batgrbproduct Analysis for Trigger=315080

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Jun 23 23:44:47 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger315080/GCN5_download_cron
======================================================================

  Trigger: 00315080      Segment: 000

  BAT Trigger Time: 235909531.328   [s; MET]
      Trigger Stop: 235909531.84   [s; MET]
               UTC: 2008-06-23T10:25:28.440240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 237.659837169095   Dec: -62.0380947683357  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.53
     Image Trigger?:     NO
     Rate S/N Ratio:     12.0415945787923  [ if not an image trigger ]
     Image S/N Ratio:    7.53

  Flight Position:   [ source = BAT ]
    RA: 237.659837169095   Dec: -62.0380947683357  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 237.667153566644   Dec: -62.0436500827693  [deg; J2000]  
        { 15h 50m 40.1s , -62d 02' 37.1" }
         +/- 1.37666718620988 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.660521738430828 [arcmin] (formal 1-sigma fit error)
    SNR: 19.2659883385746
 
  Angular difference between Flight and Ground position is 0.391741 arcmin
 
  Partial Coding Fraction: 0.3320312    [ including projection effects ]

  Duration
     T90: 15.1520000100136 +/- 5.16703280752161
        Measured from: -0.168000012636185
                   to: 14.9839999973774     [s; relative to TRIGTIME]
     T50: 6.36800000071526 +/- 0.990724984794847
        Measured from: 1.30799999833107
                   to: 7.67599999904633     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 7.22799998521805     
                   to: 8.22799998521805     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.672000020742416     
                   to: 15.9880000054836     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.385269   0.550713   0.482487   0.128994
           0.040439   0.041446   0.038582   0.037779 [error]
 Peak      0.057348   0.097033   0.074921   0.023680
           0.010393   0.011507   0.010693   0.009239 [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 1.16e-07 2.33e-07 3.66e-07 1.27e-06 1.02e-06 1.98e-06   erg/cm2
              Error 1.76e-08 2.08e-08 3.81e-08 2.98e-07 9.35e-08 3.23e-07   erg/cm2
Peak flux Power-law 5.75e-01 6.46e-01 5.19e-01 6.94e-01 2.00e+00 2.43e+00   ph/cm2/s
              Error 1.34e-01 9.50e-02 8.44e-02 2.29e-01 2.71e-01 3.43e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.16e-07 2.35e-07 3.68e-07 1.12e-06 1.01e-06 1.60e-06   erg/cm2
              Error 2.13e-08 2.24e-08 3.66e-08 5.44e-07 1.01e-07 0.00e+00   erg/cm2
Peak flux Cutoff-PL 4.77e-01 7.12e-01 5.62e-01 2.50e-01 1.92e+00 2.00e+00   ph/cm2/s
              Error 1.62e-01 1.21e-01 1.01e-01 2.98e-01 2.83e-01 4.04e-01   ph/cm2/s
 
Fluence        Band 1.11e-07 2.35e-07 3.70e-07 1.05e-06 1.01e-06 1.66e-06   erg/cm2
              Error 2.08e-08 2.31e-08 4.17e-08 5.42e-07 1.01e-07 5.57e-07   erg/cm2
Peak flux      Band 4.41e-01 7.43e-01 5.39e-01 4.11e-01 1.91e+00 2.13e+00   ph/cm2/s
              Error 2.12e-01 1.25e-01 9.88e-02 2.96e-01 2.72e-01 4.13e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.348    0.149    -      -           6.26e-03 5.09e-04   62.727 57
CPL   1.178    0.443     255.3 5000.0      7.52e-03 4.01e-03   62.588 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.315    0.222    -      -           1.67e-02 2.26e-03   41.969 57
CPL   0.265    1.206      82.6  372.6      5.65e-02 1.29e-01   38.964  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: 8.320000 sec.
T50 in the 50-300 keV band: 5.184000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   16.660   -0.672   15.988
T90    15.152   -0.168   14.984
T50     6.368    1.308    7.676
Peak    1.000    7.228    8.228

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  237.6672 -62.0437 0.0100   31.3  107.4       1.6138    19.3  TRIG_00315080       
------------------------------------------
 
