Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 07:17:34 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger511866
======================================================================

  Trigger: 00511866      Segment: 000

  BAT Trigger Time: 348429995.84   [s; MET]
      Trigger Stop: 348429996.864   [s; MET]
               UTC: 2012-01-16T18:06:28.050200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 16.2483801033247   Dec: 33.9290006973161  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.37
     Image Trigger?:     NO
     Rate S/N Ratio:     55.1996376799703  [ if not an image trigger ]
     Image S/N Ratio:    20.37

  Analysis Position:   [ source = BAT ]
    RA: 16.2483801033247   Dec: 33.9290006973161  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 16.2452379952306   Dec: 33.9255166544431  [deg; J2000]  
        { 01h 04m 58.9s , +33d 55' 31.9" }
         +/- 0.698914461974269 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.276368081894224 [arcmin] (formal 1-sigma fit error)
    SNR: 50.7422557581114
 
  Angular difference between the analysis and refined position is 0.261092 arcmin
 
  Partial Coding Fraction: 0.859375    [ including projection effects ]

  Duration
     T90: 38.0439999103546 +/- 4.14843248426438
        Measured from: -17.9439999461174
                   to: 20.0999999642372     [s; relative to TRIGTIME]
     T50: 11.3719999194145 +/- 0.524381562442205
        Measured from: 0.380000054836273
                   to: 11.7519999742508     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0     
                   to: 1     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -33.4399999976158     
                   to: 26.5680000185966     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.126898   2.748997   0.717932   0.097238
           0.052936   0.053150   0.043305   0.037203 [error]
 Peak      0.188529   0.182379   0.064593   0.008013
           0.008622   0.009048   0.006615   0.004943 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   60.008  -33.440   26.568
T90    38.044  -17.944   20.100
T50    11.372    0.380   11.752
Peak    1.000    0.000    1.000
 
 
====== 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: CPL)
 
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      -2.695    -0.071      0.070       -           -               -         5.09e-03     -2.17e-04          2.16e-04     101.880   57
CPL     -1.310    -0.392      0.431       19.400      -7.815         4.790      3.27e-02     -1.34e-02          2.59e-02      56.080   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      -2.354     -0.118     0.114       -           -               -         2.27e-02     -1.84e-03          1.82e-03      51.050   57
CPL     -1.043     -0.590     0.677       28.978      -9.466         5.109      1.35e-01        N/A               N/A         34.350   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   1.22e-06  1.09e-06  6.73e-07  6.33e-07  3.25e-06  3.61e-06   erg/cm2
      90%_error_low -6.05e-08 -3.43e-08 -4.01e-08 -7.24e-08 -1.03e-07 -1.28e-07   erg/cm2
      90%_error_hi   6.14e-08  3.43e-08  4.06e-08  7.88e-08  1.03e-07  1.31e-07   erg/cm2
Peak flux       PL   2.13e+00  1.30e+00  5.09e-01  2.67e-01  4.08e+00  4.21e+00   ph/cm2/s
      90%_error_low -1.80e-01 -7.96e-02 -5.38e-02 -4.93e-02 -2.53e-01 -2.57e-01   ph/cm2/s
      90%_error_hi   1.83e-01  7.95e-02  5.45e-02  5.57e-02  2.53e-01  2.57e-01   ph/cm2/s
 
Fluence        CPL   1.04e-06  1.20e-06  5.68e-07  9.49e-08  2.88e-06  2.90e-06   erg/cm2
      90%_error_low -7.42e-08 -4.41e-08 -5.59e-08 -3.68e-08 -1.26e-07 -1.33e-07   erg/cm2
      90%_error_hi   7.51e-08  4.44e-08  5.50e-08  5.63e-08  1.29e-07  1.42e-07   erg/cm2
Peak flux      CPL   1.89e+00  1.49e+00  4.75e-01  5.79e-02  3.90e+00  3.91e+00   ph/cm2/s
      90%_error_low -2.09e-01 -1.12e-01 -7.02e-02 -3.04e-02 -2.63e-01 -2.66e-01   ph/cm2/s
      90%_error_hi   2.11e-01  1.14e-01  6.72e-02  5.34e-02  2.64e-01  2.68e-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
   16.2452    33.9255   0.0038    28.6021  -158.4353         5.1934054     50.742 TRIG_00511866                 
 
