Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Jan 14 00:34:43 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger444230
======================================================================

  Trigger: 00444230      Segment: 000

  BAT Trigger Time: 318245715.52   [s; MET]
      Trigger Stop: 318245716.544   [s; MET]
               UTC: 2011-02-01T09:35:08.899340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 137.065563354374   Dec: 88.6075583363001  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.8
     Image Trigger?:     NO
     Rate S/N Ratio:     36.2491379207837  [ if not an image trigger ]
     Image S/N Ratio:    9.8

  Analysis Position:   [ source = BAT ]
    RA: 137.065563354374   Dec: 88.6075583363001  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 137.501912192143   Dec: 88.6106160850771  [deg; J2000]  
        { 09h 10m 00.5s , +88d 36' 38.2" }
         +/- 1.33131739229051 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.664734248542096 [arcmin] (formal 1-sigma fit error)
    SNR: 20.2103218188059
 
  Angular difference between the analysis and refined position is 0.661457 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 14.0919999480247 +/- 2.19557738071212
        Measured from: -1.69199997186661
                   to: 12.3999999761581     [s; relative to TRIGTIME]
     T50: 6.25999993085861 +/- 0.755618928605671
        Measured from: 0.896000027656555
                   to: 7.15599995851517     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.283999979496002     
                   to: 0.716000020503998     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.84799998998642     
                   to: 14.432000041008     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.215436   0.368232   0.362547   0.122898
           0.019484   0.020687   0.019287   0.016862 [error]
 Peak      0.016073   0.048168   0.060189   0.027747
           0.004979   0.005505   0.005497   0.004937 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   17.280   -2.848   14.432
T90    14.092   -1.692   12.400
T50     6.260    0.896    7.156
Peak    1.000   -0.284    0.716
 
 
====== 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: 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      -1.116    -0.107      0.108       -           -               -         3.97e-03     -2.33e-04          2.33e-04      74.970   57
CPL     -0.942    -0.225      0.431      339.055    -339.055      -339.055      4.77e-03     -9.82e-04          2.60e-03      74.420   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      -0.674     -0.189     0.200       -           -               -         9.47e-03     -1.12e-03          1.10e-03      49.980   57
CPL      0.195     -0.847     1.093      151.860     -52.817      2464.840      2.19e-02     -1.20e-02          3.72e-02      46.970   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   6.12e-08  1.42e-07  2.63e-07  1.16e-06  7.14e-07  1.63e-06   erg/cm2
      90%_error_low -7.11e-09 -9.88e-09 -1.84e-08 -1.77e-07 -4.70e-08 -1.89e-07   erg/cm2
      90%_error_hi   7.40e-09  9.81e-09  1.83e-08  2.00e-07  4.73e-08  2.08e-07   erg/cm2
Peak flux       PL   1.78e-01  2.94e-01  3.68e-01  9.18e-01  1.10e+00  1.76e+00   ph/cm2/s
      90%_error_low -4.25e-02 -4.54e-02 -4.09e-02 -2.05e-01 -1.22e-01 -2.26e-01   ph/cm2/s
      90%_error_hi   4.68e-02  4.50e-02  4.07e-02  2.45e-01  1.22e-01  2.44e-01   ph/cm2/s
 
Fluence        CPL   5.88e-08  1.44e-07  2.67e-07  9.08e-07  7.06e-07  1.38e-06   erg/cm2
      90%_error_low -8.97e-09 -1.02e-08 -2.08e-08 -3.77e-07 -5.07e-08 -3.76e-07   erg/cm2
      90%_error_hi   7.96e-09  1.08e-08  2.12e-08  4.51e-07  4.97e-08  2.85e-07   erg/cm2
Peak flux      CPL   1.37e-01  3.01e-01  4.06e-01  4.35e-01  1.06e+00  1.28e+00   ph/cm2/s
      90%_error_low -5.27e-02 -5.07e-02 -5.47e-02 -2.07e-01 -1.28e-01 -2.46e-01   ph/cm2/s
      90%_error_hi   5.79e-02  5.06e-02  5.61e-02  2.84e-01  1.27e-01  4.76e-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
  137.5019    88.6106   0.0095    10.4304   -95.9331         1.1819378     20.210 TRIG_00444230                 
 
