Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Thu Sep 11 13:40:03 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger295527
======================================================================

  Trigger: 00295527      Segment: 000

  BAT Trigger Time: 215286064   [s; MET]
      Trigger Stop: 215286128   [s; MET]
               UTC: 2007-10-28T17:41:01.676940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 119.846989722008   Dec: 21.4977976788415  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.74
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.74

  Analysis Position:   [ source = BAT ]
    RA: 119.846989722008   Dec: 21.4977976788415  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 119.826257143885   Dec: 21.4700100994003  [deg; J2000]  
        { 07h 59m 18.3s , +21d 28' 12.0" }
         +/- 2.12272880669816 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.826427987752839 [arcmin] (formal 1-sigma fit error)
    SNR: 10.3782999346458
 
  Angular difference between the analysis and refined position is 2.029681 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 26.8560000061989 +/- 5.42508909639097
        Measured from: 20.16400000453
                   to: 47.0200000107288     [s; relative to TRIGTIME]
     T50: 15.2919999957085 +/- 5.75422487826452
        Measured from: 26.5160000026226
                   to: 41.8079999983311     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 41.7520000040531     
                   to: 42.7520000040531     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 19.2400000095367     
                   to: 48.8840000033379     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.191844   0.233980   0.108260   0.005315
           0.025693   0.026927   0.024069   0.022249 [error]
 Peak      0.019752   0.013557   0.004231   0.005377
           0.004640   0.004814   0.004343   0.004063 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   29.644   19.240   48.884
T90    26.856   20.164   47.020
T50    15.292   26.516   41.808
Peak    1.000   41.752   42.752
 
 
====== 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      -1.789    -0.254      0.240       -           -               -         1.10e-03     -1.86e-04          1.81e-04      47.640   57
CPL     -0.736    -1.121      1.570       49.029     -12.302       -49.029      4.55e-03     -4.55e-03          3.44e-02      45.150   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      -2.261     -1.040     0.742       -           -               -         1.68e-03     -1.05e-03          1.04e-03      61.350   57
CPL     -1.985     -0.021     2.575        2.140      N/A           N/A         2.46e-03        N/A               N/A         61.440   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   5.46e-08  8.42e-08  9.74e-08  2.17e-07  3.00e-07  4.53e-07   erg/cm2
      90%_error_low -1.04e-08 -1.16e-08 -2.18e-08 -8.29e-08 -5.09e-08 -1.09e-07   erg/cm2
      90%_error_hi   1.06e-08  1.16e-08  2.24e-08  1.12e-07  5.25e-08  1.33e-07   erg/cm2
Peak flux       PL   1.45e-01  9.33e-02  3.89e-02  2.21e-02  2.88e-01  2.99e-01   ph/cm2/s
      90%_error_low -6.34e-02 -4.19e-02 -2.79e-02 -2.21e-02 -1.07e-01 -1.14e-01   ph/cm2/s
      90%_error_hi   6.43e-02  3.78e-02  3.54e-02  5.40e-02  1.07e-01  1.19e-01   ph/cm2/s
 
Fluence        CPL   5.05e-08  9.55e-08  9.09e-08  4.13e-08  2.66e-07  2.78e-07   erg/cm2
      90%_error_low -1.20e-08 -1.67e-08 -2.96e-08    N/A    -5.44e-08 -6.57e-08   erg/cm2
      90%_error_hi   1.18e-08  1.77e-08  2.66e-08    N/A     6.28e-08  2.09e-07   erg/cm2
Peak flux      CPL   1.42e-01  8.50e-02  3.38e-02  2.13e-02  2.71e-01  2.94e-01   ph/cm2/s
      90%_error_low -7.28e-02 -8.50e-02 -3.38e-02     N/A       N/A       N/A     ph/cm2/s
      90%_error_hi   6.62e-02  5.79e-02  3.28e-02     N/A       N/A       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
  119.8263    21.4700   0.0185    11.4015    -4.0243         0.5115543     10.378 TRIG_00295527                 
 
