batgrbproduct Analysis for Trigger=305288

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Mar 10 15:13:58 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger305288/GCN5_download_hand
======================================================================

  Trigger: 00305288      Segment: 000

  BAT Trigger Time: 226831081.28   [s; MET]
      Trigger Stop: 226831082.304   [s; MET]
               UTC: 2008-03-10T08:37:58.647300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 220.080833938862   Dec: -0.16550263482074  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.4
     Image Trigger?:     NO
     Rate S/N Ratio:     12.6095202129185  [ if not an image trigger ]
     Image S/N Ratio:    7.4

  Flight Position:   [ source = BAT ]
    RA: 220.080833938862   Dec: -0.16550263482074  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 220.039796903704   Dec: -0.163549146031854  [deg; J2000]  
        { 14h 40m 09.6s , -00d 09' 48.8" }
         +/- 1.43877108650064 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.586689267167238 [arcmin] (formal 1-sigma fit error)
    SNR: 18.0890579070174
    RA  =  14h 40m  9.6s  (220.039797 deg.)
    Dec =  -0d  9' 49" (-0.163549 deg.)
 
  Angular difference between Flight and Ground position is 2.465000 arcmin
 
  Partial Coding Fraction: 0.6875    [ including projection effects ]

  Duration
     T90: 363.460000008345 +/- 17.3987512074303
        Measured from: -57.6999999880791
                   to: 305.760000020266     [s; relative to TRIGTIME]
     T50: 249.759999990463 +/- 9.11965899776479
        Measured from: -6.46799999475479
                   to: 243.291999995708     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.27199998497963     
                   to: 2.27199998497963     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -71.7639999985695     
                   to: 318.747999995947     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.007432   1.719636   0.711282   0.004004
           0.114044   0.105672   0.094368   0.086088 [error]
 Peak      0.054222   0.066095   0.026090   0.001203
           0.007276   0.006979   0.006009   0.004852 [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 6.63e-07 7.40e-07 5.91e-07 7.83e-07 2.28e-06 2.78e-06   erg/cm2
              Error 7.18e-08 5.64e-08 8.76e-08 2.28e-07 1.96e-07 3.29e-07   erg/cm2
Peak flux Power-law 5.70e-01 4.35e-01 2.22e-01 1.63e-01 1.30e+00 1.39e+00   ph/cm2/s
              Error 1.12e-01 5.93e-02 4.80e-02 6.66e-02 1.79e-01 1.90e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.43e-07 7.73e-07 5.59e-07 3.40e-07 2.17e-06 2.31e-06   erg/cm2
              Error 7.86e-08 5.57e-08 1.10e-07 4.23e-07 2.47e-07 5.15e-07   erg/cm2
Peak flux Cutoff-PL 5.06e-01 5.02e-01 2.13e-01 3.56e-02 1.25e+00 1.26e+00   ph/cm2/s
              Error 1.30e-01 8.80e-02 6.35e-02 7.06e-02 1.85e-01 1.94e-01   ph/cm2/s
 
Fluence        Band 3.38e-06 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   erg/cm2
Peak flux      Band 4.97e-01 5.13e-01 2.03e-01 7.60e-02 1.25e+00 1.29e+00   ph/cm2/s
              Error 1.30e-01 7.93e-02 4.98e-02 8.33e-02 1.80e-01 2.01e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.325    0.161    -      -           6.09e-04 6.42e-05   44.377 57
CPL   1.945    0.522       5.5   14.5      1.04e-03 1.61e-03   43.043  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.971    0.245    -      -           8.79e-03 1.46e-03   54.711 57
CPL   0.669    1.454      41.9   17.5      5.04e-02 2.60e-01   51.162  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: 12.864000 sec.
T50 in the 50-300 keV band: 7.616000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  390.512  -71.764  318.748
T90   363.460  -57.700  305.760
T50   249.760   -6.468  243.292
Peak    1.000    1.272    2.272

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  220.0398  -0.1635 0.0106   27.8  158.2       2.2039    18.1  TRIG_00305288       
------------------------------------------
 
Foreground time interval of the image:
-53.179  18.021 (delta_t =  71.200 [sec])
Background time interval of the image:

