GRB060804: 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: Wed Jan 22 14:37:38 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger222546
======================================================================

  Trigger: 00222546      Segment: 000

  BAT Trigger Time: 176369301.184   [s; MET]
      Trigger Stop: 176369309.376   [s; MET]
               UTC: 2006-08-04T07:28:19.825160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 112.201199296934   Dec: -27.2313754670281  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.92
     Image Trigger?:     NO
     Rate S/N Ratio:     10.816653826392  [ if not an image trigger ]
     Image S/N Ratio:    8.92

  Analysis Position:   [ source = BAT ]
    RA: 112.201199296934   Dec: -27.2313754670281  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 112.221032429631   Dec: -27.2282273464159  [deg; J2000]  
        { 07h 28m 53.0s , -27d 13' 41.6" }
         +/- 2.07292230462618 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.97175152518805 [arcmin] (formal 1-sigma fit error)
    SNR: 10.7363563153294
 
  Angular difference between the analysis and refined position is 1.074839 arcmin
 
  Partial Coding Fraction: 0.1894531    [ including projection effects ]

  Duration
     T90: 18.188000023365 +/- 2.65723162056136
        Measured from: -12.9519999921322
                   to: 5.23600003123283     [s; relative to TRIGTIME]
     T50: 11.3400000035763 +/- 5.37857420360907
        Measured from: -8.13999998569489
                   to: 3.20000001788139     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.5160000026226     
                   to: 5.5160000026226     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -14.0599999725819     
                   to: 5.54800000786781     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.280744   0.402184   0.180068   0.094338
           0.046986   0.049801   0.043516   0.038509 [error]
 Peak      0.036120   0.043100   0.045042   0.027139
           0.011348   0.011563   0.010762   0.008650 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   19.608  -14.060    5.548
T90    18.188  -12.952    5.236
T50    11.340   -8.140    3.200
Peak    1.000    4.516    5.516
 
 
====== 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      -1.783    -0.273      0.261       -           -               -         2.95e-03     -5.26e-04          5.15e-04      83.780   57
CPL     -0.159    -1.861      3.365       43.583      -9.373       -43.583      2.86e-02     -2.86e-02          3.66e+00      81.790   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      -1.447     -0.485     0.481       -           -               -         9.30e-03     -2.26e-03          2.23e-03      58.110   57
CPL     -1.470     -0.463     0.731     9999.350    -9999.350      -9999.350      9.30e-03     -2.23e-03          1.10e-02      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   9.64e-08  1.49e-07  1.73e-07  3.88e-07  5.33e-07  8.06e-07   erg/cm2
      90%_error_low -2.13e-08 -2.30e-08 -4.04e-08 -1.54e-07 -9.57e-08 -2.03e-07   erg/cm2
      90%_error_hi   2.20e-08  2.30e-08  4.11e-08  2.11e-07  9.79e-08  2.47e-07   erg/cm2
Peak flux       PL   3.64e-01  3.78e-01  2.77e-01  3.27e-01  1.14e+00  1.35e+00   ph/cm2/s
      90%_error_low -1.59e-01 -1.07e-01 -8.72e-02 -1.77e-01 -2.86e-01 -3.23e-01   ph/cm2/s
      90%_error_hi   1.81e-01  1.00e-01  8.16e-02  2.69e-01  2.86e-01  3.26e-01   ph/cm2/s
 
Fluence        CPL   8.82e-08  1.81e-07  1.42e-07  3.10e-08  4.37e-07  4.44e-07   erg/cm2
      90%_error_low -2.58e-08 -4.34e-08 -7.87e-08    N/A    -1.07e-07 -1.15e-07   erg/cm2
      90%_error_hi   2.48e-08  4.43e-08  6.41e-08    N/A     1.50e-07  4.31e-07   erg/cm2
Peak flux      CPL   3.64e-01  3.78e-01  2.71e-01  3.34e-01  1.17e+00  1.33e+00   ph/cm2/s
      90%_error_low -1.60e-01 -1.10e-01 -8.44e-02     N/A   -3.07e-01 -3.09e-01   ph/cm2/s
      90%_error_hi   1.81e-01  1.04e-01  8.98e-02     N/A    2.68e-01  3.36e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  112.2210   -27.2282   0.0179    36.8587   -95.7660         1.0635654     10.736 TRIG_00222546                 
 
Foreground time interval of the image:
-14.060   5.548 (delta_t =  19.608 [sec])
Background time interval of the image:
-239.184 -14.060 (delta_t = 225.124 [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  -14.060 sec. to    5.548 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.78325     ( -0.272508   0.261404 )
Norm@50keV  : 2.94996E-03    ( -0.000526281   0.000514602 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          83.78 using 59 PHA bins.
# Reduced chi-squared =          1.470 for     57 degrees of freedom 
# Null hypothesis probability =   1.199791e-02
 
