Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 15:28:07 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger356912
======================================================================

  Trigger: 00356912      Segment: 000

  BAT Trigger Time: 268844867.776   [s; MET]
      Trigger Stop: 268844868.8   [s; MET]
               UTC: 2009-07-09T15:07:42.879640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 93.5932107495315   Dec: 64.0853192755238  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.47
     Image Trigger?:     NO
     Rate S/N Ratio:     15.7480157480236  [ if not an image trigger ]
     Image S/N Ratio:    7.47

  Analysis Position:   [ source = BAT ]
    RA: 93.5932107495315   Dec: 64.0853192755238  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 93.5056309703031   Dec: 64.0738514737333  [deg; J2000]  
        { 06h 14m 01.4s , +64d 04' 25.9" }
         +/- 1.63618801406248 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.56551943198512 [arcmin] (formal 1-sigma fit error)
    SNR: 15.0536692630554
 
  Angular difference between the analysis and refined position is 2.397827 arcmin
 
  Partial Coding Fraction: 0.1582031    [ including projection effects ]

  Duration
     T90: 26.944000005722 +/- 4.51319844312174
        Measured from: -2.94400000572205
                   to: 24     [s; relative to TRIGTIME]
     T50: 9.16800004243851 +/- 5.20364178929304
        Measured from: 0.687999963760376
                   to: 9.85600000619888     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.979999959468842     
                   to: 1.97999995946884     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -5.40800005197525     
                   to: 27.7599999904633     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.551719   0.791312   0.757393   0.149682
           0.073741   0.078105   0.070879   0.060567 [error]
 Peak      0.045350   0.117134   0.093235   0.037331
           0.014081   0.016354   0.014492   0.011401 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   33.168   -5.408   27.760
T90    26.944   -2.944   24.000
T50     9.168    0.688    9.856
Peak    1.000    0.980    1.980
 
 
====== 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      -1.449    -0.172      0.171       -           -               -         4.63e-03     -4.74e-04          4.72e-04      45.520   57
CPL     -0.729    -0.711      0.847       92.177     -25.456       890.846      1.04e-02     -5.62e-03          1.54e-02      42.540   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      -1.309     -0.253     0.255       -           -               -         1.86e-02     -3.06e-03          3.06e-03      62.650   57
CPL      0.015     -1.126     1.580       82.052     -21.508       143.787      7.91e-02     -7.91e-02          3.51e-01      58.450   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   1.87e-07  3.55e-07  5.20e-07  1.63e-06  1.47e-06  2.69e-06   erg/cm2
      90%_error_low -3.18e-08 -3.83e-08 -6.71e-08 -4.07e-07 -1.64e-07 -4.64e-07   erg/cm2
      90%_error_hi   3.33e-08  3.80e-08  6.65e-08  4.87e-07  1.65e-07  5.29e-07   erg/cm2
Peak flux       PL   6.37e-01  7.18e-01  5.80e-01  7.79e-01  2.22e+00  2.71e+00   ph/cm2/s
      90%_error_low -1.76e-01 -1.35e-01 -1.08e-01 -2.54e-01 -3.78e-01 -4.53e-01   ph/cm2/s
      90%_error_hi   1.91e-01  1.33e-01  1.07e-01  3.13e-01  3.79e-01  4.56e-01   ph/cm2/s
 
Fluence        CPL   1.63e-07  3.79e-07  5.50e-07  6.67e-07  1.41e-06  1.76e-06   erg/cm2
      90%_error_low -3.97e-08 -4.56e-08 -7.62e-08 -3.58e-07 -1.75e-07 -3.96e-07   erg/cm2
      90%_error_hi   4.07e-08  4.71e-08  7.82e-08  9.47e-07  1.76e-07  9.35e-07   erg/cm2
Peak flux      CPL   4.78e-01  7.95e-01  6.70e-01  2.80e-01  2.14e+00  2.22e+00   ph/cm2/s
      90%_error_low -2.05e-01 -1.63e-01 -1.36e-01 -1.78e-01 -3.87e-01 -4.32e-01   ph/cm2/s
      90%_error_hi   2.28e-01  1.69e-01  1.41e-01  3.90e-01  3.87e-01  5.01e-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
   93.5056    64.0739   0.0128    37.0464   -87.5126         2.5372834     15.054 TRIG_00356912                 
 
