batgrbproduct Analysis for Trigger=309096

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sun Apr 13 18:37:33 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger309096/GCN5_download_cron
======================================================================

  Trigger: 00309096      Segment: 000

  BAT Trigger Time: 229748062.016   [s; MET]
      Trigger Stop: 229748062.528   [s; MET]
               UTC: 2008-04-13T02:54:19.302440    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 287.289929388104   Dec: -27.679225960068  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.06
     Image Trigger?:     NO
     Rate S/N Ratio:     15.6524758424985  [ if not an image trigger ]
     Image S/N Ratio:    9.06

  Flight Position:   [ source = BAT ]
    RA: 287.289929388104   Dec: -27.679225960068  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 287.300600796074   Dec: -27.6769415457002  [deg; J2000]  
        { 19h 09m 12.1s , -27d 40' 37.0" }
         +/- 0.636977592527491 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.183173311790275 [arcmin] (formal 1-sigma fit error)
    SNR: 57.9350005720869
    RA  =  19h  9m 12.1s  (287.300601 deg.)
    Dec =  -27d 40' 37" (-27.676942 deg.)
 
  Angular difference between Flight and Ground position is 0.583349 arcmin
 
  Partial Coding Fraction: 0.8125    [ including projection effects ]

  Duration
     T90: 46.3519999980927 +/- 0.470472123802958
        Measured from: 1.11599999666214
                   to: 47.4679999947548     [s; relative to TRIGTIME]
     T50: 15.391999989748 +/- 0.75705748169605
        Measured from: 2.84000000357628
                   to: 18.2319999933243     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.64399999380112     
                   to: 2.64399999380112     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0879999995231628     
                   to: 50.33599999547     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.594520   2.166045   1.511170   0.325071
           0.046637   0.043395   0.039150   0.036815 [error]
 Peak      0.137024   0.258331   0.235163   0.059347
           0.008437   0.008917   0.008617   0.006337 [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 5.01e-07 8.86e-07 1.20e-06 3.33e-06 3.47e-06 5.92e-06   erg/cm2
              Error 2.91e-08 2.85e-08 4.19e-08 2.77e-07 9.99e-08 2.96e-07   erg/cm2
Peak flux Power-law 1.44e+00 1.75e+00 1.54e+00 2.33e+00 5.55e+00 7.06e+00   ph/cm2/s
              Error 1.19e-01 8.67e-02 6.90e-02 2.28e-01 2.33e-01 2.93e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.84e-07 8.94e-07 1.21e-06 2.67e-06 3.43e-06 5.11e-06   erg/cm2
              Error 3.88e-08 3.06e-08 4.60e-08 7.64e-07 1.15e-07 7.83e-07   erg/cm2
Peak flux Cutoff-PL 1.28e+00 1.79e+00 1.62e+00 1.53e+00 5.43e+00 6.23e+00   ph/cm2/s
              Error 1.53e-01 9.40e-02 8.78e-02 4.12e-01 2.44e-01 4.85e-01   ph/cm2/s
 
Fluence        Band 4.78e-07 8.90e-07 1.21e-06 2.67e-06 3.43e-06 5.00e-06   erg/cm2
              Error 3.65e-08 3.06e-08 4.60e-08 6.12e-07 1.17e-07 0.00e+00   erg/cm2
Peak flux      Band 1.28e+00 1.79e+00 1.62e+00 1.53e+00 5.43e+00 6.23e+00   ph/cm2/s
              Error 1.53e-01 9.40e-02 8.78e-02 4.12e-01 2.44e-01 4.85e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.566    0.056    -      -           7.33e-03 2.00e-04   67.437 57
CPL   1.404    0.216     199.2 4943.7      8.70e-03 1.94e-03   66.003 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.186    0.072    -      -           4.74e-02 1.89e-03   54.549 57
CPL   0.735    0.305     160.3  111.6      7.53e-02 2.35e-02   47.443 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: 44.736000 sec.
T50 in the 50-300 keV band: 14.720000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   50.424   -0.088   50.336
T90    46.352    1.116   47.468
T50    15.392    2.840   18.232
Peak    1.000    1.644    2.644

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  287.3006 -27.6769 0.0033   16.7  -90.6       2.8470    57.9  TRIG_00309096       
------------------------------------------
 
