batgrbproduct Analysis for Trigger=308797

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Apr  9 12:42:23 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger308797/GCN5_download_cron
======================================================================

  Trigger: 00308797      Segment: 000

  BAT Trigger Time: 229382896   [s; MET]
      Trigger Stop: 229383216   [s; MET]
               UTC: 2008-04-08T21:28:13.296660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 264.841713908155   Dec: -30.3656230660562  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    7.83
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.83

  Flight Position:   [ source = BAT ]
    RA: 264.841713908155   Dec: -30.3656230660562  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 264.873522780921   Dec: -30.3003980532069  [deg; J2000]  
        { 17h 39m 29.6s , -30d 18' 01.4" }
         +/- 3.63312750453367 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.36002677387066 [arcmin] (formal 1-sigma fit error)
    SNR: 4.81634364482239
    RA  =  17h 39m 29.6s  (264.873523 deg.)
    Dec =  -30d 18'  1" (-30.300398 deg.)
 
  Angular difference between Flight and Ground position is 4.246053 arcmin
 
  Partial Coding Fraction: 1.03125    [ including projection effects ]

  Duration
     T90: 320 +/- 0.004
        Measured from: 0
                   to: 320     [s; relative to TRIGTIME]
     T50: 320 +/- 0.004
        Measured from: 0
                   to: 320     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 320 second)
        Measured from: 0     
                   to: 320     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 320     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.637311   0.449114   0.161080   0.098520
           0.095742   0.084713   0.070523   0.058842 [error]
 Peak      0.637311   0.449114   0.161080   0.098520
           0.095742   0.084713   0.070523   0.058842 [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 1.81e-07 1.88e-07 1.39e-07 1.64e-07 5.71e-07 6.74e-07   erg/cm2
              Error 4.20e-08 4.02e-08 5.68e-08 1.28e-07 1.36e-07 2.12e-07   erg/cm2
Peak flux Power-law 1.86e-02 1.08e-02 3.98e-03 1.94e-03 3.45e-02 3.54e-02   ph/cm2/s
              Error 4.42e-03 2.24e-03 1.58e-03 1.84e-03 6.54e-03 6.78e-03   ph/cm2/s
 
Fluence   Cutoff-PL 1.81e-07 2.16e-07 6.87e-08 3.42e-09 4.69e-07 4.69e-07   erg/cm2
              Error 4.64e-08 5.44e-08 8.57e-08 1.12e-07 1.49e-07 2.13e-07   erg/cm2
Peak flux Cutoff-PL 1.83e-02 1.26e-02 2.15e-03 5.86e-05 3.31e-02 3.31e-02   ph/cm2/s
              Error 4.76e-03 3.05e-03 2.47e-03 1.30e-03 6.61e-03 6.62e-03   ph/cm2/s
 
Fluence        Band 1.83e-07 2.10e-07 8.11e-08 4.11e-08 4.98e-07 5.98e-07   erg/cm2
              Error 4.71e-08 4.82e-08 7.08e-08 6.07e-08 1.08e-07 0.00e+00   erg/cm2
Peak flux      Band 1.84e-02 1.20e-02 3.28e-03 1.04e-03 3.43e-02 3.48e-02   ph/cm2/s
              Error 4.21e-03 2.28e-03 1.75e-03 1.25e-03 6.47e-03 6.87e-03   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.442    0.398    -      -           1.82e-04 5.51e-05   44.076 57
CPL   1.480    0.000      17.0   21.4      8.37e-04 0.00e+00   42.335  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.442    0.398    -      -           1.82e-04 5.51e-05   44.076 57
CPL   1.480    0.000      17.0   21.4      8.37e-04 0.00e+00   42.335  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  320.000    0.000  320.000
T90   320.000    0.000  320.000
T50   320.000    0.000  320.000
Peak  320.000    0.000  320.000

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  264.8735 -30.3004 0.0393   11.7 -157.3       1.2382     4.8  TRIG_00308797       
------------------------------------------
 
Foreground time interval of the image:
  0.000 178.230 (delta_t = 178.230 [sec])
179.000 320.000 (delta_t = 141.000 [sec])
Background time interval of the image:

