GRB100526B: Summary Image Light curves Spectra Distribution Others

Analysis Summary

Notes:

• 1) No attempt has been made to eliminate the non-significant decimal places.
• 2) This batgrbproduct analysis is done using the HEASARC data.
• 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 18:15:05 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger423184
======================================================================

  Trigger: 00423184      Segment: 000

  BAT Trigger Time: 296593244.352   [s; MET]
      Trigger Stop: 296593271.232   [s; MET]
               UTC: 2010-05-26T19:00:38.517680    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 0.699890609018591   Dec: -37.9023721389102  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.89
     Image Trigger?:     NO
     Rate S/N Ratio:     6.92820323027551  [ if not an image trigger ]
     Image S/N Ratio:    6.89

  Analysis Position:   [ source = BAT ]
    RA: 0.699890609018591   Dec: -37.9023721389102  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 0.728184823810135   Dec: -37.9243943086205  [deg; J2000]  
        { 00h 02m 54.8s , -37d 55' 27.8" }
         +/- 2.14847245811105 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.871128547931319 [arcmin] (formal 1-sigma fit error)
    SNR: 10.201105766198
 
  Angular difference between the analysis and refined position is 1.881426 arcmin
 
  Partial Coding Fraction: 0.953125    [ including projection effects ]

  Duration
     T90: 67 +/- 15.2643375224737
        Measured from: -22.3519999980927
                   to: 44.6480000019073     [s; relative to TRIGTIME]
     T50: 29 +/- 11.3137084989848
        Measured from: -7.35199999809265
                   to: 21.6480000019073     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.64800000190735     
                   to: 3.64800000190735     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -26.3519999980927     
                   to: 47.6480000019073     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.262219   0.351036   0.230734   0.111955
           0.044564   0.045869   0.041291   0.037994 [error]
 Peak      0.006435   0.012745   0.018075   0.004518
           0.005114   0.005403   0.004997   0.004604 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   74.000  -26.352   47.648
T90    67.000  -22.352   44.648
T50    29.000   -7.352   21.648
Peak    1.000    2.648    3.648
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.478    -0.267      0.263       -           -               -         7.56e-04     -1.20e-04          1.18e-04      58.160   57
CPL     -1.303     N/A        N/A         181.786      N/A           N/A         9.43e-04        N/A               N/A         58.070   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -0.695     -0.751     0.911       -           -               -         2.52e-03     -1.15e-03          1.03e-03      46.800   57
CPL     -0.424      0.424    10.411      379.062    -379.062      -379.062      3.20e-03     -1.71e-03          1.05e+01      46.820   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   7.00e-08  1.30e-07  1.87e-07  5.69e-07  5.33e-07  9.57e-07   erg/cm2
      90%_error_low -1.63e-08 -1.96e-08 -3.95e-08 -2.17e-07 -9.37e-08 -2.56e-07   erg/cm2
      90%_error_hi   1.71e-08  1.95e-08  3.95e-08  2.96e-07  9.61e-08  3.23e-07   erg/cm2
Peak flux       PL   4.83e-02  7.88e-02  9.74e-02  2.38e-01  2.92e-01  4.63e-01   ph/cm2/s
      90%_error_low -3.62e-02 -7.88e-02 -3.85e-02 -1.60e-01 -1.14e-01 -1.94e-01   ph/cm2/s
      90%_error_hi   5.60e-02  4.44e-02  3.74e-02  3.36e-01  1.16e-01  2.85e-01   ph/cm2/s
 
Fluence        CPL   6.87e-08  1.33e-07  1.88e-07  4.11e-07  5.22e-07  8.01e-07   erg/cm2
      90%_error_low -1.83e-08 -2.21e-08 -4.11e-08 -3.36e-07 -1.13e-07 -3.62e-07   erg/cm2
      90%_error_hi   1.61e-08  2.65e-08  4.12e-08  2.12e-07  1.05e-07  2.41e-07   erg/cm2
Peak flux      CPL   4.87e-02  7.93e-02  9.74e-02  2.40e-01  2.92e-01  4.63e-01   ph/cm2/s
      90%_error_low     N/A       N/A   -3.84e-02 -2.40e-01 -1.44e-01 -4.63e-01   ph/cm2/s
      90%_error_hi      N/A       N/A    6.42e-02  3.26e-01  1.15e-01  2.78e-01   ph/cm2/s
 
