batgrbproduct Analysis for Trigger=318101

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sun Jul 27 15:13:20 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger318101/GCN5_download_cron
======================================================================

  Trigger: 00318101      Segment: 000

  BAT Trigger Time: 238839207.932   [s; MET]
      Trigger Stop: 238839207.996   [s; MET]
               UTC: 2008-07-27T08:13:24.959660    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 276.869989337883   Dec: 1.17214157120085  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.73
     Image Trigger?:     NO
     Rate S/N Ratio:     38.2230297072328  [ if not an image trigger ]
     Image S/N Ratio:    10.73

  Flight Position:   [ source = BAT ]
    RA: 276.869989337883   Dec: 1.17214157120085  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 276.870920644792   Dec: 1.17295696169464  [deg; J2000]  
        { 18h 27m 29.0s , +01d 10' 22.6" }
         +/- 0.638820707145399 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.182153494893965 [arcmin] (formal 1-sigma fit error)
    SNR: 57.6963581770422
 
  Angular difference between Flight and Ground position is 0.074260 arcmin
 
  Partial Coding Fraction: 0.6875    [ including projection effects ]

  Duration
     T90: 8.62800002098083 +/- 0.153310150613681
        Measured from: 0.0919999778270721
                   to: 8.71999999880791     [s; relative to TRIGTIME]
     T50: 6.3120000064373 +/- 0.110634524953673
        Measured from: 1
                   to: 7.3120000064373     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0400000214576721     
                   to: 0.959999978542328     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.224000006914139     
                   to: 9.39999997615814     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.823569   1.459705   1.538938   0.416558
           0.026841   0.028153   0.027319   0.020326 [error]
 Peak      0.171157   0.311187   0.368811   0.114831
           0.009987   0.011359   0.011698   0.008591 [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 2.68e-07 6.21e-07 1.14e-06 5.03e-06 3.10e-06 6.05e-06   erg/cm2
              Error 1.32e-08 1.80e-08 2.80e-08 2.92e-07 7.29e-08 0.00e+00   erg/cm2
Peak flux Power-law 1.65e+00 2.29e+00 2.34e+00 4.37e+00 7.68e+00 1.07e+01   ph/cm2/s
              Error 1.34e-01 1.11e-01 9.36e-02 3.88e-01 2.96e-01 5.52e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.44e-07 6.28e-07 1.18e-06 3.47e-06 3.07e-06 3.41e-06   erg/cm2
              Error 1.77e-08 1.88e-08 3.53e-08 6.67e-07 3.82e-08 0.00e+00   erg/cm2
Peak flux Cutoff-PL 1.55e+00 2.31e+00 2.41e+00 3.50e+00 7.60e+00 9.77e+00   ph/cm2/s
              Error 1.76e-01 1.16e-01 1.21e-01 8.98e-01 3.03e-01 8.80e-01   ph/cm2/s
 
Fluence        Band 2.41e-07 6.26e-07 1.18e-06 3.46e-06 3.07e-06 3.18e-06   erg/cm2
              Error 1.75e-08 1.88e-08 3.53e-08 6.90e-07 7.64e-08 0.00e+00   erg/cm2
Peak flux      Band 1.55e+00 2.31e+00 2.41e+00 3.75e+00 7.59e+00 9.32e+00   ph/cm2/s
              Error 1.82e-01 1.19e-01 1.22e-01 1.43e+00 3.14e-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    1.120    0.041    -      -           3.11e-02 7.14e-04   54.125 57
CPL   0.800    0.174     227.2  119.2      4.22e-02 6.90e-03   43.576 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.967    0.067    -      -           6.68e-02 2.53e-03   44.244 57
CPL   0.739    0.267     331.0 4908.9      8.35e-02 2.16e-02   42.050 56
 
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: 8.128000 sec.
T50 in the 50-300 keV band: 6.272000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    9.624   -0.224    9.400
T90     8.628    0.092    8.720
T50     6.312    1.000    7.312
Peak    1.000   -0.040    0.960

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  276.8709  +1.1730 0.0033   27.2   28.7       2.8020    57.7  TRIG_00318101       
------------------------------------------
 
