batgrbproduct Analysis for Trigger=228581

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Jan  2 03:54:19 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger228581/GCN5_download_cron
======================================================================

  Trigger: 00228581      Segment: 000

  BAT Trigger Time: 179398643.776   [s; MET]
      Trigger Stop: 179398644.8   [s; MET]
               UTC: 2006-09-08T08:57:22.344940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 31.8346478600979   Dec: 0.370562530869732  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.73
     Image Trigger?:     NO
     Rate S/N Ratio:     16.5227116418583  [ if not an image trigger ]
     Image S/N Ratio:    8.73

  Flight Position:   [ source = BAT ]
    RA: 31.8346478600979   Dec: 0.370562530869732  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 31.8250270053575   Dec: 0.332849347926447  [deg; J2000]  
        { 02h 07m 18.0s , +00d 19' 58.3" }
         +/- 1.12514064526261 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.310347084994889 [arcmin] (formal 1-sigma fit error)
    SNR: 25.7019331109616
    RA  =   2h  7m 18.0s  (31.825027 deg.)
    Dec =   0d 19' 58" (0.332849 deg.)
 
  Angular difference between Flight and Ground position is 2.335258 arcmin
 
  Partial Coding Fraction: 0.4609375    [ including projection effects ]

  Duration
     T90: 19.2800000011921 +/- 1.33033529343473
        Measured from: -8.04399999976158
                   to: 11.2360000014305     [s; relative to TRIGTIME]
     T50: 7.41200000047684 +/- 0.67679242593042
        Measured from: -4.81599998474121
                   to: 2.59600001573563     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.967999994754791     
                   to: 1.96799999475479     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -12.9799999892712     
                   to: 15.5119999945164     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.967546   1.591687   1.358001   0.341462
           0.041852   0.044763   0.041455   0.034019 [error]
 Peak      0.064623   0.142123   0.147463   0.035850
           0.008623   0.010144   0.009702   0.007384 [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 3.25e-07 6.54e-07 1.03e-06 3.55e-06 2.86e-06 5.56e-06   erg/cm2
              Error 2.24e-08 2.62e-08 4.10e-08 3.29e-07 1.02e-07 3.49e-07   erg/cm2
Peak flux Power-law 7.30e-01 9.53e-01 9.12e-01 1.55e+00 3.11e+00 4.14e+00   ph/cm2/s
              Error 1.08e-01 8.77e-02 7.40e-02 2.62e-01 2.41e-01 3.31e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.96e-07 6.70e-07 1.06e-06 2.20e-06 2.80e-06 3.99e-06   erg/cm2
              Error 2.89e-08 2.90e-08 4.89e-08 6.99e-07 1.11e-07 0.00e+00   erg/cm2
Peak flux Cutoff-PL 5.77e-01 1.01e+00 1.02e+00 7.28e-01 3.03e+00 3.34e+00   ph/cm2/s
              Error 1.35e-01 1.02e-01 1.01e-01 3.26e-01 2.46e-01 4.00e-01   ph/cm2/s
 
Fluence        Band 2.92e-07 6.68e-07 1.06e-06 2.18e-06 2.80e-06 4.07e-06   erg/cm2
              Error 2.86e-08 2.89e-08 4.89e-08 7.00e-07 1.11e-07 0.00e+00   erg/cm2
Peak flux      Band 5.77e-01 1.01e+00 1.02e+00 7.29e-01 3.03e+00 3.34e+00   ph/cm2/s
              Error 1.35e-01 1.02e-01 1.01e-01 3.26e-01 2.47e-01 4.00e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.351    0.063    -      -           1.03e-02 3.45e-04   50.695 57
CPL   0.967    0.269     150.7  112.4      1.53e-02 4.28e-03   44.180 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.063    0.124    -      -           2.69e-02 2.03e-03   62.145 57
CPL   0.134    0.614     115.2   57.1      7.03e-02 4.76e-02   53.671 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: 17.728000 sec.
T50 in the 50-300 keV band: 6.528000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   28.492  -12.980   15.512
T90    19.280   -8.044   11.236
T50     7.412   -4.816    2.596
Peak    1.000    0.968    1.968

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   31.8250  +0.3328 0.0075   26.4   89.2       4.0430    25.7  TRIG_00228581       
------------------------------------------
 
