batgrbproduct Analysis for Trigger=280450

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Thu Dec 13 23:53:07 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger280450/GCN5_download_cron
======================================================================

  Trigger: 00280450      Segment: 000

  BAT Trigger Time: 201863064   [s; MET]
      Trigger Stop: 201863192   [s; MET]
               UTC: 2007-05-26T09:04:22.020020    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 291.970572404101   Dec: 6.68704249799701  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    13.28
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    13.28

  Flight Position:   [ source = BAT ]
    RA: 291.970572404101   Dec: 6.68704249799701  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 291.970286578674   Dec: 6.7203664202251  [deg; J2000]  
        { 19h 27m 52.9s , +06d 43' 13.3" }
         +/- 1.82679524119517 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.693400326042521 [arcmin] (formal 1-sigma fit error)
    SNR: 12.8610286672529
    RA  =  19h 27m 52.9s  (291.970287 deg.)
    Dec =   6d 43' 13" (6.720366 deg.)
 
  Angular difference between Flight and Ground position is 1.999508 arcmin
 
  Partial Coding Fraction: 0.546875    [ including projection effects ]

  Duration
     T90: 128 +/- 
        Measured from: 0
                   to: 128     [s; relative to TRIGTIME]
     T50: 128 +/- 
        Measured from: 0
                   to: 128     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 128 second)
        Measured from: 0     
                   to: 128     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 128     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.017353   0.811215   0.104010   0.034024
           0.077697   0.076889   0.066722   0.057720 [error]
 Peak      1.017353   0.811215   0.104010   0.034024
           0.077697   0.076889   0.066722   0.057720 [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 3.46e-07 3.10e-07 1.91e-07 1.79e-07 9.22e-07 1.02e-06   erg/cm2
              Error 4.83e-08 4.17e-08 5.42e-08 9.46e-08 1.28e-07 1.78e-07   erg/cm2
Peak flux Power-law 8.94e-02 4.48e-02 1.38e-02 5.42e-03 1.51e-01 1.53e-01   ph/cm2/s
              Error 1.28e-02 5.78e-03 3.79e-03 2.69e-03 1.69e-02 1.71e-02   ph/cm2/s
 
Fluence   Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
 
Fluence        Band 3.31e-07 3.36e-07 1.48e-07 5.89e-08 8.51e-07 8.78e-07   erg/cm2
              Error 5.20e-08 4.76e-08 4.26e-08 7.79e-08 1.41e-07 2.04e-07   erg/cm2
Peak flux      Band 8.55e-02 4.89e-02 1.11e-02 1.99e-03 1.47e-01 1.48e-01   ph/cm2/s
              Error 1.36e-02 7.15e-03 2.61e-03 3.30e-03 1.72e-02 1.79e-02   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.698    0.273    -      -           6.78e-04 1.41e-04   66.367 57
CPL   1.459    0.000      14.4    0.0      4.42e-03 0.00e+00   64.267  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.698    0.273    -      -           6.78e-04 1.41e-04   66.367 57
CPL   1.459    0.000      14.4    0.0      4.42e-03 0.00e+00   64.267  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  128.000    0.000  128.000
T90   128.000    0.000  128.000
T50   128.000    0.000  128.000
Peak  128.000    0.000  128.000

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  291.9703  +6.7204 0.0149   26.2   56.6       2.0927    12.9  TRIG_00280450       
------------------------------------------
 
Foreground time interval of the image:
  0.000 128.000 (delta_t = 128.000 [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
Time interval is from    0.000 sec. to  128.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.69839     ( -0.259236   0.285887 )
Norm@50keV  : 6.776280E-04    ( -1.403257E-04   1.416123E-04) )
------------------------------------------------------------
 Chi-Squared =      66.36710     using    59 PHA bins.
 Reduced chi-squared =      1.164335     for     57 degrees of freedom
 Null hypothesis probability = 0.185
 
Photon flux (15-150 keV)    in 128.0 sec: 0.151085 ( -0.016854  0.016855 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.22348e-07 ( -1.25094e-07  1.30145e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to  128.000 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45917     (     )
Epeak [keV] : 14.4004      (   )
Norm@50keV  : 4.422129E-03    (     )
------------------------------------------------------------
 Chi-Squared =      64.26704     using    59 PHA bins.
 but latest trial -2.280474E-04 gives Chi-Squared =   5.44979
 Reduced chi-squared =      1.147626     for     56 degrees of freedom
 Null hypothesis probability = 0.210
 
Photon flux (15-150 keV)    in 128.0 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to  128.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.47924   ( -8.52076   0.312009 )
beta        : -6.74331    ( -6.13669   1.19495 )
Epeak [keV] : 14.1020      ( -14.0017 6.87315 )
Norm@50keV   : 4.289355E-03    ( -4.285416E-03   0.133926 )
------------------------------------------------------------
 Chi-Squared =      64.26584     using    59 PHA bins.
 Reduced chi-squared =      1.168470     for     55 degrees of freedom
 Null hypothesis probability = 0.184
 
Photon flux (15-150 keV)    in 128.0 sec: 0.146873 ( -0.017273  0.017074 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.51212e-07 ( -1.4566e-07  1.36813e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.000 sec. to  128.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.69839     ( -0.259236   0.285887 )
Norm@50keV  : 6.776280E-04    ( -1.403257E-04   1.416123E-04) )
------------------------------------------------------------
 Chi-Squared =      66.36710     using    59 PHA bins.
 Reduced chi-squared =      1.164335     for     57 degrees of freedom
 Null hypothesis probability = 0.185
 
Photon flux (15-150 keV)    in 128.0 sec: 0.151085 ( -0.016854  0.016855 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.22348e-07 ( -1.25094e-07  1.30145e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to  128.000 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45917     (     )
Epeak [keV] : 14.4004      (   )
Norm@50keV  : 4.422129E-03    (     )
------------------------------------------------------------
 Chi-Squared =      64.26704     using    59 PHA bins.
 but latest trial -2.280474E-04 gives Chi-Squared =   5.44979
 Reduced chi-squared =      1.147626     for     56 degrees of freedom
 Null hypothesis probability = 0.210
 
Photon flux (15-150 keV)    in 128.0 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to  128.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.47924   ( -8.52076   0.312009 )
beta        : -6.74331    ( -6.13669   1.19495 )
Epeak [keV] : 14.1020      ( -14.0017 6.87315 )
Norm@50keV   : 4.289355E-03    ( -4.285416E-03   0.133926 )
------------------------------------------------------------
 Chi-Squared =      64.26584     using    59 PHA bins.
 Reduced chi-squared =      1.168470     for     55 degrees of freedom
 Null hypothesis probability = 0.184
 
Photon flux (15-150 keV)    in 128.0 sec: 0.146873 ( -0.017273  0.017074 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.51212e-07 ( -1.4566e-07  1.36813e-07 ) ergs/cm2
 
Plot creation:
Fri Dec 14 00:03:08 EST 2007