Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 06:49:36 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger293587
======================================================================

  Trigger: 00293587      Segment: 000

  BAT Trigger Time: 213573359.04   [s; MET]
      Trigger Stop: 213573363.136   [s; MET]
               UTC: 2007-10-08T21:55:56.761900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 151.547964114205   Dec: 44.3338686638463  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.42
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6619037896906  [ if not an image trigger ]
     Image S/N Ratio:    9.42

  Analysis Position:   [ source = BAT ]
    RA: 151.547964114205   Dec: 44.3338686638463  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 151.565618302677   Dec: 44.3054742583822  [deg; J2000]  
        { 10h 06m 15.7s , +44d 18' 19.7" }
         +/- 1.94059627467662 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.789071746762406 [arcmin] (formal 1-sigma fit error)
    SNR: 11.7972936444498
 
  Angular difference between the analysis and refined position is 1.864618 arcmin
 
  Partial Coding Fraction: 0.8828125    [ including projection effects ]

  Duration
     T90: 17.9839999973774 +/- 5.13886522246629
        Measured from: -8.0639999806881
                   to: 9.9200000166893     [s; relative to TRIGTIME]
     T50: 5.31200003623962 +/- 2.7882266629656
        Measured from: -1.85600000619888
                   to: 3.45600003004074     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.172000020742416     
                   to: 1.17200002074242     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.0079999864101     
                   to: 13.5680000185966     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.218529   0.199022   0.100754   0.000574
           0.023034   0.023708   0.020299   0.017339 [error]
 Peak      0.028041   0.023773   0.007286   0.003878
           0.004749   0.004888   0.004208   0.003584 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   24.576  -11.008   13.568
T90    17.984   -8.064    9.920
T50     5.312   -1.856    3.456
Peak    1.000    0.172    1.172
 
 
====== 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      -2.144    -0.262      0.240       -           -               -         1.09e-03     -2.03e-04          1.98e-04      45.810   57
CPL     -1.108    -1.048      1.405       32.684      N/A           N/A         4.70e-03        N/A               N/A         42.950   56
 
 
=== 1-s peak 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      -2.285     -0.522     0.430       -           -               -         2.82e-03     -1.03e-03          1.01e-03      59.900   57
CPL     -1.473     -0.617     3.454       22.934      N/A           N/A         9.40e-03        N/A               N/A         59.400   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   6.28e-08  7.81e-08  7.07e-08  1.11e-07  2.50e-07  3.23e-07   erg/cm2
      90%_error_low -1.02e-08 -1.06e-08 -1.73e-08 -4.48e-08 -4.03e-08 -6.92e-08   erg/cm2
      90%_error_hi   1.04e-08  1.05e-08  1.82e-08  6.16e-08  4.18e-08  8.24e-08   erg/cm2
Peak flux       PL   2.48e-01  1.58e-01  6.47e-02  3.60e-02  4.89e-01  5.07e-01   ph/cm2/s
      90%_error_low -6.70e-02 -3.98e-02 -2.90e-02 -2.30e-02 -1.10e-01 -1.17e-01   ph/cm2/s
      90%_error_hi   6.85e-02  3.83e-02  3.23e-02  3.99e-02  1.10e-01  1.18e-01   ph/cm2/s
 
Fluence        CPL   5.96e-08  8.81e-08  6.24e-08  1.99e-08  2.25e-07  2.30e-07   erg/cm2
      90%_error_low -1.13e-08 -1.46e-08 -2.37e-08 -1.71e-08 -4.08e-08 -4.53e-08   erg/cm2
      90%_error_hi   1.12e-08  1.51e-08  2.20e-08  8.95e-08  4.68e-08  6.20e-08   erg/cm2
Peak flux      CPL   2.42e-01  1.73e-01  5.74e-02  9.81e-03  4.80e-01  4.82e-01   ph/cm2/s
      90%_error_low -7.27e-02     N/A   -5.74e-02     N/A   -1.10e-01     N/A     ph/cm2/s
      90%_error_hi   7.06e-02     N/A    3.76e-02     N/A    1.11e-01     N/A     ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

