Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Jan 17 18:49:09 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger420367
======================================================================

  Trigger: 00420367      Segment: 000

  BAT Trigger Time: 293819568   [s; MET]
      Trigger Stop: 293819632   [s; MET]
               UTC: 2010-04-24T16:32:42.263180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 209.453330722996   Dec: 1.51343266694002  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.47
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.47

  Analysis Position:   [ source = BAT ]
    RA: 209.453330722996   Dec: 1.51343266694002  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 209.444975838635   Dec: 1.52375254249162  [deg; J2000]  
        { 13h 57m 46.8s , +01d 31' 25.5" }
         +/- 1.35854646636717 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.494360887215739 [arcmin] (formal 1-sigma fit error)
    SNR: 19.6341432578086
 
  Angular difference between the analysis and refined position is 0.796566 arcmin
 
  Partial Coding Fraction: 0.8828125    [ including projection effects ]

  Duration
     T90: 104 +/- 14.560219778561
        Measured from: 27
                   to: 131     [s; relative to TRIGTIME]
     T50: 44 +/- 8.94427190999916
        Measured from: 46
                   to: 90     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 75     
                   to: 76     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 22     
                   to: 147     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.985837   1.104502   0.599253   0.088022
           0.060066   0.060825   0.053893   0.048584 [error]
 Peak      0.007358   0.028922   0.001495   0.013557
           0.005471   0.005652   0.005024   0.004537 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  125.000   22.000  147.000
T90   104.000   27.000  131.000
T50    44.000   46.000   90.000
Peak    1.000   75.000   76.000
 
 
====== 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      -1.834    -0.131      0.127       -           -               -         1.31e-03     -1.02e-04          1.01e-04      52.530   57
CPL     -1.690    -0.449      0.506       95.251     -73.892       -95.251      1.57e-03     -5.24e-04          1.39e-03      52.250   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      -1.726     -0.753     0.681       -           -               -         2.48e-03     -1.15e-03          1.09e-03      60.190   57
CPL      5.008      N/A       N/A          34.673      N/A           N/A         5.40e+01        N/A               N/A         55.620   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   2.85e-07  4.28e-07  4.80e-07  1.02e-06  1.50e-06  2.21e-06   erg/cm2
      90%_error_low -2.92e-08 -2.81e-08 -5.20e-08 -2.11e-07 -1.18e-07 -2.64e-07   erg/cm2
      90%_error_hi   2.99e-08  2.81e-08  5.24e-08  2.47e-07  1.19e-07  2.92e-07   erg/cm2
Peak flux       PL   1.27e-01  1.12e-01  6.75e-02  6.17e-02  3.33e-01  3.68e-01   ph/cm2/s
      90%_error_low -6.62e-02 -4.23e-02 -3.78e-02 -6.17e-02 -1.26e-01 -1.43e-01   ph/cm2/s
      90%_error_hi   7.14e-02  4.22e-02  4.00e-02  1.00e-01  1.26e-01  1.49e-01   ph/cm2/s
 
Fluence        CPL   2.80e-07  4.35e-07  4.79e-07  7.79e-07  1.48e-06  1.97e-06   erg/cm2
      90%_error_low -3.30e-08 -1.74e-08 -5.40e-08 -4.37e-07 -1.42e-07 -4.68e-07   erg/cm2
      90%_error_hi   3.09e-08  3.61e-08  5.36e-08  5.90e-07  1.38e-07  3.41e-07   erg/cm2
Peak flux      CPL   7.11e-02  2.12e-01  9.52e-03  1.62e-07  2.74e-01  2.74e-01   ph/cm2/s
      90%_error_low -3.05e-02 -7.60e-02 -5.95e-03 -1.62e-07 -7.78e-02 -7.76e-02   ph/cm2/s
      90%_error_hi   6.49e-02  5.91e-02  2.16e-02  5.04e-05  1.18e-01  1.18e-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
  209.4450     1.5238   0.0098    12.5011    75.5724         1.5880253     19.634 TRIG_00420367                 
 
