batgrbproduct Analysis for Trigger=308224

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Apr  2 21:09:00 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger308224/SDC
======================================================================

  Trigger: 00308224      Segment: 000

  BAT Trigger Time: 228689448   [s; MET]
      Trigger Stop: 228689560   [s; MET]
               UTC: 2008-03-31T20:50:45.316000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 268.621376273249   Dec: -26.3206436351591  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.1
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    9.1

  Flight Position:   [ source = BAT ]
    RA: 268.621376273249   Dec: -26.3206436351591  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 268.562819730521   Dec: -26.3656104745381  [deg; J2000]  
        { 17h 54m 15.1s , -26d 21' 56.2" }
         +/- 2.38514780504289 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.2699634478527 [arcmin] (formal 1-sigma fit error)
    SNR: 8.78639680932166
    RA  =  17h 54m 15.1s  (268.562820 deg.)
    Dec =  -26d 21' 56" (-26.365610 deg.)
 
  Angular difference between Flight and Ground position is 4.146389 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 615.819999992847 +/- 70.9726322690693
        Measured from: -76.6839999854565
                   to: 539.136000007391     [s; relative to TRIGTIME]
     T50: 345.532000005245 +/- 87.9282662233362
        Measured from: 51.1920000016689
                   to: 396.724000006914     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 548.303999990225     
                   to: 549.303999990225     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -107.00799998641     
                   to: 552.884000003338     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.681236   0.442121   0.058352   0.136164
           0.143793   0.127161   0.107104   0.091046 [error]
 Peak      0.030166   0.010745   0.008587   0.008076
           0.010916   0.009798   0.009172   0.007283 [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 7.02e-07 2.64e-07 5.75e-08 1.50e-08 1.03e-06 1.04e-06   erg/cm2
              Error 9.48e-08 6.67e-08 3.21e-08 1.48e-08 1.50e-07 1.54e-07   erg/cm2
Peak flux Power-law 2.32e-01 1.23e-01 4.09e-02 1.75e-02 4.06e-01 4.15e-01   ph/cm2/s
              Error 2.00e-01 1.05e-01 6.87e-02 1.69e-01 3.21e-01 3.29e-01   ph/cm2/s
 
Fluence   Cutoff-PL 7.50e-07 1.97e-07 2.83e-09 3.38e-13 9.50e-07 9.50e-07   erg/cm2
              Error 1.15e-07 9.67e-08 3.39e-08 7.08e-09 1.32e-07 1.42e-07   erg/cm2
Peak flux Cutoff-PL 2.32e-01 1.23e-01 4.07e-02 1.73e-02 4.06e-01 4.13e-01   ph/cm2/s
              Error 2.00e-01 1.05e-01 6.87e-02 1.68e-01 3.21e-01 3.28e-01   ph/cm2/s
 
Fluence        Band 7.04e-07 1.82e-07 1.29e-08 2.06e-09 9.87e-07 8.42e-07   erg/cm2
              Error 8.35e-08 8.18e-09 1.28e-07 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 1.64e-01 1.35e-01 6.94e-02 2.45e-02 4.13e-01 4.37e-01   ph/cm2/s
              Error 6.70e-02 7.82e-02 5.60e-02 1.26e-01 1.82e-01 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    4.200    0.459    -      -           6.12e-05 2.66e-05   80.017 57
CPL   1.262    0.000       5.4    7.8      1.51e-02 0.00e+00   77.676 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.576    2.800    -      -           1.96e-03 2.26e-03   66.222 57
CPL   2.108    3.536      42.1 5000.0      1.81e-03 3.98e+00   65.968  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  659.892 -107.008  552.884
T90   615.820  -76.684  539.136
T50   345.532   51.192  396.724
Peak    1.000  548.304  549.304

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  268.5628 -26.3656 0.0218    1.8 -133.0       1.9044     8.8  TRIG_00308224       
------------------------------------------
 
