Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 17:12:54 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger350479
======================================================================

  Trigger: 00350479      Segment: 000

  BAT Trigger Time: 262442931.904   [s; MET]
      Trigger Stop: 262442932.416   [s; MET]
               UTC: 2009-04-26T12:48:47.212900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 189.090930330315   Dec: 32.9656829712553  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.03
     Image Trigger?:     NO
     Rate S/N Ratio:     15.2643375224737  [ if not an image trigger ]
     Image S/N Ratio:    8.03

  Analysis Position:   [ source = BAT ]
    RA: 189.090930330315   Dec: 32.9656829712553  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 189.083423821246   Dec: 32.9802091390941  [deg; J2000]  
        { 12h 36m 20.0s , +32d 58' 48.8" }
         +/- 1.71324666033797 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.673473634016666 [arcmin] (formal 1-sigma fit error)
    SNR: 14.0958074988525
 
  Angular difference between the analysis and refined position is 0.949948 arcmin
 
  Partial Coding Fraction: 0.3203125    [ including projection effects ]

  Duration
     T90: 1.23600003123283 +/- 0.253298247287679
        Measured from: 0.0319999754428864
                   to: 1.26800000667572     [s; relative to TRIGTIME]
     T50: 0.439999997615814 +/- 0.198715879551252
        Measured from: 0.299999982118607
                   to: 0.739999979734421     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0340000092983246     
                   to: 0.965999990701675     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0320000052452087     
                   to: 1.33999997377396     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.099943   0.130610   0.073211   0.019366
           0.012923   0.013590   0.011872   0.009535 [error]
 Peak      0.080774   0.107132   0.064400   0.023300
           0.011289   0.012082   0.010523   0.008166 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    1.372   -0.032    1.340
T90     1.236    0.032    1.268
T50     0.440    0.300    0.740
Peak    1.000   -0.034    0.966
 
 
====== 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      -1.837    -0.218      0.207       -           -               -         1.46e-02     -2.11e-03          2.07e-03      57.930   57
CPL     -1.105    -0.801      0.995       55.086     -16.188       -55.086      3.72e-02     -2.32e-02          9.43e-02      55.500   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      -1.740     -0.227     0.217       -           -               -         1.69e-02     -2.50e-03          2.45e-03      55.720   57
CPL     -1.161     -0.727     1.020       67.223     -22.294       -67.223      3.50e-02     -1.97e-02          9.00e-02      54.300   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   3.52e-08  5.27e-08  5.90e-08  1.25e-07  1.85e-07  2.72e-07   erg/cm2
      90%_error_low -6.20e-09 -6.54e-09 -1.12e-08 -4.15e-08 -2.65e-08 -5.47e-08   erg/cm2
      90%_error_hi   6.39e-09  6.54e-09  1.12e-08  5.25e-08  2.69e-08  6.30e-08   erg/cm2
Peak flux       PL   8.77e-01  7.66e-01  4.59e-01  4.14e-01  2.28e+00  2.52e+00   ph/cm2/s
      90%_error_low -1.73e-01 -1.03e-01 -8.56e-02 -1.32e-01 -3.06e-01 -3.37e-01   ph/cm2/s
      90%_error_hi   1.80e-01  1.03e-01  8.51e-02  1.63e-01  3.06e-01  3.38e-01   ph/cm2/s
 
Fluence        CPL   3.26e-08  5.79e-08  5.99e-08  4.34e-08  1.76e-07  1.94e-07   erg/cm2
      90%_error_low -7.05e-09 -8.62e-09 -1.30e-08 -2.99e-08 -2.82e-08 -4.21e-08   erg/cm2
      90%_error_hi   7.08e-09  9.01e-09  1.27e-08  9.69e-08  2.87e-08  9.77e-08   erg/cm2
Peak flux      CPL   8.16e-01  8.23e-01  4.76e-01  2.13e-01  2.25e+00  2.33e+00   ph/cm2/s
      90%_error_low -1.97e-01 -1.30e-01 -9.51e-02 -1.38e-01 -3.10e-01 -3.49e-01   ph/cm2/s
      90%_error_hi   2.00e-01  1.37e-01  9.68e-02  2.63e-01  3.10e-01  4.21e-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
  189.0834    32.9802   0.0136    38.8964    28.2235         0.3440087     14.096 TRIG_00350479                 
 
