batgrbproduct Analysis for Trigger=164268

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Jan  9 18:50:59 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger164268/GCN5_download_hand
======================================================================

  Trigger: 00164268      Segment: 000

  BAT Trigger Time: 153917479.936   [s; MET]
      Trigger Stop: 153917484.032   [s; MET]
               UTC: 2005-11-17T10:51:20.091280    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 228.404931238687   Dec: 30.8698475591698  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.84
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6189500386223  [ if not an image trigger ]
     Image S/N Ratio:    12.84

  Flight Position:   [ source = BAT ]
    RA: 228.404931238687   Dec: 30.8698475591698  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 228.398813646606   Dec: 30.8661434467151  [deg; J2000]  
        { 15h 13m 35.7s , +30d 51' 58.1" }
         +/- 0.949485621720666 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.274648410304515 [arcmin] (formal 1-sigma fit error)
    SNR: 32.7550162534362
    RA  =  15h 13m 35.7s  (228.398814 deg.)
    Dec =  30d 51' 58" (30.866143 deg.)
 
  Angular difference between Flight and Ground position is 0.385562 arcmin
 
  Partial Coding Fraction: 0.7265625    [ including projection effects ]

  Duration
     T90: 136.340000003576 +/- 13.0823899991033
        Measured from: -10.5919999778271
                   to: 125.748000025749     [s; relative to TRIGTIME]
     T50: 56.3720000088215 +/- 3.74256224048285
        Measured from: 13.9399999976158
                   to: 70.3120000064373     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.61599999666214     
                   to: 3.61599999666214     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -28.7479999959469     
                   to: 148.356000006199     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.609425   2.883319   1.717195   0.292087
           0.070652   0.072126   0.064026   0.056670 [error]
 Peak      0.039692   0.045957   0.017657   0.004400
           0.006160   0.006325   0.005557   0.004718 [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 8.56e-07 1.27e-06 1.41e-06 2.96e-06 4.44e-06 6.51e-06   erg/cm2
              Error 5.61e-08 4.65e-08 6.85e-08 3.23e-07 1.58e-07 3.65e-07   erg/cm2
Peak flux Power-law 4.45e-01 3.12e-01 1.44e-01 9.31e-02 9.46e-01 9.94e-01   ph/cm2/s
              Error 9.97e-02 5.39e-02 4.36e-02 5.21e-02 1.60e-01 1.71e-01   ph/cm2/s
 
Fluence   Cutoff-PL 7.98e-07 1.30e-06 1.44e-06 1.88e-06 4.32e-06 5.43e-06   erg/cm2
              Error 7.35e-08 5.26e-08 7.33e-08 7.35e-07 1.90e-07 7.64e-07   erg/cm2
Peak flux Cutoff-PL 4.15e-01 3.55e-01 1.35e-01 2.28e-02 9.23e-01 9.27e-01   ph/cm2/s
              Error 1.10e-01 7.47e-02 5.71e-02 5.82e-02 1.61e-01 1.67e-01   ph/cm2/s
 
Fluence        Band 7.91e-07 1.30e-06 1.43e-06 1.88e-06 4.31e-06 5.57e-06   erg/cm2
              Error 7.28e-08 5.25e-08 7.32e-08 7.35e-07 1.90e-07 7.48e-07   erg/cm2
Peak flux      Band 4.15e-01 3.55e-01 1.35e-01 2.27e-02 9.23e-01 9.27e-01   ph/cm2/s
              Error 1.10e-01 5.58e-02 4.24e-02 5.71e-02 1.61e-01 1.67e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.849    0.070    -      -           2.73e-03 9.62e-05   47.607 57
CPL   1.475    0.300      71.6   71.5      4.13e-03 1.34e-03   43.706 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.114    0.319    -      -           5.97e-03 1.38e-03   47.164 57
CPL   1.038    1.500      34.8 5000.0      2.68e-02 2.12e-01   44.944  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: 127.872000 sec.
T50 in the 50-300 keV band: 54.400000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  177.104  -28.748  148.356
T90   136.340  -10.592  125.748
T50    56.372   13.940   70.312
Peak    1.000    2.616    3.616

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  228.3988 +30.8661 0.0059   29.2 -141.9       3.2149    32.8  TRIG_00164268       
------------------------------------------
 
