batgrbproduct Analysis for Trigger=273180

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Thu Dec 13 16:28:27 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger273180/GCN5_download_cron
======================================================================

  Trigger: 00273180      Segment: 000

  BAT Trigger Time: 196987893.056   [s; MET]
      Trigger Stop: 196987894.08   [s; MET]
               UTC: 2007-03-30T22:51:31.197500    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 269.519312152181   Dec: -63.7791777282201  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.25
     Image Trigger?:     NO
     Rate S/N Ratio:     12.2065556157337  [ if not an image trigger ]
     Image S/N Ratio:    10.25

  Flight Position:   [ source = BAT ]
    RA: 269.519312152181   Dec: -63.7791777282201  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 269.556222665047   Dec: -63.8078323240761  [deg; J2000]  
        { 17h 58m 13.5s , -63d 48' 28.2" }
         +/- 1.71917847184396 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.749535107613427 [arcmin] (formal 1-sigma fit error)
    SNR: 14.0263791454957
    RA  =  17h 58m 13.5s  (269.556223 deg.)
    Dec = -63d 48' 28" (-63.807832 deg.)
 
  Angular difference between Flight and Ground position is 1.977976 arcmin
 
  Partial Coding Fraction: 0.8046875    [ including projection effects ]

  Duration
     T90: 6.63999998569489 +/- 0.679764683286021
        Measured from: -1.05599999427795
                   to: 5.58399999141693     [s; relative to TRIGTIME]
     T50: 2.73599997162819 +/- 0.621327605247016
        Measured from: 0.256000012159348
                   to: 2.99199998378754     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0279999971389771     
                   to: 0.972000002861023     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.40799999237061     
                   to: 5.71200001239777     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.121007   0.192170   0.056737   0.027545
           0.016269   0.015111   0.012587   0.010395 [error]
 Peak      0.033531   0.050491   0.016997   0.008725
           0.006348   0.005958   0.004806   0.003867 [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 4.63e-08 6.33e-08 6.39e-08 1.17e-07 2.11e-07 2.90e-07   erg/cm2
              Error 7.06e-09 7.03e-09 1.15e-08 4.10e-08 2.73e-08 5.43e-08   erg/cm2
Peak flux Power-law 3.74e-01 3.04e-01 1.67e-01 1.35e-01 9.06e-01 9.81e-01   ph/cm2/s
              Error 8.62e-02 4.76e-02 3.87e-02 5.98e-02 1.43e-01 1.54e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.12e-08 8.03e-08 4.56e-08 4.45e-09 1.71e-07 1.72e-07   erg/cm2
              Error 8.03e-09 1.11e-08 1.94e-08 1.15e-08 2.83e-08 3.03e-08   erg/cm2
Peak flux Cutoff-PL 3.27e-01 3.60e-01 1.60e-01 2.42e-02 8.68e-01 8.71e-01   ph/cm2/s
              Error 9.89e-02 7.30e-02 5.45e-02 5.85e-02 1.47e-01 1.53e-01   ph/cm2/s
 
Fluence        Band 4.18e-08 7.66e-08 5.38e-08 5.10e-08 1.86e-07 2.27e-07   erg/cm2
              Error 7.00e-09 8.80e-09 9.67e-09 2.76e-08 5.76e-08 0.00e+00   erg/cm2
Peak flux      Band 3.20e-01 3.66e-01 1.55e-01 6.70e-02 8.79e-01 9.09e-01   ph/cm2/s
              Error 1.34e-01 6.38e-02 4.26e-02 6.85e-02 1.41e-01 1.63e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.986    0.193    -      -           3.22e-03 4.33e-04   57.776 57
CPL  -0.344    1.605      37.3    6.0      8.76e-02 7.65e-01   45.631 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.862    0.270    -      -           6.41e-03 1.15e-03   56.843 57
CPL   0.366    1.752      44.9   30.5      4.76e-02 4.49e-01   53.395 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    7.120   -1.408    5.712
T90     6.640   -1.056    5.584
T50     2.736    0.256    2.992
Peak    1.000   -0.028    0.972

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  269.5562 -63.8078 0.0137   18.6  -68.8       0.3930    14.0  TRIG_00273180       
------------------------------------------
 
