GRB130816A: Summary Image Light curves Spectra Distribution Others

Analysis Summary

Notes:

• 1) No attempt has been made to eliminate the non-significant decimal places.
• 2) This batgrbproduct analysis is done using the HEASARC data.
• 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sat Jan 11 23:49:49 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger566545
======================================================================

  Trigger: 00566545      Segment: 000

  BAT Trigger Time: 398310426.624   [s; MET]
      Trigger Stop: 398310427.648   [s; MET]
               UTC: 2013-08-16T01:46:55.708120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 197.167012694417   Dec: -58.9479813527746  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.35
     Image Trigger?:     NO
     Rate S/N Ratio:     12.8452325786651  [ if not an image trigger ]
     Image S/N Ratio:    9.35

  Analysis Position:   [ source = BAT ]
    RA: 197.167012694417   Dec: -58.9479813527746  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 197.092507986141   Dec: -58.9959761092675  [deg; J2000]  
        { 13h 08m 22.2s , -58d 59' 45.5" }
         +/- 2.59470454607613 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.25458471540651 [arcmin] (formal 1-sigma fit error)
    SNR: 7.79048003519999
 
  Angular difference between the analysis and refined position is 3.688103 arcmin
 
  Partial Coding Fraction: 0.3554688    [ including projection effects ]

  Duration
     T90: 29.9759999513626 +/- 1.35699668952184
        Measured from: -27.772000014782
                   to: 2.20399993658066     [s; relative to TRIGTIME]
     T50: 17.027999997139 +/- 14.6264964686467
        Measured from: -16.3120000362396
                   to: 0.715999960899353     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0360000133514404     
                   to: 0.96399998664856     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -28.055999994278     
                   to: 2.58399999141693     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.230650   0.317410   0.147434   0.012580
           0.047181   0.048327   0.041770   0.036674 [error]
 Peak      0.058786   0.080067   0.027130   0.006479
           0.009435   0.010099   0.008414   0.006598 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   30.640  -28.056    2.584
T90    29.976  -27.772    2.204
T50    17.028  -16.312    0.716
Peak    1.000   -0.036    0.964
 
 
====== 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      -1.861    -0.352      0.326       -           -               -         1.52e-03     -3.44e-04          3.31e-04      42.280   57
CPL     -1.519    -0.691      1.811       59.107      N/A           N/A         2.40e-03        N/A               N/A         42.080   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      -2.038     -0.290     0.265       -           -               -         1.02e-02     -2.08e-03          2.03e-03      53.290   57
CPL     -0.024     -1.467     1.950       39.987      -9.689        10.967      1.53e-01     -1.53e-01          1.98e+00      47.410   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   8.33e-08  1.23e-07  1.35e-07  2.80e-07  4.27e-07  6.22e-07   erg/cm2
      90%_error_low -2.16e-08 -2.27e-08 -4.04e-08 -1.37e-07 -9.39e-08 -1.88e-07   erg/cm2
      90%_error_hi   2.24e-08  2.26e-08  4.15e-08  2.05e-07  9.69e-08  2.40e-07   erg/cm2
Peak flux       PL   7.02e-01  5.15e-01  2.51e-01  1.73e-01  1.55e+00  1.64e+00   ph/cm2/s
      90%_error_low -1.47e-01 -8.27e-02 -6.46e-02 -7.14e-02 -2.47e-01 -2.64e-01   ph/cm2/s
      90%_error_hi   1.52e-01  8.26e-02  6.63e-02  9.48e-02  2.47e-01  2.65e-01   ph/cm2/s
 
Fluence        CPL   8.40e-08  1.14e-07  1.19e-07  2.75e-07  3.92e-07  5.85e-07   erg/cm2
      90%_error_low -2.70e-08 -3.77e-08 -3.80e-08 -2.64e-07 -3.54e-07 -2.80e-07   erg/cm2
      90%_error_hi   2.29e-08  2.90e-08  2.69e-08  1.38e-07  9.18e-08  1.54e-07   erg/cm2
Peak flux      CPL   5.89e-01  6.45e-01  2.38e-01  2.16e-02  1.49e+00  1.49e+00   ph/cm2/s
      90%_error_low -1.76e-01 -1.23e-01 -8.53e-02 -2.16e-02 -2.47e-01 -2.49e-01   ph/cm2/s
      90%_error_hi   1.77e-01  1.27e-01  8.30e-02  7.12e-02  2.49e-01  2.52e-01   ph/cm2/s
 
======================================================================

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  197.0925   -58.9960   0.0247    31.9036    56.9179         0.7316770      7.790 TRIG_00566545                 
 
Foreground time interval of the image:
-28.056   2.584 (delta_t =  30.640 [sec])
Background time interval of the image:
-173.123 -28.056 (delta_t = 145.067 [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

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

Spectra

Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from  -28.056 sec. to    2.584 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.86083     ( -0.352225   0.326303 )
Norm@50keV  : 1.51609E-03    ( -0.000344144   0.000331347 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.28 using 59 PHA bins.
# Reduced chi-squared =         0.7418 for     57 degrees of freedom 
# Null hypothesis probability =   9.271984e-01
 