Foreground time interval of the image:
 -0.672  15.988 (delta_t =  16.660 [sec])
Background time interval of the image:
-239.328  -0.672 (delta_t = 238.656 [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   -0.672 sec. to   15.988 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.34847     ( -0.149288   0.149583 )
Norm@50keV  : 6.263820E-03    ( -5.098237E-04   5.089114E-04) )
------------------------------------------------------------
 Chi-Squared =      62.72717     using    59 PHA bins.
 Reduced chi-squared =      1.100477     for     57 degrees of freedom
 Null hypothesis probability = 0.280
 
Photon flux (15-150 keV)    in 16.66 sec: 0.754373 ( -0.062692  0.062863 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01965e-06 ( -9.3211e-08  9.38125e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.672 sec. to   15.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.17811     ( -0.572236   0.313608 )
Epeak [keV] : 255.300      ( -255.290 9744.70 )
Norm@50keV  : 7.522552E-03    ( -1.734185E-03   6.276183E-03) )
------------------------------------------------------------
 Chi-Squared =      62.58811     using    59 PHA bins.
 Reduced chi-squared =      1.117645     for     56 degrees of freedom
 Null hypothesis probability = 0.254
 
Photon flux (15-150 keV)    in 16.66 sec: 0.754087 ( -0.06267  0.062839 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01289e-06 ( -1.0382e-07  9.83523e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.672 sec. to   15.988 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.08831   ( -8.91169   6.08750 )
beta        : -1.34843    ( -0.149481   0.149301 )
Epeak [keV] : 38.8031      ( -38.7031 9961.20 )
Norm@50keV   : 1.202623E-02    ( -1.202623E-02   1.33021 )
------------------------------------------------------------
 Chi-Squared =      62.72717     using    59 PHA bins.
 Reduced chi-squared =      1.140494     for     55 degrees of freedom
 Null hypothesis probability = 0.221
 
Photon flux (15-150 keV)    in 16.66 sec: 0.748842 ( -0.066742  0.06598 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00989e-06 ( -1.01286e-07  1.001e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    7.228 sec. to    8.228 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31500     ( -0.221931   0.222206 )
Norm@50keV  : 1.667529E-02    ( -2.259921E-03   2.254769E-03) )
------------------------------------------------------------
 Chi-Squared =      41.96891     using    59 PHA bins.
 Reduced chi-squared =     0.7362967     for     57 degrees of freedom
 Null hypothesis probability = 0.932
 
Photon flux (15-150 keV)    in 1.000 sec: 1.99501 ( -0.27118  0.27154 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.64229e-07 ( -2.4752e-08  2.5028e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    7.228 sec. to    8.228 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.264742     ( -1.38336   1.02933 )
Epeak [keV] : 82.6249      ( -23.2949 721.978 )
Norm@50keV  : 5.650364E-02    ( -3.895346E-02   0.218062 )
------------------------------------------------------------
 Chi-Squared =      38.96363     using    59 PHA bins.
 but latest trial  1.752166E-02 gives Chi-Squared =   3.29826
 Reduced chi-squared =     0.6957792     for     56 degrees of freedom
 Null hypothesis probability = 0.960
 
Photon flux (15-150 keV)    in 1.000 sec: 1.92037 ( -0.2843  0.28269 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51911e-07 ( -2.7689e-08  2.8265e-08 ) ergs/cm2
 
Band function
Time interval is from    7.228 sec. to    8.228 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.289386   ( -1.43877   2.94284 )
beta        : -1.94639    ( -8.05361   0.635643 )
Epeak [keV] : 64.8033      ( -35.0606 174.671 )
Norm@50keV   : 0.118850    ( -0.118850   94.8670 )
------------------------------------------------------------
 Chi-Squared =      38.18179     using    59 PHA bins.
 Reduced chi-squared =     0.6942143     for     55 degrees of freedom
 Null hypothesis probability = 0.959
 
Photon flux (15-150 keV)    in 1.000 sec: 1.91121 ( -0.279  0.26446 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51762e-07 ( -2.7638e-08  2.8303e-08 ) ergs/cm2
 
Plot creation:
Tue Jun 24 00:16:48 EDT 2008