Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jan 13 19:15:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger506074
======================================================================

  Trigger: 00506074      Segment: 000

  BAT Trigger Time: 340996392   [s; MET]
      Trigger Stop: 340996456   [s; MET]
               UTC: 2011-10-22T17:13:04.505940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 108.951202257144   Dec: 49.6663689387038  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.16
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    9.16

  Analysis Position:   [ source = BAT ]
    RA: 108.951202257144   Dec: 49.6663689387038  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 108.923306838468   Dec: 49.6597161970468  [deg; J2000]  
        { 07h 15m 41.6s , +49d 39' 35.0" }
         +/- 2.1076893429423 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.1283587391969 [arcmin] (formal 1-sigma fit error)
    SNR: 10.4842537444895
 
  Angular difference between the analysis and refined position is 1.154567 arcmin
 
  Partial Coding Fraction: 0.8203125    [ including projection effects ]

  Duration
     T90: 83.0279999375343 +/- 12.9672758719238
        Measured from: -29.444000005722
                   to: 53.5839999318123     [s; relative to TRIGTIME]
     T50: 43.9519999623299 +/- 16.1059065750694
        Measured from: -20.0120000243187
                   to: 23.9399999380112     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 49.5360000133514     
                   to: 50.5360000133514     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -47.8320000171661     
                   to: 60.1800000071526     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.468762   0.604276   0.346119   0.065331
           0.059516   0.061323   0.054053   0.046981 [error]
 Peak      0.016952   0.012083   0.013052   0.008370
           0.005859   0.005836   0.005457   0.004583 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  108.012  -47.832   60.180
T90    83.028  -29.444   53.584
T50    43.952  -20.012   23.940
Peak    1.000   49.536   50.536
 
 
====== 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      -1.649    -0.211      0.207       -           -               -         9.04e-04     -1.17e-04          1.15e-04      61.570   57
CPL     -1.520    -0.334      0.877      165.638    -165.638      -165.638      1.07e-03     -2.77e-04          2.26e-03      61.490   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      -1.102     -0.868     1.138       -           -               -         3.28e-03     -1.44e-03          1.15e-03      58.110   57
CPL     -1.127      1.127     0.569     9999.360      N/A           N/A         3.30e-03        N/A               N/A         58.130   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   1.42e-07  2.38e-07  3.03e-07  7.77e-07  8.98e-07  1.46e-06   erg/cm2
      90%_error_low -2.59e-08 -2.84e-08 -5.21e-08 -2.44e-07 -1.23e-07 -2.97e-07   erg/cm2
      90%_error_hi   2.67e-08  2.83e-08  5.23e-08  3.11e-07  1.25e-07  3.51e-07   erg/cm2
Peak flux       PL   9.18e-02  1.17e-01  1.10e-01  1.80e-01  3.80e-01  4.99e-01   ph/cm2/s
      90%_error_low -9.18e-02 -7.10e-02 -5.01e-02 -1.34e-01 -3.80e-01 -1.83e-01   ph/cm2/s
      90%_error_hi   9.65e-02  5.48e-02  4.30e-02  3.63e-01  1.44e-01  2.50e-01   ph/cm2/s
 
Fluence        CPL   1.40e-07  2.42e-07  3.04e-07  6.08e-07  8.85e-07  1.29e-06   erg/cm2
      90%_error_low -2.78e-08 -3.19e-08 -5.44e-08 -4.60e-07 -1.48e-07 -4.89e-07   erg/cm2
      90%_error_hi   2.77e-08  3.85e-08  5.37e-08  2.31e-07  1.35e-07  2.75e-07   erg/cm2
Peak flux      CPL   7.84e-02  5.16e-02  2.31e-02  1.72e-02  1.61e-01  1.71e-01   ph/cm2/s
      90%_error_low -7.84e-02 -5.16e-02 -2.31e-02 -1.72e-02     N/A       N/A     ph/cm2/s
      90%_error_hi   1.04e-01  7.23e-02  2.75e-02  2.89e-02     N/A       N/A     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
  108.9233    49.6597   0.0183    30.6897   -13.9694         1.5200058     10.484 TRIG_00506074                 
 
