batgrbproduct Analysis for Trigger=311159

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed May  7 04:26:53 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger311159/GCN5_download_cron
======================================================================

  Trigger: 00311159      Segment: 000

  BAT Trigger Time: 231788784   [s; MET]
      Trigger Stop: 231788848   [s; MET]
               UTC: 2008-05-06T17:46:21.229360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 329.434621981101   Dec: 39.002344120271  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.18
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.18

  Flight Position:   [ source = BAT ]
    RA: 329.434621981101   Dec: 39.002344120271  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 329.466889012691   Dec: 38.9611140662285  [deg; J2000]  
        { 21h 57m 52.1s , +38d 57' 40.0" }
         +/- 2.53525564178275 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.75964491438809 [arcmin] (formal 1-sigma fit error)
    SNR: 8.05275414818448
    RA  =  21h 57m 52.1s  (329.466889 deg.)
    Dec =   38d 57' 40" (38.961114 deg.)
 
  Angular difference between Flight and Ground position is 2.895619 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 150.176000028849 +/- 10.0777854600822
        Measured from: 33.6119999885559
                   to: 183.788000017405     [s; relative to TRIGTIME]
     T50: 101.159999996424 +/- 55.6496299940482
        Measured from: 60.0200000107288
                   to: 161.180000007153     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 134.476000010967     
                   to: 135.476000010967     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 25.8280000090599     
                   to: 188.796000003815     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.733492   0.868650   0.492548   0.226400
           0.072733   0.073343   0.066421   0.061320 [error]
 Peak      0.012036   0.017449   0.005770   0.010316
           0.004954   0.005045   0.004637   0.004221 [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 2.61e-07 3.82e-07 4.18e-07 8.56e-07 1.32e-06 1.92e-06   erg/cm2
              Error 4.13e-08 3.78e-08 6.72e-08 2.87e-07 1.52e-07 3.48e-07   erg/cm2
Peak flux Power-law 1.50e-01 1.25e-01 7.13e-02 6.02e-02 3.73e-01 4.06e-01   ph/cm2/s
              Error 8.12e-02 4.41e-02 3.89e-02 7.61e-02 1.31e-01 1.44e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.61e-07 3.83e-07 4.18e-07 8.50e-07 1.32e-06 1.91e-06   erg/cm2
              Error 4.13e-08 3.78e-08 6.69e-08 2.85e-07 1.52e-07 3.46e-07   erg/cm2
Peak flux Cutoff-PL 1.49e-01 1.25e-01 7.13e-02 5.98e-02 3.72e-01 4.06e-01   ph/cm2/s
              Error 8.12e-02 4.41e-02 3.89e-02 7.56e-02 1.31e-01 1.44e-01   ph/cm2/s
 
Fluence        Band 2.61e-07 3.81e-07 4.12e-07 8.34e-07 1.31e-06 1.95e-06   erg/cm2
              Error 2.57e-08 3.75e-08 4.84e-08 2.00e-07 1.43e-07 1.92e-07   erg/cm2
Peak flux      Band 1.47e-01 1.27e-01 7.09e-02 5.83e-02 3.72e-01 4.03e-01   ph/cm2/s
              Error 5.46e-02 5.57e-02 5.58e-02 5.32e-02 1.31e-01 1.52e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.872    0.195    -      -           8.83e-04 1.02e-04   47.159 57
CPL   1.795    0.000     127.1    0.0      9.70e-04 5.21e-04   47.384 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.812    0.722    -      -           2.69e-03 1.13e-03   39.931 57
CPL   1.827    0.000    9886.9    0.0      2.68e-03 3.07e-01   39.933  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: 148.480000 sec.
T50 in the 50-300 keV band: 79.104000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  162.968   25.828  188.796
T90   150.176   33.612  183.788
T50   101.160   60.020  161.180
Peak    1.000  134.476  135.476

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  329.4669 +38.9611 0.0237   37.5  -19.4       0.7522     8.1  TRIG_00311159       
------------------------------------------
 
