batgrbproduct Analysis for Trigger=345551

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.42
    Process Start Time (local time): Sat Mar  7 11:10:37 EST 2009
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger345551/GCN5_download_cron
======================================================================

  Trigger: 00345551      Segment: 000

  BAT Trigger Time: 258090402.432   [s; MET]
      Trigger Stop: 258090414.592   [s; MET]
               UTC: 2009-03-07T03:46:37.877980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 244.979295086239   Dec: -28.6441582093691  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    5.73
     Image Trigger?:     NO
     Rate S/N Ratio:     10.3923048454133  [ if not an image trigger ]
     Image S/N Ratio:    5.73

  Flight Position:   [ source = BAT ]
    RA: 244.979295086239   Dec: -28.6441582093691  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 245.007218608076   Dec: -28.6467358017333  [deg; J2000]  
        { 16h 20m 01.7s , -28d 38' 48.2" }
         +/- 3.31227989127135 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.92809529064664 [arcmin] (formal 1-sigma fit error)
    SNR: 5.49641819399822
 
  Angular difference between Flight and Ground position is 1.478457 arcmin
 
  Partial Coding Fraction: 0.875    [ including projection effects ]

  Duration
     T90: 22 +/- 6.40312423743285
        Measured from: -7.43199992179871
                   to: 14.5680000782013     [s; relative to TRIGTIME]
     T50: 11 +/- 7.81024967590665
        Measured from: -1.43199992179871
                   to: 9.56800007820129     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.56799998879433     
                   to: 6.56799998879433     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -7.43200001120567     
                   to: 16.5679999887943     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.062958   0.142950   0.099303   0.045622
           0.030195   0.027641   0.024192   0.021972 [error]
 Peak      0.012102   0.014384   0.003880   0.000228
           0.006208   0.005779   0.004886   0.004559 [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 2.11e-08 5.00e-08 9.45e-08 4.34e-07 2.56e-07 6.00e-07   erg/cm2
              Error 9.46e-09 1.35e-08 2.27e-08 2.48e-07 5.92e-08 2.58e-07   erg/cm2
Peak flux Power-law 9.24e-02 8.20e-02 5.00e-02 4.63e-02 2.44e-01 2.71e-01   ph/cm2/s
              Error 7.60e-02 6.41e-02 3.77e-02 8.33e-02 1.37e-01 1.53e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.52e-08 5.56e-08 1.02e-07 8.27e-08 2.26e-07 2.55e-07   erg/cm2
              Error 1.15e-08 1.84e-08 3.00e-08 3.24e-07 7.79e-08 3.34e-07   erg/cm2
Peak flux Cutoff-PL 9.52e-02 1.15e-01 1.70e-02 8.71e-05 2.27e-01 2.27e-01   ph/cm2/s
              Error 6.68e-02 6.25e-02 4.25e-02 6.54e-02 1.21e-01 1.21e-01   ph/cm2/s
 
Fluence        Band 1.01e-08 6.23e-08 9.69e-08 1.97e-07 2.29e-07 4.05e-07   erg/cm2
              Error 1.38e-08 1.66e-08 6.56e-08 5.36e-08 1.82e-07 0.00e+00   erg/cm2
Peak flux      Band 8.56e-02 1.02e-01 4.41e-02 2.25e-02 2.44e-01 2.26e-01   ph/cm2/s
              Error 7.45e-02 5.72e-02 4.28e-02 3.65e-02 1.37e-01 1.25e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.080    0.393    -      -           1.01e-03 2.24e-04   69.630 57
CPL  -0.452    2.184      84.0 4973.3      5.38e-03 3.26e-02   68.525  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.712    1.082    -      -           1.83e-03 1.47e-03   59.465 57
CPL  -2.397    0.000      33.7  476.9      1.15e+00 8.85e+00   58.530  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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   24.000   -7.432   16.568
T90    22.000   -7.432   14.568
T50    11.000   -1.432    9.568
Peak    1.000    5.568    6.568

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  245.0072 -28.6467 0.0348   22.4  164.1       0.3446     5.5  TRIG_00345551       
------------------------------------------
 