Foreground time interval of the image:
 -1.408   5.712 (delta_t =   7.120 [sec])
Background time interval of the image:
-239.056  -1.408 (delta_t = 237.648 [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   -1.408 sec. to    5.712 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98648     ( -0.189197   0.197007 )
Norm@50keV  : 3.216130E-03    ( -4.358857E-04   4.298147E-04) )
------------------------------------------------------------
 Chi-Squared =      57.77610     using    59 PHA bins.
 Reduced chi-squared =      1.013616     for     57 degrees of freedom
 Null hypothesis probability = 0.446
 
Photon flux (15-150 keV)    in 7.120 sec: 0.479446 ( -0.053261  0.053286 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.11044e-07 ( -2.70795e-08  2.76007e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -1.408 sec. to    5.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.343590     ( -1.92098   1.28979 )
Epeak [keV] : 37.3076      ( -4.92640 7.01741 )
Norm@50keV  : 8.760388E-02    ( -7.361760E-02   1.45592 )
------------------------------------------------------------
 Chi-Squared =      45.63055     using    59 PHA bins.
 Reduced chi-squared =     0.8148313     for     56 degrees of freedom
 Null hypothesis probability = 0.837
 
Photon flux (15-150 keV)    in 7.120 sec: 0.450832 ( -0.054346  0.054653 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.71102e-07 ( -2.62116e-08  3.04537e-08 ) ergs/cm2
 
Band function
Time interval is from   -1.408 sec. to    5.712 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.343825   ( -2.52347   1.67618 )
beta        : -2.83156    ( -0.721166   0.436476 )
Epeak [keV] : 34.9660      ( -5.45814 25.6172 )
Norm@50keV   : 9.892130E-02    ( -70.2560   16.4538 )
------------------------------------------------------------
 Chi-Squared =      43.70662     using    59 PHA bins.
 Reduced chi-squared =     0.7946658     for     55 degrees of freedom
 Null hypothesis probability = 0.863
 
Photon flux (15-150 keV)    in 7.120 sec: 0.461726 ( -0.050809  0.054011 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.85719e-07 ( -2.51001e-08  3.01824e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.032 sec. to    0.976 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.86177     ( -0.263247   0.276695 )
Norm@50keV  : 6.413600E-03    ( -1.163415E-03   1.138431E-03) )
------------------------------------------------------------
 Chi-Squared =      56.84308     using    59 PHA bins.
 Reduced chi-squared =     0.9972470     for     57 degrees of freedom
 Null hypothesis probability = 0.481
 
Photon flux (15-150 keV)    in 1.008 sec: 0.905866 ( -0.142599  0.142744 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.94245e-08 ( -1.05681e-08  1.08333e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.032 sec. to    0.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.365568     ( -2.12103   1.38229 )
Epeak [keV] : 44.9142      ( -10.3446 50.7231 )
Norm@50keV  : 4.759896E-02    ( -3.991460E-02   0.858336 )
------------------------------------------------------------
 Chi-Squared =      53.39508     using    59 PHA bins.
 Reduced chi-squared =     0.9534836     for     56 degrees of freedom
 Null hypothesis probability = 0.574
 
Photon flux (15-150 keV)    in 1.008 sec: 0.867645 ( -0.146145  0.147375 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.20024e-08 ( -1.07633e-08  1.26816e-08 ) ergs/cm2
 
Band function
Time interval is from   -0.032 sec. to    0.976 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.184545   ( -1.43434   3.67121 )
beta        : -2.56539    ( -7.43461   0.739468 )
Epeak [keV] : 41.1435      ( -14.9316 29.8574 )
Norm@50keV   : 6.706515E-02    ( -20.3026   128.891 )
------------------------------------------------------------
 Chi-Squared =      52.68235     using    59 PHA bins.
 Reduced chi-squared =     0.9578608     for     55 degrees of freedom
 Null hypothesis probability = 0.564
 
Photon flux (15-150 keV)    in 1.008 sec: 0.878600 ( -0.13863  0.14312 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.51299e-08 ( -9.87195e-09  1.17972e-08 ) ergs/cm2
 
Plot creation:
Thu Dec 13 16:51:22 EST 2007