batgrbproduct Analysis for Trigger=178750

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Dec 31 09:57:08 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger178750/SDC
======================================================================

  Trigger: 00178750      Segment: 000

  BAT Trigger Time: 159810892.8   [s; MET]
      Trigger Stop: 159810893.824   [s; MET]
               UTC: 2006-01-24T15:54:51.825540    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 77.0434182139533   Dec: 69.7093915850525  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.59
     Image Trigger?:     NO
     Rate S/N Ratio:     10.7238052947636  [ if not an image trigger ]
     Image S/N Ratio:    6.59

  Flight Position:   [ source = BAT ]
    RA: 77.0434182139533   Dec: 69.7093915850525  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 77.0881504949215   Dec: 69.7239818375151  [deg; J2000]  
        { 05h 08m 21.2s , +69d 43' 26.3" }
         +/- 1.73191118550489 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.721453542914654 [arcmin] (formal 1-sigma fit error)
    SNR: 13.8792979322254
    RA  =   5h  8m 21.2s  (77.088150 deg.)
    Dec =  69d 43' 26" (69.723982 deg.)
 
  Angular difference between Flight and Ground position is 1.277511 arcmin
 
  Partial Coding Fraction: 0.6171875    [ including projection effects ]

  Duration
     T90: 13.6320000290871 +/- 1.30678232181628
        Measured from: -0.936000019311905
                   to: 12.6960000097752     [s; relative to TRIGTIME]
     T50: 7.39599999785423 +/- 2.44399671740983
        Measured from: 1.05199998617172
                   to: 8.44799998402596     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.187999993562698     
                   to: 1.1879999935627     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.62800002098083     
                   to: 13.1879999935627     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.258782   0.293547   0.169567   0.058266
           0.024611   0.025433   0.023147   0.022105 [error]
 Peak      0.027892   0.039656   0.025232   0.014089
           0.006568   0.006871   0.006443   0.005750 [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 8.81e-08 1.32e-07 1.47e-07 3.12e-07 4.61e-07 6.77e-07   erg/cm2
              Error 1.37e-08 1.30e-08 2.33e-08 1.02e-07 5.34e-08 1.24e-07   erg/cm2
Peak flux Power-law 3.28e-01 2.99e-01 1.88e-01 1.81e-01 8.91e-01 9.96e-01   ph/cm2/s
              Error 1.03e-01 6.07e-02 5.30e-02 1.01e-01 1.79e-01 2.02e-01   ph/cm2/s
 
Fluence   Cutoff-PL 8.81e-08 1.32e-07 1.47e-07 3.09e-07 4.61e-07 6.96e-07   erg/cm2
              Error 1.37e-08 1.30e-08 2.33e-08 1.01e-07 5.34e-08 1.25e-07   erg/cm2
Peak flux Cutoff-PL 3.02e-01 3.18e-01 1.96e-01 9.52e-02 8.74e-01 9.11e-01   ph/cm2/s
              Error 8.80e-02 7.50e-02 6.02e-02 1.31e-01 1.82e-01 2.34e-01   ph/cm2/s
 
Fluence        Band 8.58e-08 1.35e-07 1.45e-07 2.88e-07 4.56e-07 6.52e-07   erg/cm2
              Error 1.47e-08 1.70e-08 2.50e-08 1.36e-07 5.63e-08 1.57e-07   erg/cm2
Peak flux      Band 3.02e-01 3.18e-01 1.96e-01 9.53e-02 8.74e-01 9.11e-01   ph/cm2/s
              Error 1.18e-01 7.54e-02 6.02e-02 1.29e-01 1.82e-01 2.33e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.839    0.189    -      -           3.39e-03 3.87e-04   54.897 57
CPL   1.789    0.000     181.8    0.0      3.61e-03 3.88e-04   54.956 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.669    0.354    -      -           6.78e-03 1.49e-03   48.319 57
CPL   1.089    1.376      74.8 5000.0      1.38e-02 4.90e-02   47.674  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: 3.200000 sec.
T50 in the 50-300 keV band: 1.472000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   14.816   -1.628   13.188
T90    13.632   -0.936   12.696
T50     7.396    1.052    8.448
Peak    1.000    0.188    1.188

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   77.0882 +69.7240 0.0138   37.8 -158.3       0.8376    13.9  TRIG_00178750       
------------------------------------------
 