Foreground time interval of the image:
-33.440  12.061 (delta_t =  45.501 [sec])
Background time interval of the image:
-239.840 -33.440 (delta_t = 206.400 [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  -33.440 sec. to   26.568 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.69478     ( -0.0709923   0.069818 )
Norm@50keV  : 5.09150E-03    ( -0.000217147   0.000216117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         101.88 using 59 PHA bins.
# Reduced chi-squared =         1.7874 for     57 degrees of freedom 
# Null hypothesis probability =   2.403709e-04
 
Photon flux (15-150 keV)    in 60.01 sec: 1.13262 ( -0.04079  0.04105 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.24536e-06 ( -1.02804e-07  1.0293e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -33.440 sec. to   26.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.31013     ( -0.392354   0.430507 )
Epeak [keV] : 19.4000      ( -7.81523 4.78919 )
Norm@50keV  : 3.26550E-02    ( -0.0133526   0.0258606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.08 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     56 degrees of freedom 
# Null hypothesis probability =   4.720185e-01
 
Photon flux (15-150 keV)    in 60.01 sec: 1.02936 ( -0.047413  0.04783 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.88339e-06 ( -1.25903e-07  1.28877e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    0.000 sec. to    1.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.35426     ( -0.118344   0.113651 )
Norm@50keV  : 2.26582E-02    ( -0.0018425   0.00182101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.05 using 59 PHA bins.
# Reduced chi-squared =         0.8956 for     57 degrees of freedom 
# Null hypothesis probability =   6.966815e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.08330 ( -0.25306  0.25333 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18887e-07 ( -1.46897e-08  1.48029e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.000 sec. to    1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.04341     ( -0.589639   0.677103 )
Epeak [keV] : 28.9783      ( -9.46651 5.10873 )
Norm@50keV  : 0.134901    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          34.35 using 59 PHA bins.
# Reduced chi-squared =         0.6134 for     56 degrees of freedom 
# Null hypothesis probability =   9.900016e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.90261 ( -0.26261  0.26355 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 38.044 sec.
Hardness ratio (energy fluence ratio) = 0.474777300214

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

    S(15-50 keV)  = 2.235041e-06
S(50-150 keV) = 6.4835727e-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 = -5.070993270864460E-01, IMY = 2.004134497757264E-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:
-239.840000 -33.440000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
133.0210  59.3430    2.3  46.4   46.0   3.9902   5.0 ------	UNKNOWN                       
121.9537  69.7000    2.6  35.8   39.7   1.3611   4.5 ------	UNKNOWN                       
183.4248  61.9039    2.6  55.1   16.5   4.7183   4.5 ------	UNKNOWN                       
 12.9522  72.5493    2.6  11.9  -16.4   0.7054   4.4 ------	UNKNOWN

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

    Time interval of the image:
-33.440000 12.060600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 69.4811  57.7168    2.4  21.6   84.8   0.5486   4.8 ------	UNKNOWN                       
 27.6270  44.4197    2.0  17.4 -179.1   0.5017   5.7 ------	UNKNOWN                       
 16.2452  33.9255    0.2  28.6 -158.4   5.1926  50.7 ------	UNKNOWN                       
299.7806  51.2572    2.2  45.3  -58.1   2.0625   5.1 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
63.260600 919.460600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.2314  41.0291   36.0  53.1  -37.1   1.0335   0.3    7.2	Cyg X-3                       
326.0410  38.2349   11.7  40.3  -44.9   0.9727   1.0    8.1	Cyg X-2                       
 31.4475  15.8402    3.2  22.7  163.2   1.9159   3.6 ------	UNKNOWN                       
  1.9866 -13.9215    4.4  49.8 -137.8   6.2170   2.6 ------	UNKNOWN