Foreground time interval of the image:
 -5.408  27.760 (delta_t =  33.168 [sec])
Background time interval of the image:
-239.776  -5.408 (delta_t = 234.368 [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   -5.408 sec. to   27.760 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44926     ( -0.171826   0.170551 )
Norm@50keV  : 4.63401E-03    ( -0.00047377   0.000472473 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.52 using 59 PHA bins.
# Reduced chi-squared =         0.7985 for     57 degrees of freedom 
# Null hypothesis probability =   8.630173e-01
 
Photon flux (15-150 keV)    in 33.17 sec: 0.570986 ( -0.059094  0.059206 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.47128e-06 ( -1.63801e-07  1.6499e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -5.408 sec. to   27.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.728849     ( -0.71102   0.846619 )
Epeak [keV] : 92.1773      ( -25.4556 890.845 )
Norm@50keV  : 1.03870E-02    ( -0.00561807   0.0154059 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.54 using 59 PHA bins.
# Reduced chi-squared =         0.7596 for     56 degrees of freedom 
# Null hypothesis probability =   9.077192e-01
 
Photon flux (15-150 keV)    in 33.17 sec: 0.553506 ( -0.062058  0.061759 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.41181e-06 ( -1.74649e-07  1.75881e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.980 sec. to    1.980 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30869     ( -0.252664   0.254805 )
Norm@50keV  : 1.85740E-02    ( -0.00305675   0.00305667 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.65 using 59 PHA bins.
# Reduced chi-squared =          1.099 for     57 degrees of freedom 
# Null hypothesis probability =   2.826917e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.21956 ( -0.37795  0.37926 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.83177e-07 ( -3.21168e-08  3.22946e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.980 sec. to    1.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.0147339     ( -1.1261   1.58004 )
Epeak [keV] : 82.0523      ( -21.5077 143.787 )
Norm@50keV  : 7.90551E-02    ( -0.0790551   0.351358 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.45 using 59 PHA bins.
# Reduced chi-squared =          1.044 for     56 degrees of freedom 
# Null hypothesis probability =   3.855231e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.14156 ( -0.38664  0.3872 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.74614e-07 ( -3.43036e-08  3.41185e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 26.944 sec.
Hardness ratio (energy fluence ratio) = 1.46487384431

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

    S(15-50 keV)  = 5.419053e-07
S(50-150 keV) = 9.293833e-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 = 3.275944959142454E-02, IMY = 7.541145878494562E-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:
-239.776000 -5.408000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1135  40.9465  836.8  37.8   60.3  -0.0061  -0.0    0.4	Cyg X-3                       
326.4314  38.3165    3.5  42.2   39.0  -1.2875  -3.3   12.2	Cyg X-2                       
252.6283  58.6298    2.6  23.8  136.4   0.8552   4.5 ------	UNKNOWN                       
209.1629  35.6181    2.2  54.2  171.0   3.7781   5.3 ------	UNKNOWN                       
357.3735  36.5416    2.3  49.0    5.7   1.8066   5.0 ------	UNKNOWN                       
 58.7320  51.6261    1.9  45.9  -56.9   4.4167   6.2 ------	UNKNOWN

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

    Time interval of the image:
-5.408000 27.760000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0292  41.0969    5.0  37.7   60.4  -0.3327  -2.3    9.4	Cyg X-3                       
326.0992  38.4517   19.3  42.0   39.4   0.0878   0.6    8.5	Cyg X-2                       
352.5852  34.0305    2.2  50.5   11.5   0.8980   5.3 ------	UNKNOWN                       
202.7601  36.5299    2.2  54.6  177.5   1.2103   5.3 ------	UNKNOWN                       
197.4027  48.6080    2.2  44.0 -173.2   0.4956   5.3 ------	UNKNOWN                       
 93.5056  64.0738    0.8  37.0  -87.5   2.5371  15.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
273.124590 378.724590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4750  35.2909   13.2  34.0  146.8   0.1522   0.9    3.2	Her X-1                       
299.5801  35.1972    0.5  26.3   71.0   3.8749  25.2    0.6	Cyg X-1                       
307.9834  41.1243    0.0  22.5   51.5   0.3022   2.4   11.8	Cyg X-3                       
326.1859  38.3383   34.1  31.8   27.2  -0.0482  -0.3    1.2	Cyg X-2                       
225.2344  38.7309    2.3  44.9 -179.8   0.9876   5.0 ------	UNKNOWN                       
179.1819  61.8717    2.5  46.5 -128.4   2.1469   4.7 ------	UNKNOWN