Foreground time interval of the image:
-47.832 -14.249 (delta_t =  33.583 [sec])
-13.000  60.180 (delta_t =  73.180 [sec])
Background time interval of the image:
-205.699 -47.832 (delta_t = 157.867 [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
    Multiple GTIs in the spectrum
tstart tstop
-47.832000 -14.248800
-13.000000 60.180000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.64852     ( -0.210702   0.206892 )
Norm@50keV  : 9.03853E-04    ( -0.000117039   0.000115271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.57 using 59 PHA bins.
# Reduced chi-squared =          1.080 for     57 degrees of freedom 
# Null hypothesis probability =   3.157672e-01
 
Photon flux (15-150 keV)    in 106.8 sec: 0.117968 ( -0.014025  0.014034 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.98051e-07 ( -1.22873e-07  1.24891e-07 ) ergs/cm2
    Cutoff power-law model
    Multiple GTIs in the spectrum
tstart tstop
-47.832000 -14.248800
-13.000000 60.180000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52044     ( -0.331816   0.879153 )
Epeak [keV] : 165.638      ( -168.314 -168.314 )
Norm@50keV  : 1.06695E-03    ( -0.000273562   0.00226694 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.49 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     56 degrees of freedom 
# Null hypothesis probability =   2.859024e-01
 
Photon flux (15-150 keV)    in 106.8 sec: 0.117433 ( -0.014384  0.014334 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.85158e-07 ( -1.47625e-07  1.34986e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   49.536 sec. to   50.536 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10165     ( -0.870091   1.13578 )
Norm@50keV  : 3.27518E-03    ( -0.00143824   0.00115349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.11 using 59 PHA bins.
# Reduced chi-squared =          1.019 for     57 degrees of freedom 
# Null hypothesis probability =   4.343542e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.379716 ( -0.379716  0.144199 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.42571e-08 ( -1.37474e-08  1.3735e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   49.536 sec. to   50.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.4503     ( 3.47771   2.92008 )
Epeak [keV] : 374.548      (   )
Norm@50keV  : 3.00009E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.26 using 59 PHA bins.
# Reduced chi-squared =          1.005 for     56 degrees of freedom 
# Null hypothesis probability =   4.651030e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.160653 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.40942e-08 ( 0  0 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 83.028 sec.
Hardness ratio (energy fluence ratio) = 1.27590989486

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

    S(15-50 keV)  = 3.795735e-07
S(50-150 keV) = 5.184793e-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 = 5.759592231643343E-01, IMY = 1.432760321747943E-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:
-205.699410 -47.832000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6292  22.0030    1.7  51.3   29.2   5.1426   6.9    0.7	Crab                          
308.0124  40.9824  325.4  58.0 -178.6  -0.0358  -0.0    4.8	Cyg X-3                       
326.3786  38.3944    3.8  55.3  164.5  -2.4865  -3.1   10.7	Cyg X-2                       
294.0733  43.4496    3.0  59.0 -166.2   3.7593   3.9 ------	UNKNOWN                       
140.8815  35.0265    3.3  53.9  -36.8   2.6783   3.6 ------	UNKNOWN

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

    Time interval of the image:
-47.832000 -14.248800
-13.000000 60.180000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.8265  22.0091    7.6  51.3   28.9  -1.0525  -1.5   10.8	Crab                          
308.2383  40.9926    3.5  57.9 -178.8  -2.5686  -3.3    6.3	Cyg X-3                       
326.2287  38.3080    6.5  55.4  164.6   1.3567   1.8    2.8	Cyg X-2                       
108.9237  49.6602    1.1  30.7  -14.0   1.5437  10.6 ------	UNKNOWN                       
278.5813  57.1374    2.9  48.6 -149.8   1.2287   3.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
126.300590 963.085500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6339  22.0123    0.3  34.1   44.0  32.6478  34.6    0.1	Crab                          
 38.7552  83.3155    3.8  38.5  168.8   2.4695   3.0 ------	UNKNOWN                       
252.5502  68.1748    3.2  59.1 -166.1  16.3021   3.6 ------	UNKNOWN                       
121.5539  -7.0415    3.8  57.8  -15.9   7.8226   3.0 ------	UNKNOWN                       
158.5962  55.9342    3.2  30.0 -122.4   2.3579   3.6 ------	UNKNOWN