Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 12:03:11 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger238108
======================================================================

  Trigger: 00238108      Segment: 000

  BAT Trigger Time: 184852042.88   [s; MET]
      Trigger Stop: 184852044.928   [s; MET]
               UTC: 2006-11-10T11:47:21.318140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 336.30368447156   Dec: -2.26672228601831  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.33
     Image Trigger?:     NO
     Rate S/N Ratio:     8  [ if not an image trigger ]
     Image S/N Ratio:    7.33

  Analysis Position:   [ source = BAT ]
    RA: 336.30368447156   Dec: -2.26672228601831  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 336.285915402244   Dec: -2.25967051729736  [deg; J2000]  
        { 22h 25m 08.6s , -02d 15' 34.8" }
         +/- 1.14669362771445 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.43026213724939 [arcmin] (formal 1-sigma fit error)
    SNR: 25.0145977831664
 
  Angular difference between the analysis and refined position is 1.146259 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 44.5080000162125 +/- 5.90336208604624
        Measured from: -6.2039999961853
                   to: 38.3040000200272     [s; relative to TRIGTIME]
     T50: 22.1440000236034 +/- 3.23418241155829
        Measured from: 1.04399999976158
                   to: 23.188000023365     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.11599999666214     
                   to: 3.11599999666214     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.7960000038147     
                   to: 44.8840000033379     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.656172   0.736010   0.510980   0.088161
           0.036070   0.038080   0.035543   0.036373 [error]
 Peak      0.031733   0.016642   0.009808   0.015331
           0.005055   0.005286   0.005076   0.005195 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   53.680   -8.796   44.884
T90    44.508   -6.204   38.304
T50    22.144    1.044   23.188
Peak    1.000    2.116    3.116
 
 
====== 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      -1.643    -0.118      0.116       -           -               -         2.26e-03     -1.48e-04          1.47e-04      59.030   57
CPL     -1.556    -0.196      0.448      240.328    -240.328      -240.328      2.51e-03     -6.45e-04          1.74e-03      58.900   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      -2.040     -0.599     0.517       -           -               -         3.08e-03     -1.22e-03          1.17e-03      59.970   57
CPL     -2.101     -0.487     2.431       44.496      N/A           N/A         2.65e-03        N/A               N/A         59.770   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   1.77e-07  2.98e-07  3.81e-07  9.81e-07  1.13e-06  1.84e-06   erg/cm2
      90%_error_low -1.75e-08 -1.78e-08 -3.50e-08 -1.80e-07 -7.99e-08 -2.11e-07   erg/cm2
      90%_error_hi   1.81e-08  1.78e-08  3.51e-08  2.08e-07  8.11e-08  2.34e-07   erg/cm2
Peak flux       PL   2.14e-01  1.57e-01  7.61e-02  5.25e-02  4.71e-01  4.99e-01   ph/cm2/s
      90%_error_low -6.95e-02 -4.25e-02 -3.69e-02 -3.60e-02 -1.18e-01 -1.31e-01   ph/cm2/s
      90%_error_hi   7.01e-02  4.07e-02  4.20e-02  7.14e-02  1.18e-01  1.36e-01   ph/cm2/s
 
Fluence        CPL   1.75e-07  3.00e-07  3.82e-07  8.39e-07  1.12e-06  1.70e-06   erg/cm2
      90%_error_low -2.07e-08 -1.98e-08 -3.54e-08 -4.26e-07 -9.55e-08 -4.40e-07   erg/cm2
      90%_error_hi   1.82e-08  2.17e-08  3.57e-08  1.81e-07  8.96e-08  2.08e-07   erg/cm2
Peak flux      CPL   2.02e-01  1.43e-01  7.02e-02  5.48e-02  4.40e-01  4.74e-01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A   -5.48e-02 -2.36e-01     N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A    2.74e-02  1.47e-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
  336.2859    -2.2597   0.0077     6.2687    43.7789         1.7067683     25.015 TRIG_00238108                 
 
Foreground time interval of the image:
 -8.796  30.021 (delta_t =  38.817 [sec])
Background time interval of the image:
-239.880  -8.796 (delta_t = 231.084 [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   -8.796 sec. to   44.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64326     ( -0.118208   0.116363 )
Norm@50keV  : 2.25567E-03    ( -0.000148295   0.000146779 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.03 using 59 PHA bins.
# Reduced chi-squared =          1.036 for     57 degrees of freedom 
# Null hypothesis probability =   4.012400e-01
 
