batgrbproduct Analysis for Trigger=331475

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sun Oct 12 19:58:34 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger331475/GCN5_download_cron
======================================================================

  Trigger: 00331475      Segment: 000

  BAT Trigger Time: 245509827.072   [s; MET]
      Trigger Stop: 245509829.12   [s; MET]
               UTC: 2008-10-12T13:10:23.902940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 30.2174055107331   Dec: -17.6414535051542  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.78
     Image Trigger?:     NO
     Rate S/N Ratio:     17.606816861659  [ if not an image trigger ]
     Image S/N Ratio:    7.78

  Flight Position:   [ source = BAT ]
    RA: 30.2174055107331   Dec: -17.6414535051542  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 30.1847535450489   Dec: -17.626619759353  [deg; J2000]  
        { 02h 00m 44.3s , -17d 37' 35.8" }
         +/- 1.69093356314935 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.768311728077212 [arcmin] (formal 1-sigma fit error)
    SNR: 14.3622775914992
 
  Angular difference between Flight and Ground position is 2.068347 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 30.3359999656677 +/- 7.01809318091378
        Measured from: -21.1999998986721
                   to: 9.13600006699562     [s; relative to TRIGTIME]
     T50: 10.0159999728203 +/- 6.76540850334611
        Measured from: -6.51199990510941
                   to: 3.50400006771088     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.467999994754791     
                   to: 1.46799999475479     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -23.3759999871254     
                   to: 15.055999994278     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.213225   0.547711   0.587620   0.243790
           0.055550   0.057606   0.053406   0.046545 [error]
 Peak      0.029726   0.043016   0.068147   0.015481
           0.009252   0.010091   0.010283   0.008134 [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 8.33e-08 2.16e-07 4.50e-07 2.39e-06 1.21e-06 3.15e-06   erg/cm2
              Error 1.91e-08 2.96e-08 4.91e-08 6.11e-07 1.31e-07 6.29e-07   erg/cm2
Peak flux Power-law 2.57e-01 3.58e-01 3.69e-01 6.96e-01 1.21e+00 1.68e+00   ph/cm2/s
              Error 1.01e-01 8.78e-02 7.54e-02 2.99e-01 2.41e-01 3.55e-01   ph/cm2/s
 
Fluence   Cutoff-PL 7.38e-08 2.22e-07 4.75e-07 1.33e-06 1.19e-06 2.03e-06   erg/cm2
              Error 2.40e-08 3.24e-08 6.22e-08 1.12e-06 1.39e-07 1.12e-06   erg/cm2
Peak flux Cutoff-PL 1.78e-01 3.71e-01 4.27e-01 2.88e-01 1.15e+00 1.26e+00   ph/cm2/s
              Error 1.24e-01 1.03e-01 1.04e-01 4.17e-01 2.49e-01 4.50e-01   ph/cm2/s
 
Fluence        Band 7.25e-08 2.21e-07 4.74e-07 1.32e-06 1.19e-06 2.07e-06   erg/cm2
              Error 2.38e-08 3.23e-08 6.22e-08 1.12e-06 1.39e-07 1.12e-06   erg/cm2
Peak flux      Band 1.27e-01 2.74e-01 3.35e-01 2.55e-01 8.87e-01 9.93e-01   ph/cm2/s
              Error 1.20e-01 1.06e-01 1.01e-01 4.24e-01 2.46e-01 4.64e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.944    0.185    -      -           2.86e-03 3.10e-04   56.373 57
CPL   0.453    0.755     186.3 5000.0      4.65e-03 4.03e-03   55.109 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.956    0.323    -      -           1.05e-02 2.07e-03   70.733 57
CPL  -0.287    1.780     110.5 4963.1      3.50e-02 1.19e-01   68.561  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: 13.952000 sec.
T50 in the 50-300 keV band: 5.824000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   38.432  -23.376   15.056
T90    30.336  -21.200    9.136
T50    10.016   -6.512    3.504
Peak    1.000    0.468    1.468

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   30.1848 -17.6266 0.0134   33.6   69.7       1.6956    14.4  TRIG_00331475       
------------------------------------------
 
