batgrbproduct Analysis for Trigger=151131

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Tue Jan  8 16:50:41 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger151131/SDC
======================================================================

  Trigger: 00151131      Segment: 000

  BAT Trigger Time: 146161434.816   [s; MET]
      Trigger Stop: 146161461.696   [s; MET]
               UTC: 2005-08-19T16:23:55.132880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 358.735497383504   Dec: 24.8535340564834  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.79
     Image Trigger?:     NO
     Rate S/N Ratio:     9.9498743710662  [ if not an image trigger ]
     Image S/N Ratio:    8.79

  Flight Position:   [ source = BAT ]
    RA: 358.735497383504   Dec: 24.8535340564834  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 358.755893897853   Dec: 24.873397079742  [deg; J2000]  
        { 23h 55m 01.4s , +24d 52' 24.2" }
         +/- 2.04602395275097 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.892088445137981 [arcmin] (formal 1-sigma fit error)
    SNR: 10.938561618401
    RA  =  23h 55m  1.4s  (358.755894 deg.)
    Dec =  24d 52' 24" (24.873397 deg.)
 
  Angular difference between Flight and Ground position is 1.628878 arcmin
 
  Partial Coding Fraction: 0.765625    [ including projection effects ]

  Duration
     T90: 48 +/- 22.6274169979695
        Measured from: -11.8160000145435
                   to: 36.1839999854565     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: 4.18399998545647
                   to: 20.1839999854565     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 11.6839999854565     
                   to: 12.6839999854565     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.8160000145435     
                   to: 36.1839999854565     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.394056   0.319552   0.049791   0.021677
           0.034801   0.035091   0.030000   0.025264 [error]
 Peak      0.166671   0.141425   0.020550   0.025493
           0.020050   0.020425   0.017308   0.014639 [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 1.31e-07 1.17e-07 7.28e-08 6.87e-08 3.50e-07 3.89e-07   erg/cm2
              Error 1.95e-08 1.81e-08 2.31e-08 4.01e-08 5.55e-08 7.73e-08   erg/cm2
Peak flux Power-law 1.18e-01 5.86e-02 1.80e-02 7.01e-03 1.98e-01 2.01e-01   ph/cm2/s
              Error 2.27e-02 1.16e-02 7.50e-03 5.27e-03 3.18e-02 3.27e-02   ph/cm2/s
 
Fluence   Cutoff-PL 1.25e-07 1.34e-07 4.97e-08 4.69e-09 3.13e-07 3.14e-07   erg/cm2
              Error 2.13e-08 2.41e-08 2.99e-08 2.22e-08 5.38e-08 5.86e-08   erg/cm2
Peak flux Cutoff-PL 1.13e-01 6.54e-02 1.43e-02 1.14e-03 1.94e-01 1.94e-01   ph/cm2/s
              Error 2.46e-02 1.57e-02 9.47e-03 5.69e-03 3.19e-02 3.22e-02   ph/cm2/s
 
Fluence        Band 1.24e-07 1.36e-07 4.57e-08 3.27e-09 3.08e-07 3.04e-07   erg/cm2
              Error 1.53e-08 1.30e-08 1.09e-08 2.63e-09 5.30e-08 4.84e-08   erg/cm2
Peak flux      Band 1.13e-01 6.53e-02 1.44e-02 1.18e-03 1.94e-01 1.94e-01   ph/cm2/s
              Error 1.84e-02 1.35e-02 7.68e-03 5.60e-03 2.37e-02 3.20e-02   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.689    0.296    -      -           6.87e-04 1.61e-04   50.083 57
CPL   1.089    1.430      19.0   13.9      7.73e-03 8.22e-02   46.126 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.706    0.401    -      -           8.84e-04 2.83e-04   45.596 57
CPL   1.968    0.000       1.4   13.9      2.73e-03 1.44e-01   44.442  0
 
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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   48.000  -11.816   36.184
T90    48.000  -11.816   36.184
T50    16.000    4.184   20.184
Peak    1.000   11.684   12.684

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  358.7559 +24.8734 0.0176   20.7 -114.0       0.7473    10.9  TRIG_00151131       
------------------------------------------
 
