batgrbproduct Analysis for Trigger=176918

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Dec 31 09:07:19 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger176918/SDC
======================================================================

  Trigger: 00176918      Segment: 000

  BAT Trigger Time: 158703344.192   [s; MET]
      Trigger Stop: 158703345.216   [s; MET]
               UTC: 2006-01-11T20:15:43.242160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 286.33719257667   Dec: 70.3598868857769  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.97
     Image Trigger?:     NO
     Rate S/N Ratio:     18.5202591774521  [ if not an image trigger ]
     Image S/N Ratio:    6.97

  Flight Position:   [ source = BAT ]
    RA: 286.33719257667   Dec: 70.3598868857769  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 286.43266129838   Dec: 70.3771471289469  [deg; J2000]  
        { 19h 05m 43.8s , +70d 22' 37.7" }
         +/- 1.51977261687644 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.691876696802943 [arcmin] (formal 1-sigma fit error)
    SNR: 16.7276388711324
    RA  =  19h  5m 43.8s  (286.432661 deg.)
    Dec =  70d 22' 38" (70.377147 deg.)
 
  Angular difference between Flight and Ground position is 2.185427 arcmin
 
  Partial Coding Fraction: 0.2851562    [ including projection effects ]

  Duration
     T90: 58.8320000171661 +/- 4.29058130905367
        Measured from: -1.2039999961853
                   to: 57.6280000209808     [s; relative to TRIGTIME]
     T50: 21.1440000236034 +/- 3.49172738252821
        Measured from: 2.28799998760223
                   to: 23.4320000112057     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.363999992609024     
                   to: 1.36399999260902     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.02799999713898     
                   to: 61.6960000097752     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.509755   0.584681   0.837775   0.341266
           0.062464   0.064524   0.057378   0.047598 [error]
 Peak      0.047206   0.029804   0.095829   0.016735
           0.009980   0.011211   0.010589   0.007989 [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 1.24e-07 3.04e-07 5.97e-07 2.89e-06 1.61e-06 3.92e-06   erg/cm2
              Error 2.53e-08 3.60e-08 5.40e-08 6.56e-07 1.42e-07 6.68e-07   erg/cm2
Peak flux Power-law 2.90e-01 4.12e-01 4.34e-01 8.47e-01 1.40e+00 1.98e+00   ph/cm2/s
              Error 1.17e-01 1.02e-01 7.88e-02 3.35e-01 2.67e-01 3.76e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.24e-07 3.05e-07 5.97e-07 2.87e-06 1.61e-06 3.90e-06   erg/cm2
              Error 2.53e-08 3.61e-08 5.41e-08 6.52e-07 1.42e-07 7.26e-07   erg/cm2
Peak flux Cutoff-PL 2.08e-01 4.08e-01 4.90e-01 4.69e-01 1.35e+00 1.58e+00   ph/cm2/s
              Error 1.95e-01 1.31e-01 1.29e-01 4.79e-01 2.96e-01 5.98e-01   ph/cm2/s
 
Fluence        Band 1.22e-07 3.03e-07 5.96e-07 2.87e-06 1.61e-06 2.94e-06   erg/cm2
              Error 2.50e-08 3.59e-08 5.40e-08 7.31e-07 1.42e-07 0.00e+00   erg/cm2
Peak flux      Band 2.08e-01 4.08e-01 4.90e-01 4.71e-01 1.35e+00 1.58e+00   ph/cm2/s
              Error 1.95e-01 1.31e-01 1.29e-01 4.65e-01 2.95e-01 5.94e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.029    0.167    -      -           2.36e-03 2.13e-04   62.529 57
CPL   0.972    0.209    1000.0    0.0      2.51e-03 2.14e-04   62.874 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.923    0.319    -      -           1.22e-02 2.31e-03   66.480 57
CPL   0.008    2.111     143.9 4958.1      2.72e-02 1.09e-01   65.560  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: 55.616000 sec.
T50 in the 50-300 keV band: 16.064000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   63.724   -2.028   61.696
T90    58.832   -1.204   57.628
T50    21.144    2.288   23.432
Peak    1.000    0.364    1.364

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  286.4327 +70.3771 0.0115   33.2  113.5       1.5561    16.7  TRIG_00176918       
------------------------------------------
 
