batgrbproduct Analysis for Trigger=147918

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Tue Jan  8 13:49:52 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger147918/SDC
======================================================================

  Trigger: 00147918      Segment: 000

  BAT Trigger Time: 144138704   [s; MET]
      Trigger Stop: 144138768   [s; MET]
               UTC: 2005-07-27T06:31:44.357120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 238.256113857521   Dec: -21.7678288860753  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.98
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.98

  Flight Position:   [ source = BAT ]
    RA: 238.256113857521   Dec: -21.7678288860753  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 238.293215697152   Dec: -21.7601480611204  [deg; J2000]  
        { 15h 53m 10.4s , -21d 45' 36.5" }
         +/- 2.5724150785818 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.17166020317414 [arcmin] (formal 1-sigma fit error)
    SNR: 7.88709160241385
    RA  =  15h 53m 10.4s  (238.293216 deg.)
    Dec = -21d 45' 37" (-21.760148 deg.)
 
  Angular difference between Flight and Ground position is 2.118172 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 35.3000000119209 +/- 14.1357560654549
        Measured from: 0.0679999887943268
                   to: 35.3680000007153     [s; relative to TRIGTIME]
     T50: 13.8040000200272 +/- 10.2880932910703
        Measured from: 14.5239999890327
                   to: 28.3280000090599     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 26.1719999909401     
                   to: 27.1719999909401     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.21999999880791     
                   to: 36.4480000138283     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.687125   0.100089   0.027461   0.011480
           0.062039   0.059289   0.050530   0.043709 [error]
 Peak      0.014473   0.034232   0.014919   0.006913
           0.009939   0.009562   0.008512   0.006544 [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 2.50e-07 5.82e-08 6.95e-09 9.23e-10 3.16e-07 3.16e-07   erg/cm2
              Error 4.38e-08 2.91e-08 8.29e-09 2.23e-09 6.51e-08 6.55e-08   erg/cm2
Peak flux Power-law 3.21e-01 2.07e-01 8.65e-02 4.93e-02 6.39e-01 6.63e-01   ph/cm2/s
              Error 1.76e-01 8.73e-02 6.67e-02 8.18e-02 2.53e-01 2.65e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.50e-07 5.52e-08 4.71e-09 6.89e-11 3.06e-07 3.15e-07   erg/cm2
              Error 4.40e-08 2.63e-08 4.76e-08 6.85e-08 0.00e+00 0.00e+00   erg/cm2
Peak flux Cutoff-PL 3.21e-01 2.07e-01 8.64e-02 4.89e-02 6.39e-01 6.63e-01   ph/cm2/s
              Error 1.76e-01 8.74e-02 6.67e-02 8.13e-02 2.53e-01 2.64e-01   ph/cm2/s
 
Fluence        Band 2.47e-07 5.81e-08 7.00e-09 9.36e-10 3.14e-07 3.14e-07   erg/cm2
              Error 4.32e-08 1.52e-08 1.46e-08 2.86e-10 5.71e-08 5.69e-07   erg/cm2
Peak flux      Band 3.13e-01 2.15e-01 8.40e-02 4.34e-02 6.35e-01 6.56e-01   ph/cm2/s
              Error 1.65e-01 1.04e-01 6.55e-02 5.51e-02 2.52e-01 2.66e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    4.856    0.917    -      -           1.88e-04 1.71e-04   50.447 57
CPL   1.884    0.898       0.8    4.0      6.72e-02 4.86e+02   50.042  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.259    0.968    -      -           3.74e-03 2.23e-03   58.365 57
CPL   1.993    0.348       1.3    0.0      5.14e-03 2.93e-03   58.448  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   39.668   -3.220   36.448
T90    35.300    0.068   35.368
T50    13.804   14.524   28.328
Peak    1.000   26.172   27.172

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  238.2932 -21.7601 0.0245   34.6   57.3       0.9531     7.9  TRIG_00147918       
------------------------------------------
 
Foreground time interval of the image:
 -3.220  36.448 (delta_t =  39.668 [sec])
Background time interval of the image:
-299.000  -3.220 (delta_t = 295.780 [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   -3.220 sec. to   36.448 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.85567     ( -0.622492   1.21247 )
Norm@50keV  : 1.875773E-04    ( -1.875773E-04   1.546634E-04) )
------------------------------------------------------------
 Chi-Squared =      50.44669     using    59 PHA bins.
 Reduced chi-squared =     0.8850296     for     57 degrees of freedom
 Null hypothesis probability = 0.718
 
