Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 23:16:45 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger450545
======================================================================

  Trigger: 00450545      Segment: 000

  BAT Trigger Time: 323395984   [s; MET]
      Trigger Stop: 323396056   [s; MET]
               UTC: 2011-04-02T00:12:57.186040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 197.4192884111   Dec: 61.2417618407497  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.87
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    11.87

  Analysis Position:   [ source = BAT ]
    RA: 197.4192884111   Dec: 61.2417618407497  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 197.429707045456   Dec: 61.2460421050919  [deg; J2000]  
        { 13h 09m 43.1s , +61d 14' 45.8" }
         +/- 1.71352760722518 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.538760768971104 [arcmin] (formal 1-sigma fit error)
    SNR: 14.0925060104224
 
  Angular difference between the analysis and refined position is 0.395468 arcmin
 
  Partial Coding Fraction: 0.1074219    [ including projection effects ]

  Duration
     T90: 56.2080000042915 +/- 5.08057952165159
        Measured from: 2.53600001335144
                   to: 58.744000017643     [s; relative to TRIGTIME]
     T50: 30.5760000348091 +/- 5.55409756620577
        Measured from: 5.95999997854233
                   to: 36.5360000133514     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.18000000715256     
                   to: 4.18000000715256     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.375999987125397     
                   to: 62.5360000133514     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.189034   1.822871   1.303530   0.513078
           0.147609   0.155162   0.138367   0.119249 [error]
 Peak      0.074385   0.156153   0.178422   0.083909
           0.022092   0.025380   0.024947   0.021125 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   62.912   -0.376   62.536
T90    56.208    2.536   58.744
T50    30.576    5.960   36.536
Peak    1.000    3.180    4.180
 
 
====== 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      -1.563    -0.166      0.165       -           -               -         5.48e-03     -5.31e-04          5.29e-04      58.100   57
CPL     -1.289    -0.417      0.760      132.661     -64.667      -132.661      7.52e-03     -7.52e-03          1.02e-02      57.620   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      -0.954     -0.262     0.279       -           -               -         3.59e-02     -5.74e-03          5.62e-03      43.780   57
CPL     -0.948     -0.264     1.001     9997.690    -9997.690      -9997.690      3.61e-02     -5.38e-03          5.22e-02      43.780   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   4.67e-07  8.27e-07  1.12e-06  3.12e-06  3.24e-06  5.53e-06   erg/cm2
      90%_error_low -7.64e-08 -8.49e-08 -1.37e-07 -7.48e-07 -3.33e-07 -8.65e-07   erg/cm2
      90%_error_hi   8.00e-08  8.42e-08  1.36e-07  8.89e-07  3.35e-07  9.72e-07   erg/cm2
Peak flux       PL   4.96e-05  7.74e-04  2.37e-02  2.87e+00  5.60e-02  2.89e+00   ph/cm2/s
      90%_error_low     N/A   1.72e-03 4.52e-03 -4.25e-01 7.17e-02 -4.05e-01   ph/cm2/s
      90%_error_hi      N/A    7.58e-03  5.75e-02  2.57e+00  2.86e-01  2.65e+00   ph/cm2/s
 
Fluence        CPL   4.46e-07  8.50e-07  1.14e-06  2.10e-06  3.19e-06  4.54e-06   erg/cm2
      90%_error_low -9.25e-08 -1.01e-07 -1.50e-07 -1.24e-06 -3.64e-07 -1.28e-06   erg/cm2
      90%_error_hi   8.82e-08  1.05e-07  1.54e-07  1.25e-06  3.58e-07  1.57e-06   erg/cm2
Peak flux      CPL   8.80e-01  1.22e+00  1.25e+00  2.49e+00  4.13e+00  5.87e+00   ph/cm2/s
      90%_error_low -1.99e-01 -2.69e-01 -1.86e-01 -1.44e+00 -7.02e-01 -1.73e+00   ph/cm2/s
      90%_error_hi   3.17e-01  2.70e-01  2.61e-01  7.49e-01  6.81e-01  7.59e-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
  197.4297    61.2460   0.0136    48.0710    28.1108         5.0016921     14.093 TRIG_00450545                 
 