Foreground time interval of the image:
 -2.028  19.213 (delta_t =  21.241 [sec])
Background time interval of the image:
-299.192  -2.028 (delta_t = 297.164 [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   -2.028 sec. to   61.696 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02908     ( -0.170319   0.164652 )
Norm@50keV  : 2.364523E-03    ( -2.148235E-04   2.118559E-04) )
------------------------------------------------------------
 Chi-Squared =      62.52948     using    59 PHA bins.
 Reduced chi-squared =      1.097008     for     57 degrees of freedom
 Null hypothesis probability = 0.286
 
Photon flux (15-150 keV)    in 63.72 sec: 0.272694 ( -0.02569  0.025841 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.61276e-06 ( -1.42249e-07  1.42452e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -2.028 sec. to   61.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.971864     ( -0.190603   0.226574 )
Epeak [keV] : 1000.000      (   )
Norm@50keV  : 2.514650E-03    ( -2.207868E-04   2.069976E-04) )
------------------------------------------------------------
 Chi-Squared =      62.87373     using    59 PHA bins.
 Reduced chi-squared =      1.122745     for     56 degrees of freedom
 Null hypothesis probability = 0.246
 
Photon flux (15-150 keV)    in 63.72 sec: 0.272582 ( -0.025677  0.025832 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.61341e-06 ( -1.42274e-07  1.42637e-07 ) ergs/cm2
 
Band function
Time interval is from   -2.028 sec. to   61.696 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.897289   ( -9.10271   3.04228 )
beta        : -1.02912    ( -0.164568   0.170328 )
Epeak [keV] : 34.1994      ( -34.0994 9965.80 )
Norm@50keV   : 3.752803E-03    ( -1.594994E-03   603.776 )
------------------------------------------------------------
 Chi-Squared =      62.52948     using    59 PHA bins.
 Reduced chi-squared =      1.136900     for     55 degrees of freedom
 Null hypothesis probability = 0.226
 
Photon flux (15-150 keV)    in 63.72 sec: 3.14400 ( -3.144  3.39342 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.61223e-06 ( -1.42274e-07  1.42503e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.364 sec. to    1.364 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.922539     ( -0.329634   0.308534 )
Norm@50keV  : 1.219937E-02    ( -2.338968E-03   2.282929E-03) )
------------------------------------------------------------
 Chi-Squared =      66.47960     using    59 PHA bins.
 Reduced chi-squared =      1.166309     for     57 degrees of freedom
 Null hypothesis probability = 0.183
 
Photon flux (15-150 keV)    in 1.000 sec: 1.40059 ( -0.26622  0.26837 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.35749e-07 ( -2.4919e-08  2.4938e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.364 sec. to    1.364 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 7.960825E-03     ( -3.00796   1.21488 )
Epeak [keV] : 143.863      ( -60.0061 9856.14 )
Norm@50keV  : 2.719386E-02    ( -1.682411E-02   0.200982 )
------------------------------------------------------------
 Chi-Squared =      65.55958     using    59 PHA bins.
 but latest trial   1.18215     gives Chi-Squared =   5.38290
 but latest trial  0.231021     gives Chi-Squared =   3.84170
 Reduced chi-squared =      1.170707     for     56 degrees of freedom
 Null hypothesis probability = 0.179
 
Photon flux (15-150 keV)    in 1.000 sec: 1.34832 ( -0.30648  0.28614 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.34949e-07 ( -2.5891e-08  2.5482e-08 ) ergs/cm2
 
Band function
Time interval is from    0.364 sec. to    1.364 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.844305   ( -9.15569   5.84430 )
beta        : -0.922544    ( -0.308532   0.329641 )
Epeak [keV] : 16.2103      ( -7.812500E-02 9.765625E-04) )
Norm@50keV   : 1.778798E-02    ( -2.347850E-03   2.290011E-03) )
------------------------------------------------------------
 Chi-Squared =      66.47961     using    59 PHA bins.
 Reduced chi-squared =      1.208720     for     55 degrees of freedom
 Null hypothesis probability = 0.138
 
Photon flux (15-150 keV)    in 1.000 sec: 1.34907 ( -0.30432  0.28577 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.34948e-07 ( -2.5848e-08  2.5396e-08 ) ergs/cm2
 
Plot creation:
Mon Dec 31 09:18:41 EST 2007