GRB050406

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 22:31:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger113872
======================================================================

  Trigger: 00113872      Segment: 000

  BAT Trigger Time: 134495927.872   [s; MET]
      Trigger Stop: 134495929.92   [s; MET]
               UTC: 2005-04-06T15:58:48.407200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 34.4284384928714   Dec: -50.1778978956069  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8
     Image Trigger?:     NO
     Rate S/N Ratio:     9.48683298050514  [ if not an image trigger ]
     Image S/N Ratio:    8

  Analysis Position:   [ source = BAT ]
    RA: 34.4284384928714   Dec: -50.1778978956069  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 34.4170333024344   Dec: -50.181327992157  [deg; J2000]  
        { 02h 17m 40.1s , -50d 10' 52.8" }
         +/- 2.48753495928318 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.971760891788176 [arcmin] (formal 1-sigma fit error)
    SNR: 8.27434869107593
 
  Angular difference between the analysis and refined position is 0.484143 arcmin
 
  Partial Coding Fraction: 0.953125    [ including projection effects ]

  Duration
     T90: 5.77600002288818 +/- 1.39300683998906
        Measured from: -2.08000001311302
                   to: 3.69600000977516     [s; relative to TRIGTIME]
     T50: 2.23199999332428 +/- 1.38538804675014
        Measured from: -0.159999996423721
                   to: 2.07199999690056     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.19599997997284     
                   to: 2.19599997997284     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.50400000810623     
                   to: 3.89599999785423     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.080240   0.079122   0.010062   0.008930
           0.010812   0.011175   0.009492   0.008004 [error]
 Peak      0.022429   0.018200   0.002851   0.003143
           0.004452   0.004424   0.003737   0.003254 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    6.400   -2.504    3.896
T90     5.776   -2.080    3.696
T50     2.232   -0.160    2.072
Peak    1.000    1.196    2.196
 
 
====== 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      -2.403    -0.365      0.316       -           -               -         1.24e-03     -3.46e-04          3.48e-04      73.600   57
CPL      0.424    -1.770      2.996       29.373      -6.056         6.156      8.49e-02     -8.49e-02          7.80e+00      65.640   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      -2.458     -0.651     0.521       -           -               -         1.79e-03     -8.34e-04          8.73e-04      53.010   57
CPL      0.828     -2.883    -0.828       25.369     -25.369         9.057      3.70e-01     -3.70e-01          3.37e+06      49.870   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   2.39e-08  2.55e-08  1.93e-08  2.37e-08  7.77e-08  9.23e-08   erg/cm2
      90%_error_low -4.62e-09 -5.10e-09 -6.77e-09 -1.26e-08 -1.69e-08 -2.44e-08   erg/cm2
      90%_error_hi   4.66e-09  4.98e-09  7.60e-09  1.99e-08  1.79e-08  3.02e-08   erg/cm2
Peak flux       PL   1.86e-01  1.07e-01  3.89e-02  1.87e-02  3.42e-01  3.51e-01   ph/cm2/s
      90%_error_low -5.93e-02 -3.59e-02 -2.14e-02 -1.87e-02 -9.83e-02 -1.02e-01   ph/cm2/s
      90%_error_hi   6.02e-02  3.47e-02  2.64e-02  2.84e-02  9.88e-02  1.05e-01   ph/cm2/s
 
Fluence        CPL   2.21e-08  3.38e-08  1.07e-08  3.34e-10  6.70e-08  6.71e-08   erg/cm2
      90%_error_low -5.50e-09 -7.43e-09 -6.51e-09    N/A    -1.29e-08 -1.29e-08   erg/cm2
      90%_error_hi   5.30e-09  7.67e-09  9.41e-09    N/A     1.46e-08  1.48e-08   erg/cm2
Peak flux      CPL   1.89e-01  1.36e-01  1.02e-02  2.02e-05  3.35e-01  3.35e-01   ph/cm2/s
      90%_error_low -6.80e-02     N/A   -1.02e-02     N/A   -9.22e-02 -9.22e-02   ph/cm2/s
      90%_error_hi   6.90e-02     N/A    3.79e-02     N/A    9.33e-02  9.33e-02   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
   34.4170   -50.1813   0.0232    15.0594    33.8905         0.1729934      8.274 TRIG_00113872                 
 
Foreground time interval of the image:
 -2.504   3.896 (delta_t =   6.400 [sec])
Background time interval of the image:
-299.872  -2.504 (delta_t = 297.368 [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:

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   -2.504 sec. to    3.896 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.40285     ( -0.364618   0.316967 )
Norm@50keV  : 1.24363E-03    ( -0.000345836   0.0003488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.60 using 59 PHA bins.
# Reduced chi-squared =          1.291 for     57 degrees of freedom 
# Null hypothesis probability =   6.864064e-02
 
Photon flux (15-150 keV)    in 6.4 sec: 0.230504 ( -0.039349  0.039424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.76858e-08 ( -1.68513e-08  1.79235e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.504 sec. to    3.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.424057     ( -1.79331   2.97302 )
Epeak [keV] : 29.3726      ( -6.112 6.09983 )
Norm@50keV  : 8.48896E-02    ( -0.105401   7.77763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.64 using 59 PHA bins.
# Reduced chi-squared =          1.172 for     56 degrees of freedom 
# Null hypothesis probability =   1.772524e-01
 
Photon flux (15-150 keV)    in 6.4 sec: 0.224847 ( -0.037723  0.037979 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.70304e-08 ( -1.2864e-08  1.46372e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    1.196 sec. to    2.196 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.45752     ( -0.649458   0.52224 )
Norm@50keV  : 1.78545E-03    ( -0.000833327   0.000873598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.01 using 59 PHA bins.
# Reduced chi-squared =         0.9301 for     57 degrees of freedom 
# Null hypothesis probability =   6.253061e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.341837 ( -0.098294  0.098801 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.76555e-08 ( -6.29624e-09  7.06857e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.196 sec. to    2.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.08521     ( -2.92824   -0.872542 )
Epeak [keV] : 25.7262      ( -25.4187 9.00788 )
Norm@50keV  : 3.09049    ( -3.02745   3.37487e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.79 using 59 PHA bins.
# Reduced chi-squared =         0.8890 for     56 degrees of freedom 
# Null hypothesis probability =   7.077506e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.334891 ( -0.092244  0.09326 ) 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 = 2.233481792364259E-01, IMY = -1.500302450856418E-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:
-299.872000 -2.504000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 82.3545 -37.2513    2.6  50.4   16.5   2.0775   4.4 ------	UNKNOWN                       
349.2642  -2.1926    2.4  46.8 -127.7   3.0850   4.8 ------	UNKNOWN

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

Time interval of the image:
-2.504000 3.896000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 34.4170 -50.1813    1.4  15.1   33.9   0.1730   8.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
70.628610 302.179400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
313.3847 -35.3205    2.8  58.3 -176.8   3.5344   4.1 ------	UNKNOWN                       
 22.9539 -21.5017    2.9  30.1  -89.8   0.8176   4.0 ------	UNKNOWN                       
 72.0504  -0.6922    3.1  58.9  -22.6   3.6428   3.7 ------	UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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