Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 15:46:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger435903
======================================================================

  Trigger: 00435903      Segment: 000

  BAT Trigger Time: 308249001.472   [s; MET]
      Trigger Stop: 308249002.496   [s; MET]
               UTC: 2010-10-08T16:43:15.219700    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 328.890606987462   Dec: 37.0622663135631  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.7
     Image Trigger?:     NO
     Rate S/N Ratio:     21.1660104885167  [ if not an image trigger ]
     Image S/N Ratio:    10.7

  Analysis Position:   [ source = BAT ]
    RA: 328.890606987462   Dec: 37.0622663135631  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 328.880601859487   Dec: 37.0608694077223  [deg; J2000]  
        { 21h 55m 31.3s , +37d 03' 39.1" }
         +/- 2.17815564950326 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.945139580547429 [arcmin] (formal 1-sigma fit error)
    SNR: 10.0030910427774
 
  Angular difference between the analysis and refined position is 0.486316 arcmin
 
  Partial Coding Fraction: 0.5859375    [ including projection effects ]

  Duration
     T90: 103.504000067711 +/- 34.0406796967367
        Measured from: -1.83200001716614
                   to: 101.672000050545     [s; relative to TRIGTIME]
     T50: 44.2080000042915 +/- 21.4434206146522
        Measured from: 0.504000008106232
                   to: 44.7120000123978     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.435999989509583     
                   to: 0.564000010490417     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.11199998855591     
                   to: 106.055999994278     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.562625   0.533550   0.549527   0.163251
           0.076076   0.078647   0.070757   0.064640 [error]
 Peak      0.040507   0.065158   0.060760   0.038922
           0.007849   0.008805   0.008122   0.007222 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  109.168   -3.112  106.056
T90   103.504   -1.832  101.672
T50    44.208    0.504   44.712
Peak    1.000   -0.436    0.564
 
 
====== 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      -1.554    -0.245      0.240       -           -               -         1.12e-03     -1.51e-04          1.49e-04      61.490   57
CPL     -1.551    -0.248      0.323     9999.350    -9999.350      -9999.350      1.12e-03     -1.12e-03          1.16e-03      61.500   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      -1.231     -0.246     0.251       -           -               -         1.33e-02     -1.78e-03          1.78e-03      56.710   57
CPL     -1.236     -1.406     0.312     9999.340      N/A           N/A         1.34e-02        N/A               N/A         56.730   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   1.65e-07  2.93e-07  3.99e-07  1.12e-06  1.15e-06  1.98e-06   erg/cm2
      90%_error_low -3.64e-08 -3.99e-08 -7.19e-08 -3.84e-07 -1.68e-07 -4.48e-07   erg/cm2
      90%_error_hi   3.87e-08  3.94e-08  7.08e-08  5.00e-07  1.70e-07  5.40e-07   erg/cm2
Peak flux       PL   4.24e-01  5.01e-01  4.26e-01  6.17e-01  1.57e+00  1.97e+00   ph/cm2/s
      90%_error_low -1.10e-01 -8.21e-02 -6.70e-02 -1.88e-01 -2.19e-01 -2.73e-01   ph/cm2/s
      90%_error_hi   1.20e-01  7.98e-02  6.56e-02  2.36e-01  2.20e-01  2.78e-01   ph/cm2/s
 
Fluence        CPL   1.67e-07  2.88e-07  3.95e-07  1.22e-06  1.16e-06  1.95e-06   erg/cm2
      90%_error_low    N/A    -4.53e-08 -8.15e-08 -7.81e-07 -2.10e-07 -6.83e-07   erg/cm2
      90%_error_hi     N/A     5.57e-08  8.78e-08  1.50e-07  1.98e-07  5.41e-07   erg/cm2
Peak flux      CPL   4.24e-01  5.01e-01  4.26e-01  6.13e-01  1.57e+00  1.98e+00   ph/cm2/s
      90%_error_low     N/A   -8.23e-02     N/A       N/A   -2.19e-01 -3.62e-01   ph/cm2/s
      90%_error_hi      N/A    7.96e-02     N/A       N/A    2.20e-01  2.65e-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
  328.8806    37.0609   0.0193    39.6702  -162.7117         1.8183116     10.003 TRIG_00435903                 
 
