Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 20 12:05:46 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger255029
======================================================================

  Trigger: 00255029      Segment: 000

  BAT Trigger Time: 189864320   [s; MET]
      Trigger Stop: 189864416   [s; MET]
               UTC: 2007-01-07T12:05:18.316420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 159.407793776817   Dec: -53.207754632713  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.29
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    17.29

  Analysis Position:   [ source = BAT ]
    RA: 159.407793776817   Dec: -53.207754632713  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 159.425490693158   Dec: -53.2065285925257  [deg; J2000]  
        { 10h 37m 42.1s , -53d 12' 23.5" }
         +/- 1.19127676496544 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.453545268367258 [arcmin] (formal 1-sigma fit error)
    SNR: 23.6880248308494
 
  Angular difference between the analysis and refined position is 0.640187 arcmin
 
  Partial Coding Fraction: 0.5390625    [ including projection effects ]

  Duration
     T90: 370.299999982119 +/- 45.6328837409909
        Measured from: -15.5679999887943
                   to: 354.731999993324     [s; relative to TRIGTIME]
     T50: 43.0120000243187 +/- 6.02942386236866
        Measured from: -5.49200001358986
                   to: 37.5200000107288     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -7.24000000953674     
                   to: -6.24000000953674     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -20.5079999864101     
                   to: 465.324000000954     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.991942   2.584329   2.422122   1.117193
           0.125282   0.129398   0.113595   0.100410 [error]
 Peak      0.038051   0.084101   0.092730   0.038397
           0.008321   0.009158   0.008818   0.007569 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  485.832  -20.508  465.324
T90   370.300  -15.568  354.732
T50    43.012   -5.492   37.520
Peak    1.000   -7.240   -6.240
 
 
====== 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      -1.266    -0.095      0.096       -           -               -         1.11e-03     -5.45e-05          5.44e-05      60.020   57
CPL     -1.266    -0.092      0.101     9999.350    -9999.350      -9999.350      1.11e-03     -5.43e-05          1.21e-04      60.130   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      -0.960     -0.200     0.209       -           -               -         1.72e-02     -1.95e-03          1.92e-03      56.450   57
CPL     -0.952     -0.204     0.209     9999.000    -9999.000      -9999.000      1.73e-02     -1.91e-03          8.01e-03      56.480   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   5.52e-07  1.17e-06  1.95e-06  7.36e-06  5.36e-06  1.10e-05   erg/cm2
      90%_error_low -5.78e-08 -7.16e-08 -1.12e-07 -9.64e-07 -2.79e-07 -1.02e-06   erg/cm2
      90%_error_hi   6.01e-08  7.09e-08  1.11e-07  1.07e-06  2.80e-07  1.10e-06   erg/cm2
Peak flux       PL   4.23e-01  5.89e-01  6.05e-01  1.14e+00  1.98e+00  2.75e+00   ph/cm2/s
      90%_error_low -1.01e-01 -8.91e-02 -6.83e-02 -2.67e-01 -2.26e-01 -3.16e-01   ph/cm2/s
      90%_error_hi   1.11e-01  8.70e-02  6.77e-02  3.22e-01  2.27e-01  3.26e-01   ph/cm2/s
 
Fluence        CPL   5.51e-07  1.16e-06  1.91e-06  7.45e-06  5.40e-06  1.08e-05   erg/cm2
      90%_error_low -5.80e-08 -6.30e-08 -7.58e-08 -1.76e-06 -3.16e-07 -1.12e-06   erg/cm2
      90%_error_hi   6.01e-08  7.96e-08  1.47e-07  1.27e-06  2.43e-07  1.27e-06   erg/cm2
Peak flux      CPL   4.23e-01  5.89e-01  6.05e-01  1.25e+00  1.98e+00  2.76e+00   ph/cm2/s
      90%_error_low     N/A   -8.94e-02     N/A       N/A   -2.26e-01 -4.52e-01   ph/cm2/s
      90%_error_hi      N/A    8.69e-02     N/A       N/A    2.27e-01  1.63e-01   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
  159.4255   -53.2065   0.0081    37.9498   166.9295         3.8346524     23.688 TRIG_00255029                 
 
Foreground time interval of the image:
 -0.899 105.301 (delta_t = 106.200 [sec])
Background time interval of the image:




    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  -20.508 sec. to  465.324 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.26595     ( -0.0950733   0.0960558 )
Norm@50keV  : 1.10722E-03    ( -5.45422e-05   5.44275e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.02 using 59 PHA bins.
# Reduced chi-squared =          1.053 for     57 degrees of freedom 
# Null hypothesis probability =   3.669099e-01
 
Photon flux (15-150 keV)    in 485.8 sec: 0.131303 ( -0.007035  0.007059 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.36153e-06 ( -2.79264e-07  2.79876e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -20.508 sec. to  465.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.26625     ( -0.0918302   0.100809 )
Epeak [keV] : 9999.35      ( -9999.36 -9999.36 )
Norm@50keV  : 1.11224E-03    ( -5.42487e-05   0.000120722 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.13 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     56 degrees of freedom 
# Null hypothesis probability =   3.284859e-01
 
Photon flux (15-150 keV)    in 485.8 sec: 0.131275 ( -0.007038  0.007057 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.39583e-06 ( -3.15551e-07  2.43241e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -7.240 sec. to   -6.240 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.960276     ( -0.199578   0.209445 )
Norm@50keV  : 1.72165E-02    ( -0.00194641   0.00191995 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.45 using 59 PHA bins.
# Reduced chi-squared =         0.9903 for     57 degrees of freedom 
# Null hypothesis probability =   4.958423e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.97865 ( -0.2262  0.22707 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.88882e-07 ( -2.14378e-08  2.14958e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -7.240 sec. to   -6.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.951943     ( -0.203546   0.209242 )
Epeak [keV] : 9999.00      ( -9999.34 -9999.34 )
Norm@50keV  : 1.73147E-02    ( -0.00191205   0.0080037 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.48 using 59 PHA bins.
# Reduced chi-squared =          1.009 for     56 degrees of freedom 
# Null hypothesis probability =   4.568299e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.97820 ( -0.22619  0.22704 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.89575e-07 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = -7.596719377047961E-01, IMY = -1.763688984303783E-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:

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

    Time interval of the image:
-0.899400 105.300630
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4828 -40.5526    3.1  38.6  133.5   0.8870   3.7    2.1	Vela X-1                      
170.1855 -60.5710    4.5  36.3 -177.7   0.3605   2.6    4.9	Cen X-3                       
186.6180 -62.7618    1.3  39.8 -165.8   1.3558   8.8    1.2	GX 301-2                      
162.5223 -48.0957    2.6  43.2  164.5   0.8970   4.4 ------	UNKNOWN                       
159.4255 -53.2065    0.5  37.9  166.9   3.8343  23.7 ------	UNKNOWN                       
168.8208 -78.1884    2.3  25.8 -149.8   0.5560   4.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
162.900600 963.097700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5495 -40.5414    1.0  20.5   74.8   5.0660  11.3    1.2	Vela X-1                      
170.3949 -60.6199    4.7   9.5  -78.3   0.8759   2.5    2.3	Cen X-3                       
186.6684 -62.7773    0.6  17.1  -89.2   8.5037  20.4    0.5	GX 301-2                      
194.6861 -10.3727    2.8  51.3 -177.1   4.5541   4.2 ------	UNKNOWN                       
  9.2323 -69.2312    4.2  55.6  -31.5   6.6124   2.7 ------	UNKNOWN                       
304.5267 -77.9257    3.9  47.1  -53.2   6.1776   2.9 ------	UNKNOWN