======================================================================

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    0.7282   -37.9244   0.0189    10.3333   123.4695         1.0024224     10.201 TRIG_00423184                 
 
Foreground time interval of the image:
-26.352  47.648 (delta_t =  74.000 [sec])
Background time interval of the image:
-502.352 -382.288 (delta_t = 120.064 [sec])
-239.352 -26.352 (delta_t = 213.000 [sec])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

Spectra

Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from  -26.352 sec. to   47.648 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47839     ( -0.267109   0.262726 )
Norm@50keV  : 7.56398E-04    ( -0.000120059   0.000118062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.16 using 59 PHA bins.
# Reduced chi-squared =          1.020 for     57 degrees of freedom 
# Null hypothesis probability =   4.322053e-01
 
Photon flux (15-150 keV)    in 74 sec: 9.38922E-02 ( -0.0138288  0.0138328 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.32993e-07 ( -9.36929e-08  9.61245e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -26.352 sec. to   47.648 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30305     (       )
Epeak [keV] : 181.786      (   )
Norm@50keV  : 9.42973E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.07 using 59 PHA bins.
# Reduced chi-squared =          1.037 for     56 degrees of freedom 
# Null hypothesis probability =   3.988145e-01
 
Photon flux (15-150 keV)    in 74 sec: 9.31837E-02 ( -0.0144272  0.0071883 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.22086e-07 ( -1.12804e-07  1.04589e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    2.648 sec. to    3.648 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.694609     ( -0.751056   0.911412 )
Norm@50keV  : 2.52370E-03    ( -0.00114544   0.00103294 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.80 using 59 PHA bins.
# Reduced chi-squared =         0.8210 for     57 degrees of freedom 
# Null hypothesis probability =   8.304583e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.291839 ( -0.114466  0.116347 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.0883e-08 ( -1.24774e-08  1.27093e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.648 sec. to    3.648 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.68612     ( 0.44179   10.4284 )
Epeak [keV] : 9997.86      ( -9997.96 -9997.96 )
Norm@50keV  : 2.54290E-03    ( -0.00105818   10.4617 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.80 using 59 PHA bins.
# Reduced chi-squared =         0.8357 for     56 degrees of freedom 
# Null hypothesis probability =   8.046751e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.292206 ( -0.14357  0.114931 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.08994e-08 ( -1.05959e-08  1.15538e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 67.0 sec.
Hardness ratio (energy fluence ratio) = 1.43558829326

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 2.0044959e-07
S(50-150 keV) = 3.32541e-07

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

IMX = -1.005538939088317E-01, IMY = -1.520964210415964E-01

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-502.352000 -382.288300
-239.352000 -26.352000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
334.6260 -64.0169    2.7  35.1   67.5   2.0803   4.2 ------	UNKNOWN                       
353.5620 -48.7015    2.9  18.3   85.3   1.0272   4.0 ------	UNKNOWN                       
340.9674   6.9398    3.0  54.1  177.0   3.3571   3.8 ------	UNKNOWN                       
 92.1694 -47.2967    3.7  56.1  -14.5   2.7084   3.2 ------	UNKNOWN                       

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-26.352000 47.648000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
332.9348 -73.6793    2.1  41.0   54.9   1.6699   5.6 ------	UNKNOWN                       
  0.7282 -37.9244    1.1  10.3  123.5   1.0023  10.2 ------	UNKNOWN                       
  8.6081 -43.3610    2.4   6.9   72.0   0.4364   4.8 ------	UNKNOWN                       
 65.8278 -28.6744    2.3  43.9  -47.3   1.1334   5.0 ------	UNKNOWN                       
 68.4253 -24.4890    3.0  47.9  -50.9   1.5914   3.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
365.148610 962.774500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6387  22.0189    0.3  28.7  -99.5  22.9499  38.0    0.4	Crab                          
120.4632 -25.1829    3.0  47.1  156.5   4.7194   3.9 ------	UNKNOWN                       
101.8817 -31.0663    3.9  54.1  177.3   5.0517   3.0 ------	UNKNOWN                       
 80.2306  33.8549    3.2  32.6  -76.6   2.6892   3.6 ------	UNKNOWN                       
 72.8997 -13.6641    2.6  54.0 -143.2  10.7516   4.4 ------	UNKNOWN                       
 70.5453  15.1678    3.2  42.1 -107.2   6.5753   3.6 ------	UNKNOWN