Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 20:22:50 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger154112
======================================================================

  Trigger: 00154112      Segment: 000

  BAT Trigger Time: 147850951.104   [s; MET]
      Trigger Stop: 147850953.152   [s; MET]
               UTC: 2005-09-08T05:42:31.386740    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 20.4636377922441   Dec: -12.9713413289566  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.29
     Image Trigger?:     NO
     Rate S/N Ratio:     9.38083151964686  [ if not an image trigger ]
     Image S/N Ratio:    9.29

  Analysis Position:   [ source = BAT ]
    RA: 20.4636377922441   Dec: -12.9713413289566  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 20.4669194304627   Dec: -12.9538449663945  [deg; J2000]  
        { 01h 21m 52.1s , -12d 57' 13.8" }
         +/- 1.4886888869372 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.569753991333922 [arcmin] (formal 1-sigma fit error)
    SNR: 17.2288226091153
 
  Angular difference between the analysis and refined position is 1.067174 arcmin
 
  Partial Coding Fraction: 0.734375    [ including projection effects ]

  Duration
     T90: 18.2840000092983 +/- 3.28171966294318
        Measured from: -4.89599999785423
                   to: 13.3880000114441     [s; relative to TRIGTIME]
     T50: 6.72000002861023 +/- 1.67973448236579
        Measured from: -0.0480000078678131
                   to: 6.67200002074242     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.65599998831749     
                   to: 2.65599998831749     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.81600001454353     
                   to: 15.8400000035763     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.280288   0.350097   0.194908   0.024949
           0.025284   0.026392   0.022774   0.019103 [error]
 Peak      0.017687   0.038734   0.021445   0.007373
           0.005449   0.005799   0.004935   0.004016 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   22.656   -6.816   15.840
T90    18.284   -4.896   13.388
T50     6.720   -0.048    6.672
Peak    1.000    1.656    2.656
 
 
====== 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      -1.833    -0.160      0.154       -           -               -         2.32e-03     -2.42e-04          2.38e-04      54.750   57
CPL     -0.937    -0.688      0.825       50.461      -9.614        31.311      7.52e-03     -4.42e-03          1.48e-02      49.600   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      -1.485     -0.316     0.311       -           -               -         5.61e-03     -1.11e-03          1.09e-03      54.360   57
CPL     -0.229     -1.364     2.077       67.921     -16.252       -67.921      2.52e-02     -2.52e-02          2.60e-01      52.110   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   9.17e-08  1.38e-07  1.55e-07  3.29e-07  4.83e-07  7.13e-07   erg/cm2
      90%_error_low -1.17e-08 -1.22e-08 -2.15e-08 -8.34e-08 -5.03e-08 -1.08e-07   erg/cm2
      90%_error_hi   1.20e-08  1.22e-08  2.18e-08  1.00e-07  5.12e-08  1.21e-07   erg/cm2
Peak flux       PL   2.27e-01  2.31e-01  1.65e-01  1.88e-01  6.97e-01  8.12e-01   ph/cm2/s
      90%_error_low -6.78e-02 -4.65e-02 -4.00e-02 -7.72e-02 -1.34e-01 -1.57e-01   ph/cm2/s
      90%_error_hi   7.32e-02  4.60e-02  3.97e-02  1.04e-01  1.34e-01  1.59e-01   ph/cm2/s
 
Fluence        CPL   8.45e-08  1.53e-07  1.50e-07  8.36e-08  4.42e-07  4.72e-07   erg/cm2
      90%_error_low -1.33e-08 -1.69e-08 -2.67e-08 -5.26e-08 -5.59e-08 -7.77e-08   erg/cm2
      90%_error_hi   1.33e-08  1.75e-08  2.51e-08  1.43e-07  5.88e-08  1.50e-07   erg/cm2
Peak flux      CPL   1.86e-01  2.61e-01  1.78e-01  5.68e-02  6.67e-01  6.81e-01   ph/cm2/s
      90%_error_low -8.25e-02 -5.86e-02 -4.74e-02 -5.68e-02 -1.40e-01 -1.50e-01   ph/cm2/s
      90%_error_hi   8.69e-02  6.30e-02  4.79e-02  1.64e-01  1.39e-01  1.96e-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
   20.4669   -12.9538   0.0111    27.7905    20.7818         0.8745436     17.229 TRIG_00154112                 
 