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  -71.764 sec. to  318.748 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.32456     ( -0.158125   0.164499 )
Norm@50keV  : 6.089675E-04    ( -6.462034E-05   6.374565E-05) )
------------------------------------------------------------
 Chi-Squared =      44.37689     using    59 PHA bins.
 Reduced chi-squared =     0.7785419     for     57 degrees of freedom
 Null hypothesis probability = 0.889
 
Photon flux (15-150 keV)    in 390.5 sec: 0.107895 ( -0.00818662  0.008201 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.28302e-06 ( -1.94692e-07  1.98179e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -71.764 sec. to  318.748 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.94471     ( -0.808017   0.235134 )
Epeak [keV] : 5.54712      ( -4.94662 24.0672 )
Norm@50keV  : 1.035366E-03    ( -1.035366E-03   2.176780E-03) )
------------------------------------------------------------
 Chi-Squared =      43.04333     using    59 PHA bins.
 but latest trial   1.10736     gives Chi-Squared =  6.599808E-02
 Reduced chi-squared =     0.7686310     for     56 degrees of freedom
 Null hypothesis probability = 0.898
 
Photon flux (15-150 keV)    in 390.5 sec: 0.105647 ( -0.00882463  0.008757 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.17023e-06 ( -2.42899e-07  2.51576e-07 ) ergs/cm2
 
Band function
Time interval is from  -71.764 sec. to  318.748 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.61526   ( -5.84130   1.63199 )
beta        : -9.34372    ( -0.214025   0.195726 )
Epeak [keV] : 20.5515      ( -6.21696 4.45449 )
Norm@50keV   : 1.635296E-03    ( -21.3093   100.690 )
------------------------------------------------------------
 Chi-Squared =      43.47527     using    59 PHA bins.
 Reduced chi-squared =     0.7904595     for     55 degrees of freedom
 Null hypothesis probability = 0.869
 
Photon flux (15-150 keV)    in 390.5 sec: 0.105637 ( -0.00881423  0.00881 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    1.272 sec. to    2.272 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97106     ( -0.237387   0.252726 )
Norm@50keV  : 8.790884E-03    ( -1.477371E-03   1.439631E-03) )
------------------------------------------------------------
 Chi-Squared =      54.71109     using    59 PHA bins.
 Reduced chi-squared =     0.9598438     for     57 degrees of freedom
 Null hypothesis probability = 0.561
 
Photon flux (15-150 keV)    in 1.000 sec: 1.30140 ( -0.17851  0.1786 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.09215e-08 ( -1.27937e-08  1.31729e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.272 sec. to    2.272 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.669062     ( -1.71703   1.19073 )
Epeak [keV] : 41.9152      ( -7.59269 27.3479 )
Norm@50keV  : 5.044890E-02    ( -3.996091E-02   0.480989 )
------------------------------------------------------------
 Chi-Squared =      51.16166     using    59 PHA bins.
 but latest trial   27.0553     gives Chi-Squared =   4.26469
 Reduced chi-squared =     0.9136010     for     56 degrees of freedom
 Null hypothesis probability = 0.658
 
Photon flux (15-150 keV)    in 1.000 sec: 1.25153 ( -0.18535  0.18487 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.24946e-08 ( -1.37072e-08  1.49976e-08 ) ergs/cm2
 
Band function
Time interval is from    1.272 sec. to    2.272 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.645017   ( -1.18886   3.18162 )
beta        : -2.59756    ( -7.40244   0.649872 )
Epeak [keV] : 42.0377      ( -19.4475 24.7617 )
Norm@50keV   : 5.181197E-02    ( -0.268671   288.907 )
------------------------------------------------------------
 Chi-Squared =      51.04560     using    59 PHA bins.
 Reduced chi-squared =     0.9281019     for     55 degrees of freedom
 Null hypothesis probability = 0.626
 
Photon flux (15-150 keV)    in 1.000 sec: 1.25466 ( -0.18433  0.17474 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.43308e-08 ( -1.3523e-08  1.26736e-08 ) ergs/cm2
 
Plot creation:
Mon Mar 10 20:41:14 EDT 2008