Foreground time interval of the image:
 -1.628  13.188 (delta_t =  14.816 [sec])
Background time interval of the image:
-24.195  -1.628 (delta_t =  22.567 [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   -1.628 sec. to   13.188 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.83869     ( -0.186314   0.192457 )
Norm@50keV  : 3.385489E-03    ( -3.907352E-04   3.823151E-04) )
------------------------------------------------------------
 Chi-Squared =      54.89718     using    59 PHA bins.
 Reduced chi-squared =     0.9631085     for     57 degrees of freedom
 Null hypothesis probability = 0.554
 
Photon flux (15-150 keV)    in 14.82 sec: 0.473696 ( -0.047483  0.04755 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.61327e-07 ( -5.29118e-08  5.38989e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -1.628 sec. to   13.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.78886     (     )
Epeak [keV] : 181.773      (   )
Norm@50keV  : 3.608003E-03    ( -4.011095E-04   3.755945E-04) )
------------------------------------------------------------
 Chi-Squared =      54.95564     using    59 PHA bins.
 Reduced chi-squared =     0.9813508     for     56 degrees of freedom
 Null hypothesis probability = 0.514
 
Photon flux (15-150 keV)    in 14.82 sec: 0.473533 ( -0.047465  0.047533 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.61434e-07 ( -5.30482e-08  5.37907e-08 ) ergs/cm2
 
Band function
Time interval is from   -1.628 sec. to   13.188 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.06095   ( -8.93904   5.31280 )
beta        : -1.90558    ( -8.09442   0.232736 )
Epeak [keV] : 35.5436      ( -35.4436 9964.46 )
Norm@50keV   : 1.162525E-02    ( -0.279289   352.368 )
------------------------------------------------------------
 Chi-Squared =      54.33183     using    59 PHA bins.
 Reduced chi-squared =     0.9878514     for     55 degrees of freedom
 Null hypothesis probability = 0.500
 
Photon flux (15-150 keV)    in 14.82 sec: 0.469682 ( -0.050289  0.047121 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.55896e-07 ( -5.79758e-08  5.4548e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.188 sec. to    1.188 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.66909     ( -0.344185   0.364700 )
Norm@50keV  : 6.777594E-03    ( -1.508686E-03   1.462874E-03) )
------------------------------------------------------------
 Chi-Squared =      48.31916     using    59 PHA bins.
 Reduced chi-squared =     0.8477046     for     57 degrees of freedom
 Null hypothesis probability = 0.787
 
Photon flux (15-150 keV)    in 1.000 sec: 0.890631 ( -0.178807  0.178999 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.29385e-08 ( -1.44855e-08  1.48421e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.188 sec. to    1.188 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.08939     ( -1.60972   1.14296 )
Epeak [keV] : 74.7582      ( -74.7482 9925.24 )
Norm@50keV  : 1.375601E-02    ( -1.375601E-02   8.426682E-02) )
------------------------------------------------------------
 Chi-Squared =      47.67398     using    59 PHA bins.
 but latest trial   2.04346     gives Chi-Squared =   1.56902
 Reduced chi-squared =     0.8513210     for     56 degrees of freedom
 Null hypothesis probability = 0.778
 
Photon flux (15-150 keV)    in 1.000 sec: 0.874332 ( -0.182447  0.181998 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.05546e-08 ( -1.5499e-08  1.57185e-08 ) ergs/cm2
 
Band function
Time interval is from    0.188 sec. to    1.188 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.09527   ( -8.90473   1.33631 )
beta        : -8.66208    ( -1.33792   7.29278 )
Epeak [keV] : 75.1600      ( -75.0600 9924.84 )
Norm@50keV   : 1.364677E-02    ( -1.364677E-02   8.451584E-02) )
------------------------------------------------------------
 Chi-Squared =      47.67392     using    59 PHA bins.
 Reduced chi-squared =     0.8667986     for     55 degrees of freedom
 Null hypothesis probability = 0.748
 
Photon flux (15-150 keV)    in 1.000 sec: 0.874316 ( -0.182465  0.182264 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.04959e-08 ( -1.54677e-08  1.5733e-08 ) ergs/cm2
 
Plot creation:
Mon Dec 31 10:07:10 EST 2007