Photon flux (15-150 keV)    in 53.68 sec: 0.293896 ( -0.017531  0.017551 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12708e-06 ( -7.99413e-08  8.10509e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -8.796 sec. to   44.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.55621     ( -0.195893   0.448175 )
Epeak [keV] : 240.328      ( -240.328 -240.328 )
Norm@50keV  : 2.50570E-03    ( -0.000645409   0.00173959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.90 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     56 degrees of freedom 
# Null hypothesis probability =   3.697646e-01
 
Photon flux (15-150 keV)    in 53.68 sec: 0.292250 ( -0.019149  0.018676 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11587e-06 ( -9.55096e-08  8.96472e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    2.116 sec. to    3.116 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.03985     ( -0.59858   0.516577 )
Norm@50keV  : 3.08211E-03    ( -0.00121727   0.00117054 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.97 using 59 PHA bins.
# Reduced chi-squared =          1.052 for     57 degrees of freedom 
# Null hypothesis probability =   3.686809e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.471028 ( -0.117809  0.118061 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.84971e-08 ( -9.65323e-09  1.08706e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    2.116 sec. to    3.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.10143     ( -0.48699   2.43125 )
Epeak [keV] : 44.4961      (   )
Norm@50keV  : 2.64856E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.77 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     56 degrees of freedom 
# Null hypothesis probability =   3.405615e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.439900 ( -0.235787  0.147199 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.81916e-08 ( -2.44174e-08  4.82482e-09 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 44.508 sec.
Hardness ratio (energy fluence ratio) = 1.28055997908

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

    S(15-50 keV)  = 4.747253e-07
S(50-150 keV) = 6.523412e-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 = 7.931218979124242E-02, IMY = -7.600160850657510E-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:
-239.880000 -8.796000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7924  10.9630    2.6  49.2  -41.9   3.1010   4.4    1.1	GRS 1915+105                  
299.5895  35.2113    0.9  54.4   -9.1   8.1955  13.2    0.6	Cyg X-1                       
308.1119  40.9785   39.7  54.8    1.7  -0.2217  -0.3    1.6	Cyg X-3                       
326.1511  38.1592    8.2  47.0   17.0   0.6723   1.4    9.8	Cyg X-2                       
348.4092  32.6354    3.1  43.0   43.3   2.2411   3.7 ------	UNKNOWN                       
331.5519  32.8448    2.2  41.2   22.2   1.8471   5.3 ------	UNKNOWN

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

    Time interval of the image:
-8.796000 30.020610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.9064  10.9148    4.6  49.1  -41.9   0.6534   2.5    6.6	GRS 1915+105                  
299.5875  35.2290    6.3  54.4   -9.1  -0.4077  -1.8    1.6	Cyg X-1                       
308.1993  40.8891    7.5  54.7    1.7   0.4604   1.5    5.5	Cyg X-3                       
326.1049  38.2106   87.6  47.1   17.0  -0.0230  -0.1    7.4	Cyg X-2                       
 23.2762 -25.4947    2.1  49.6  142.5   1.7504   5.4 ------	UNKNOWN                       
346.6464  38.5804    2.1  48.2   38.7   1.7002   5.6 ------	UNKNOWN                       
346.2906  19.8722    2.2  30.5   48.4   0.5496   5.4 ------	UNKNOWN                       
355.6217 -20.2886    2.1  23.8  148.5   0.4257   5.5 ------	UNKNOWN                       
336.2859  -2.2597    0.5   6.3   43.8   1.7067  25.0 ------	UNKNOWN                       
309.5150  17.1473    2.2  35.3  -18.2   0.4745   5.1 ------	UNKNOWN                       
288.3166   1.7399    2.2  47.0  -54.0   1.5226   5.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
57.620600 962.225600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5808  35.2021    0.5  50.8  -20.0  33.2653  25.7    0.5	Cyg X-1                       
308.1358  40.8499   30.1  50.2   -8.6   0.4581   0.4    6.3	Cyg X-3                       
326.2656  38.3990    6.3  41.7    7.2   1.4486   1.8    6.4	Cyg X-2                       
  9.2223  21.5859    3.2  40.1   70.8   7.3686   3.5 ------	UNKNOWN                       
  4.3493  32.6750    3.0  43.9   53.9   7.7660   3.9 ------	UNKNOWN                       
  0.1028   5.1857    3.0  24.9   91.7   2.3791   3.9  311.2	UNKNOWN                       
341.4074  41.6467    2.9  44.1   24.6   3.9731   4.0 ------	UNKNOWN                       
356.4099 -57.1507    4.2  57.2 -173.7   7.4126   2.8 ------	UNKNOWN                       
313.9136 -54.4170    5.1  55.3 -145.3   8.1456   2.3 ------	UNKNOWN