batgrbproduct Analysis for Trigger=306754

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Mar 19 10:36:22 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger306754/GCN5_download_cron
======================================================================

  Trigger: 00306754      Segment: 000

  BAT Trigger Time: 227598344.704   [s; MET]
      Trigger Stop: 227598356.864   [s; MET]
               UTC: 2008-03-19T05:45:42.050320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 206.354093753083   Dec: 44.0789866539064  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.23
     Image Trigger?:     NO
     Rate S/N Ratio:     15.9687194226713  [ if not an image trigger ]
     Image S/N Ratio:    7.23

  Flight Position:   [ source = BAT ]
    RA: 206.354093753083   Dec: 44.0789866539064  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 206.352368815527   Dec: 44.0798033417619  [deg; J2000]  
        { 13h 45m 24.6s , +44d 04' 47.3" }
         +/- 1.68179060463727 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.69518741623165 [arcmin] (formal 1-sigma fit error)
    SNR: 14.4739498293241
    RA  =  13h 45m 24.6s  (206.352369 deg.)
    Dec =   44d  4' 47" (44.079803 deg.)
 
  Angular difference between Flight and Ground position is 0.089045 arcmin
 
  Partial Coding Fraction: 0.07421875    [ including projection effects ]

  Duration
     T90: 64 +/- 35.7770876399966
        Measured from: -7.7039999961853
                   to: 56.2960000038147     [s; relative to TRIGTIME]
     T50: 32 +/- 16
        Measured from: -7.7039999961853
                   to: 24.2960000038147     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 31.7960000038147     
                   to: 32.7960000038147     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -7.7039999961853     
                   to: 72.2960000038147     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.677262   2.406081   2.159682   0.445040
           0.169963   0.174870   0.154953   0.129535 [error]
 Peak      0.544984   0.648404   0.614212   0.188416
           0.077727   0.080085   0.071699   0.058270 [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 7.18e-07 1.25e-06 1.65e-06 4.45e-06 4.82e-06 8.09e-06   erg/cm2
              Error 1.01e-07 1.06e-07 1.51e-07 8.84e-07 3.77e-07 9.81e-07   erg/cm2
Peak flux Power-law 4.37e-01 4.01e-01 2.54e-01 2.47e-01 1.19e+00 1.34e+00   ph/cm2/s
              Error 9.74e-02 5.40e-02 3.78e-02 7.69e-02 1.56e-01 1.61e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.64e-07 1.29e-06 1.72e-06 2.88e-06 4.76e-06 6.55e-06   erg/cm2
              Error 1.25e-07 9.14e-08 1.82e-07 1.71e-06 3.89e-07 1.74e-06   erg/cm2
Peak flux Cutoff-PL 4.36e-01 4.01e-01 2.54e-01 2.46e-01 1.19e+00 1.34e+00   ph/cm2/s
              Error 9.74e-02 5.40e-02 3.79e-02 7.73e-02 1.56e-01 1.60e-01   ph/cm2/s
 
Fluence        Band 6.59e-07 1.28e-06 1.72e-06 2.89e-06 4.76e-06 6.68e-06   erg/cm2
              Error 1.24e-07 1.21e-07 1.82e-07 1.99e-06 3.88e-07 1.69e-06   erg/cm2
Peak flux      Band 4.32e-01 4.00e-01 2.55e-01 2.49e-01 1.19e+00 1.34e+00   ph/cm2/s
              Error 5.29e-02 5.06e-02 3.19e-02 7.07e-02 1.44e-01 1.60e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.596    0.131    -      -           6.44e-03 4.87e-04   45.302 57
CPL   1.232    0.511     116.7 4965.4      9.52e-03 5.56e-03   43.844  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.657    0.218    -      -           9.13e-03 1.11e-03   38.608 57
CPL   1.655    0.219    9990.8 5000.0      9.15e-03 1.11e-03   38.614 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: 33.088000 sec.
T50 in the 50-300 keV band: 21.504000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   80.000   -7.704   72.296
T90    64.000   -7.704   56.296
T50    32.000   -7.704   24.296
Peak    1.000   31.796   32.796

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  206.3524 +44.0798 0.0133   52.8   14.9       6.6036    14.5  TRIG_00306754       
------------------------------------------
 