Foreground time interval of the image:
 -0.088  10.085 (delta_t =  10.173 [sec])
Background time interval of the image:
-239.016  -0.088 (delta_t = 238.928 [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   -0.088 sec. to   50.336 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.56564     ( -5.614221E-02   5.616820E-02) )
Norm@50keV  : 7.328139E-03    ( -2.002586E-04   2.002404E-04) )
------------------------------------------------------------
 Chi-Squared =      67.43731     using    59 PHA bins.
 Reduced chi-squared =      1.183111     for     57 degrees of freedom
 Null hypothesis probability = 0.162
 
Photon flux (15-150 keV)    in 50.42 sec: 0.931953 ( -0.029001  0.029146 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.47068e-06 ( -9.9635e-08  1.00069e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.088 sec. to   50.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.40435     ( -0.234147   0.198236 )
Epeak [keV] : 199.154      ( -86.5710 9800.85 )
Norm@50keV  : 8.699793E-03    ( -1.492252E-03   2.387386E-03) )
------------------------------------------------------------
 Chi-Squared =      66.00298     using    59 PHA bins.
 Reduced chi-squared =      1.178625     for     56 degrees of freedom
 Null hypothesis probability = 0.169
 
Photon flux (15-150 keV)    in 50.42 sec: 0.919348 ( -0.033473  0.032302 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.42847e-06 ( -1.17746e-07  1.11832e-07 ) ergs/cm2
 
Band function
Time interval is from   -0.088 sec. to   50.336 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.02216   ( -8.97784   2.38943 )
beta        : -1.62672    ( -8.37328   9.025764E-02) )
Epeak [keV] : 69.5636      ( -69.4636 9893.77 )
Norm@50keV   : 1.497268E-02    ( -1.497268E-02   973.467 )
------------------------------------------------------------
 Chi-Squared =      64.89069     using    59 PHA bins.
 Reduced chi-squared =      1.179831     for     55 degrees of freedom
 Null hypothesis probability = 0.170
 
Photon flux (15-150 keV)    in 50.42 sec: 0.910529 ( -0.03851  0.03642 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.42523e-06 ( -1.17675e-07  1.16833e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    1.644 sec. to    2.644 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.18605     ( -7.232070E-02   7.194173E-02) )
Norm@50keV  : 4.736120E-02    ( -1.893573E-03   1.892805E-03) )
------------------------------------------------------------
 Chi-Squared =      54.54914     using    59 PHA bins.
 Reduced chi-squared =     0.9570024     for     57 degrees of freedom
 Null hypothesis probability = 0.568
 
Photon flux (15-150 keV)    in 1.000 sec: 5.54857 ( -0.233  0.23342 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.82462e-07 ( -2.0872e-08  2.0817e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    1.644 sec. to    2.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.735372     ( -0.315951   0.294010 )
Epeak [keV] : 160.331      ( -43.4881 179.776 )
Norm@50keV  : 7.533137E-02    ( -1.923341E-02   2.786566E-02) )
------------------------------------------------------------
 Chi-Squared =      47.44341     using    59 PHA bins.
 Reduced chi-squared =     0.8472037     for     56 degrees of freedom
 Null hypothesis probability = 0.785
 
Photon flux (15-150 keV)    in 1.000 sec: 5.43183 ( -0.24391  0.24416 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.72937e-07 ( -2.2189e-08  2.2239e-08 ) ergs/cm2
 
Band function
Time interval is from    1.644 sec. to    2.644 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.735406   ( -0.293963   0.316053 )
beta        : -8.96544    ( -1.03456   7.73953 )
Epeak [keV] : 160.332      ( -43.4764 179.370 )
Norm@50keV   : 7.532276E-02    ( -1.922964E-02   2.788062E-02) )
------------------------------------------------------------
 Chi-Squared =      47.44340     using    59 PHA bins.
 Reduced chi-squared =     0.8626072     for     55 degrees of freedom
 Null hypothesis probability = 0.756
 
Photon flux (15-150 keV)    in 1.000 sec: 5.43198 ( -0.24408  0.24439 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.72767e-07 ( -2.2327e-08  2.206e-08 ) ergs/cm2
 
Plot creation:
Sun Apr 13 19:38:52 EDT 2008