Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 15:23:24 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger357072
======================================================================

  Trigger: 00357072      Segment: 000

  BAT Trigger Time: 269063470.08   [s; MET]
      Trigger Stop: 269063474.176   [s; MET]
               UTC: 2009-07-12T03:51:05.176560    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 70.1028622577386   Dec: 22.5571323863833  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.56
     Image Trigger?:     NO
     Rate S/N Ratio:     10.6770782520313  [ if not an image trigger ]
     Image S/N Ratio:    7.56

  Analysis Position:   [ source = BAT ]
    RA: 70.1028622577386   Dec: 22.5571323863833  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 70.0934667968483   Dec: 22.5245830412419  [deg; J2000]  
        { 04h 40m 22.4s , +22d 31' 28.5" }
         +/- 1.58802876880984 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.457364687676241 [arcmin] (formal 1-sigma fit error)
    SNR: 15.7100604927019
 
  Angular difference between the analysis and refined position is 2.021174 arcmin
 
  Partial Coding Fraction: 0.6796875    [ including projection effects ]

  Duration
     T90: 202.899999976158 +/- 44.9275542881556
        Measured from: -82.255999982357
                   to: 120.643999993801     [s; relative to TRIGTIME]
     T50: 48.555999994278 +/- 13.5549117232089
        Measured from: -25.1240000128746
                   to: 23.4319999814034     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -6.09599995613098     
                   to: -5.09599995613098     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -112.895999968052     
                   to: 159.752000033855     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.473752   1.944967   1.798441   0.436072
           0.110084   0.116213   0.108060   0.106732 [error]
 Peak      0.025135   0.041332   0.033707   0.013091
           0.007095   0.007455   0.007019   0.006805 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  272.648 -112.896  159.752
T90   202.900  -82.256  120.644
T50    48.556  -25.124   23.432
Peak    1.000   -6.096   -5.096
 
 
====== 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      -1.364    -0.112      0.112       -           -               -         1.46e-03     -8.96e-05          8.95e-05      57.760   57
CPL     -1.283    -0.138      0.420      440.808    -440.808      -440.808      1.60e-03     -2.16e-04          9.04e-04      57.660   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      -1.370     -0.353     0.354       -           -               -         7.04e-03     -1.53e-03          1.52e-03      66.260   57
CPL     -0.124     -1.376     2.033       73.125     -21.214       -73.125      3.08e-02     -3.08e-02          2.82e-01      64.080   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   4.48e-07  8.94e-07  1.39e-06  4.75e-06  3.88e-06  7.48e-06   erg/cm2
      90%_error_low -5.07e-08 -6.07e-08 -1.08e-07 -7.78e-07 -2.64e-07 -8.56e-07   erg/cm2
      90%_error_hi   5.25e-08  6.02e-08  1.08e-07  8.82e-07  2.66e-07  9.42e-07   erg/cm2
Peak flux       PL   2.56e-01  2.78e-01  2.15e-01  2.73e-01  8.52e-01  1.02e+00   ph/cm2/s
      90%_error_low -8.77e-02 -6.46e-02 -5.65e-02 -1.21e-01 -1.84e-01 -2.25e-01   ph/cm2/s
      90%_error_hi   9.69e-02  6.37e-02  5.62e-02  1.69e-01  1.84e-01  2.30e-01   ph/cm2/s
 
Fluence        CPL   4.41e-07  9.01e-07  1.40e-06  4.19e-06  3.86e-06  6.93e-06   erg/cm2
      90%_error_low -6.12e-08 -6.54e-08 -1.06e-07 -1.84e-06 -2.88e-07 -1.85e-06   erg/cm2
      90%_error_hi   5.26e-08  6.84e-08  1.17e-07  7.36e-07  2.73e-07  7.11e-07   erg/cm2
Peak flux      CPL   2.07e-01  3.12e-01  2.31e-01  8.15e-02  8.10e-01  8.32e-01   ph/cm2/s
      90%_error_low -1.02e-01 -7.79e-02 -6.80e-02 -8.15e-02 -1.89e-01 -2.04e-01   ph/cm2/s
      90%_error_hi   1.12e-01  8.27e-02  6.82e-02  2.51e-01  1.90e-01  2.90e-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
   70.0935    22.5246   0.0122    35.1938   -22.0675         5.8717864     15.710 TRIG_00357072                 
 