Foreground time interval of the image:
-23.376  15.056 (delta_t =  38.432 [sec])
Background time interval of the image:
-239.072 -101.252 (delta_t = 137.820 [sec])
-100.072 -71.232 (delta_t =  28.840 [sec])
-70.072 -23.376 (delta_t =  46.696 [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  -23.376 sec. to   15.056 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.944200     ( -0.189061   0.180488 )
Norm@50keV  : 2.859146E-03    ( -3.114678E-04   3.076529E-04) )
------------------------------------------------------------
 Chi-Squared =      56.37311     using    59 PHA bins.
 Reduced chi-squared =     0.9890019     for     57 degrees of freedom
 Null hypothesis probability = 0.499
 
Photon flux (15-150 keV)    in 38.43 sec: 0.328432 ( -0.036033  0.03621 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21276e-06 ( -1.31231e-07  1.31281e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -23.376 sec. to   15.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.452549     ( -0.890652   0.620001 )
Epeak [keV] : 186.325      ( -186.315 9813.67 )
Norm@50keV  : 4.652831E-03    ( -2.005144E-03   6.054350E-03) )
------------------------------------------------------------
 Chi-Squared =      55.10905     using    59 PHA bins.
 Reduced chi-squared =     0.9840901     for     56 degrees of freedom
 Null hypothesis probability = 0.509
 
Photon flux (15-150 keV)    in 38.43 sec: 0.321648 ( -0.037494  0.037367 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18848e-06 ( -1.40185e-07  1.37161e-07 ) ergs/cm2
 
Band function
Time interval is from  -23.376 sec. to   15.056 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.304745   ( -11.5194   2.08264 )
beta        : -1.19012    ( -0.373123   0.235794 )
Epeak [keV] : 140.558      ( -46.6175 849.074 )
Norm@50keV   : 5.682064E-03    ( -2.56729   8.34917 )
------------------------------------------------------------
 Chi-Squared =      54.80825     using    59 PHA bins.
 Reduced chi-squared =     0.9965137     for     55 degrees of freedom
 Null hypothesis probability = 0.482
 
Photon flux (15-150 keV)    in 38.43 sec: 0.321628 ( -0.037488  0.037615 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18778e-06 ( -1.40012e-07  1.37756e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.464 sec. to    1.472 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.956353     ( -0.330421   0.316238 )
Norm@50keV  : 1.049170E-02    ( -2.077649E-03   2.061176E-03) )
------------------------------------------------------------
 Chi-Squared =      70.73346     using    59 PHA bins.
 Reduced chi-squared =      1.240938     for     57 degrees of freedom
 Null hypothesis probability = 0.104
 
Photon flux (15-150 keV)    in 1.008 sec: 1.20568 ( -0.239941  0.24113 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16193e-07 ( -2.3871e-08  2.40579e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.464 sec. to    1.472 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.286830     ( -2.18056   1.38045 )
Epeak [keV] : 110.541      ( -36.6984 9889.46 )
Norm@50keV  : 3.501646E-02    ( -3.501645E-02   0.202271 )
------------------------------------------------------------
 Chi-Squared =      68.56091     using    59 PHA bins.
 but latest trial   41.1411     gives Chi-Squared =   26.0185
 Reduced chi-squared =      1.224302     for     56 degrees of freedom
 Null hypothesis probability = 0.121
 
Photon flux (15-150 keV)    in 1.008 sec: 1.15239 ( -0.249201  0.24933 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11926e-07 ( -2.54589e-08  2.5196e-08 ) ergs/cm2
 
Band function
Time interval is from    0.464 sec. to    1.472 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.281787   ( -1.37507   1.73078 )
beta        : -8.48736    (     )
Epeak [keV] : 110.759      (   )
Norm@50keV   : 3.484452E-02    (     )
------------------------------------------------------------
 Chi-Squared =      68.56095     using    59 PHA bins.
 Reduced chi-squared =      1.246563     for     55 degrees of freedom
 Null hypothesis probability = 0.103
 
Photon flux (15-150 keV)    in 1.008 sec: 0.886950 ( -0.241197  0.25 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.88544e-08 ( -2.4852e-08  2.48147e-08 ) ergs/cm2
 
Plot creation:
Sun Oct 12 20:18:46 EDT 2008