GRB130812A: 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 23:54:06 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger566228
======================================================================

  Trigger: 00566228      Segment: 000

  BAT Trigger Time: 398038983.488   [s; MET]
      Trigger Stop: 398038983.744   [s; MET]
               UTC: 2013-08-12T22:22:52.584320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 92.4021902978214   Dec: -13.2953627403695  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.67
     Image Trigger?:     NO
     Rate S/N Ratio:     26.0959767013998  [ if not an image trigger ]
     Image S/N Ratio:    11.67

  Analysis Position:   [ source = BAT ]
    RA: 92.4021902978214   Dec: -13.2953627403695  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 92.387801045198   Dec: -13.285106785115  [deg; J2000]  
        { 06h 09m 33.1s , -13d 17' 06.4" }
         +/- 0.950776539636741 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.372340861877258 [arcmin] (formal 1-sigma fit error)
    SNR: 32.6915016570173
 
  Angular difference between the analysis and refined position is 1.041468 arcmin
 
  Partial Coding Fraction: 0.7578125    [ including projection effects ]

  Duration
     T90: 7.62799996137619 +/- 0.546494314734789
        Measured from: -0.0279999971389771
                   to: 7.59999996423721     [s; relative to TRIGTIME]
     T50: 5.60399997234344 +/- 0.226556830125041
        Measured from: 0.744000017642975
                   to: 6.34799998998642     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.139999985694885     
                   to: 0.860000014305115     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.331999957561493     
                   to: 8.46000003814697     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.545924   0.533905   0.177117   0.013938
           0.020462   0.020520   0.016739   0.013696 [error]
 Peak      0.137389   0.125425   0.042243   0.003491
           0.008114   0.007966   0.006145   0.004639 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    8.792   -0.332    8.460
T90     7.628   -0.028    7.600
T50     5.604    0.744    6.348
Peak    1.000   -0.140    0.860
 
 
====== 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: 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      -2.428    -0.109      0.105       -           -               -         7.26e-03     -5.20e-04          5.15e-04      93.660   57
CPL     -1.099    -0.539      0.612       26.509      -9.079         4.847      4.42e-02        N/A               N/A         72.580   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      -2.478     -0.161     0.153       -           -               -         1.48e-02     -1.68e-03          1.66e-03      55.150   57
CPL     -1.513     -0.468     0.910       18.503      N/A           N/A         5.89e-02        N/A               N/A         49.320   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   1.96e-07  2.06e-07  1.53e-07  1.84e-07  6.27e-07  7.40e-07   erg/cm2
      90%_error_low -1.43e-08 -1.08e-08 -1.50e-08 -3.30e-08 -3.54e-08 -5.29e-08   erg/cm2
      90%_error_hi   1.46e-08  1.08e-08  1.53e-08  3.76e-08  3.57e-08  5.57e-08   erg/cm2
Peak flux       PL   1.57e+00  8.93e-01  3.20e-01  1.51e-01  2.87e+00  2.94e+00   ph/cm2/s
      90%_error_low -1.61e-01 -7.06e-02 -4.70e-02 -3.76e-02 -2.21e-01 -2.24e-01   ph/cm2/s
      90%_error_hi   1.64e-01  7.03e-02  4.85e-02  4.49e-02  2.21e-01  2.24e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -1.43e-08 -1.08e-08 -1.50e-08 -3.30e-08 -3.54e-08 -5.29e-08   erg/cm2
      90%_error_hi   1.46e-08  1.08e-08  1.53e-08  3.76e-08  3.57e-08  5.57e-08   erg/cm2
Peak flux      CPL     N/A      N/A      N/A      N/A      N/A      N/A     ph/cm2/s
      90%_error_low -1.61e-01 -7.06e-02 -4.70e-02 -3.76e-02 -2.21e-01 -2.24e-01   ph/cm2/s
      90%_error_hi   1.64e-01  7.03e-02  4.85e-02  4.49e-02  2.21e-01  2.24e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   92.3878   -13.2851   0.0058    29.4378     9.2610         1.2914191     32.692 TRIG_00566228                 
 