Foreground time interval of the image:
 -7.704  72.296 (delta_t =  80.000 [sec])
Background time interval of the image:
-119.704  -7.704 (delta_t = 112.000 [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   -7.704 sec. to   72.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59608     ( -0.130590   0.130883 )
Norm@50keV  : 6.436566E-03    ( -4.866626E-04   4.864959E-04) )
------------------------------------------------------------
 Chi-Squared =      45.30190     using    59 PHA bins.
 Reduced chi-squared =     0.7947702     for     57 degrees of freedom
 Null hypothesis probability = 0.868
 
Photon flux (15-150 keV)    in 80.00 sec: 0.826130 ( -0.06877  0.069104 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.81804e-06 ( -3.76272e-07  3.77248e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -7.704 sec. to   72.296 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.23246     ( -0.571006   0.451137 )
Epeak [keV] : 116.735      ( -47.5338 9883.26 )
Norm@50keV  : 9.520250E-03    ( -3.401486E-03   7.717182E-03) )
------------------------------------------------------------
 Chi-Squared =      43.84436     using    59 PHA bins.
 but latest trial   48.7131     gives Chi-Squared =   24.8799
 Reduced chi-squared =     0.7829350     for     56 degrees of freedom
 Null hypothesis probability = 0.881
 
Photon flux (15-150 keV)    in 80.00 sec: 0.811693 ( -0.071607  0.07192 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.76452e-06 ( -3.89296e-07  3.87744e-07 ) ergs/cm2
 
Band function
Time interval is from   -7.704 sec. to   72.296 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.23388   ( -0.449710   0.572490 )
beta        : -9.17297    ( -0.827028   7.66613 )
Epeak [keV] : 116.861      ( -41.5175 9883.14 )
Norm@50keV   : 9.507015E-03    ( -3.389475E-03   7.731445E-03) )
------------------------------------------------------------
 Chi-Squared =      43.84436     using    59 PHA bins.
 Reduced chi-squared =     0.7971702     for     55 degrees of freedom
 Null hypothesis probability = 0.860
 
Photon flux (15-150 keV)    in 80.00 sec: 0.811687 ( -0.071637  0.071959 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.761e-06 ( -3.8972e-07  3.86968e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   24.296 sec. to   40.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65697     ( -0.216089   0.219163 )
Norm@50keV  : 9.129791E-03    ( -1.109555E-03   1.104875E-03) )
------------------------------------------------------------
 Chi-Squared =      38.60798     using    59 PHA bins.
 Reduced chi-squared =     0.6773329     for     57 degrees of freedom
 Null hypothesis probability = 0.971
 
Photon flux (15-150 keV)    in 16.00 sec: 1.19488 ( -0.15582  0.15682 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.35794e-06 ( -1.71421e-07  1.71315e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   24.296 sec. to   40.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65527     ( -0.217486   0.220380 )
Epeak [keV] : 9990.76      ( -9990.75 9.23633 )
Norm@50keV  : 9.149107E-03    ( -1.114306E-03   1.109007E-03) )
------------------------------------------------------------
 Chi-Squared =      38.61352     using    59 PHA bins.
 Reduced chi-squared =     0.6895271     for     56 degrees of freedom
 Null hypothesis probability = 0.963
 
Photon flux (15-150 keV)    in 16.00 sec: 1.19440 ( -0.15576  0.15676 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.35797e-06 ( -1.71086e-07  1.71758e-07 ) ergs/cm2
 
Band function
Time interval is from   24.296 sec. to   40.296 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.33361   ( -8.66640   6.33361 )
beta        : -1.65694    ( -0.223154   0.216233 )
Epeak [keV] : 24.3873      ( -24.2873 9975.61 )
Norm@50keV   : 2.010627E-02    ( -1.121128E-02   4.18266 )
------------------------------------------------------------
 Chi-Squared =      38.60798     using    59 PHA bins.
 Reduced chi-squared =     0.7019633     for     55 degrees of freedom
 Null hypothesis probability = 0.954
 
Photon flux (15-150 keV)    in 16.00 sec: 1.19304 ( -0.14279  0.14583 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.53682e-06 ( -6.50336e-07  5.93312e-07 ) ergs/cm2
 
Plot creation:
Wed Mar 19 10:45:43 EDT 2008