batgrbproduct Analysis for Trigger=307604

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Thu Mar 27 03:37:25 EDT 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger307604/SDC
======================================================================

  Trigger: 00307604      Segment: 000

  BAT Trigger Time: 228110960   [s; MET]
      Trigger Stop: 228111024   [s; MET]
               UTC: 2008-03-25T04:09:17.332080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 277.894805295646   Dec: 36.5106329498597  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.46
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.46

  Flight Position:   [ source = BAT ]
    RA: 277.894805295646   Dec: 36.5106329498597  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 277.906128054039   Dec: 36.5160719218339  [deg; J2000]  
        { 18h 31m 37.5s , +36d 30' 57.9" }
         +/- 1.99151586825735 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.940534442717483 [arcmin] (formal 1-sigma fit error)
    SNR: 11.3687572294304
    RA  =  18h 31m 37.5s  (277.906128 deg.)
    Dec =   36d 30' 58" (36.516072 deg.)
 
  Angular difference between Flight and Ground position is 0.636108 arcmin
 
  Partial Coding Fraction: 0.1083984    [ including projection effects ]

  Duration
     T90: 128.432000011206 +/- 34.1860933668972
        Measured from: -23.0719999969006
                   to: 105.360000014305     [s; relative to TRIGTIME]
     T50: 64.244000017643 +/- 20.9614568271843
        Measured from: -3.43999999761581
                   to: 60.8040000200272     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 38.0200000107288     
                   to: 39.0200000107288     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -29.2960000038147     
                   to: 170.456000000238     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.025062   2.284176   2.097104   0.411850
           0.216503   0.198308   0.174946   0.155114 [error]
 Peak      0.039701   0.056945   0.036026   0.034256
           0.019711   0.017256   0.015755   0.013101 [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 7.97e-07 1.31e-06 1.63e-06 4.02e-06 4.87e-06 7.74e-06   erg/cm2
              Error 1.38e-07 1.31e-07 1.78e-07 9.95e-07 4.36e-07 1.09e-06   erg/cm2
Peak flux Power-law 5.14e-01 4.59e-01 2.82e-01 2.63e-01 1.37e+00 1.52e+00   ph/cm2/s
              Error 3.46e-01 1.96e-01 1.19e-01 2.23e-01 5.70e-01 5.74e-01   ph/cm2/s
 
Fluence   Cutoff-PL 7.98e-07 1.31e-06 1.63e-06 4.00e-06 4.87e-06 7.71e-06   erg/cm2
              Error 1.38e-07 1.31e-07 1.78e-07 9.89e-07 4.36e-07 1.08e-06   erg/cm2
Peak flux Cutoff-PL 3.78e-01 4.95e-01 3.25e-01 1.10e-01 1.28e+00 1.31e+00   ph/cm2/s
              Error 3.94e-01 2.39e-01 1.63e-01 2.53e-01 5.99e-01 6.72e-01   ph/cm2/s
 
Fluence        Band 7.94e-07 1.31e-06 1.63e-06 4.00e-06 4.87e-06 7.79e-06   erg/cm2
              Error 6.91e-08 1.14e-07 1.42e-07 6.96e-07 4.31e-07 7.17e-07   erg/cm2
Peak flux      Band 3.75e-01 5.05e-01 3.22e-01 1.52e-01 1.23e+00 1.39e+00   ph/cm2/s
              Error 2.31e-01 1.52e-01 2.40e-01 5.86e-01 5.24e-01 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.685    0.166    -      -           2.63e-03 2.30e-04   50.639 57
CPL   1.683    0.167    9999.3 5000.0      2.63e-03 2.30e-04   50.646 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.704    0.649    -      -           1.03e-02 3.78e-03   65.782 57
CPL   0.446    2.611      67.9 5000.0      3.94e-02 6.28e-01   65.339  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: 122.752000 sec.
T50 in the 50-300 keV band: 46.912000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  199.752  -29.296  170.456
T90   128.432  -23.072  105.360
T50    64.244   -3.440   60.804
Peak    1.000   38.020   39.020

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  277.9061 +36.5161 0.0169   55.8 -165.3       5.2868    11.4  TRIG_00307604       
------------------------------------------
 