Foreground time interval of the image:
 -6.816  15.840 (delta_t =  22.656 [sec])
Background time interval of the image:
-299.104  -6.816 (delta_t = 292.288 [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   -6.816 sec. to   15.840 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.83264     ( -0.159634   0.154318 )
Norm@50keV  : 2.31804E-03    ( -0.000241785   0.000238221 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.75 using 59 PHA bins.
# Reduced chi-squared =         0.9606 for     57 degrees of freedom 
# Null hypothesis probability =   5.598560e-01
 
Photon flux (15-150 keV)    in 22.66 sec: 0.323571 ( -0.028785  0.028794 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.83193e-07 ( -5.03503e-08  5.11869e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -6.816 sec. to   15.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.936578     ( -0.688293   0.825125 )
Epeak [keV] : 50.4613      ( -9.61362 31.3111 )
Norm@50keV  : 7.51677E-03    ( -0.00441913   0.0148388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.60 using 59 PHA bins.
# Reduced chi-squared =         0.8856 for     56 degrees of freedom 
# Null hypothesis probability =   7.143657e-01
 
Photon flux (15-150 keV)    in 22.66 sec: 0.313306 ( -0.029738  0.029777 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.4209e-07 ( -5.59364e-08  5.88204e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.656 sec. to    2.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.48468     ( -0.316317   0.310829 )
Norm@50keV  : 5.60849E-03    ( -0.0011051   0.00109457 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.36 using 59 PHA bins.
# Reduced chi-squared =         0.9537 for     57 degrees of freedom 
# Null hypothesis probability =   5.746558e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.697336 ( -0.133939  0.134172 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.3347e-08 ( -1.13479e-08  1.15523e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.656 sec. to    2.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.228703     ( -1.36428   2.0766 )
Epeak [keV] : 67.9212      ( -16.2523 -67.9211 )
Norm@50keV  : 2.51795E-02    ( -0.0251796   0.26041 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.11 using 59 PHA bins.
# Reduced chi-squared =         0.9305 for     56 degrees of freedom 
# Null hypothesis probability =   6.229793e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.667220 ( -0.139545  0.139234 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.8671e-08 ( -1.21897e-08  1.27264e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 18.284 sec.
Hardness ratio (energy fluence ratio) = 1.12305186222

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

    S(15-50 keV)  = 2.2943162e-07
S(50-150 keV) = 2.5377039e-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 = 4.927397904715308E-01, IMY = -1.869951146872751E-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:
-299.104000 -6.816000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.0351  38.2796   66.1  48.5  164.2   0.0837   0.2    6.9	Cyg X-2                       
345.5004  -6.6037    2.7  34.8   90.4   1.7864   4.3 ------	UNKNOWN                       
 14.7479 -32.7721    2.3  46.8   33.8   2.8199   5.2 ------	UNKNOWN                       
 36.2750 -34.2349    2.9  52.8   11.5   2.6042   4.0 ------	UNKNOWN                       
324.3529  50.9774    3.4  54.1  178.9   2.1064   3.4 ------	UNKNOWN

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

    Time interval of the image:
-6.816000 15.840000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.2186  38.4265    6.7  48.4  164.4   0.2029   1.7    6.7	Cyg X-2                       
346.9470 -14.9725    2.4  39.3   78.4   0.7820   4.7 ------	UNKNOWN                       
 25.0290 -36.2399    2.9  51.4   23.3   0.7993   4.0 ------	UNKNOWN                       
340.2874  27.9765    2.5  34.0  154.6   0.2820   4.7 ------	UNKNOWN                       
 20.4669 -12.9538    0.7  27.8   20.8   0.8745  17.2 ------	UNKNOWN                       
 60.7091 -20.0012    3.1  57.4  -19.7   0.7463   3.7 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
88.996600 127.091700
127.896000 302.966000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
359.7649   8.0873    2.5  29.5  125.4   0.9363   4.7  485.4	UNKNOWN                       
 52.8823  37.1839    3.5  58.7 -159.3   3.5145   3.3 ------	UNKNOWN                       
 62.3643  -7.1556    2.6  41.6 -103.1   2.9247   4.5 ------	UNKNOWN