batgrbproduct Analysis for Trigger=318166

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Jul 28 10:20:48 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger318166/GCN5_download_cron
======================================================================

  Trigger: 00318166      Segment: 000

  BAT Trigger Time: 238890682.816   [s; MET]
      Trigger Stop: 238890684.864   [s; MET]
               UTC: 2008-07-27T22:31:19.842180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 255.47815111617   Dec: -40.8407209418678  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.59
     Image Trigger?:     NO
     Rate S/N Ratio:     8.66025403784439  [ if not an image trigger ]
     Image S/N Ratio:    7.59

  Flight Position:   [ source = BAT ]
    RA: 255.47815111617   Dec: -40.8407209418678  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 255.4025573412   Dec: -40.8519395878804  [deg; J2000]  
        { 17h 01m 36.6s , -40d 51' 07.0" }
         +/- 2.42981986548399 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.15628261461973 [arcmin] (formal 1-sigma fit error)
    SNR: 8.55654163643237
 
  Angular difference between Flight and Ground position is 3.496453 arcmin
 
  Partial Coding Fraction: 0.671875    [ including projection effects ]

  Duration
     T90: 8 +/- 2.23606797749979
        Measured from: -2.81600001454353
                   to: 5.18399998545647     [s; relative to TRIGTIME]
     T50: 3 +/- 2.23606797749979
        Measured from: -0.816000014543533
                   to: 2.18399998545647     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.816000014543533     
                   to: 0.183999985456467     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.81600001454353     
                   to: 6.18399998545647     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.278259   0.080816   0.022481   0.003538
           0.026093   0.022910   0.020764   0.020852 [error]
 Peak      0.036616   0.020461  -0.004511   0.006385
           0.008926   0.007793   0.006860   0.007020 [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 9.38e-08 3.84e-08 9.24e-09 2.71e-09 1.43e-07 1.44e-07   erg/cm2
              Error 1.64e-08 1.36e-08 7.44e-09 4.45e-09 2.89e-08 3.02e-08   erg/cm2
Peak flux Power-law 3.77e-01 1.52e-01 3.57e-02 1.02e-02 5.71e-01 5.74e-01   ph/cm2/s
              Error 1.16e-01 7.52e-02 4.01e-02 2.13e-02 2.11e-01 2.13e-01   ph/cm2/s
 
Fluence   Cutoff-PL 9.38e-08 3.84e-08 9.22e-09 2.68e-09 1.43e-07 1.44e-07   erg/cm2
              Error 1.64e-08 1.36e-08 7.43e-09 4.41e-09 2.89e-08 3.02e-08   erg/cm2
Peak flux Cutoff-PL 3.75e-01 1.76e-01 1.35e-02 7.80e-05 5.64e-01 5.64e-01   ph/cm2/s
              Error 1.68e-01 1.38e-01 3.45e-02 1.61e-02 2.04e-01 2.04e-01   ph/cm2/s
 
Fluence        Band 9.38e-08 3.64e-08 7.79e-09 1.97e-09 1.41e-07 1.34e-07   erg/cm2
              Error 1.15e-08 5.64e-09 3.20e-09 2.85e-08 2.25e-08 0.00e+00   erg/cm2
Peak flux      Band 3.78e-01 1.55e-01 3.74e-02 1.18e-02 5.88e-01 5.77e-01   ph/cm2/s
              Error 1.57e-01 7.19e-02 3.81e-02 1.16e-02 2.12e-01 2.14e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    4.054    0.666    -      -           6.94e-04 5.95e-04   54.702 57
CPL   1.812    0.000       2.0    8.4      3.98e-02 0.00e+00   54.699  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    3.086    0.980    -      -           1.95e-03 1.81e-03   62.133 57
CPL   1.031    4.970      13.5   18.5      5.74e-02 0.00e+00   61.119  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    9.000   -2.816    6.184
T90     8.000   -2.816    5.184
T50     3.000   -0.816    2.184
Peak    1.000   -0.816    0.184

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  255.4026 -40.8519 0.0226   38.0 -167.3       0.3957     8.6  TRIG_00318166       
------------------------------------------
 