Foreground time interval of the image:
 -7.432  16.568 (delta_t =  24.000 [sec])
Background time interval of the image:
-60.432 -20.282 (delta_t =  40.150 [sec])
-19.432  -7.432 (delta_t =  12.000 [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   -7.432 sec. to   16.568 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.08003     ( -0.406887   0.378431 )
Norm@50keV  : 1.014327E-03    ( -2.250153E-04   2.228861E-04) )
------------------------------------------------------------
 Chi-Squared =      69.63002     using    59 PHA bins.
 Reduced chi-squared =      1.221579     for     57 degrees of freedom
 Null hypothesis probability = 0.122
 
Photon flux (15-150 keV)    in 24.00 sec: 0.117445 ( -0.0267786  0.02709 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.56169e-07 ( -5.88319e-08  5.96592e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -7.432 sec. to   16.568 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.452027     ( -2.54797   1.81979 )
Epeak [keV] : 84.0169      ( -30.6925 9915.98 )
Norm@50keV  : 5.378262E-03    ( -5.378262E-03   5.986905E-02) )
------------------------------------------------------------
 Chi-Squared =      68.52467     using    59 PHA bins.
 but latest trial  6.524731E-02 gives Chi-Squared =   2.74516
 Reduced chi-squared =      1.223655     for     56 degrees of freedom
 Null hypothesis probability = 0.122
 
Photon flux (15-150 keV)    in 24.00 sec: 0.108576 ( -0.0443655  0.030837 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.25703e-07 ( -7.82278e-08  7.75133e-08 ) ergs/cm2
 
Band function
Time interval is from   -7.432 sec. to   16.568 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.10575   ( -2.59102   0.303233 )
beta        : -1.79557    ( -1.80167   0.862776 )
Epeak [keV] : 60.1900      ( -14.3412 9.59044 )
Norm@50keV   : 4.099233E-02    ( -0.562734   3.13740 )
------------------------------------------------------------
 Chi-Squared =      66.30274     using    59 PHA bins.
 Reduced chi-squared =      1.205504     for     55 degrees of freedom
 Null hypothesis probability = 0.141
 
Photon flux (15-150 keV)    in 24.00 sec: 0.104303 ( -0.0250969  0.022514 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.28654e-07 ( -4.9615e-08  5.76012e-08 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    5.568 sec. to    6.568 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.71192     ( -1.06176   1.10136 )
Norm@50keV  : 1.831248E-03    ( -1.831248E-03   1.102065E-03) )
------------------------------------------------------------
 Chi-Squared =      59.46487     using    59 PHA bins.
 Reduced chi-squared =      1.043243     for     57 degrees of freedom
 Null hypothesis probability = 0.386
 
Photon flux (15-150 keV)    in 1.000 sec: 0.244072 ( -0.136067  0.137297 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.69287e-08 ( -1.02261e-08  1.13126e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    5.568 sec. to    6.568 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.39668     (     )
Epeak [keV] : 33.7095      ( -10.2202 943.490 )
Norm@50keV  : 1.14762    ( -2.98276   14.7260 )
------------------------------------------------------------
 Chi-Squared =      58.52990     using    59 PHA bins.
 but latest trial   1256.77     gives Chi-Squared =   6.44253
 Reduced chi-squared =      1.045177     for     56 degrees of freedom
 Null hypothesis probability = 0.383
 
Photon flux (15-150 keV)    in 1.000 sec: 0.226889 ( -0.120746  0.121469 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10375e-08 ( -5.96736e-09  1.45203e-08 ) ergs/cm2
 
Band function
Time interval is from    5.568 sec. to    6.568 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.972695   ( -13.9912   1.00884 )
beta        : -9.07523    ( -6.53883   2.41897 )
Epeak [keV] : 52.5907      ( -33.8778 551.078 )
Norm@50keV   : 5.367626E-03    ( -24.7223   17.7493 )
------------------------------------------------------------
 Chi-Squared =      59.28690     using    59 PHA bins.
 Reduced chi-squared =      1.077944     for     55 degrees of freedom
 Null hypothesis probability = 0.322
 
Photon flux (15-150 keV)    in 1.000 sec: 0.243905 ( -0.129373  0.143629 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32504e-08 ( -7.15596e-09  1.19311e-08 ) ergs/cm2
 
Plot creation:
Sat Mar  7 11:27:54 EST 2009