batgrbproduct Analysis for Trigger=307256

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sun Mar 23 06:22:52 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger307256/GCN5_download_cron
======================================================================

  Trigger: 00307256      Segment: 000

  BAT Trigger Time: 227885058.624   [s; MET]
      Trigger Stop: 227885059.648   [s; MET]
               UTC: 2008-03-22T13:24:15.962360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 356.615296223207   Dec: -30.0913182413444  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.02
     Image Trigger?:     NO
     Rate S/N Ratio:     11  [ if not an image trigger ]
     Image S/N Ratio:    6.02

  Flight Position:   [ source = BAT ]
    RA: 356.615296223207   Dec: -30.0913182413444  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 356.67446350238   Dec: -30.0856837364644  [deg; J2000]  
        { 23h 46m 41.9s , -30d 05' 08.5" }
         +/- 4.24964236212713 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.16212434120708 [arcmin] (formal 1-sigma fit error)
    SNR: 3.85010096985303
    RA  =  23h 46m 41.9s  (356.674464 deg.)
    Dec =  -30d  5'  8" (-30.085684 deg.)
 
  Angular difference between Flight and Ground position is 3.090225 arcmin
 
  Partial Coding Fraction: 0.546875    [ including projection effects ]

  Duration
     T90: 1.02399998903275 +/- 
        Measured from: 0
                   to: 1.02399998903275     [s; relative to TRIGTIME]
     T50: 1.02399998903275 +/- 
        Measured from: 0
                   to: 1.02399998903275     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 1.02399998903275 second)
        Measured from: 0     
                   to: 1.02399998903275     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 1.02399998903275     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.001648   0.009084   0.022179   0.015892
           0.006860   0.007296   0.007179   0.007679 [error]
 Peak      0.001648   0.009084   0.022179   0.015892
           0.006860   0.007296   0.007179   0.007679 [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 1.05e-09 4.43e-09 1.55e-08 1.87e-07 4.44e-08 2.47e-07   erg/cm2
              Error 1.48e-09 2.87e-09 1.10e-08 3.04e-07 1.85e-08 3.06e-07   erg/cm2
Peak flux Power-law 3.26e-02 7.24e-02 1.27e-01 5.18e-01 3.46e-01 7.50e-01   ph/cm2/s
              Error 4.61e-02 6.85e-02 9.07e-02 5.37e-01 1.62e-01 5.02e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.36e-10 4.04e-09 1.83e-08 5.92e-08 4.46e-08 1.91e-07   erg/cm2
              Error 1.38e-09 4.20e-09 9.11e-09 2.29e-07 1.95e-08 0.00e+00   erg/cm2
Peak flux Cutoff-PL 1.60e-02 6.43e-02 1.49e-01 2.18e-01 3.37e-01 4.49e-01   ph/cm2/s
              Error 4.28e-02 6.92e-02 7.63e-02 5.76e-01 1.55e-01 4.15e-01   ph/cm2/s
 
Fluence        Band 5.52e-10 4.05e-09 1.82e-08 6.00e-08 4.46e-08 1.10e-07   erg/cm2
              Error 1.37e-09 4.19e-09 9.42e-09 2.26e-07 1.97e-08 2.40e-07   erg/cm2
Peak flux      Band 1.60e-02 6.43e-02 1.50e-01 2.17e-01 3.37e-01 4.46e-01   ph/cm2/s
              Error 4.28e-02 6.91e-02 7.85e-02 5.77e-01 1.56e-01 5.49e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.191    0.910    -      -           2.73e-03 2.19e-03   58.211  0
CPL  -1.360    1.957     159.9 5000.0      8.52e-03 4.17e-02   57.740 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.191    0.910    -      -           2.73e-03 2.19e-03   58.211  0
CPL  -1.360    1.957     159.9 5000.0      8.52e-03 4.17e-02   57.740 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    1.024    0.000    1.024
T90     1.024    0.000    1.024
T50     1.024    0.000    1.024
Peak    1.024    0.000    1.024

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  356.6745 -30.0857 0.0501   32.8  -46.4       0.0562     3.9  TRIG_00307256       
------------------------------------------
 
