chincarini
special Astrophysical Observatory,Nizhnij Arkhyz,Russia,369167 Institute for Precise Instrumentation,Nizhnij Arkhyz,Russia,369167 Astronomy Department of Bologna University,Bologna,Italy Osservatorio Astronomico di Brera,Milan,Italy
国际会议
2008 NanJing Gamma-Ray Burst Conference(2008年伽马暴国际研讨会)
南京
英文
251-254
2008-06-23（万方平台首次上网日期，不代表论文的发表时间）