batgrbproduct Analysis for Trigger=303609

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Tue Feb 19 05:12:25 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger303609/GCN5_download_cron
======================================================================

  Trigger: 00303609      Segment: 000

  BAT Trigger Time: 225058125.376   [s; MET]
      Trigger Stop: 225058129.472   [s; MET]
               UTC: 2008-02-18T20:08:42.791800    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 355.921970640896   Dec: 12.174721597336  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.62
     Image Trigger?:     NO
     Rate S/N Ratio:     9.8488578017961  [ if not an image trigger ]
     Image S/N Ratio:    6.62

  Flight Position:   [ source = BAT ]
    RA: 355.921970640896   Dec: 12.174721597336  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 355.936878272606   Dec: 12.1545145510239  [deg; J2000]  
        { 23h 43m 44.9s , +12d 09' 16.3" }
         +/- 2.43279072389081 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.09273969649904 [arcmin] (formal 1-sigma fit error)
    SNR: 8.54161837515128
    RA  =  23h 43m 44.9s  (355.936878 deg.)
    Dec =  12d  9' 16" (12.154515 deg.)
 
  Angular difference between Flight and Ground position is 1.494824 arcmin
 
  Partial Coding Fraction: 0.2109375    [ including projection effects ]

  Duration
     T90: 22.5279999673367 +/- 5.6594162095639
        Measured from: -11.5039999783039
                   to: 11.0239999890327     [s; relative to TRIGTIME]
     T50: 7.58399999141693 +/- 7.17352018969372
        Measured from: 1.32800000905991
                   to: 8.91200000047684     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.21999999880791     
                   to: 2.21999999880791     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -12.3519999980927     
                   to: 19.5680000185966     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.452308   0.521992   0.159970   0.061230
           0.070685   0.072258   0.065848   0.061317 [error]
 Peak      0.049233   0.051941   0.026669   0.007736
           0.013652   0.014049   0.012246   0.010949 [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 1.89e-07 2.16e-07 1.77e-07 2.43e-07 6.72e-07 8.32e-07   erg/cm2
              Error 4.25e-08 3.97e-08 5.89e-08 1.54e-07 1.40e-07 2.33e-07   erg/cm2
Peak flux Power-law 8.08e-01 4.25e-01 1.39e-01 5.87e-02 1.41e+00 1.43e+00   ph/cm2/s
              Error 2.92e-01 1.42e-01 9.31e-02 8.13e-02 4.01e-01 4.11e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.67e-07 2.64e-07 1.53e-07 2.31e-08 6.04e-07 6.04e-07   erg/cm2
              Error 5.03e-08 5.85e-08 7.71e-08 8.42e-08 1.38e-07 1.61e-07   erg/cm2
Peak flux Cutoff-PL 8.08e-01 4.26e-01 1.39e-01 5.83e-02 1.41e+00 1.43e+00   ph/cm2/s
              Error 2.92e-01 1.42e-01 9.31e-02 8.08e-02 4.01e-01 4.11e-01   ph/cm2/s
 
Fluence        Band 1.64e-07 2.63e-07 1.51e-07 2.21e-08 6.01e-07 5.91e-07   erg/cm2
              Error 2.80e-08 4.65e-08 3.54e-08 1.13e-07 9.27e-08 1.61e-07   erg/cm2
Peak flux      Band 8.08e-01 4.26e-01 1.39e-01 5.83e-02 1.41e+00 1.43e+00   ph/cm2/s
              Error 2.96e-01 1.42e-01 9.31e-02 8.08e-02 3.02e-01 4.11e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.287    0.336    -      -           2.21e-03 5.44e-04   51.202 57
CPL   0.471    1.991      33.1   21.9      2.68e-02 4.48e-01   47.188  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.612    0.718    -      -           6.67e-03 3.43e-03   48.463 57
CPL   1.919    0.000       4.3    0.0      1.80e-02 1.28e-02   48.702  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   31.920  -12.352   19.568
T90    22.528  -11.504   11.024
T50     7.584    1.328    8.912
Peak    1.000    1.220    2.220

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  355.9369 +12.1545 0.0225   47.4  -36.1       1.3061     8.5  TRIG_00303609       
------------------------------------------
 
