batgrbproduct Analysis for Trigger=148646

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Tue Jan  8 14:43:39 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger148646/SDC
======================================================================

  Trigger: 00148646      Segment: 000

  BAT Trigger Time: 144670081.92   [s; MET]
      Trigger Stop: 144670082.944   [s; MET]
               UTC: 2005-08-02T10:08:02.266620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 219.286638875251   Dec: 27.8064461097575  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.05
     Image Trigger?:     NO
     Rate S/N Ratio:     12.6491106406735  [ if not an image trigger ]
     Image S/N Ratio:    8.05

  Flight Position:   [ source = BAT ]
    RA: 219.286638875251   Dec: 27.8064461097575  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 219.288456828278   Dec: 27.791433893293  [deg; J2000]  
        { 14h 37m 09.2s , +27d 47' 29.2" }
         +/- 1.54570867554364 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.521900460198934 [arcmin] (formal 1-sigma fit error)
    SNR: 16.3281142572272
    RA  =  14h 37m  9.2s  (219.288457 deg.)
    Dec =  27d 47' 29" (27.791434 deg.)
 
  Angular difference between Flight and Ground position is 0.905886 arcmin
 
  Partial Coding Fraction: 0.2246094    [ including projection effects ]

  Duration
     T90: 30 +/- 10.1980390271856
        Measured from: -1.91999998688698
                   to: 28.080000013113     [s; relative to TRIGTIME]
     T50: 10 +/- 2
        Measured from: 0.0800000131130219
                   to: 10.080000013113     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0800000131130219     
                   to: 1.08000001311302     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.91999998688698     
                   to: 34.080000013113     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.748950   1.107790   0.986705   0.392993
           0.083170   0.088144   0.081432   0.074496 [error]
 Peak      0.052521   0.107314   0.102404   0.051361
           0.014650   0.015766   0.015409   0.013379 [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 3.02e-07 5.49e-07 7.67e-07 2.24e-06 2.20e-06 3.85e-06   erg/cm2
              Error 4.75e-08 5.15e-08 7.80e-08 5.04e-07 1.93e-07 5.51e-07   erg/cm2
Peak flux Power-law 7.47e-01 8.46e-01 6.87e-01 9.29e-01 2.62e+00 3.21e+00   ph/cm2/s
              Error 2.29e-01 1.62e-01 1.15e-01 3.20e-01 4.43e-01 4.96e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.88e-07 5.58e-07 7.85e-07 1.76e-06 2.19e-06 3.24e-06   erg/cm2
              Error 5.87e-08 4.40e-08 9.19e-08 9.22e-07 1.49e-07 9.43e-07   erg/cm2
Peak flux Cutoff-PL 6.70e-01 8.78e-01 7.33e-01 6.10e-01 2.59e+00 2.89e+00   ph/cm2/s
              Error 2.76e-01 1.83e-01 1.53e-01 4.95e-01 4.46e-01 6.78e-01   ph/cm2/s
 
Fluence        Band 2.87e-07 5.56e-07 7.82e-07 1.77e-06 2.19e-06 3.41e-06   erg/cm2
              Error 5.80e-08 5.80e-08 9.29e-08 9.21e-07 1.98e-07 9.41e-07   erg/cm2
Peak flux      Band 6.27e-01 9.20e-01 7.04e-01 7.94e-01 2.56e+00 3.04e+00   ph/cm2/s
              Error 3.07e-01 1.93e-01 1.60e-01 5.91e-01 3.50e-01 6.25e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.519    0.148    -      -           6.29e-03 5.23e-04   57.957 57
CPL   1.332    0.545     198.3 5000.0      7.69e-03 4.97e-03   57.663  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.301    0.259    -      -           2.19e-02 3.42e-03   45.002 57
CPL   0.831    0.998     140.1 5000.0      3.63e-02 5.99e-02   44.423 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: 12.416000 sec.
T50 in the 50-300 keV band: 6.272000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   37.000   -2.920   34.080
T90    30.000   -1.920   28.080
T50    10.000    0.080   10.080
Peak    1.000    0.080    1.080

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  219.2885 +27.7914 0.0118   51.9   -6.4       3.3479    16.3  TRIG_00148646       
------------------------------------------
 