Foreground time interval of the image:
 19.240  48.884 (delta_t =  29.644 [sec])
Background time interval of the image:
-239.000  19.240 (delta_t = 258.240 [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   19.240 sec. to   48.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.78946     ( -0.253905   0.239844 )
Norm@50keV  : 1.09940E-03    ( -0.000185687   0.000181161 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.64 using 59 PHA bins.
# Reduced chi-squared =         0.8359 for     57 degrees of freedom 
# Null hypothesis probability =   8.067659e-01
 
Photon flux (15-150 keV)    in 29.64 sec: 0.150888 ( -0.020647  0.020647 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.00155e-07 ( -5.08519e-08  5.25064e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   19.240 sec. to   48.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.73572     ( -1.12083   1.56976 )
Epeak [keV] : 49.0291      ( -12.3014 -49.0288 )
Norm@50keV  : 4.54881E-03    ( -0.00454899   0.0343787 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.15 using 59 PHA bins.
# Reduced chi-squared =         0.8062 for     56 degrees of freedom 
# Null hypothesis probability =   8.500175e-01
 
Photon flux (15-150 keV)    in 29.64 sec: 0.145235 ( -0.02137  0.021479 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.65937e-07 ( -5.44084e-08  6.27624e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   41.752 sec. to   42.752 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.26065     ( -1.0399   0.741752 )
Norm@50keV  : 1.68410E-03    ( -0.00105366   0.00104396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.35 using 59 PHA bins.
# Reduced chi-squared =          1.076 for     57 degrees of freedom 
# Null hypothesis probability =   3.227601e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.288036 ( -0.106652  0.107219 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.5986e-08 ( -7.73227e-09  9.16064e-09 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   41.752 sec. to   42.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.31892     ( -0.0212082   2.57545 )
Epeak [keV] : 188.300      (   )
Norm@50keV  : 1.54454E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.34 using 59 PHA bins.
# Reduced chi-squared =          1.095 for     56 degrees of freedom 
# Null hypothesis probability =   2.904514e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.270916 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.55654e-08 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 26.856 sec.
Hardness ratio (energy fluence ratio) = 1.15715057683

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

    S(15-50 keV)  = 1.3881773e-07
S(50-150 keV) = 1.6134155e-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 = 2.011658195984532E-01, IMY = 1.415253510473943E-02

    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:
-239.000000 19.240000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6301  22.0265    0.4  33.6   77.2  10.7364  26.4    0.7	Crab                          
 81.5688  12.8516    2.5  40.1   65.9   3.3711   4.6 ------	UNKNOWN                       
 70.1038  49.8266    2.8  40.0  126.9   2.3308   4.1 ------	UNKNOWN                       
 65.0647  66.3380    2.7  46.2  149.8   2.2964   4.3 ------	UNKNOWN                       
160.7959  15.0240    4.1  41.3  -77.7   2.4088   2.8 ------	UNKNOWN

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

    Time interval of the image:
19.240000 48.884000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7536  22.1660    0.0  33.4   77.3  -0.1459  -1.2   11.3	Crab                          
119.8263  21.4700    1.1  11.4   -4.0   0.5115  10.4 ------	UNKNOWN                       
186.8089  77.5720    2.0  53.1 -168.9   0.8462   5.8 ------	UNKNOWN                       
150.8875  33.1480    2.6  26.1 -102.5   0.3158   4.5 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
106.900600 758.600590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6328  22.0129    0.4  33.6   86.7  22.9678  27.3    0.1	Crab                          
 90.3696  63.9695    3.2  46.8  151.7   4.2878   3.6 ------	UNKNOWN                       
172.4131  71.9216    3.5  58.4 -174.3   6.9140   3.4 ------	UNKNOWN                       
172.9109  71.6556    3.3  58.4 -173.9   8.8754   4.2 ------	UNKNOWN                       
181.2965  47.7526    6.8  55.2 -145.1   4.8551   1.7 ------	UNKNOWN