batgrbproduct Analysis for Trigger=282225

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Fri Dec 14 02:19:04 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger282225/GCN5_download_cron
======================================================================

  Trigger: 00282225      Segment: 000

  BAT Trigger Time: 203460127.808   [s; MET]
      Trigger Stop: 203460129.856   [s; MET]
               UTC: 2007-06-13T20:42:05.788200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 299.596939731123   Dec: 35.2773962149263  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    8.59
     Image Trigger?:     NO
     Rate S/N Ratio:     11.0905365064094  [ if not an image trigger ]
     Image S/N Ratio:    8.59

  Flight Position:   [ source = BAT ]
    RA: 299.596939731123   Dec: 35.2773962149263  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 299.602478947692   Dec: 35.2648052792066  [deg; J2000]  
        { 19h 58m 24.6s , +35d 15' 53.3" }
         +/- 2.49772223249668 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.14474202273111 [arcmin] (formal 1-sigma fit error)
    SNR: 8.22617947686824
    RA  =  19h 58m 24.6s  (299.602479 deg.)
    Dec =  35d 15' 53" (35.264805 deg.)
 
  Angular difference between Flight and Ground position is 0.802708 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 1.98399996757507 +/- 0.403821742918092
        Measured from: 0.00800001621246338
                   to: 1.99199998378754     [s; relative to TRIGTIME]
     T50: 1.23199996352196 +/- 0.531864647339814
        Measured from: 0.488000005483627
                   to: 1.71999996900558     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.09999999403954     
                   to: 2.09999999403954     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0879999995231628     
                   to: 2.19999998807907     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.092312   0.087890   0.042222   0.010500
           0.008130   0.008052   0.007141   0.006505 [error]
 Peak      0.038153   0.047128   0.017242   0.011068
           0.005308   0.005393   0.004793   0.004319 [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 2.44e-08 3.49e-08 3.71e-08 7.31e-08 1.19e-07 1.75e-07   erg/cm2
              Error 3.76e-09 3.65e-09 6.79e-09 2.70e-08 1.54e-08 3.45e-08   erg/cm2
Peak flux Power-law 3.54e-01 2.90e-01 1.61e-01 1.31e-01 8.63e-01 9.36e-01   ph/cm2/s
              Error 7.44e-02 4.16e-02 3.84e-02 6.08e-02 1.24e-01 1.39e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.42e-08 3.56e-08 3.68e-08 5.48e-08 1.17e-07 1.51e-07   erg/cm2
              Error 3.97e-09 3.61e-09 7.39e-09 5.11e-08 1.42e-08 4.94e-08   erg/cm2
Peak flux Cutoff-PL 3.44e-01 3.04e-01 1.59e-01 7.22e-02 8.51e-01 8.80e-01   ph/cm2/s
              Error 8.11e-02 5.89e-02 4.57e-02 9.76e-02 9.73e-02 1.69e-01   ph/cm2/s
 
Fluence        Band 2.37e-08 3.65e-08 3.54e-08 6.10e-08 1.16e-07 1.54e-07   erg/cm2
              Error 4.39e-09 5.11e-09 7.79e-09 3.30e-08 1.66e-08 3.91e-08   erg/cm2
Peak flux      Band 3.33e-01 3.21e-01 1.49e-01 9.02e-02 8.48e-01 8.94e-01   ph/cm2/s
              Error 8.29e-02 5.80e-02 4.51e-02 6.89e-02 1.27e-01 1.48e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.912    0.205    -      -           5.67e-03 7.42e-04   51.839 57
CPL   1.768    0.665      65.5 5000.0      6.90e-03 1.15e-02   51.754  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.849    0.274    -      -           6.14e-03 1.10e-03   39.875 57
CPL   1.448    1.169      55.9 5000.0      1.06e-02 5.11e-02   39.554  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    2.288   -0.088    2.200
T90     1.984    0.008    1.992
T50     1.232    0.488    1.720
Peak    1.000    1.100    2.100

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  299.6025 +35.2648 0.0235    9.1 -129.6       0.1350     8.2  TRIG_00282225       
------------------------------------------
 