Foreground time interval of the image:
 22.000  72.501 (delta_t =  50.501 [sec])
Background time interval of the image:
-239.000  22.000 (delta_t = 261.000 [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   22.000 sec. to  147.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.83369     ( -0.130547   0.127401 )
Norm@50keV  : 1.30503E-03    ( -0.000102076   0.000100641 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.53 using 59 PHA bins.
# Reduced chi-squared =         0.9216 for     57 degrees of freedom 
# Null hypothesis probability =   6.432679e-01
 
Photon flux (15-150 keV)    in 125 sec: 0.182244 ( -0.012116  0.012124 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50061e-06 ( -1.17715e-07  1.19406e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   22.000 sec. to  147.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.68999     ( -0.448638   0.506369 )
Epeak [keV] : 95.2508      ( -73.8948 -95.254 )
Norm@50keV  : 1.56731E-03    ( -0.00052372   0.0013882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.25 using 59 PHA bins.
# Reduced chi-squared =         0.9330 for     56 degrees of freedom 
# Null hypothesis probability =   6.175748e-01
 
Photon flux (15-150 keV)    in 125 sec: 0.180817 ( -0.012926  0.012887 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.4753e-06 ( -1.41718e-07  1.37721e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   75.000 sec. to   76.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72637     ( -0.753013   0.681 )
Norm@50keV  : 2.48017E-03    ( -0.00115093   0.00108649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.19 using 59 PHA bins.
# Reduced chi-squared =          1.056 for     57 degrees of freedom 
# Null hypothesis probability =   3.612455e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.332502 ( -0.125728  0.12573 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.29229e-08 ( -1.02956e-08  1.12443e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   75.000 sec. to   76.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 9.99879     (       )
Epeak [keV] : 34.1381      (   )
Norm@50keV  : 7.97022E+04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.84 using 59 PHA bins.
# Reduced chi-squared =         0.9435 for     56 degrees of freedom 
# Null hypothesis probability =   5.953226e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.274301 ( -0.077792  0.11809 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.38871e-08 ( -3.97924e-09  5.96333e-09 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 104.0 sec.
Hardness ratio (energy fluence ratio) = 1.12219938128

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

    S(15-50 keV)  = 7.1297e-07
S(50-150 keV) = 7.876251e-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 = 5.524171885275363E-02, IMY = -2.147234447245690E-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 22.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3704  35.4052    8.9  52.5  -15.3   0.7120   1.3    5.7	Her X-1                       
247.5452  25.0657    2.2  44.7   -3.2   1.9016   5.2 ------	UNKNOWN                       
247.0106  47.3253    2.7  51.5  -31.9   2.8176   4.3 ------	UNKNOWN                       
154.6718  27.7805    3.7  47.2 -132.4   2.2785   3.1 ------	UNKNOWN                       
236.5316  54.7485    2.8  50.6  -44.6   4.9173   4.2 ------	UNKNOWN

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

    Time interval of the image:
22.000000 72.500590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4863  35.2816    6.5  52.5  -15.1  -0.3524  -1.8    3.9	Her X-1                       
209.4450   1.5238    0.6  12.5   75.6   1.5879  19.6 ------	UNKNOWN                       
147.9971  22.5064    3.2  52.7 -140.0   1.4403   3.6 ------	UNKNOWN                       
202.9436  54.5354    2.2  42.7  -68.9   1.4544   5.2 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
108.700600 963.108500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9810 -15.6357    0.3  39.1   37.9  57.7415  43.4    0.3	Sco X-1                       
254.5476  35.3761   11.2  53.8  -33.8  -3.9132  -1.0    4.8	Her X-1                       
189.1843  -9.0804    3.5  22.8  162.4   1.7530   3.3 ------	UNKNOWN                       
261.7830   7.9532    2.5  52.5    1.6   8.4374   4.6 ------	UNKNOWN                       
174.9255  33.2922    3.0  45.3 -121.3   9.6946   3.9 ------	UNKNOWN