Foreground time interval of the image:
-112.896 159.752 (delta_t = 272.648 [sec])
Background time interval of the image:
-567.179 -534.007 (delta_t =  33.172 [sec])
-239.080 -112.896 (delta_t = 126.184 [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 -112.896 sec. to  159.752 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36395     ( -0.111897   0.112236 )
Norm@50keV  : 1.46132E-03    ( -8.96317e-05   8.95111e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.76 using 59 PHA bins.
# Reduced chi-squared =          1.013 for     57 degrees of freedom 
# Null hypothesis probability =   4.469763e-01
 
Photon flux (15-150 keV)    in 272.6 sec: 0.176563 ( -0.011162  0.01119 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.87915e-06 ( -2.64256e-07  2.65955e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from -112.896 sec. to  159.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.28308     ( -0.138331   0.420293 )
Epeak [keV] : 440.808      ( -465.119 -465.119 )
Norm@50keV  : 1.59803E-03    ( -0.000217474   0.000902165 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.66 using 59 PHA bins.
# Reduced chi-squared =          1.030 for     56 degrees of freedom 
# Null hypothesis probability =   4.135908e-01
 
Photon flux (15-150 keV)    in 272.6 sec: 0.175790 ( -0.011745  0.011094 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.85563e-06 ( -2.87784e-07  2.73192e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -6.096 sec. to   -5.096 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37027     ( -0.352536   0.353699 )
Norm@50keV  : 7.03806E-03    ( -0.0015292   0.0015211 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.26 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     57 degrees of freedom 
# Null hypothesis probability =   1.878863e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.851520 ( -0.183905  0.1844 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.844e-08 ( -1.62737e-08  1.66581e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -6.096 sec. to   -5.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.124058     ( -1.3759   2.03342 )
Epeak [keV] : 73.1249      ( -21.2143 -73.1251 )
Norm@50keV  : 3.07606E-02    ( -0.0307602   0.281969 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.08 using 59 PHA bins.
# Reduced chi-squared =          1.144 for     56 degrees of freedom 
# Null hypothesis probability =   2.142656e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.810459 ( -0.188732  0.190231 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.17462e-08 ( -1.69285e-08  1.83072e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 202.9 sec.
Hardness ratio (energy fluence ratio) = 1.55410326483

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

    S(15-50 keV)  = 1.3422102e-06
S(50-150 keV) = 2.536925e-06

    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 = 6.535952434727554E-01, IMY = 2.649658515032313E-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:
-567.179400 -534.007000
-239.080000 -112.896000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6398  22.0185    0.5  38.1  -42.6   6.5175  24.4    0.4	Crab                          
 47.0779  16.2959    2.7  43.2   11.7   1.1242   4.2 ------	UNKNOWN                       
151.0239  56.2087    2.6  44.0 -140.2   1.4681   4.5 ------	UNKNOWN                       
 83.4488   5.5931    2.5  54.0  -36.7   3.6626   4.7 ------	UNKNOWN

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

    Time interval of the image:
-112.896000 159.752000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7784  22.0950    5.3  38.0  -42.8  -1.0009  -2.2    9.4	Crab                          
 35.3829  36.8471    2.5  28.2   42.4   1.7955   4.6 ------	UNKNOWN                       
 70.0935  22.5246    0.7  35.2  -22.1   5.8720  15.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
401.320630 840.230000
840.920000 962.930000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
204.4197  16.3666    3.0  39.9  104.0   5.2927   3.8 ------	UNKNOWN                       
202.3402  27.5570    2.8  32.1   89.9   2.7890   4.0 ------	UNKNOWN                       
170.4905  -8.5774    2.9  46.3  166.3   3.2588   4.0 ------	UNKNOWN                       
170.6734  72.4558    3.4  35.0   -4.9   1.3307   3.4 ------	UNKNOWN                       
164.4187  58.7021    2.8  21.2   -9.5   1.2895   4.2 ------	UNKNOWN                       
154.3779 -10.4042    2.7  49.2 -172.4   3.0908   4.3 ------	UNKNOWN                       
152.1693  87.4022    3.4  49.9   -8.2   2.2827   3.4 ------	UNKNOWN                       
143.5780 -15.4195    3.0  57.0 -161.5   6.2399   3.8 ------	UNKNOWN                       
100.9812  72.2983    2.1  46.9  -29.5   3.7649   5.6 ------	UNKNOWN                       
129.7740   1.9756    2.9  48.6 -135.7   5.4427   4.0 ------	UNKNOWN