Foreground time interval of the image:
  0.000   1.024 (delta_t =   1.024 [sec])
Background time interval of the image:
-35.523 -10.624 (delta_t =  24.899 [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    0.000 sec. to    1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.190799     ( -1.02064   0.798499 )
Norm@50keV  : 2.727079E-03    ( -2.727079E-03   1.645660E-03) )
------------------------------------------------------------
 Chi-Squared =      58.21125     using    59 PHA bins.
 but latest trial  -1.84015     gives Chi-Squared =   2.78027
 Reduced chi-squared =      1.021250     for     57 degrees of freedom
 Null hypothesis probability = 0.431
 
Photon flux (15-150 keV)    in 1.024 sec: 0.346351 ( -0.157367  0.1658 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.44153e-08 ( -1.84483e-08  1.84852e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to    1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36000     ( -1.64000   2.27405 )
Epeak [keV] : 159.906      ( -159.896 9840.09 )
Norm@50keV  : 8.521061E-03    ( -8.521060E-03   7.492218E-02) )
------------------------------------------------------------
 Chi-Squared =      57.73982     using    59 PHA bins.
 Reduced chi-squared =      1.031068     for     56 degrees of freedom
 Null hypothesis probability = 0.411
 
Photon flux (15-150 keV)    in 1.024 sec: 0.337403 ( -0.145994  0.163419 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.45818e-08 ( -1.9924e-08  1.91344e-08 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to    1.024 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.391931   ( -9.60807   5.39193 )
beta        : -0.189385    ( -0.801004   1.01405 )
Epeak [keV] : 19.2809      ( -19.1809 9980.72 )
Norm@50keV   : 4.098692E-03    ( -4.098692E-03   21279.0 )
------------------------------------------------------------
 Chi-Squared =      58.21130     using    59 PHA bins.
 Reduced chi-squared =      1.058387     for     55 degrees of freedom
 Null hypothesis probability = 0.358
 
Photon flux (15-150 keV)    in 1.024 sec: 0.337259 ( -0.147148  0.16413 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.45889e-08 ( -2.0259e-08  1.9098e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.000 sec. to    1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.190799     ( -1.02064   0.798499 )
Norm@50keV  : 2.727079E-03    ( -2.727079E-03   1.645660E-03) )
------------------------------------------------------------
 Chi-Squared =      58.21125     using    59 PHA bins.
 but latest trial  -1.84015     gives Chi-Squared =   2.78027
 Reduced chi-squared =      1.021250     for     57 degrees of freedom
 Null hypothesis probability = 0.431
 
Photon flux (15-150 keV)    in 1.024 sec: 0.346351 ( -0.157367  0.1658 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.44153e-08 ( -1.84483e-08  1.84852e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to    1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36000     ( -1.64000   2.27405 )
Epeak [keV] : 159.906      ( -159.896 9840.09 )
Norm@50keV  : 8.521061E-03    ( -8.521060E-03   7.492218E-02) )
------------------------------------------------------------
 Chi-Squared =      57.73982     using    59 PHA bins.
 Reduced chi-squared =      1.031068     for     56 degrees of freedom
 Null hypothesis probability = 0.411
 
Photon flux (15-150 keV)    in 1.024 sec: 0.337403 ( -0.145994  0.163419 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.45818e-08 ( -1.9924e-08  1.91344e-08 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to    1.024 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.391931   ( -9.60807   5.39193 )
beta        : -0.189385    ( -0.801004   1.01405 )
Epeak [keV] : 19.2809      ( -19.1809 9980.72 )
Norm@50keV   : 4.098692E-03    ( -4.098692E-03   21279.0 )
------------------------------------------------------------
 Chi-Squared =      58.21130     using    59 PHA bins.
 Reduced chi-squared =      1.058387     for     55 degrees of freedom
 Null hypothesis probability = 0.358
 
Photon flux (15-150 keV)    in 1.024 sec: 0.337259 ( -0.147148  0.16413 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.45889e-08 ( -2.0259e-08  1.9098e-08 ) ergs/cm2
 
Plot creation:
Sun Mar 23 06:39:25 EDT 2008