Foreground time interval of the image:
 -0.376  62.536 (delta_t =  62.912 [sec])
Background time interval of the image:
-239.000  -0.376 (delta_t = 238.624 [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   -0.376 sec. to   62.536 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.56299     ( -0.166   0.164766 )
Norm@50keV  : 5.48497E-03    ( -0.000530734   0.000529192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.10 using 59 PHA bins.
# Reduced chi-squared =          1.019 for     57 degrees of freedom 
# Null hypothesis probability =   4.344281e-01
 
Photon flux (15-150 keV)    in 62.91 sec: 0.697024 ( -0.06979  0.070006 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.24295e-06 ( -3.32969e-07  3.34553e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.376 sec. to   62.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.28859     ( -0.416629   0.760032 )
Epeak [keV] : 132.661      ( -64.7016 -132.696 )
Norm@50keV  : 7.51919E-03    ( -0.00751821   0.0101812 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.62 using 59 PHA bins.
# Reduced chi-squared =          1.029 for     56 degrees of freedom 
# Null hypothesis probability =   4.151509e-01
 
Photon flux (15-150 keV)    in 62.91 sec: 0.688904 ( -0.072615  0.072612 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.18977e-06 ( -3.63786e-07  3.58116e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    3.180 sec. to    4.180 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.954182     ( -0.261641   0.278913 )
Norm@50keV  : 3.58569E-02    ( -0.00574348   0.00561678 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.78 using 59 PHA bins.
# Reduced chi-squared =         0.7680 for     57 degrees of freedom 
# Null hypothesis probability =   9.007880e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.59987E-02 0.149570 9.43861E-02 6.22225E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.94267e-07 ( -6.00489e-08  6.01243e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    3.180 sec. to    4.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.94764     ( -0.263636   1.00119 )
Epeak [keV] : 9997.69      ( -9998.12 -9998.12 )
Norm@50keV  : 3.60826E-02    ( -0.00538168   0.052243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.78 using 59 PHA bins.
# Reduced chi-squared =         0.7818 for     56 degrees of freedom 
# Null hypothesis probability =   8.824237e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.12934 ( -0.70218  0.68146 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.94575e-07 ( -6.2015e-08  5.98268e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 56.208 sec.
Hardness ratio (energy fluence ratio) = 1.35381740349

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

    S(15-50 keV)  = 1.2939758e-06
S(50-150 keV) = 1.9490145e-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 = 9.820485789151535E-01, IMY = -5.246021422344366E-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:
-239.000000 -0.376000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6217  22.0189    0.3  33.4 -152.9   9.5050  42.0    0.7	Crab                          
 96.7625  13.5343    3.0  37.8 -177.9   0.9335   3.9 ------	UNKNOWN                       
 99.9314  50.8914    2.5   3.6  -95.5   0.8925   4.6 ------	UNKNOWN                       
 77.8571   1.4296    2.5  54.5 -157.2   2.9402   4.7 ------	UNKNOWN                       
 72.1468  12.6862    2.6  46.7 -144.4   2.0297   4.5 ------	UNKNOWN

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

    Time interval of the image:
-0.376000 62.536000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7913  21.8624    0.0  33.5 -153.3   0.1011   0.9   12.7	Crab                          
197.4297  61.2460    0.8  48.1   28.1   5.0015  14.1 ------	UNKNOWN                       
121.8558  30.6120    2.2  23.4  130.6   0.5811   5.3 ------	UNKNOWN                       
 84.2456  47.4098    1.9  14.4 -106.7   0.5344   6.0 ------	UNKNOWN                       
350.3175  66.8091    2.4  52.9  -38.7   1.9009   4.9 ------	UNKNOWN                       
 52.8848  33.3922    2.6  41.8 -105.7   1.6602   4.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
528.500590 963.055600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5366  35.4350    8.6  43.8    2.2   0.8209   1.3    6.8	Her X-1                       
193.7112  31.1033    3.2  30.3   89.5   2.0370   3.6 ------	UNKNOWN                       
262.1645  24.3355    3.3  56.7    3.0   6.5862   3.5 ------	UNKNOWN                       
266.0068  40.0991    3.0  45.6  -12.1   2.0241   3.9 ------	UNKNOWN                       
152.6964  70.6034    2.8  19.9 -140.3   1.2410   4.2 ------	UNKNOWN                       
 88.7780  49.6875    4.9  55.3 -145.1   4.4123   2.4 ------	UNKNOWN