Foreground time interval of the image:
 -2.816   6.184 (delta_t =   9.000 [sec])
Background time interval of the image:
-202.615 -13.966 (delta_t = 188.649 [sec])
-12.816  -2.816 (delta_t =  10.000 [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   -2.816 sec. to    6.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.05430     ( -0.604042   0.728349 )
Norm@50keV  : 6.935244E-04    ( -6.935244E-04   4.955012E-04) )
------------------------------------------------------------
 Chi-Squared =      54.70162     using    59 PHA bins.
 Reduced chi-squared =     0.9596775     for     57 degrees of freedom
 Null hypothesis probability = 0.562
 
Photon flux (15-150 keV)    in 9.000 sec: 0.448501 ( -0.075256  0.075334 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.43084e-07 ( -2.79702e-08  2.9898e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -2.816 sec. to    6.184 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.81162     (     )
Epeak [keV] : 1.96782      ( -1.93715 14.8348 )
Norm@50keV  : 3.979266E-02    (     )
------------------------------------------------------------
 Chi-Squared =      54.69889     using    59 PHA bins.
 but latest trial  0.228200     gives Chi-Squared =   64.9810
 Reduced chi-squared =     0.9767658     for     56 degrees of freedom
 Null hypothesis probability = 0.524
 
Photon flux (15-150 keV)    in 9.000 sec: 0.448211 ( -0.075216  0.075295 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.43045e-07 ( -2.79504e-08  2.99124e-08 ) ergs/cm2
 
Band function
Time interval is from   -2.816 sec. to    6.184 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.45616   ( -0.688945   1.04666 )
beta        : -5.15233    ( -0.729665   13.8212 )
Epeak [keV] : 15.1513      ( -15.0513 9984.85 )
Norm@50keV   : 1.135930E-02    ( -4.872488E-02   6.735190E-02) )
------------------------------------------------------------
 Chi-Squared =      75.39388     using    59 PHA bins.
 Reduced chi-squared =      1.370798     for     55 degrees of freedom
 Null hypothesis probability = 3.534E-02
 
Photon flux (15-150 keV)    in 9.000 sec: 0.449030 ( -0.07474  0.074738 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.4086e-07 ( -2.5974e-08  3.09591e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.816 sec. to    0.184 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.08575     ( -0.809773   1.14998 )
Norm@50keV  : 1.947430E-03    ( -1.947430E-03   1.681501E-03) )
------------------------------------------------------------
 Chi-Squared =      62.13284     using    59 PHA bins.
 Reduced chi-squared =      1.090050     for     57 degrees of freedom
 Null hypothesis probability = 0.298
 
Photon flux (15-150 keV)    in 1.000 sec: 0.570618 ( -0.210398  0.211357 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.43772e-08 ( -1.04495e-08  1.20433e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.816 sec. to    0.184 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.03087     ( -4.03087   5.90848 )
Epeak [keV] : 13.4945      ( -13.4845 23.5362 )
Norm@50keV  : 5.741027E-02    (     )
------------------------------------------------------------
 Chi-Squared =      61.11878     using    59 PHA bins.
 but latest trial   45.7794     gives Chi-Squared =   5.98609
 Reduced chi-squared =      1.091407     for     56 degrees of freedom
 Null hypothesis probability = 0.297
 
Photon flux (15-150 keV)    in 1.000 sec: 0.564474 ( -0.203355  0.2049 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.19258e-08 ( -8.5777e-09  1.15921e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.816 sec. to    0.184 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.33849   ( -8.66151   2.43963 )
beta        : -9.36348    ( -0.636521   19.3633 )
Epeak [keV] : 13.0862      ( -12.9862 17.0585 )
Norm@50keV   : 2.680190E-02    ( -0.256407   654.612 )
------------------------------------------------------------
 Chi-Squared =      61.38631     using    59 PHA bins.
 Reduced chi-squared =      1.116115     for     55 degrees of freedom
 Null hypothesis probability = 0.258
 
Photon flux (15-150 keV)    in 1.000 sec: 0.587933 ( -0.212189  0.212555 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.24329e-08 ( -8.6289e-09  1.19392e-08 ) ergs/cm2
 
Plot creation:
Mon Jul 28 11:02:02 EDT 2008