Foreground time interval of the image:
 -2.920  34.080 (delta_t =  37.000 [sec])
Background time interval of the image:
-67.315  -2.920 (delta_t =  64.395 [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   -2.920 sec. to   34.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.51944     ( -0.148031   0.148630 )
Norm@50keV  : 6.287366E-03    ( -5.231421E-04   5.229297E-04) )
------------------------------------------------------------
 Chi-Squared =      57.95729     using    59 PHA bins.
 Reduced chi-squared =      1.016795     for     57 degrees of freedom
 Null hypothesis probability = 0.440
 
Photon flux (15-150 keV)    in 37.00 sec: 0.789088 ( -0.071272  0.071599 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.20023e-06 ( -1.923e-07  1.92922e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -2.920 sec. to   34.080 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.33154     ( -0.639117   0.451088 )
Epeak [keV] : 198.286      ( -198.276 9801.71 )
Norm@50keV  : 7.686847E-03    ( -2.741241E-03   7.207162E-03) )
------------------------------------------------------------
 Chi-Squared =      57.66295     using    59 PHA bins.
 but latest trial   1.63914     gives Chi-Squared =   2.10688
 but latest trial  2.579013E-03 gives Chi-Squared =   126.161
 Reduced chi-squared =      1.029696     for     56 degrees of freedom
 Null hypothesis probability = 0.414
 
Photon flux (15-150 keV)    in 37.00 sec: 0.781978 ( -0.072869  0.073807 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18736e-06 ( -9.99333e-08  1.97846e-07 ) ergs/cm2
 
Band function
Time interval is from   -2.920 sec. to   34.080 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.33778   ( -8.66222   6.32918 )
beta        : -1.51944    ( -7.86063   0.759753 )
Epeak [keV] : 39.0686      ( -191.740 9808.16 )
Norm@50keV   : 9.974604E-03    ( -1.930058E-03   284373. )
------------------------------------------------------------
 Chi-Squared =      57.95728     using    59 PHA bins.
 Reduced chi-squared =      1.053769     for     55 degrees of freedom
 Null hypothesis probability = 0.367
 
Photon flux (15-150 keV)    in 37.00 sec: 0.781991 ( -0.074451  0.074584 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18589e-06 ( -1.99297e-07  1.9738e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.080 sec. to    1.080 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30115     ( -0.263510   0.255467 )
Norm@50keV  : 2.194778E-02    ( -3.428847E-03   3.417216E-03) )
------------------------------------------------------------
 Chi-Squared =      45.00250     using    59 PHA bins.
 Reduced chi-squared =     0.7895176     for     57 degrees of freedom
 Null hypothesis probability = 0.875
 
Photon flux (15-150 keV)    in 1.000 sec: 2.61898 ( -0.4414  0.44481 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.16817e-07 ( -3.4472e-08  3.4606e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.080 sec. to    1.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.830838     ( -1.30201   0.694224 )
Epeak [keV] : 140.066      ( -140.056 9859.93 )
Norm@50keV  : 3.627222E-02    ( -1.728310E-02   0.102561 )
------------------------------------------------------------
 Chi-Squared =      44.42320     using    59 PHA bins.
 Reduced chi-squared =     0.7932714     for     56 degrees of freedom
 Null hypothesis probability = 0.868
 
Photon flux (15-150 keV)    in 1.000 sec: 2.58745 ( -0.44377  0.44886 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.14553e-07 ( -3.5831e-08  3.56e-08 ) ergs/cm2
 
Band function
Time interval is from    0.080 sec. to    1.080 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.177547   ( -14.0268   0.973242 )
beta        : -1.58965    ( -0.438026   0.310128 )
Epeak [keV] : 74.7689      ( -37.2388 520.948 )
Norm@50keV   : 8.496448E-02    ( -154.123   56.4046 )
------------------------------------------------------------
 Chi-Squared =      43.71640     using    59 PHA bins.
 Reduced chi-squared =     0.7948436     for     55 degrees of freedom
 Null hypothesis probability = 0.863
 
Photon flux (15-150 keV)    in 1.000 sec: 2.56406 ( -0.46731  0.23343 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.14621e-07 ( -3.6004e-08  3.5378e-08 ) ergs/cm2
 
Plot creation:
Tue Jan  8 15:01:06 EST 2008