batgrbproduct Analysis for Trigger=311603

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed May 14 19:06:10 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger311603/GCN5_download_cron
======================================================================

  Trigger: 00311603      Segment: 000

  BAT Trigger Time: 232453960   [s; MET]
      Trigger Stop: 232454024   [s; MET]
               UTC: 2008-05-14T10:32:37.210640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 263.832819101055   Dec: -35.6234751720873  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.18
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.18

  Flight Position:   [ source = BAT ]
    RA: 263.832819101055   Dec: -35.6234751720873  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 263.858753305155   Dec: -35.6778280761805  [deg; J2000]  
        { 17h 35m 26.1s , -35d 40' 40.2" }
         +/- 3.32001028530341 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.83504775234635 [arcmin] (formal 1-sigma fit error)
    SNR: 5.47814446879119
 
  Angular difference between Flight and Ground position is 3.497718 arcmin
 
  Partial Coding Fraction: 0.4570312    [ including projection effects ]

  Duration
     T90: 274.719999998808 +/- 140.252279325654
        Measured from: -83.8799999952316
                   to: 190.840000003576     [s; relative to TRIGTIME]
     T50: 104.991999983788 +/- 114.047443963474
        Measured from: -37.6559999883175
                   to: 67.33599999547     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -79.608000010252     
                   to: -78.608000010252     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -90.4880000054836     
                   to: 204.768000006676     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.899283   0.446654  -0.097940   0.355486
           0.138956   0.129212   0.114010   0.111698 [error]
 Peak      0.036149   0.014468   0.009206   0.003009
           0.008835   0.007929   0.007343   0.006355 [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 6.60e-07 1.67e-07 2.22e-08 3.31e-09 8.51e-07 8.52e-07   erg/cm2
              Error 1.05e-07 7.13e-08 2.26e-08 6.65e-09 1.51e-07 1.52e-07   erg/cm2
Peak flux Power-law 3.49e-01 1.50e-01 3.84e-02 1.21e-02 5.45e-01 5.50e-01   ph/cm2/s
              Error 1.60e-01 1.16e-01 5.08e-02 3.73e-02 2.16e-01 2.20e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.59e-07 1.67e-07 2.21e-08 3.28e-09 8.51e-07 8.52e-07   erg/cm2
              Error 1.05e-07 7.13e-08 2.26e-08 6.60e-09 1.51e-07 1.52e-07   erg/cm2
Peak flux Cutoff-PL 3.49e-01 1.50e-01 3.83e-02 1.20e-02 5.44e-01 5.49e-01   ph/cm2/s
              Error 1.60e-01 1.16e-01 5.07e-02 3.70e-02 2.16e-01 2.20e-01   ph/cm2/s
 
Fluence        Band 2.25e-07 1.69e-07 2.30e-08 3.53e-09 8.44e-07 1.34e-06   erg/cm2
              Error 4.16e-08 3.98e-08 3.98e-09 1.38e-07 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 3.72e-01 1.44e-01 2.97e-02 7.28e-03 5.50e-01 5.58e-01   ph/cm2/s
              Error 1.76e-01 9.17e-02 2.89e-02 3.35e-02 2.13e-01 2.20e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    4.915    0.791    -      -           6.37e-05 6.38e-05   72.230 57
CPL   1.807    0.000       1.3    6.2      2.51e-02 1.02e+02   73.945  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.967    1.324    -      -           2.03e-03 2.08e-03   53.456 57
CPL   1.954    1.352       1.1    0.0      1.22e-02 0.00e+00   54.017  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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  295.256  -90.488  204.768
T90   274.720  -83.880  190.840
T50   104.992  -37.656   67.336
Peak    1.000  -79.608  -78.608

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  263.8588 -35.6778 0.0351   32.3   39.6       1.6063     5.5  TRIG_00311603       
------------------------------------------
 
Foreground time interval of the image:
-90.488  72.401 (delta_t = 162.889 [sec])
Background time interval of the image:
-239.000 -90.488 (delta_t = 148.512 [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
Multiple GTIs in the spectrum
tstart tstop
-90.488000 198.690000
203.000000 204.768000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 4.91510     ( -0.735449   0.845831 )
Norm@50keV  : 6.374928E-05    ( -6.374928E-05   6.375910E-05) )
------------------------------------------------------------
 Chi-Squared =      72.23032     using    59 PHA bins.
 Reduced chi-squared =      1.267199     for     57 degrees of freedom
 Null hypothesis probability = 8.420E-02
 