Foreground time interval of the image:
 -0.088   2.200 (delta_t =   2.288 [sec])
Background time interval of the image:
-10.808  -0.088 (delta_t =  10.720 [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   -0.088 sec. to    2.200 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.91190     ( -0.200900   0.208887 )
Norm@50keV  : 5.671832E-03    ( -7.513147E-04   7.332014E-04) )
------------------------------------------------------------
 Chi-Squared =      51.83945     using    59 PHA bins.
 Reduced chi-squared =     0.9094640     for     57 degrees of freedom
 Null hypothesis probability = 0.668
 
Photon flux (15-150 keV)    in 2.288 sec: 0.818109 ( -0.085248  0.085263 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.19294e-07 ( -1.51644e-08  1.56161e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.088 sec. to    2.200 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76792     ( -0.884719   0.445864 )
Epeak [keV] : 65.5394      ( -65.5294 9934.46 )
Norm@50keV  : 6.896179E-03    ( -6.896179E-03   1.615581E-02) )
------------------------------------------------------------
 Chi-Squared =      51.75422     using    59 PHA bins.
 but latest trial   2.21379     gives Chi-Squared =   1.04450
 Reduced chi-squared =     0.9241825     for     56 degrees of freedom
 Null hypothesis probability = 0.636
 
Photon flux (15-150 keV)    in 2.288 sec: 0.813520 ( -0.044612  0.086438 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.1719e-07 ( -1.91087e-08  9.19845e-09 ) ergs/cm2
 
Band function
Time interval is from   -0.088 sec. to    2.200 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.919597   ( -10.5804   3.50152 )
beta        : -2.04871    ( -0.350031   0.302675 )
Epeak [keV] : 32.5104      ( -27.3368 823.432 )
Norm@50keV   : 2.727255E-02    ( -268.877   480.439 )
------------------------------------------------------------
 Chi-Squared =      50.68098     using    59 PHA bins.
 Reduced chi-squared =     0.9214723     for     55 degrees of freedom
 Null hypothesis probability = 0.640
 
Photon flux (15-150 keV)    in 2.288 sec: 0.811902 ( -0.08574  0.09067 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16145e-07 ( -1.6329e-08  1.6901e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    1.096 sec. to    2.104 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.84906     ( -0.265315   0.282539 )
Norm@50keV  : 6.141920E-03    ( -1.121162E-03   1.084851E-03) )
------------------------------------------------------------
 Chi-Squared =      39.87527     using    59 PHA bins.
 Reduced chi-squared =     0.6995661     for     57 degrees of freedom
 Null hypothesis probability = 0.959
 
Photon flux (15-150 keV)    in 1.008 sec: 0.862981 ( -0.12385  0.123856 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.68927e-08 ( -1.01096e-08  1.05296e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.096 sec. to    2.104 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.44754     ( -1.60383   0.733860 )
Epeak [keV] : 55.8989      ( -55.8889 9944.10 )
Norm@50keV  : 1.062152E-02    ( -1.062152E-02   9.153246E-02) )
------------------------------------------------------------
 Chi-Squared =      39.55443     using    59 PHA bins.
 but latest trial   2.18140     gives Chi-Squared =   45.7754
 Reduced chi-squared =     0.7063290     for     56 degrees of freedom
 Null hypothesis probability = 0.953
 
Photon flux (15-150 keV)    in 1.008 sec: 0.851063 ( -0.129931  0.064596 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.42235e-08 ( -1.28981e-08  1.25312e-08 ) ergs/cm2
 
Band function
Time interval is from    1.096 sec. to    2.104 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.558733   ( -9.52127   4.26527 )
beta        : -2.17958    ( -7.81625   0.526745 )
Epeak [keV] : 37.6162      ( -37.2551 9962.64 )
Norm@50keV   : 4.201235E-02    ( -4.740009E-02   353.061 )
------------------------------------------------------------
 Chi-Squared =      38.58374     using    59 PHA bins.
 Reduced chi-squared =     0.7015225     for     55 degrees of freedom
 Null hypothesis probability = 0.954
 
Photon flux (15-150 keV)    in 1.008 sec: 0.847563 ( -0.127744  0.126016 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.36102e-08 ( -1.11777e-08  1.15277e-08 ) ergs/cm2
 
Plot creation:
Fri Dec 14 02:24:44 EST 2007