batgrbproduct Analysis for Trigger=431605

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Sun Aug 15 00:37:44 EDT 2010
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger431605/GCN5_download_cron
======================================================================

  Trigger: 00431605      Segment: 000

  BAT Trigger Time: 303450617.344   [s; MET]
      Trigger Stop: 303450618.368   [s; MET]
               UTC: 2010-08-14T03:50:11.265420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 22.4806329492837   Dec: -17.9856336940265  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    19.15
     Image Trigger?:     NO
     Rate S/N Ratio:     57.28874234961  [ if not an image trigger ]
     Image S/N Ratio:    19.15

  Flight Position:   [ source = BAT ]
    RA: 22.4806329492837   Dec: -17.9856336940265  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 22.4790541795798   Dec: -17.9905039079663  [deg; J2000]  
        { 01h 29m 55.0s , -17d 59' 25.8" }
         +/- 0.545685186314971 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.157417337672946 [arcmin] (formal 1-sigma fit error)
    SNR: 72.2628836850687
 
  Angular difference between Flight and Ground position is 0.305787 arcmin
 
  Partial Coding Fraction: 0.90625    [ including projection effects ]

  Duration
     T90: 174.715999901295 +/- 9.46817490453253
        Measured from: -0.0399998426437378
                   to: 174.676000058651     [s; relative to TRIGTIME]
     T50: 97.1999999284744 +/- 5.8548663725284
        Measured from: 9.59600013494492
                   to: 106.796000063419     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0600000023841858     
                   to: 0.939999997615814     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.2039999961853     
                   to: 234.643999993801     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.789072   5.133240   4.164680   0.983477
           0.078148   0.080448   0.072592   0.063995 [error]
 Peak      0.038620   0.091831   0.148447   0.056136
           0.005835   0.006700   0.006999   0.005450 [error]

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

======================================================================
 
=== 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   Power-law 1.17e-06 2.19e-06 3.16e-06 9.65e-06 8.98e-06 1.62e-05   erg/cm2
              Error 5.28e-08 5.60e-08 7.92e-08 5.77e-07 1.95e-07 6.08e-07   erg/cm2
Peak flux Power-law 3.74e-01 6.54e-01 8.75e-01 2.40e+00 2.55e+00 4.30e+00   ph/cm2/s
              Error 5.43e-02 5.83e-02 5.12e-02 3.11e-01 1.55e-01 3.14e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.13e-06 2.21e-06 3.20e-06 7.93e-06 8.89e-06 1.45e-05   erg/cm2
              Error 7.12e-08 5.82e-08 9.03e-08 1.38e-06 2.12e-07 1.41e-06   erg/cm2
Peak flux Cutoff-PL 3.73e-01 3.15e-01 6.54e-01 9.32e-01 1.59e+00 2.51e+00   ph/cm2/s
              Error 6.23e-02 7.19e-02 2.77e-01 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
 
Fluence        Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.473    0.041    -      -           3.97e-03 8.32e-05   32.910 57
CPL   1.319    0.158     252.4  -74.9      4.64e-03 7.19e-04   30.390 56
 
The chi2 of BB fit is  which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.580    0.108    -      -           2.18e-02 1.44e-03   56.550 57
CPL   0.089    0.469     253.4 1275.2      3.37e-02 1.42e-02   52.990 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom
 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 147.200000 sec.
T50 in the 50-300 keV band: 68.992000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  237.848   -3.204  234.644
T90   174.716   -0.040  174.676
T50    97.200    9.596  106.796
Peak    1.000   -0.060    0.940

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   22.4791 -17.9905 0.0027   26.3  -12.4       4.7193    72.3  TRIG_00431605       
------------------------------------------
 
Foreground time interval of the image:
 -3.204  15.257 (delta_t =  18.461 [sec])
Background time interval of the image:
-239.344  -3.204 (delta_t = 236.140 [sec])

Lightcurves

Notes:

1 s binning

From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval

64 ms binning

Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Spectra

Notes:

Time averaged spectrum fit using the pre-slew DRM

Power-law model
Multiple GTIs in the spectrum
tstart tstop
-3.204000 219.926000
220.656000 234.644000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.47267     ( -0.0412734   0.0412543 )
Norm@50keV  : 3.97358E-03    ( -8.32234e-05   8.32132e-05 )
------------------------------------------------------------
# Chi-Squared =          32.91 using 59 PHA bins.
# Reduced chi-squared =         0.5773 for     57 degrees of freedom 
# Null hypothesis probability =   9.956343e-01
 
Photon flux (15-150 keV)    in 237.1 sec: 0.492503 ( -0.0118241  0.0118689 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.97895e-06 ( -1.95021e-07  1.95188e-07 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-3.204000 219.926000
220.656000 234.644000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31948     ( -0.170207   0.145815 )
Epeak [keV] : 252.370      ( -102.651 -252.37 )
Norm@50keV  : 4.64084E-03    ( -0.000590014   0.000848729 )
------------------------------------------------------------
# Chi-Squared =          30.39 using 59 PHA bins.
# Reduced chi-squared =         0.5426 for     56 degrees of freedom 
# Null hypothesis probability =   9.979515e-01
 
Photon flux (15-150 keV)    in 237.1 sec: 0.485955 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.89094e-06 ( -2.19483e-07  2.03859e-07 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
-3.204000 219.926000
220.656000 234.644000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.29686   ( 0.981343   5.33948 )
beta        : -1.61213    ( 1.61349   0.158175 )
Epeak [keV] : 221.298      ( -221.872 -221.872 )
Norm@50keV   : 4.75755E-03    ( -0.000620621   17.143 )
------------------------------------------------------------
# Chi-Squared =          30.32 using 59 PHA bins.
# Reduced chi-squared =         0.5513 for     55 degrees of freedom 
# Null hypothesis probability =   9.972385e-01
 
Photon flux (15-150 keV)    in 237.1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     

Peak spectrum fit

Power-law model
Time interval is from   -0.060 sec. to    0.940 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.580398     ( -0.109647   0.106115 )
Norm@50keV  : 2.17626E-02    ( -0.00145339   0.00143547 )
------------------------------------------------------------
# Chi-Squared =          56.55 using 59 PHA bins.
# Reduced chi-squared =         0.9921 for     57 degrees of freedom 
# Null hypothesis probability =   4.918287e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.54718 ( -0.154764  0.155022 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.80944e-07 ( -1.72505e-08  1.72733e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.060 sec. to    0.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 8.90985E-02     ( -0.505803   0.431694 )
Epeak [keV] : 253.352      ( -94.7148 2455.77 )
Norm@50keV  : 3.36903E-02    ( -0.0105458   0.0178284 )
------------------------------------------------------------
# Chi-Squared =          52.99 using 59 PHA bins.
# Reduced chi-squared =         0.9463 for     56 degrees of freedom 
# Null hypothesis probability =   5.894472e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.51004 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.78543e-07 ( -1.7832e-08  1.773e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.060 sec. to    0.940 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.982142   ( 0.982142   0.982142 )
beta        : -0.580411    ( -0.106033   0.109768 )
Epeak [keV] : 15.8455      ( -15.8455 -15.8455 )
Norm@50keV   : 2.98363E-02    ( -0.00947979   238061 )
------------------------------------------------------------
# Chi-Squared =          56.55 using 59 PHA bins.
# Reduced chi-squared =          1.028 for     55 degrees of freedom 
# Null hypothesis probability =   4.167946e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Single BB
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25     
25- 50     
50-150     
15-150     
Plot creation:
Sun Aug 15 01:03:39 EDT 2010