Photon flux (15-150 keV)    in 39.67 sec: 0.250354 ( -0.0448  0.044879 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.16289e-07 ( -6.3501e-08  6.67495e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -3.220 sec. to   36.448 sec.
Photon index: 1.88381     ( -0.638750   1.15785 )
Epeak [keV] : 0.751451      ( -0.555074 7.47452 )
Norm@50keV  : 6.724685E-02    ( -6.724685E-02   971.701 )
------------------------------------------------------------
 Chi-Squared =      50.04182     using    59 PHA bins.
 but latest trial   1.24506     gives Chi-Squared =  6.639862E-02
 but latest trial -0.732063     gives Chi-Squared =   0.00000
 but latest trial   8.22597     gives Chi-Squared =  0.342190
 Reduced chi-squared =     0.8936039     for     56 degrees of freedom
 Null hypothesis probability = 0.699
 
Photon flux (15-150 keV)    in 39.67 sec: 0.248949 ( -0.04383  0.044186 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.05741e-07 ( -5.89587e-08  3.63389e-08 ) ergs/cm2
 
Band function
Time interval is from   -3.220 sec. to   36.448 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.50431   ( -0.614033   0.885931 )
beta        : -3.64954    ( -1.02903   14.2002 )
Epeak [keV] : 12.9567      ( -12.8567 9987.04 )
Norm@50keV   : 5.832927E-03    ( -1.466481E-02   2.364352E-02) )
------------------------------------------------------------
 Chi-Squared =      82.84699     using    59 PHA bins.
 Reduced chi-squared =      1.506309     for     55 degrees of freedom
 Null hypothesis probability = 8.970E-03
 
Photon flux (15-150 keV)    in 39.67 sec: 0.250601 ( -0.022374  0.890629 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.13723e-07 ( -5.93911e-08  5.47791e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   26.172 sec. to   27.172 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.25865     ( -0.798554   1.13815 )
Norm@50keV  : 3.740189E-03    ( -2.336768E-03   2.121667E-03) )
------------------------------------------------------------
 Chi-Squared =      58.36474     using    59 PHA bins.
 Reduced chi-squared =      1.023943     for     57 degrees of freedom
 Null hypothesis probability = 0.425
 
Photon flux (15-150 keV)    in 1.000 sec: 0.638929 ( -0.253399  0.253454 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.5491e-08 ( -1.67738e-08  1.84128e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   26.172 sec. to   27.172 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.99306     ( -0.382739   0.312683 )
Epeak [keV] : 1.28840      (   )
Norm@50keV  : 5.144680E-03    ( -3.567106E-03   2.297514E-03) )
------------------------------------------------------------
 Chi-Squared =      58.44845     using    59 PHA bins.
 but latest trial   1.61032     gives Chi-Squared =   10.1559
 but latest trial  -39.4304     gives Chi-Squared =   10.0557
 Reduced chi-squared =      1.043722     for     56 degrees of freedom
 Null hypothesis probability = 0.386
 
Photon flux (15-150 keV)    in 1.000 sec: 0.638684 ( -0.253303  0.253369 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.54895e-08 ( -1.67958e-08  1.84154e-08 ) ergs/cm2
 
Band function
Time interval is from   26.172 sec. to   27.172 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.91520   ( -0.418606   0.934383 )
beta        : -9.27709    ( -7.73097   0.807479 )
Epeak [keV] : 11.6333      ( -11.3251 9988.58 )
Norm@50keV   : 5.716562E-03    ( -6.125515E-03   0.781119 )
------------------------------------------------------------
 Chi-Squared =      58.48044     using    59 PHA bins.
 Reduced chi-squared =      1.063281     for     55 degrees of freedom
 Null hypothesis probability = 0.349
 
Photon flux (15-150 keV)    in 1.000 sec: 0.634853 ( -0.251365  0.252285 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.1769e-08 ( -1.30853e-08  1.28043e-08 ) ergs/cm2
 
Plot creation:
Tue Jan  8 14:05:19 EST 2008