batgrbproduct Analysis for Trigger=306858

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Thu Mar 20 11:43:51 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger306858/GCN5_download_cron
======================================================================

  Trigger: 00306858      Segment: 000

  BAT Trigger Time: 227680661.12   [s; MET]
      Trigger Stop: 227680662.528   [s; MET]
               UTC: 2008-03-20T04:37:38.464040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 177.780563457759   Dec: 57.1439944141214  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.64
     Image Trigger?:     NO
     Rate S/N Ratio:     9.9498743710662  [ if not an image trigger ]
     Image S/N Ratio:    7.64

  Flight Position:   [ source = BAT ]
    RA: 177.780563457759   Dec: 57.1439944141214  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 177.763052801393   Dec: 57.1618227872438  [deg; J2000]  
        { 11h 51m 03.1s , +57d 09' 42.6" }
         +/- 1.75892485441492 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.745365730993733 [arcmin] (formal 1-sigma fit error)
    SNR: 13.575790102407
    RA  =  11h 51m  3.1s  (177.763053 deg.)
    Dec =   57d  9' 43" (57.161823 deg.)
 
  Angular difference between Flight and Ground position is 1.212027 arcmin
 
  Partial Coding Fraction: 0.9375    [ including projection effects ]

  Duration
     T90: 13.8440000116825 +/- 1.91739093029525
        Measured from: -1.14800000190735
                   to: 12.6960000097752     [s; relative to TRIGTIME]
     T50: 6.89599999785423 +/- 2.99864033646295
        Measured from: 0.428000003099442
                   to: 7.32400000095367     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.15200001001358     
                   to: 1.15200001001358     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.67199999094009     
                   to: 13.8479999899864     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.151911   0.177445   0.106469   0.042777
           0.018717   0.019023   0.017380   0.015951 [error]
 Peak      0.022030   0.026272   0.018540   0.006561
           0.004962   0.005051   0.004576   0.004041 [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 4.54e-08 7.38e-08 9.06e-08 2.19e-07 2.72e-07 4.28e-07   erg/cm2
              Error 8.53e-09 8.87e-09 1.70e-08 8.55e-08 3.95e-08 1.01e-07   erg/cm2
Peak flux Power-law 2.10e-01 1.92e-01 1.21e-01 1.17e-01 5.72e-01 6.40e-01   ph/cm2/s
              Error 6.81e-02 4.10e-02 3.70e-02 7.06e-02 1.21e-01 1.39e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.50e-08 7.49e-08 9.07e-08 1.77e-07 2.69e-07 3.62e-07   erg/cm2
              Error 9.20e-09 1.09e-08 1.75e-08 1.01e-07 4.40e-08 1.48e-07   erg/cm2
Peak flux Cutoff-PL 1.91e-01 2.07e-01 1.27e-01 5.58e-02 5.60e-01 5.80e-01   ph/cm2/s
              Error 7.95e-02 5.24e-02 4.23e-02 9.30e-02 1.24e-01 1.58e-01   ph/cm2/s
 
Fluence        Band 4.43e-08 7.57e-08 8.89e-08 2.01e-07 2.68e-07 4.13e-07   erg/cm2
              Error 8.98e-09 1.13e-08 1.81e-08 1.51e-07 4.13e-08 1.59e-07   erg/cm2
Peak flux      Band 1.91e-01 2.07e-01 1.27e-01 5.60e-02 5.60e-01 5.80e-01   ph/cm2/s
              Error 7.95e-02 5.25e-02 4.23e-02 9.30e-02 1.24e-01 1.59e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.704    0.224    -      -           1.89e-03 2.59e-04   37.715 57
CPL   1.484    0.637     106.1    0.0      2.49e-03 2.73e-03   37.698 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.664    0.376    -      -           4.36e-03 1.03e-03   54.242 57
CPL   0.985    1.567      70.7 4981.0      1.00e-02 4.91e-02   53.541 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: 4.992000 sec.
T50 in the 50-300 keV band: 2.496000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   15.520   -1.672   13.848
T90    13.844   -1.148   12.696
T50     6.896    0.428    7.324
Peak    1.000    0.152    1.152

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  177.7631 +57.1618 0.0142   22.1 -178.3       0.4667    13.6  TRIG_00306858       
------------------------------------------
 