Photon flux (15-150 keV)    in 30.64 sec: 0.214059 ( -0.039436  0.039444 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.27149e-07 ( -9.3862e-08  9.6872e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -28.056 sec. to    2.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51895     ( -0.690717   1.81136 )
Epeak [keV] : 59.1067      (   )
Norm@50keV  : 2.39508E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.08 using 59 PHA bins.
# Reduced chi-squared =         0.7515 for     56 degrees of freedom 
# Null hypothesis probability =   9.160277e-01
 
Photon flux (15-150 keV)    in 30.64 sec: 0.211669 ( -0.040605  0.040396 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.91598e-07 ( -3.5444e-07  9.18158e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.036 sec. to    0.964 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.03768     ( -0.290397   0.264669 )
Norm@50keV  : 1.01512E-02    ( -0.00208255   0.00202655 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.29 using 59 PHA bins.
# Reduced chi-squared =         0.9349 for     57 degrees of freedom 
# Null hypothesis probability =   6.151634e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.54978 ( -0.24704  0.24707 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.38426e-08 ( -1.76715e-08  1.8127e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.036 sec. to    0.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.0244392     ( -1.4704   1.94673 )
Epeak [keV] : 39.9875      ( -9.69253 10.963 )
Norm@50keV  : 0.152997    ( -0.15394   1.98104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.41 using 59 PHA bins.
# Reduced chi-squared =         0.8467 for     56 degrees of freedom 
# Null hypothesis probability =   7.861516e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.49146 ( -0.24731  0.2486 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.32741e-08 ( -1.59501e-08  1.79677e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 29.976 sec.
Hardness ratio (energy fluence ratio) = 1.10131178262

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

S(15-50 keV)  = 2.062671e-07
S(50-150 keV) = 2.2087814e-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 = 3.398025988801988E-01, IMY = -5.216129614581994E-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:
-173.123400 -28.056000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3921 -40.6430    4.1  16.0  176.7   0.3614   2.8    8.2	Vela X-1                      
170.2382 -60.7338    3.8  22.6   78.6   0.4728   3.1    7.0	Cen X-3                       
186.6366 -62.8398   14.5  29.2   68.3   0.1728   0.8    4.2	GX 301-2                      
218.9505 -46.1651    2.7  45.0   36.0   1.5587   4.2 ------	UNKNOWN                       
201.4108 -42.9886    2.2  33.5   26.8   0.9031   5.2 ------	UNKNOWN                       
217.0647 -21.3700    2.4  54.3    5.5   2.4602   4.8 ------	UNKNOWN                       
103.9059 -37.1720    2.3  40.6  172.8   1.0130   5.0 ------	UNKNOWN                       
170.1121 -19.7567    2.5  23.3  -49.2   0.6094   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-28.056000 2.584000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7474 -40.4302    0.0  15.8  177.6   0.0724   1.3   12.5	Vela X-1                      
170.5005 -60.7506   15.9  22.7   78.4  -0.0542  -0.7    9.4	Cen X-3                       
186.4147 -62.6665    6.4  29.0   68.1   0.1759   1.8    9.1	GX 301-2                      
197.0925 -58.9960    1.5  31.9   56.9   0.7315   7.8 ------	UNKNOWN                       
120.0820 -49.9102    2.0  27.3  152.6   0.4003   5.8 ------	UNKNOWN                       
126.2284 -46.8593    2.1  22.9  158.5   0.3234   5.4 ------	UNKNOWN                       
168.4530 -42.7892    2.1   9.5   28.4   0.2934   5.5 ------	UNKNOWN                       
130.3905 -35.5095    2.1  20.9 -170.0   0.3108   5.6 ------	UNKNOWN                       
108.9797 -19.7803    2.3  45.1 -161.5   0.4556   5.0 ------	UNKNOWN                       
181.3620   2.8403    2.3  48.4  -49.3   1.2053   5.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
71.676590 962.391500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6399 -40.5476    4.3  41.9 -132.1   2.7684   2.7    5.1	Vela X-1                      
170.3036 -60.6061    1.4  13.5 -148.6   3.7007   8.4    1.1	Cen X-3                       
186.7711 -62.7819    1.5   6.3 -171.9   3.5075   7.7    3.2	GX 301-2                      
255.7849 -37.7071   24.8  42.6   46.9   0.6127   0.5   12.6	4U 1700-377                   
256.5922 -36.4384    5.6  44.0   46.4   2.8799   2.1    7.6	GX 349+2                      
214.4944 -35.4575    3.1  26.1   -6.4   1.7838   3.7 ------	UNKNOWN                       
219.0863 -27.3205    2.8  35.1   -4.7   2.3962   4.1 ------	UNKNOWN                       
201.4250 -42.9310    2.3  16.2  -28.7   2.2406   5.1 ------	UNKNOWN                       
193.6641  -8.2507    3.9  50.7  -44.4   8.0538   3.0 ------	UNKNOWN                       
169.2766 -22.9333    2.9  41.1  -80.9   8.9605   4.0 ------	UNKNOWN