Foreground time interval of the image:
-12.352  19.568 (delta_t =  31.920 [sec])
Background time interval of the image:
-239.376 -169.546 (delta_t =  69.830 [sec])
-168.376 -12.352 (delta_t = 156.024 [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  -12.352 sec. to   19.568 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.28739     ( -0.315280   0.356365 )
Norm@50keV  : 2.206811E-03    ( -5.493470E-04   5.381985E-04) )
------------------------------------------------------------
 Chi-Squared =      51.20160     using    59 PHA bins.
 Reduced chi-squared =     0.8982736     for     57 degrees of freedom
 Null hypothesis probability = 0.691
 
Photon flux (15-150 keV)    in 31.92 sec: 0.383136 ( -0.066926  0.066945 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.71929e-07 ( -1.37546e-07  1.42756e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -12.352 sec. to   19.568 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.470835     ( -2.50078   1.48052 )
Epeak [keV] : 33.0629      ( -33.0529 10.7499 )
Norm@50keV  : 2.680625E-02    ( -2.680625E-02   0.869476 )
------------------------------------------------------------
 Chi-Squared =      47.18832     using    59 PHA bins.
 but latest trial   2.06451     gives Chi-Squared =   5.33987
 Reduced chi-squared =     0.8426486     for     56 degrees of freedom
 Null hypothesis probability = 0.793
 
Photon flux (15-150 keV)    in 31.92 sec: 0.366600 ( -0.068495  0.068395 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.0378e-07 ( -1.29289e-07  1.46538e-07 ) ergs/cm2
 
Band function
Time interval is from  -12.352 sec. to   19.568 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.720078   ( -1.11538   3.40141 )
beta        : -9.22806    ( -0.771945   19.2279 )
Epeak [keV] : 32.4292      ( -21.8291 11.5213 )
Norm@50keV   : 1.890364E-02    ( -3.227161E-03   1.36729 )
------------------------------------------------------------
 Chi-Squared =      47.24236     using    59 PHA bins.
 Reduced chi-squared =     0.8589520     for     55 degrees of freedom
 Null hypothesis probability = 0.762
 
Photon flux (15-150 keV)    in 31.92 sec: 0.366301 ( -0.063479  0.034637 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.01427e-07 ( -1.02683e-07  8.26409e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    1.216 sec. to    2.224 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.61213     ( -0.608378   0.827482 )
Norm@50keV  : 6.669008E-03    ( -3.470335E-03   3.381759E-03) )
------------------------------------------------------------
 Chi-Squared =      48.46346     using    59 PHA bins.
 Reduced chi-squared =     0.8502361     for     57 degrees of freedom
 Null hypothesis probability = 0.782
 
Photon flux (15-150 keV)    in 1.008 sec: 1.40552 ( -0.40138  0.4014 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.94484e-08 ( -2.42077e-08  2.61163e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.216 sec. to    2.224 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.91895     (     )
Epeak [keV] : 4.30712      (   )
Norm@50keV  : 1.802440E-02    ( -1.610802E-02   9.486504E-03) )
------------------------------------------------------------
 Chi-Squared =      48.70193     using    59 PHA bins.
 but latest trial  -1.31483     gives Chi-Squared =   1.64799
 but latest trial  2.829585E-02 gives Chi-Squared =   4.09032
 Reduced chi-squared =     0.8696772     for     56 degrees of freedom
 Null hypothesis probability = 0.745
 
Photon flux (15-150 keV)    in 1.008 sec: 1.40501 ( -0.40124  0.40125 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.9324e-08 ( -2.65638e-08  2.62612e-08 ) ergs/cm2
 
Band function
Time interval is from    1.216 sec. to    2.224 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.71988   ( -3.99855   11.0015 )
beta        : -9.30616    (     )
Epeak [keV] : 14.2099      (   )
Norm@50keV   : 2.099003E-02    (     )
------------------------------------------------------------
 Chi-Squared =      48.95597     using    59 PHA bins.
 Reduced chi-squared =     0.8901086     for     55 degrees of freedom
 Null hypothesis probability = 0.704
 
Photon flux (15-150 keV)    in 1.008 sec: 1.40501 ( -0.20324  0.40125 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.07e-08 ( -2.01937e-08  2.48405e-08 ) ergs/cm2
 
Plot creation:
Tue Feb 19 05:44:51 EST 2008