Foreground time interval of the image:
-107.008 126.005 (delta_t = 233.013 [sec])
Background time interval of the image:
-239.000 -107.008 (delta_t = 131.992 [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 -107.008 sec. to  552.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.20047     ( -0.437283   0.480008 )
Norm@50keV  : 6.122882E-05    ( -2.325828E-05   2.988444E-05) )
------------------------------------------------------------
 Chi-Squared =      80.01726     using    59 PHA bins.
 Reduced chi-squared =      1.403812     for     57 degrees of freedom
 Null hypothesis probability = 2.386E-02
 
Photon flux (15-150 keV)    in 659.9 sec: 4.507654E-02 ( -0.00583476  0.00583596 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03352e-06 ( -1.4791e-07  1.52635e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from -107.008 sec. to  552.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26212     (     )
Epeak [keV] : 5.43859      ( -12.5197 3.09319 )
Norm@50keV  : 1.509625E-02    (     )
------------------------------------------------------------
 Chi-Squared =      77.67621     using    59 PHA bins.
 Reduced chi-squared =      1.387075     for     56 degrees of freedom
 Null hypothesis probability = 2.922E-02
 
Photon flux (15-150 keV)    in 659.9 sec: 4.504650E-02 ( -0.00583145  0.00583226 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.49728e-07 ( -1.33082e-07  1.30013e-07 ) ergs/cm2
 
Band function
Time interval is from -107.008 sec. to  552.884 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.45225   (     )
beta        : -4.31425    (     )
Epeak [keV] : 15.1712      (   )
Norm@50keV   : 1.016399E-03    (     )
------------------------------------------------------------
 Chi-Squared =      123.8794     using    59 PHA bins.
 Reduced chi-squared =      2.252353     for     55 degrees of freedom
 Null hypothesis probability = 3.177E-07
 
Photon flux (15-150 keV)    in 659.9 sec: 4.601804E-02 ( -0.00600663  0.00586076 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.86616e-07 ( -1.29954e-07  1.2608e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  548.304 sec. to  549.304 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.57634     ( -2.23152   3.36924 )
Norm@50keV  : 1.960691E-03    ( -1.960691E-03   2.567673E-03) )
------------------------------------------------------------
 Chi-Squared =      66.22217     using    59 PHA bins.
 Reduced chi-squared =      1.161792     for     57 degrees of freedom
 Null hypothesis probability = 0.189
 
Photon flux (15-150 keV)    in 1.000 sec: 0.405944 ( -0.405944  0.235774 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.00258e-08 ( -1.47826e-08  2.31899e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  548.304 sec. to  549.304 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.10759     ( -4.94691   2.12539 )
Epeak [keV] : 42.0820      ( -42.0703 9957.92 )
Norm@50keV  : 1.811655E-03    ( -1.811655E-03   7.95833 )
------------------------------------------------------------
 Chi-Squared =      65.96796     using    59 PHA bins.
 but latest trial  -5.81351     gives Chi-Squared =   1.53491
 Reduced chi-squared =      1.177999     for     56 degrees of freedom
 Null hypothesis probability = 0.170
 
Photon flux (15-150 keV)    in 1.000 sec: 0.405617 ( -0.405617  0.235748 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.99997e-08 ( -1.99997e-08  2.31832e-08 ) ergs/cm2
 
Band function
Time interval is from  548.304 sec. to  549.304 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.38168   ( -1.306534E-04   14.9999 )
beta        : -1.61954    ( -3.40078   2.19950 )
Epeak [keV] : 6.10982      ( -6.00982 9993.89 )
Norm@50keV   : 7.970820E-03    ( -0.273875   0.341624 )
------------------------------------------------------------
 Chi-Squared =      66.93564     using    59 PHA bins.
 Reduced chi-squared =      1.217012     for     55 degrees of freedom
 Null hypothesis probability = 0.130
 
Photon flux (15-150 keV)    in 1.000 sec: 0.413066 ( -0.129635  0.234128 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.02126e-08 ( -1.49401e-08  1.53029e-08 ) ergs/cm2
 
Plot creation:
Wed Apr  2 21:52:09 EDT 2008