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

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  151.5656    44.3055   0.0163    12.4975    82.7443         0.5594325     11.797 TRIG_00293587                 
 
Foreground time interval of the image:
-11.008  13.568 (delta_t =  24.576 [sec])
Background time interval of the image:
-139.939 -11.008 (delta_t = 128.931 [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

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from  -11.008 sec. to   13.568 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.14419     ( -0.262174   0.240176 )
Norm@50keV  : 1.08842E-03    ( -0.000202509   0.00019819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.81 using 59 PHA bins.
# Reduced chi-squared =         0.8037 for     57 degrees of freedom 
# Null hypothesis probability =   8.558285e-01
 
Photon flux (15-150 keV)    in 24.58 sec: 0.175084 ( -0.022365  0.022369 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.49789e-07 ( -4.02903e-08  4.18003e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -11.008 sec. to   13.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10799     ( -1.04826   1.40462 )
Epeak [keV] : 32.6837      (   )
Norm@50keV  : 4.70369E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.95 using 59 PHA bins.
# Reduced chi-squared =         0.7669 for     56 degrees of freedom 
# Null hypothesis probability =   8.998061e-01
 
Photon flux (15-150 keV)    in 24.58 sec: 0.170107 ( -0.022564  0.022728 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.25109e-07 ( -4.08057e-08  4.67681e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.172 sec. to    1.172 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.28526     ( -0.522424   0.429843 )
Norm@50keV  : 2.82075E-03    ( -0.0010337   0.00101088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.90 using 59 PHA bins.
# Reduced chi-squared =          1.051 for     57 degrees of freedom 
# Null hypothesis probability =   3.708619e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.488993 ( -0.109673  0.109843 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.68893e-08 ( -7.81713e-09  8.44366e-09 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.172 sec. to    1.172 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47286     ( -0.617039   3.45379 )
Epeak [keV] : 22.9340      (   )
Norm@50keV  : 9.39652E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.40 using 59 PHA bins.
# Reduced chi-squared =          1.061 for     56 degrees of freedom 
# Null hypothesis probability =   3.528500e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.480227 ( -0.110134  0.111386 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 17.984 sec.
Hardness ratio (energy fluence ratio) = 0.904940647028

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

    S(15-50 keV)  = 1.409058e-07
S(50-150 keV) = 1.0888761e-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 = 2.799371261699209E-02, IMY = -2.198732670486664E-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:
-139.939410 -11.008000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
157.2082   7.4205    2.6  31.7  -24.9   0.4939   4.3 ------	UNKNOWN

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

    Time interval of the image:
-11.008000 13.568000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
151.5656  44.3055    1.0  12.5   82.7   0.5594  11.8 ------	UNKNOWN                       
220.1438  64.8128    2.4  41.0  170.0   0.3237   4.7 ------	UNKNOWN                       
168.2517  35.9640    2.0   2.8  -82.8   0.2238   5.7 ------	UNKNOWN                       
141.5145  -1.8676    2.1  45.9   -6.5   0.4390   5.5 ------	UNKNOWN                       
219.2586  34.4384    2.1  42.5 -143.8   0.4323   5.6 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
-239.040000 962.958500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
115.3740  52.9875    2.9  37.5   88.5   5.7207   4.0 ------	UNKNOWN                       
142.0152  33.4683    2.6  19.9   42.2   2.0043   4.5 ------	UNKNOWN                       
132.2746   8.5812    3.0  42.3   12.9   2.7549   3.8 ------	UNKNOWN                       
251.8629  56.5514    3.7  56.9  179.3  10.1727   3.2 ------	UNKNOWN                       
148.4384 -13.4571    2.3  54.1  -20.5   7.0737   5.1 ------	UNKNOWN                       
199.7844  10.2891    5.5  41.1  -98.1   7.8123   2.1 ------	UNKNOWN