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
Multiple GTIs in the spectrum
tstart tstop
0.000000 178.230000
179.000000 320.000000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.44250     ( -0.373857   0.421217 )
Norm@50keV  : 1.816250E-04    ( -5.496865E-05   5.529790E-05) )
------------------------------------------------------------
 Chi-Squared =      44.07636     using    59 PHA bins.
 Reduced chi-squared =     0.7732695     for     57 degrees of freedom
 Null hypothesis probability = 0.895
 
Photon flux (15-150 keV)    in 319.2 sec: 3.446100E-02 ( -0.00654058  0.00654151 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.71208e-07 ( -1.31574e-07  1.40011e-07 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 178.230000
179.000000 320.000000
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.47955     (     )
Epeak [keV] : 17.0264      ( -25.0697 17.6361 )
Norm@50keV  : 8.374729E-04    (     )
------------------------------------------------------------
 Chi-Squared =      42.33462     using    59 PHA bins.
 but latest trial   49.9202     gives Chi-Squared =   5.76014
 Reduced chi-squared =     0.7559753     for     56 degrees of freedom
 Null hypothesis probability = 0.911
 
Photon flux (15-150 keV)    in 319.2 sec: 3.308998E-02 ( -0.00661972  0.00660459 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.6893e-07 ( -1.2678e-07  1.72049e-07 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 178.230000
179.000000 320.000000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.36417   ( -8.63583   6.36417 )
beta        : -3.83212    ( -6.16788   1.63714 )
Epeak [keV] : 19.7710      ( -19.6710 24.8076 )
Norm@50keV   : 9.371351E-04    ( -2.65333   33.9445 )
------------------------------------------------------------
 Chi-Squared =      42.25825     using    59 PHA bins.
 Reduced chi-squared =     0.7683318     for     55 degrees of freedom
 Null hypothesis probability = 0.896
 
Photon flux (15-150 keV)    in 319.2 sec: 3.433717E-02 ( -0.00640991  0.0065359 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.97891e-07 ( -1.20364e-07  9.4879e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  179.000 sec. to  320.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.44250     ( -0.373857   0.421217 )
Norm@50keV  : 1.816250E-04    ( -5.496865E-05   5.529790E-05) )
------------------------------------------------------------
 Chi-Squared =      44.07636     using    59 PHA bins.
 Reduced chi-squared =     0.7732695     for     57 degrees of freedom
 Null hypothesis probability = 0.895
 
Photon flux (15-150 keV)    in 319.2 sec: 3.446100E-02 ( -0.00654058  0.00654151 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.71208e-07 ( -1.31574e-07  1.40011e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  179.000 sec. to  320.000 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.47955     (     )
Epeak [keV] : 17.0264      ( -25.0697 17.6361 )
Norm@50keV  : 8.374729E-04    (     )
------------------------------------------------------------
 Chi-Squared =      42.33462     using    59 PHA bins.
 but latest trial   49.9202     gives Chi-Squared =   5.76014
 Reduced chi-squared =     0.7559753     for     56 degrees of freedom
 Null hypothesis probability = 0.911
 
Photon flux (15-150 keV)    in 319.2 sec: 3.308998E-02 ( -0.00661972  0.00660459 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.6893e-07 ( -1.2678e-07  1.72049e-07 ) ergs/cm2
 
Band function
Time interval is from  179.000 sec. to  320.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.36417   ( -8.63583   6.36417 )
beta        : -3.83212    ( -6.16788   1.63714 )
Epeak [keV] : 19.7710      ( -19.6710 24.8076 )
Norm@50keV   : 9.371351E-04    ( -2.65333   33.9445 )
------------------------------------------------------------
 Chi-Squared =      42.25825     using    59 PHA bins.
 Reduced chi-squared =     0.7683318     for     55 degrees of freedom
 Null hypothesis probability = 0.896
 
Photon flux (15-150 keV)    in 319.2 sec: 3.433717E-02 ( -0.00640991  0.0065359 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.97891e-07 ( -1.20364e-07  9.4879e-08 ) ergs/cm2
 
Plot creation:
Wed Apr  9 13:27:08 EDT 2008