Foreground time interval of the image:
 -0.332   8.460 (delta_t =   8.792 [sec])
Background time interval of the image:
-114.187  -0.332 (delta_t = 113.855 [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   -0.332 sec. to    8.460 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.42828     ( -0.108629   0.105006 )
Norm@50keV  : 7.25697E-03    ( -0.000519811   0.000515353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          93.66 using 59 PHA bins.
# Reduced chi-squared =          1.643 for     57 degrees of freedom 
# Null hypothesis probability =   1.589920e-03
 
Photon flux (15-150 keV)    in 8.792 sec: 1.36546 ( -0.07264  0.07279 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.26639e-07 ( -3.53803e-08  3.56805e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.332 sec. to    8.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09858     ( -0.539306   0.612248 )
Epeak [keV] : 26.5087      ( -9.08016 4.84564 )
Norm@50keV  : 4.41922E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.58 using 59 PHA bins.
# Reduced chi-squared =          1.296 for     56 degrees of freedom 
# Null hypothesis probability =   6.732149e-02
 
Photon flux (15-150 keV)    in 8.792 sec: 1.27961 ( -0.07849  0.07885 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.140 sec. to    0.860 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.47838     ( -0.160775   0.152616 )
Norm@50keV  : 1.47766E-02    ( -0.0016791   0.00166 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.15 using 59 PHA bins.
# Reduced chi-squared =         0.9675 for     57 degrees of freedom 
# Null hypothesis probability =   5.448078e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.86518 ( -0.22087  0.22102 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.46954e-07 ( -1.27517e-08  1.29318e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.140 sec. to    0.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51285     ( -0.468609   0.909466 )
Epeak [keV] : 18.5028      (   )
Norm@50keV  : 5.88915E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.32 using 59 PHA bins.
# Reduced chi-squared =         0.8807 for     56 degrees of freedom 
# Null hypothesis probability =   7.239044e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = 5.569857683129329E-01, IMY = -9.082077752527755E-02

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:
-114.187410 -0.332000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6293  22.0123    0.3   7.5  163.7   4.7507  40.6    0.3	Crab                          
 61.6577 -11.6405    2.2  38.0   62.9   1.8010   5.3 ------	UNKNOWN                       
115.8541 -24.5361    2.1  48.6  -16.6   1.2771   5.5 ------	UNKNOWN                       
124.2164  -8.4003    2.9  43.2  -40.7   0.9255   4.0 ------	UNKNOWN                       
130.3582 -23.2152    3.2  56.8  -29.8   2.6717   3.6 ------	UNKNOWN                       
129.8990  39.5891    2.7  43.4 -113.9   2.1836   4.3 ------	UNKNOWN                       

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

Time interval of the image:
-0.332000 8.460000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7866  22.0588   37.4   7.4  164.9   0.0093   0.3    8.9	Crab                          
 66.0652 -26.3134    2.4  47.3   45.0   0.7455   4.8 ------	UNKNOWN                       
 92.3878 -13.2851    0.3  29.4    9.3   1.2915  32.7 ------	UNKNOWN                       
 71.9299  68.4560    3.5  53.6 -169.6   0.2998   3.3 ------	UNKNOWN                       
116.9827  18.9988    2.5  27.7  -83.1   0.2207   4.6 ------	UNKNOWN                       
128.2305  53.2456    2.5  48.8 -131.5   0.6887   4.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
61.212590 962.533900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6309  22.0162    0.2  36.4 -166.1  37.3370  58.7    0.2	Crab                          
135.5393 -40.5648    3.0  46.4  -18.0   4.1766   3.9    0.8	Vela X-1                      
 54.3191  27.3029    3.2  54.9  165.7  11.5184   3.5 ------	UNKNOWN                       
 75.3511  17.5032    2.9  35.1  178.6   2.5326   4.0 ------	UNKNOWN                       
107.5464 -31.5097    2.8  22.9   -7.1   2.0144   4.1 ------	UNKNOWN                       
 72.1318  40.9608    3.3  57.4 -170.4   8.9477   3.5 ------	UNKNOWN                       
145.1528 -22.0702    2.5  50.8  -44.5  14.3165   4.7 ------	UNKNOWN                       
125.4660  11.6855    4.6  41.2  -98.1   7.7861   2.5 ------	UNKNOWN