Foreground time interval of the image:
 -3.112 106.056 (delta_t = 109.168 [sec])
Background time interval of the image:
-210.971  -3.112 (delta_t = 207.859 [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   -3.112 sec. to  106.056 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.55366     ( -0.245279   0.240242 )
Norm@50keV  : 1.12222E-03    ( -0.000151177   0.000149357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.49 using 59 PHA bins.
# Reduced chi-squared =          1.079 for     57 degrees of freedom 
# Null hypothesis probability =   3.184796e-01
 
Photon flux (15-150 keV)    in 109.2 sec: 0.142221 ( -0.018821  0.018904 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15322e-06 ( -1.68226e-07  1.70065e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -3.112 sec. to  106.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.55078     ( -0.248064   0.322967 )
Epeak [keV] : 9999.35      ( -9999.36 -9999.36 )
Norm@50keV  : 1.12359E-03    ( -0.00112525   0.00116239 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.50 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     56 degrees of freedom 
# Null hypothesis probability =   2.857921e-01
 
Photon flux (15-150 keV)    in 109.2 sec: 0.142219 ( -0.01886  0.018878 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.15999e-06 ( -2.09662e-07  1.98083e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.436 sec. to    0.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.23147     ( -0.245548   0.25076 )
Norm@50keV  : 1.33153E-02    ( -0.00177922   0.00177891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.71 using 59 PHA bins.
# Reduced chi-squared =         0.9949 for     57 degrees of freedom 
# Null hypothesis probability =   4.859084e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.57023 ( -0.21886  0.21997 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.33934e-07 ( -1.9704e-08  1.98283e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.436 sec. to    0.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.12081     ( -0.521615   1.19686 )
Epeak [keV] : 44.2349      (   )
Norm@50keV  : 3.42254E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.30 using 59 PHA bins.
# Reduced chi-squared =         0.9876 for     56 degrees of freedom 
# Null hypothesis probability =   5.011318e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.56998 ( -0.21924  0.21976 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.34589e-07 ( -2.74938e-08  2.63421e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 103.504 sec.
Hardness ratio (energy fluence ratio) = 1.36260509098

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

    S(15-50 keV)  = 4.571987e-07
S(50-150 keV) = 6.960228e-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 = -7.918702745295987E-01, IMY = 2.464628093905808E-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:
-210.971400 -3.112000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6189  21.9961    1.5  56.0    4.0   6.9833   7.5    1.4	Crab                          
308.0504  40.9378    5.5  53.1 -149.1   1.2270   2.1    2.9	Cyg X-3                       
326.2265  38.2847    4.3  41.2 -159.8   0.7004   2.7    3.4	Cyg X-2                       
 41.3345   4.2020    2.2  40.9   61.9   3.1831   5.2 ------	UNKNOWN                       
 90.1243  45.5032    3.7  49.7  -25.4   1.1650   3.1 ------	UNKNOWN                       
101.8581  42.4079    2.7  58.7  -26.2   5.3097   4.4 ------	UNKNOWN                       
336.7820  77.3938    3.8  41.1  -98.2   2.7380   3.0 ------	UNKNOWN

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

    Time interval of the image:
-3.112000 106.056000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5688  21.9505    4.3  55.9    4.1  -2.0005  -2.7    5.3	Crab                          
308.1532  40.7253    0.0  53.1 -149.4  -0.3643  -0.8   13.8	Cyg X-3                       
326.2080  38.5248    9.7  41.1 -159.4  -0.2201  -1.2   12.3	Cyg X-2                       
328.8805  37.0609    1.2  39.7 -162.7   1.8183   9.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
699.728610 962.599500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6288  22.0153    0.3  32.1  -36.2  10.8297  42.8    0.2	Crab                          
 92.5576   1.6634    2.1  50.8  -17.7   2.4918   5.4 ------	UNKNOWN                       
 21.7003  82.6703    2.5  51.8 -139.6   4.9553   4.6 ------	UNKNOWN