Foreground time interval of the image:
-29.296  75.605 (delta_t = 104.901 [sec])
Background time interval of the image:
-320.195 -29.296 (delta_t = 290.899 [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  -29.296 sec. to  170.456 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.68483     ( -0.164816   0.166832 )
Norm@50keV  : 2.630991E-03    ( -2.298283E-04   2.296062E-04) )
------------------------------------------------------------
 Chi-Squared =      50.63945     using    59 PHA bins.
 Reduced chi-squared =     0.8884113     for     57 degrees of freedom
 Null hypothesis probability = 0.711
 
Photon flux (15-150 keV)    in 199.8 sec: 0.347593 ( -0.034815  0.03518 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.87314e-06 ( -4.35064e-07  4.36123e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -29.296 sec. to  170.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.68308     ( -0.165885   0.167865 )
Epeak [keV] : 9999.31      ( -9999.30 0.689453 )
Norm@50keV  : 2.633805E-03    ( -2.281459E-04   2.325701E-04) )
------------------------------------------------------------
 Chi-Squared =      50.64553     using    59 PHA bins.
 Reduced chi-squared =     0.9043844     for     56 degrees of freedom
 Null hypothesis probability = 0.677
 
Photon flux (15-150 keV)    in 199.8 sec: 0.347390 ( -0.034794  0.035162 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.87422e-06 ( -4.35384e-07  4.36263e-07 ) ergs/cm2
 
Band function
Time interval is from  -29.296 sec. to  170.456 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.44081   ( -1.173973E-03   14.9988 )
beta        : -1.66589    ( -0.166823   0.164828 )
Epeak [keV] : 11.3130      ( -11.2130 9988.69 )
Norm@50keV   : 5.659341E-03    ( -3.123212E-02   3.117409E-02) )
------------------------------------------------------------
 Chi-Squared =      50.67539     using    59 PHA bins.
 Reduced chi-squared =     0.9213707     for     55 degrees of freedom
 Null hypothesis probability = 0.640
 
Photon flux (15-150 keV)    in 199.8 sec: 1.93753 ( -1.93753  691.519 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.86847e-06 ( -4.23956e-07  4.37442e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   38.020 sec. to   39.020 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.70366     ( -0.636981   0.660578 )
Norm@50keV  : 1.027560E-02    ( -3.776968E-03   3.775684E-03) )
------------------------------------------------------------
 Chi-Squared =      65.78226     using    59 PHA bins.
 Reduced chi-squared =      1.154075     for     57 degrees of freedom
 Null hypothesis probability = 0.199
 
Photon flux (15-150 keV)    in 1.000 sec: 1.36650 ( -0.558483  0.58104 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.51032e-08 ( -3.52201e-08  3.53948e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   38.020 sec. to   39.020 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.445651     ( -3.44565   1.77548 )
Epeak [keV] : 67.8744      ( -67.8644 9932.13 )
Norm@50keV  : 3.940156E-02    ( -3.940156E-02   1.21601 )
------------------------------------------------------------
 Chi-Squared =      65.33886     using    59 PHA bins.
 but latest trial   1.35757     gives Chi-Squared =   2.75989
 Reduced chi-squared =      1.166765     for     56 degrees of freedom
 Null hypothesis probability = 0.184
 
Photon flux (15-150 keV)    in 1.000 sec: 1.27843 ( -0.577789  0.6193 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.14919e-08 ( -4.01462e-08  3.72501e-08 ) ergs/cm2
 
Band function
Time interval is from   38.020 sec. to   39.020 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.629132   ( -10.6291   4.37087 )
beta        : -2.56255    ( -7.43745   1.39190 )
Epeak [keV] : 56.4933      ( -56.3933 9943.51 )
Norm@50keV   : 0.139192    ( -0.139192   75.1464 )
------------------------------------------------------------
 Chi-Squared =      65.05443     using    59 PHA bins.
 Reduced chi-squared =      1.182808     for     55 degrees of freedom
 Null hypothesis probability = 0.166
 
Photon flux (15-150 keV)    in 1.000 sec: 1.22508 ( -0.53958  0.63191 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.11281e-08 ( -3.44907e-08  3.59379e-08 ) ergs/cm2
 
Plot creation:
Thu Mar 27 05:05:39 EDT 2008