Foreground time interval of the image:
-12.980  11.125 (delta_t =  24.105 [sec])
Background time interval of the image:
-19.575 -12.980 (delta_t =   6.595 [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  -12.980 sec. to   15.512 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.35084     ( -6.269789E-02   6.253505E-02) )
Norm@50keV  : 1.026389E-02    ( -3.454331E-04   3.454071E-04) )
------------------------------------------------------------
 Chi-Squared =      50.69486     using    59 PHA bins.
 Reduced chi-squared =     0.8893835     for     57 degrees of freedom
 Null hypothesis probability = 0.709
 
Photon flux (15-150 keV)    in 28.49 sec: 1.23672 ( -0.04525  0.04537 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85552e-06 ( -1.02108e-07  1.02308e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -12.980 sec. to   15.512 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.966914     ( -0.277978   0.259745 )
Epeak [keV] : 150.720      ( -40.7768 184.105 )
Norm@50keV  : 1.532123E-02    ( -3.557487E-03   4.995271E-03) )
------------------------------------------------------------
 Chi-Squared =      44.18022     using    59 PHA bins.
 Reduced chi-squared =     0.7889325     for     56 degrees of freedom
 Null hypothesis probability = 0.873
 
Photon flux (15-150 keV)    in 28.49 sec: 1.20881 ( -0.04864  0.04869 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.79857e-06 ( -1.11877e-07  1.10373e-07 ) ergs/cm2
 
Band function
Time interval is from  -12.980 sec. to   15.512 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.896498   ( -0.309680   0.442182 )
beta        : -1.67553    ( -8.32447   0.267816 )
Epeak [keV] : 130.500      ( -61.6784 170.105 )
Norm@50keV   : 1.669905E-02    ( -4.714993E-03   1.869747E-02) )
------------------------------------------------------------
 Chi-Squared =      43.79589     using    59 PHA bins.
 Reduced chi-squared =     0.7962889     for     55 degrees of freedom
 Null hypothesis probability = 0.861
 
Photon flux (15-150 keV)    in 28.49 sec: 1.20483 ( -0.04969  0.04953 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.7952e-06 ( -1.10293e-07  1.11752e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.968 sec. to    1.968 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.06330     ( -0.125100   0.123054 )
Norm@50keV  : 2.689372E-02    ( -2.027854E-03   2.024967E-03) )
------------------------------------------------------------
 Chi-Squared =      62.14478     using    59 PHA bins.
 Reduced chi-squared =      1.090259     for     57 degrees of freedom
 Null hypothesis probability = 0.298
 
Photon flux (15-150 keV)    in 1.000 sec: 3.10937 ( -0.24044  0.24075 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.84631e-07 ( -2.2912e-08  2.2904e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.968 sec. to    1.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.134225     ( -0.659302   0.567713 )
Epeak [keV] : 115.152      ( -26.0948 88.0911 )
Norm@50keV  : 7.028871E-02    ( -3.059989E-02   6.452785E-02) )
------------------------------------------------------------
 Chi-Squared =      53.67133     using    59 PHA bins.
 Reduced chi-squared =     0.9584165     for     56 degrees of freedom
 Null hypothesis probability = 0.564
 
Photon flux (15-150 keV)    in 1.000 sec: 3.03170 ( -0.24677  0.24599 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.76459e-07 ( -2.4355e-08  2.4427e-08 ) ergs/cm2
 
Band function
Time interval is from    0.968 sec. to    1.968 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.134908   ( -0.567018   0.660227 )
beta        : -9.35186    ( -0.648139   11.2066 )
Epeak [keV] : 115.185      ( -26.1464 88.0100 )
Norm@50keV   : 7.024035E-02    ( -3.055191E-02   6.462802E-02) )
------------------------------------------------------------
 Chi-Squared =      53.67140     using    59 PHA bins.
 Reduced chi-squared =     0.9758436     for     55 degrees of freedom
 Null hypothesis probability = 0.525
 
Photon flux (15-150 keV)    in 1.000 sec: 3.03176 ( -0.24681  0.2462 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.76497e-07 ( -2.4528e-08  2.42e-08 ) ergs/cm2
 
Plot creation:
Wed Jan  2 04:16:47 EST 2008