Foreground time interval of the image:
 -1.672  13.848 (delta_t =  15.520 [sec])
Background time interval of the image:
-119.120 -56.553 (delta_t =  62.567 [sec])
-55.120  -1.672 (delta_t =  53.448 [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   -1.672 sec. to   13.848 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.70370     ( -0.220718   0.227970 )
Norm@50keV  : 1.893747E-03    ( -2.616640E-04   2.556347E-04) )
------------------------------------------------------------
 Chi-Squared =      37.71481     using    59 PHA bins.
 Reduced chi-squared =     0.6616632     for     57 degrees of freedom
 Null hypothesis probability = 0.977
 
Photon flux (15-150 keV)    in 15.52 sec: 0.251836 ( -0.030359  0.030377 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.72047e-07 ( -3.907e-08  3.99361e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -1.672 sec. to   13.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.48420     ( -0.827903   0.446229 )
Epeak [keV] : 106.128      (   )
Norm@50keV  : 2.487159E-03    ( -3.895182E-04   5.069171E-03) )
------------------------------------------------------------
 Chi-Squared =      37.69807     using    59 PHA bins.
 Reduced chi-squared =     0.6731799     for     56 degrees of freedom
 Null hypothesis probability = 0.971
 
Photon flux (15-150 keV)    in 15.52 sec: 0.250703 ( -0.031334  0.030761 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.68893e-07 ( -4.54208e-08  4.26443e-08 ) ergs/cm2
 
Band function
Time interval is from   -1.672 sec. to   13.848 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.13998   ( -8.86002   5.76033 )
beta        : -1.76643    ( -8.23357   0.268783 )
Epeak [keV] : 46.6659      ( -46.5659 620.361 )
Norm@50keV   : 4.556782E-03    ( -9.693463E-02   167.401 )
------------------------------------------------------------
 Chi-Squared =      37.37991     using    59 PHA bins.
 Reduced chi-squared =     0.6796348     for     55 degrees of freedom
 Null hypothesis probability = 0.967
 
Photon flux (15-150 keV)    in 15.52 sec: 0.250659 ( -0.031327  0.031118 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.6847e-07 ( -4.24239e-08  4.01208e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.152 sec. to    1.152 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.66408     ( -0.362697   0.388789 )
Norm@50keV  : 4.357448E-03    ( -1.050367E-03   1.014299E-03) )
------------------------------------------------------------
 Chi-Squared =      54.24152     using    59 PHA bins.
 Reduced chi-squared =     0.9516057     for     57 degrees of freedom
 Null hypothesis probability = 0.579
 
Photon flux (15-150 keV)    in 1.000 sec: 0.571637 ( -0.121158  0.121208 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.04626e-08 ( -1.00535e-08  1.03786e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.152 sec. to    1.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.984948     ( -1.88965   1.24350 )
Epeak [keV] : 70.7444      ( -32.6617 9929.26 )
Norm@50keV  : 1.002784E-02    ( -1.002784E-02   8.822639E-02) )
------------------------------------------------------------
 Chi-Squared =      53.54062     using    59 PHA bins.
 Reduced chi-squared =     0.9560825     for     56 degrees of freedom
 Null hypothesis probability = 0.569
 
Photon flux (15-150 keV)    in 1.000 sec: 0.560349 ( -0.123941  0.12345 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.86738e-08 ( -1.05136e-08  1.10276e-08 ) ergs/cm2
 
Band function
Time interval is from    0.152 sec. to    1.152 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.990960   ( -9.00904   1.65299 )
beta        : -8.59972    ( -1.40028   7.24727 )
Epeak [keV] : 71.0308      ( -31.2538 9928.97 )
Norm@50keV   : 9.946347E-03    ( -9.946347E-03   8.838486E-02) )
------------------------------------------------------------
 Chi-Squared =      53.54068     using    59 PHA bins.
 Reduced chi-squared =     0.9734668     for     55 degrees of freedom
 Null hypothesis probability = 0.531
 
Photon flux (15-150 keV)    in 1.000 sec: 0.560444 ( -0.124014  0.123371 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.86443e-08 ( -1.05052e-08  1.10261e-08 ) ergs/cm2
 
Plot creation:
Thu Mar 20 12:03:39 EDT 2008