Foreground time interval of the image:
 -0.224   6.769 (delta_t =   6.993 [sec])
Background time interval of the image:
-239.932  -0.224 (delta_t = 239.708 [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   -0.224 sec. to    9.400 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.12030     ( -4.138768E-02   4.121101E-02) )
Norm@50keV  : 3.105400E-02    ( -7.144641E-04   7.135198E-04) )
------------------------------------------------------------
 Chi-Squared =      54.12532     using    59 PHA bins.
 Reduced chi-squared =     0.9495670     for     57 degrees of freedom
 Null hypothesis probability = 0.584
 
Photon flux (15-150 keV)    in 9.624 sec: 3.60947 ( -0.08804  0.0882 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.10474e-06 ( -7.28441e-08  7.29018e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.224 sec. to    9.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.800277     ( -0.176738   0.170477 )
Epeak [keV] : 227.153      ( -59.0034 179.364 )
Norm@50keV  : 4.223231E-02    ( -6.241307E-03   7.567611E-03) )
------------------------------------------------------------
 Chi-Squared =      43.57648     using    59 PHA bins.
 Reduced chi-squared =     0.7781515     for     56 degrees of freedom
 Null hypothesis probability = 0.887
 
Photon flux (15-150 keV)    in 9.624 sec: 3.54039 ( -0.09402  0.09439 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.06722e-06 ( -3.82939e-08  3.81977e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.224 sec. to    9.400 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.800503   ( -0.170262   0.177000 )
beta        : -9.16424    ( -0.835760   4.89288 )
Epeak [keV] : 227.250      ( -59.1292 179.199 )
Norm@50keV   : 4.222019E-02    ( -6.232329E-03   7.579096E-03) )
------------------------------------------------------------
 Chi-Squared =      43.57640     using    59 PHA bins.
 Reduced chi-squared =     0.7922983     for     55 degrees of freedom
 Null hypothesis probability = 0.867
 
Photon flux (15-150 keV)    in 9.624 sec: 3.54045 ( -0.09423  0.09467 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.06518e-06 ( -7.64819e-08  7.63376e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.040 sec. to    0.960 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.967258     ( -6.750381E-02   6.689811E-02) )
Norm@50keV  : 6.677951E-02    ( -2.535813E-03   2.527967E-03) )
------------------------------------------------------------
 Chi-Squared =      44.24406     using    59 PHA bins.
 Reduced chi-squared =     0.7762116     for     57 degrees of freedom
 Null hypothesis probability = 0.891
 
Photon flux (15-150 keV)    in 1.000 sec: 7.67692 ( -0.29565  0.29597 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.30685e-07 ( -2.9601e-08  2.962e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.040 sec. to    0.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.739409     ( -0.280370   0.254289 )
Epeak [keV] : 331.013      ( -148.818 9668.99 )
Norm@50keV  : 8.354712E-02    ( -1.758272E-02   2.555071E-02) )
------------------------------------------------------------
 Chi-Squared =      42.04990     using    59 PHA bins.
 Reduced chi-squared =     0.7508911     for     56 degrees of freedom
 Null hypothesis probability = 0.917
 
Photon flux (15-150 keV)    in 1.000 sec: 7.59925 ( -0.3001  0.3057 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.24655e-07 ( -3.0563e-08  3.0697e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.040 sec. to    0.960 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.810028   ( -9.18997   5.80849 )
beta        : -0.967234    ( -6.691206E-02   6.749964E-02) )
Epeak [keV] : 53.1693      ( -393.775 9606.12 )
Norm@50keV   : 0.106393    ( -1.422868E-02   1650.22 )
------------------------------------------------------------
 Chi-Squared =      44.24406     using    59 PHA bins.
 Reduced chi-squared =     0.8044375     for     55 degrees of freedom
 Null hypothesis probability = 0.850
 
Photon flux (15-150 keV)    in 1.000 sec: 7.59169 ( -0.31295  0.31426 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.24201e-07 ( -3.0859e-08  3.0638e-08 ) ergs/cm2
 
Plot creation:
Sun Jul 27 15:57:57 EDT 2008