Foreground time interval of the image:
-28.748  33.365 (delta_t =  62.113 [sec])
Background time interval of the image:
-299.936 -49.783 (delta_t = 250.153 [sec])
-48.936 -28.748 (delta_t =  20.188 [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  -28.748 sec. to  148.356 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.84866     ( -6.969988E-02   7.026219E-02) )
Norm@50keV  : 2.727550E-03    ( -9.645871E-05   9.603240E-05) )
------------------------------------------------------------
 Chi-Squared =      47.60735     using    59 PHA bins.
 Reduced chi-squared =     0.8352166     for     57 degrees of freedom
 Null hypothesis probability = 0.808
 
Photon flux (15-150 keV)    in 177.1 sec: 0.383177 ( -0.014704  0.014794 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.44174e-06 ( -1.57902e-07  1.58079e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -28.748 sec. to  148.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.47524     ( -0.270480   0.329544 )
Epeak [keV] : 71.5725      ( -12.3642 130.607 )
Norm@50keV  : 4.133105E-03    ( -1.246217E-03   1.425661E-03) )
------------------------------------------------------------
 Chi-Squared =      43.70632     using    59 PHA bins.
 Reduced chi-squared =     0.7804700     for     56 degrees of freedom
 Null hypothesis probability = 0.884
 
Photon flux (15-150 keV)    in 177.1 sec: 0.372268 ( -0.01716  0.017222 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.31892e-06 ( -1.90666e-07  1.88948e-07 ) ergs/cm2
 
Band function
Time interval is from  -28.748 sec. to  148.356 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.41140   ( -0.247111   0.357854 )
beta        : -2.16004    ( -7.11536   1.00780 )
Epeak [keV] : 66.0305      ( -21.4156 113.254 )
Norm@50keV   : 4.483914E-03    ( -3.986374E-03   1.556052E-03) )
------------------------------------------------------------
 Chi-Squared =      43.91114     using    59 PHA bins.
 Reduced chi-squared =     0.7983844     for     55 degrees of freedom
 Null hypothesis probability = 0.858
 
Photon flux (15-150 keV)    in 177.1 sec: 0.372281 ( -0.017184  0.017275 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.31439e-06 ( -1.91126e-07  1.89515e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    2.616 sec. to    3.616 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.11449     ( -0.303102   0.335769 )
Norm@50keV  : 5.967320E-03    ( -1.399096E-03   1.362892E-03) )
------------------------------------------------------------
 Chi-Squared =      47.16368     using    59 PHA bins.
 Reduced chi-squared =     0.8274330     for     57 degrees of freedom
 Null hypothesis probability = 0.820
 
Photon flux (15-150 keV)    in 1.000 sec: 0.945647 ( -0.160041  0.160043 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.55347e-08 ( -1.1435e-08  1.19065e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    2.616 sec. to    3.616 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.03765     ( -1.86721   1.13350 )
Epeak [keV] : 34.7908      ( -34.7808 9965.21 )
Norm@50keV  : 2.683510E-02    ( -2.683510E-02   0.398042 )
------------------------------------------------------------
 Chi-Squared =      44.94387     using    59 PHA bins.
 but latest trial   2.02175     gives Chi-Squared =   2.46239
 Reduced chi-squared =     0.8025692     for     56 degrees of freedom
 Null hypothesis probability = 0.855
 
Photon flux (15-150 keV)    in 1.000 sec: 0.923129 ( -0.160888  0.161341 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.04585e-08 ( -1.15997e-08  1.30675e-08 ) ergs/cm2
 
Band function
Time interval is from    2.616 sec. to    3.616 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.04290   ( -8.95710   1.87048 )
beta        : -9.13958    ( -0.860415   19.1396 )
Epeak [keV] : 34.7307      ( -34.6307 9965.27 )
Norm@50keV   : 2.666538E-02    ( -2.666538E-02   0.595797 )
------------------------------------------------------------
 Chi-Squared =      44.94390     using    59 PHA bins.
 Reduced chi-squared =     0.8171619     for     55 degrees of freedom
 Null hypothesis probability = 0.831
 
Photon flux (15-150 keV)    in 1.000 sec: 0.923047 ( -0.160726  0.161523 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.03929e-08 ( -1.12874e-08  1.30367e-08 ) ergs/cm2
 
Plot creation:
Wed Jan  9 19:02:52 EST 2008