Foreground time interval of the image:
-11.816  36.184 (delta_t =  48.000 [sec])
Background time interval of the image:
-299.816 -11.816 (delta_t = 288.000 [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
Time interval is from  -11.816 sec. to   36.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.68950     ( -0.277994   0.313399 )
Norm@50keV  : 6.871948E-04    ( -1.597287E-04   1.624109E-04) )
------------------------------------------------------------
 Chi-Squared =      50.08321     using    59 PHA bins.
 Reduced chi-squared =     0.8786528     for     57 degrees of freedom
 Null hypothesis probability = 0.730
 
Photon flux (15-150 keV)    in 48.00 sec: 0.152394 ( -0.019003  0.019008 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.49775e-07 ( -5.42419e-08  5.68315e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -11.816 sec. to   36.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.08850     ( -1.95566   0.904276 )
Epeak [keV] : 18.9594      ( -18.9494 8.90897 )
Norm@50keV  : 7.734234E-03    ( -7.734234E-03   0.156615 )
------------------------------------------------------------
 Chi-Squared =      46.12643     using    59 PHA bins.
 Reduced chi-squared =     0.8236862     for     56 degrees of freedom
 Null hypothesis probability = 0.824
 
Photon flux (15-150 keV)    in 48.00 sec: 0.147402 ( -0.019091  0.019177 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.13314e-07 ( -4.94107e-08  5.81568e-08 ) ergs/cm2
 
Band function
Time interval is from  -11.816 sec. to   36.184 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.37126   ( -4.24243   0.670419 )
beta        : -9.36296    ( -0.637036   19.3630 )
Epeak [keV] : 17.2545      ( -21.3817 5.38385 )
Norm@50keV   : 4.650172E-03    ( -1.446706E-03   0.230035 )
------------------------------------------------------------
 Chi-Squared =      46.41854     using    59 PHA bins.
 Reduced chi-squared =     0.8439735     for     55 degrees of freedom
 Null hypothesis probability = 0.788
 
Photon flux (15-150 keV)    in 48.00 sec: 0.147397 ( -0.018148  0.019083 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.08085e-07 ( -4.53662e-08  6.06931e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    4.184 sec. to   20.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.70592     ( -0.366541   0.436391 )
Norm@50keV  : 8.843998E-04    ( -2.803098E-04   2.853117E-04) )
------------------------------------------------------------
 Chi-Squared =      45.59565     using    59 PHA bins.
 Reduced chi-squared =     0.7999236     for     57 degrees of freedom
 Null hypothesis probability = 0.861
 
Photon flux (15-150 keV)    in 16.00 sec: 0.198167 ( -0.031813  0.031838 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50888e-07 ( -3.10778e-08  3.31381e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    4.184 sec. to   20.184 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.96828     (     )
Epeak [keV] : 1.42897      ( -13.4169 14.4768 )
Norm@50keV  : 2.734342E-03    ( -5.555027E-03   0.283357 )
------------------------------------------------------------
 Chi-Squared =      44.44158     using    59 PHA bins.
 but latest trial  0.300284     gives Chi-Squared =  0.312305
 Reduced chi-squared =     0.7935997     for     56 degrees of freedom
 Null hypothesis probability = 0.867
 
Photon flux (15-150 keV)    in 16.00 sec: 0.193700 ( -0.031799  0.03209 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.38344e-07 ( -2.86858e-08  3.66896e-08 ) ergs/cm2
 
Band function
Time interval is from    4.184 sec. to   20.184 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.38965   ( -8.61035   2.36011 )
beta        : -9.23739    ( -0.762607   19.2374 )
Epeak [keV] : 17.2310      ( -17.1310 11.6206 )
Norm@50keV   : 5.826260E-03    ( -5.826259E-03   732909. )
------------------------------------------------------------
 Chi-Squared =      44.50096     using    59 PHA bins.
 Reduced chi-squared =     0.8091084     for     55 degrees of freedom
 Null hypothesis probability = 0.843
 
Photon flux (15-150 keV)    in 16.00 sec: 0.193809 ( -0.031286  0.016121 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50788e-07 ( -2.5908e-08  2.41619e-08 ) ergs/cm2
 
Plot creation:
Tue Jan  8 17:09:36 EST 2008