Foreground time interval of the image:
 -2.848  14.432 (delta_t =  17.280 [sec])
Background time interval of the image:
-12.819  -2.848 (delta_t =   9.971 [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   -2.848 sec. to   14.432 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.11628     ( -0.107175   0.108193 )
Norm@50keV  : 3.97003E-03    ( -0.000233239   0.000233159 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.97 using 59 PHA bins.
# Reduced chi-squared =          1.315 for     57 degrees of freedom 
# Null hypothesis probability =   5.545721e-02
 
Photon flux (15-150 keV)    in 17.28 sec: 0.461250 ( -0.027833  0.027885 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.13647e-07 ( -4.70032e-08  4.72815e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -2.848 sec. to   14.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.941886     ( -0.225283   0.430638 )
Epeak [keV] : 339.055      ( -339.055 -339.055 )
Norm@50keV  : 4.76767E-03    ( -0.000982113   0.00259703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.42 using 59 PHA bins.
# Reduced chi-squared =          1.329 for     56 degrees of freedom 
# Null hypothesis probability =   5.041820e-02
 
Photon flux (15-150 keV)    in 17.28 sec: 0.457135 ( -0.029375  0.0292 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.05803e-07 ( -5.06639e-08  4.97301e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.284 sec. to    0.716 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.674177     ( -0.189234   0.200266 )
Norm@50keV  : 9.47103E-03    ( -0.00111782   0.00110175 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.98 using 59 PHA bins.
# Reduced chi-squared =         0.8768 for     57 degrees of freedom 
# Null hypothesis probability =   7.335277e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.09714 ( -0.122153  0.12247 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16982e-07 ( -1.35917e-08  1.36652e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.284 sec. to    0.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.195002     ( -0.847385   1.09259 )
Epeak [keV] : 151.860      ( -52.8167 2464.84 )
Norm@50keV  : 2.19466E-02    ( -0.0120316   0.0371949 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.97 using 59 PHA bins.
# Reduced chi-squared =         0.8388 for     56 degrees of freedom 
# Null hypothesis probability =   7.994623e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.06320 ( -0.127646  0.12734 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12347e-07 ( -1.50611e-08  1.4766e-08 ) 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 = -1.902801649953838E-02, IMY = 1.830964893162891E-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:
-12.819400 -2.848000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
130.3385  52.5024    2.7  25.7   88.6   0.1592   4.3 ------	UNKNOWN                       
352.4102  52.2830    3.0  47.5 -127.6   0.4537   3.8 ------	UNKNOWN

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

    Time interval of the image:
-2.848000 14.432000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 67.1047  37.2349    2.7  49.0  159.6   0.8171   4.3 ------	UNKNOWN                       
137.5034  88.6106    0.6  10.4  -95.9   1.1820  20.2 ------	UNKNOWN                       
222.8200  35.0522    2.3  55.6  -13.5   1.0622   4.9 ------	UNKNOWN                       
240.5830  37.6573    2.4  56.5  -31.0   1.6122   4.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
50.780610 962.564400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5144  35.2442   10.3  55.4  -30.6   3.2162   1.1    6.5	Her X-1                       
210.9302  33.9613    3.0  55.7   13.0   7.6392   3.8 ------	UNKNOWN                       
 61.2252  57.2631    2.6  32.4  165.7   2.4686   4.4 ------	UNKNOWN                       
 58.5238  60.7846    3.0  29.0  168.8   1.6335   3.8 ------	UNKNOWN                       
239.0544  35.8278    3.4  54.5  -15.2   4.4523   3.4 ------	UNKNOWN