Photon flux (15-150 keV)    in 19.61 sec: 0.403910 ( -0.06264  0.062669 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.32988e-07 ( -9.56597e-08  9.78931e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -14.060 sec. to    5.548 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.158784     ( -1.88079   3.34509 )
Epeak [keV] : 43.5832      ( -9.18317 -43.3934 )
Norm@50keV  : 2.85622E-02    ( -0.0305687   3.65817 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.79 using 59 PHA bins.
# Reduced chi-squared =          1.460 for     56 degrees of freedom 
# Null hypothesis probability =   1.390034e-02
 
Photon flux (15-150 keV)    in 19.61 sec: 0.382182 ( -0.068219  0.06875 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.36523e-07 ( -1.07097e-07  1.4995e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    4.516 sec. to    5.516 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.44713     ( -0.485558   0.480431 )
Norm@50keV  : 9.29589E-03    ( -0.00225614   0.00222659 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.11 using 59 PHA bins.
# Reduced chi-squared =          1.020 for     57 degrees of freedom 
# Null hypothesis probability =   4.340790e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.14478 ( -0.285757  0.28618 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.90164e-08 ( -2.36913e-08  2.37683e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.516 sec. to    5.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.47029     ( -0.464583   0.729767 )
Epeak [keV] : 9999.35      ( -9999.36 -9999.36 )
Norm@50keV  : 9.29888E-03    ( -0.00223654   0.0109629 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.13 using 59 PHA bins.
# Reduced chi-squared =          1.038 for     56 degrees of freedom 
# Null hypothesis probability =   3.967386e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.16770 ( -0.306825  0.26753 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.22824e-08 ( -3.09307e-08  2.41133e-08 ) 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 = -7.531924975437265E-02, IMY = 7.459008555131527E-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:
-239.184000 -14.060000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6881 -40.4183    0.0  32.4  -54.6  -0.4311  -1.9   10.9	Vela X-1                      
170.4084 -60.4332    0.0  33.9    0.2   0.3408   1.6   11.7	Cen X-3                       
186.6436 -62.7760    1.1  38.4   11.5   2.3527  10.7    0.5	GX 301-2                      
 54.3004 -15.6778    2.7  54.9 -171.9   2.1736   4.3 ------	UNKNOWN                       
 85.9710 -29.8548    3.0  33.1 -136.3   0.7500   3.9 ------	UNKNOWN                       
152.4980 -36.5119    2.4  43.1  -40.5   1.3850   4.8 ------	UNKNOWN                       

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

Time interval of the image:
-14.060000 5.548000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6881 -40.4183    0.0  32.4  -54.6  -0.0646  -1.2   10.9	Vela X-1                      
170.5673 -60.6862   10.1  33.8    0.7   0.0577   1.1    8.3	Cen X-3                       
186.5932 -62.8166    3.2  38.4   11.5  -0.2213  -3.6    3.3	GX 301-2                      
 27.8413 -52.9671    2.0  35.5  132.2   0.4174   5.7 ------	UNKNOWN                       
 34.9574 -24.9921    2.5  54.4  163.1   1.0966   4.6 ------	UNKNOWN                       
 84.3353 -32.3936    2.5  30.8 -139.6   0.2204   4.7 ------	UNKNOWN                       
142.7621 -39.4300    2.3  36.3  -47.7   0.3181   5.1 ------	UNKNOWN                       
129.5661 -33.7468    1.9  35.8  -68.2   0.4316   6.0 ------	UNKNOWN                       
112.2210 -27.2282    1.1  36.9  -95.8   1.0636  10.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
105.516600 711.416610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6416  22.0186    0.9  56.5 -150.3  21.5909  12.9    0.5	Crab                          
135.6699 -40.7234    0.0  23.5   12.8  -0.3282  -1.2   12.0	Vela X-1                      
170.2851 -60.6064   25.4  51.0   29.4   0.6159   0.5    1.3	Cen X-3                       
 93.6211 -57.9409    3.6  33.4   79.8   1.7703   3.3 ------	UNKNOWN                       
 58.7458 -16.3769    3.3  50.4  152.6   4.9513   3.5 ------	UNKNOWN                       
179.0344 -42.3055    2.4  55.5    6.2   6.4424   4.9 ------	UNKNOWN                       
168.6260 -43.1820    2.3  47.8    6.7   2.8469   5.0 ------	UNKNOWN