Photon flux (15-150 keV)    in 290.9 sec: 9.074084E-02 ( -0.0142331  0.0142402 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.51278e-07 ( -1.48115e-07  1.53584e-07 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-90.488000 198.690000
203.000000 204.768000
Parameters  : value       lower 90%   higher 90%
Photon index: 1.80655     (     )
Epeak [keV] : 1.26501      ( -0.320815 12.0787 )
Norm@50keV  : 2.505215E-02    ( -1.997536E-02   203.439 )
------------------------------------------------------------
 Chi-Squared =      73.94495     using    59 PHA bins.
 but latest trial  0.725565     gives Chi-Squared =  0.598862
 but latest trial  -1.50921     gives Chi-Squared =  0.129234
 Reduced chi-squared =      1.320446     for     56 degrees of freedom
 Null hypothesis probability = 5.438E-02
 
Photon flux (15-150 keV)    in 290.9 sec: 9.066078E-02 ( -0.0142228  0.0142302 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.50891e-07 ( -1.48054e-07  1.53694e-07 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
-90.488000 198.690000
203.000000 204.768000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.30231   ( -7.18048   0.758604 )
beta        : -3.59678    ( -0.847946   0.731872 )
Epeak [keV] : 8.22514      ( -8.12514 9991.77 )
Norm@50keV   : 8.503006E-03    ( -0.396434   17.8390 )
------------------------------------------------------------
 Chi-Squared =      88.92730     using    59 PHA bins.
 Reduced chi-squared =      1.616860     for     55 degrees of freedom
 Null hypothesis probability = 2.559E-03
 
Photon flux (15-150 keV)    in 290.9 sec: 9.083333E-02 ( -0.0142787  0.0151317 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.44061e-07 ( -1.31597e-07  1.44167e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  -79.608 sec. to  -78.608 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.96709     ( -1.06794   1.58095 )
Norm@50keV  : 2.028400E-03    ( -2.028400E-03   2.132856E-03) )
------------------------------------------------------------
 Chi-Squared =      53.45563     using    59 PHA bins.
 Reduced chi-squared =     0.9378181     for     57 degrees of freedom
 Null hypothesis probability = 0.609
 
Photon flux (15-150 keV)    in 1.000 sec: 0.544690 ( -0.215605  0.215754 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.40111e-08 ( -1.18749e-08  1.50159e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -79.608 sec. to  -78.608 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.95450     ( -0.972379   1.73208 )
Epeak [keV] : 1.09673      (   )
Norm@50keV  : 1.218517E-02    (     )
------------------------------------------------------------
 Chi-Squared =      54.01735     using    59 PHA bins.
 but latest trial  0.982121     gives Chi-Squared =   14.4962
 but latest trial  -3.75047     gives Chi-Squared =  0.346130
 Reduced chi-squared =     0.9645956     for     56 degrees of freedom
 Null hypothesis probability = 0.550
 
Photon flux (15-150 keV)    in 1.000 sec: 0.544387 ( -0.215529  0.215679 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.4007e-08 ( -1.18797e-08  1.50048e-08 ) ergs/cm2
 
Band function
Time interval is from  -79.608 sec. to  -78.608 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.50774   ( -8.49226   6.50774 )
beta        : -2.77109    ( -7.03535   1.06351 )
Epeak [keV] : 7.66355      ( -7.56200 42.7790 )
Norm@50keV   : 2.734943E-02    ( -2.850590E-02   40.5648 )
------------------------------------------------------------
 Chi-Squared =      53.51989     using    59 PHA bins.
 Reduced chi-squared =     0.9730889     for     55 degrees of freedom
 Null hypothesis probability = 0.531
 
Photon flux (15-150 keV)    in 1.000 sec: 0.550199 ( -0.213515  0.21218 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.49563e-08 ( -1.25795e-08  9.7843e-09 ) ergs/cm2
 
Plot creation:
Wed May 14 19:33:32 EDT 2008