Foreground time interval of the image:
 -0.032   1.340 (delta_t =   1.372 [sec])
Background time interval of the image:
-239.904  -0.032 (delta_t = 239.872 [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   -0.032 sec. to    1.340 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.83746     ( -0.21819   0.206817 )
Norm@50keV  : 1.46422E-02    ( -0.00211033   0.00206677 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.93 using 59 PHA bins.
# Reduced chi-squared =          1.016 for     57 degrees of freedom 
# Null hypothesis probability =   4.408899e-01
 
Photon flux (15-150 keV)    in 1.372 sec: 2.04783 ( -0.25549  0.25561 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.84784e-07 ( -2.64789e-08  2.68594e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.032 sec. to    1.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10545     ( -0.800794   0.994946 )
Epeak [keV] : 55.0858      ( -16.1878 -55.0858 )
Norm@50keV  : 3.71705E-02    ( -0.0231994   0.094306 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.50 using 59 PHA bins.
# Reduced chi-squared =         0.9912 for     56 degrees of freedom 
# Null hypothesis probability =   4.935501e-01
 
Photon flux (15-150 keV)    in 1.372 sec: 2.00844 ( -0.2594  0.25937 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.75591e-07 ( -2.81551e-08  2.8749e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.034 sec. to    0.966 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.73956     ( -0.226995   0.217348 )
Norm@50keV  : 1.69291E-02    ( -0.00249655   0.00245338 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.72 using 59 PHA bins.
# Reduced chi-squared =         0.9775 for     57 degrees of freedom 
# Null hypothesis probability =   5.233018e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.28046 ( -0.30626  0.30647 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56333e-07 ( -2.36211e-08  2.38941e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.034 sec. to    0.966 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.16136     ( -0.727132   1.0196 )
Epeak [keV] : 67.2229      ( -22.2942 -67.2229 )
Norm@50keV  : 3.49522E-02    ( -0.0197253   0.0899563 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.30 using 59 PHA bins.
# Reduced chi-squared =         0.9697 for     56 degrees of freedom 
# Null hypothesis probability =   5.394361e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.24953 ( -0.31004  0.30993 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50487e-07 ( -2.54093e-08  2.54714e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 1.236 sec.
Hardness ratio (energy fluence ratio) = 1.11930903688

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

    S(15-50 keV)  = 8.79937e-08
S(50-150 keV) = 9.679129e-08

    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 = 7.108730119739337E-01, IMY = -3.815428311607643E-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:
-239.904000 -0.032000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
133.1367 -10.3649    2.3  32.5  178.3   1.0413   5.1 ------	UNKNOWN                       
104.8969 -13.4965    2.9  53.7 -154.6   2.3249   4.0 ------	UNKNOWN                       
158.0651  74.2301    2.8  56.3  -28.4   3.7963   4.1 ------	UNKNOWN

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

    Time interval of the image:
-0.032000 1.340000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
189.0834  32.9802    0.8  38.9   28.2   0.3440  14.1 ------	UNKNOWN                       
182.9527  32.3341    2.7  33.7   27.1   0.0776   4.3 ------	UNKNOWN                       
203.8707  54.1126    1.8  55.1    4.4   0.4716   6.4 ------	UNKNOWN                       
142.9067  63.5257    2.1  45.5  -35.1   0.1269   5.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
68.796600 962.157500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4208  35.4359    7.0  53.1    9.3   3.0659   1.7    5.9	Her X-1                       
188.3766  -9.7607    2.4  42.7  122.4   7.6559   4.7 ------	UNKNOWN                       
165.3073  -8.0726    2.4  46.9  154.6   6.0724   4.7 ------	UNKNOWN                       
151.3480  -4.5691    2.3  51.8  172.3   6.9303   4.9 ------	UNKNOWN                       
162.5275   7.2964    2.8  35.6  171.1   2.2626   4.0 ------	UNKNOWN                       
166.9797  22.5225    3.1  22.1 -171.2   1.4529   3.7 ------	UNKNOWN                       
135.3695   5.7812    2.9  56.7 -165.0   7.0031   3.9 ------	UNKNOWN                       
210.9958  79.0908    5.0  47.0  -53.1   5.1969   2.3 ------	UNKNOWN