Foreground time interval of the image:
 25.828  72.301 (delta_t =  46.473 [sec])
Background time interval of the image:
-134.799  25.828 (delta_t = 160.627 [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   25.828 sec. to  188.796 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.87170     ( -0.191349   0.198253 )
Norm@50keV  : 8.829434E-04    ( -1.028287E-04   1.003661E-04) )
------------------------------------------------------------
 Chi-Squared =      47.15920     using    59 PHA bins.
 Reduced chi-squared =     0.8273544     for     57 degrees of freedom
 Null hypothesis probability = 0.821
 
Photon flux (15-150 keV)    in 163.0 sec: 0.125216 ( -0.012607  0.012632 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32313e-06 ( -1.51432e-07  1.5351e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   25.828 sec. to  188.796 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.79455     (     )
Epeak [keV] : 127.069      (   )
Norm@50keV  : 9.695257E-04    ( -1.175917E-04   9.246962E-04) )
------------------------------------------------------------
 Chi-Squared =      47.38449     using    59 PHA bins.
 Reduced chi-squared =     0.8461517     for     56 degrees of freedom
 Null hypothesis probability = 0.787
 
Photon flux (15-150 keV)    in 163.0 sec: 0.125169 ( -0.012603  0.012627 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32325e-06 ( -1.51606e-07  1.53388e-07 ) ergs/cm2
 
Band function
Time interval is from   25.828 sec. to  188.796 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.42026   ( -8.57974   6.42026 )
beta        : -1.87119    ( -0.205234   0.190653 )
Epeak [keV] : 18.4182      ( -18.3182 330.417 )
Norm@50keV   : 2.435761E-03    ( -2.435761E-03   1.52632 )
------------------------------------------------------------
 Chi-Squared =      47.15982     using    59 PHA bins.
 Reduced chi-squared =     0.8574513     for     55 degrees of freedom
 Null hypothesis probability = 0.765
 
Photon flux (15-150 keV)    in 163.0 sec: 0.125256 ( -0.012497  0.012358 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.31472e-06 ( -1.29499e-07  1.57481e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  134.476 sec. to  135.476 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.81209     ( -0.668691   0.774808 )
Norm@50keV  : 2.691033E-03    ( -1.186659E-03   1.078287E-03) )
------------------------------------------------------------
 Chi-Squared =      39.93102     using    59 PHA bins.
 Reduced chi-squared =     0.7005442     for     57 degrees of freedom
 Null hypothesis probability = 0.958
 
Photon flux (15-150 keV)    in 1.000 sec: 0.372573 ( -0.131093  0.131239 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.47722e-08 ( -1.0162e-08  1.07157e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  134.476 sec. to  135.476 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82733     (     )
Epeak [keV] : 9886.93      (   )
Norm@50keV  : 2.679408E-03    ( -1.221426E-03   0.613593 )
------------------------------------------------------------
 Chi-Squared =      39.93286     using    59 PHA bins.
 but latest trial   1.11765     gives Chi-Squared =  0.398331
 Reduced chi-squared =     0.7130868     for     56 degrees of freedom
 Null hypothesis probability = 0.948
 
Photon flux (15-150 keV)    in 1.000 sec: 0.372452 ( -0.131053  0.131198 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.47551e-08 ( -1.01562e-08  1.07427e-08 ) ergs/cm2
 
Band function
Time interval is from  134.476 sec. to  135.476 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.28333   ( -8.71667   6.28333 )
beta        : -1.86354    ( -8.13646   0.720239 )
Epeak [keV] : 41.2929      ( -41.1929 9958.71 )
Norm@50keV   : 6.118696E-03    ( -6.118697E-03   8.628553E-02) )
------------------------------------------------------------
 Chi-Squared =      39.93154     using    59 PHA bins.
 Reduced chi-squared =     0.7260280     for     55 degrees of freedom
 Null hypothesis probability = 0.937
 
Photon flux (15-150 keV)    in 1.000 sec: 0.371793 ( -0.130847  0.131072 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.46962e-08 ( -8.98e-09  8.6405e-09 ) ergs/cm2
 
Plot creation:
Wed May  7 04:59:44 EDT 2008