batgrbproduct Analysis for Trigger=302777

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Fri Feb  8 17:42:31 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger302777/GCN5_download_cron
======================================================================

  Trigger: 00302777      Segment: 000

  BAT Trigger Time: 224169464   [s; MET]
      Trigger Stop: 224169528   [s; MET]
               UTC: 2008-02-08T13:17:41.440000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 241.83904941288   Dec: -19.6921500506871  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.8
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    12.8

  Flight Position:   [ source = BAT ]
    RA: 241.83904941288   Dec: -19.6921500506871  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 241.875832651248   Dec: -19.7155320930689  [deg; J2000]  
        { 16h 07m 30.2s , -19d 42' 55.9" }
         +/- 1.69092522181246 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.725274390110227 [arcmin] (formal 1-sigma fit error)
    SNR: 14.3623788046618
    RA  =  16h  7m 30.2s  (241.875833 deg.)
    Dec = -19d 42' 56" (-19.715532 deg.)
 
  Angular difference between Flight and Ground position is 2.507054 arcmin
 
  Partial Coding Fraction: 0.1503906    [ including projection effects ]

  Duration
     T90: 90.5360000133514 +/- 34.949197673513
        Measured from: 155.016000002623
                   to: 245.552000015974     [s; relative to TRIGTIME]
     T50: 39.6079999804497 +/- 23.4914891989609
        Measured from: 168.404000014067
                   to: 208.011999994516     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 197.863999992609     
                   to: 198.863999992609     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 150.576000005007     
                   to: 265.027999997139     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     7.446305   0.687042   0.248283  -0.099829
           0.174079   0.150645   0.139314   0.139066 [error]
 Peak      0.096636   0.029756   0.034217   0.022011
           0.016175   0.014089   0.013326   0.012960 [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 3.07e-06 3.80e-07 2.03e-08 1.14e-09 3.48e-06 3.47e-06   erg/cm2
              Error 3.41e-07 7.78e-08 1.02e-08 1.00e-09 3.49e-07 3.48e-07   erg/cm2
Peak flux Power-law 1.23e+00 3.73e-01 6.18e-02 1.18e-02 1.68e+00 1.68e+00   ph/cm2/s
              Error 3.66e-01 1.84e-01 7.41e-02 3.21e-02 4.40e-01 4.43e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.13e-06 2.74e-07 4.54e-10 1.06e-15 3.40e-06 3.47e-06   erg/cm2
              Error 3.67e-07 9.31e-08 3.84e-09 1.48e-11 3.68e-07 0.00e+00   erg/cm2
Peak flux Cutoff-PL 1.23e+00 3.73e-01 6.17e-02 1.17e-02 1.68e+00 1.68e+00   ph/cm2/s
              Error 3.65e-01 1.84e-01 7.40e-02 3.18e-02 4.40e-01 4.43e-01   ph/cm2/s
 
Fluence        Band 3.13e-06 2.86e-07 6.22e-09 1.39e-10 3.43e-06 3.39e-06   erg/cm2
              Error 3.75e-07 8.95e-08 8.55e-09 4.34e-10 3.33e-07 3.29e-07   erg/cm2
Peak flux      Band 1.24e+00 3.68e-01 5.97e-02 1.19e-02 1.71e+00 1.49e+00   ph/cm2/s
              Error 3.48e-01 1.32e-01 4.51e-02 1.82e-02 4.52e-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    6.136    0.444    -      -           2.14e-04 8.33e-05   55.622 57
CPL   1.756    0.000       1.1    0.0      9.52e-01 1.63e+03   50.615 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    3.591    1.079    -      -           3.85e-03 4.00e-03   69.974 57
CPL   1.916    0.448       1.0    0.0      1.02e-01 1.89e-01   71.891  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  114.452  150.576  265.028
T90    90.536  155.016  245.552
T50    39.608  168.404  208.012
Peak    1.000  197.864  198.864

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  241.8758 -19.7155 0.0133   43.4  -53.8       5.9366    14.4  TRIG_00302777       
------------------------------------------
 
Foreground time interval of the image:
150.576 265.028 (delta_t = 114.452 [sec])
Background time interval of the image:
-119.000 150.576 (delta_t = 269.576 [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  150.576 sec. to  265.028 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 6.13566     ( -0.348951   0.539047 )
Norm@50keV  : 2.144532E-04    ( -8.644995E-05   8.016035E-05) )
------------------------------------------------------------
 Chi-Squared =      55.62210     using    59 PHA bins.
 Reduced chi-squared =     0.9758264     for     57 degrees of freedom
 Null hypothesis probability = 0.527
 
Photon flux (15-150 keV)    in 114.5 sec: 1.02137 ( -0.108862  0.10913 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.47512e-06 ( -3.4792e-07  3.49099e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  150.576 sec. to  265.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.75613     (     )
Epeak [keV] : 1.13913      (   )
Norm@50keV  : 0.951979    ( -10.3569   3242.78 )
------------------------------------------------------------
 Chi-Squared =      50.61524     using    59 PHA bins.
 Reduced chi-squared =     0.9038436     for     56 degrees of freedom
 Null hypothesis probability = 0.678
 
Photon flux (15-150 keV)    in 114.5 sec: 1.02002 ( -0.108651  0.10892 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.40407e-06 ( -3.70499e-07  3.66011e-07 ) ergs/cm2
 
Band function
Time interval is from  150.576 sec. to  265.028 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.23968   ( -0.760323   1.47138 )
beta        : -6.22579    ( -0.440095   0.429877 )
Epeak [keV] : 304.015      ( -303.915 9695.98 )
Norm@50keV   : 2.686459E-02    ( -9.307336E-03   1.285360E-02) )
------------------------------------------------------------
 Chi-Squared =      55.50472     using    59 PHA bins.
 Reduced chi-squared =      1.009177     for     55 degrees of freedom
 Null hypothesis probability = 0.456
 
Photon flux (15-150 keV)    in 114.5 sec: 1.01612 ( -0.113273  0.11039 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.43452e-06 ( -3.33413e-07  3.32233e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from  197.864 sec. to  198.864 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.59085     ( -0.931321   1.22602 )
Norm@50keV  : 3.850246E-03    ( -3.850246E-03   4.149220E-03) )
------------------------------------------------------------
 Chi-Squared =      69.97375     using    59 PHA bins.
 Reduced chi-squared =      1.227610     for     57 degrees of freedom
 Null hypothesis probability = 0.116
 
Photon flux (15-150 keV)    in 1.000 sec: 1.67743 ( -0.44047  0.43962 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.41349e-08 ( -2.108e-08  2.45484e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  197.864 sec. to  198.864 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.91601     ( -0.810931   8.507991E-02) )
Epeak [keV] : 0.997666      (   )
Norm@50keV  : 0.101680    ( -3.658503E-02   0.342402 )
------------------------------------------------------------
 Chi-Squared =      71.89103     using    59 PHA bins.
 but latest trial   1.12172     gives Chi-Squared =   26.9664
 but latest trial  6.287477E-02 gives Chi-Squared =   4.79665
 Reduced chi-squared =      1.283768     for     56 degrees of freedom
 Null hypothesis probability = 7.481E-02
 
Photon flux (15-150 keV)    in 1.000 sec: 1.67637 ( -0.44031  0.43943 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.40909e-08 ( -2.10557e-08  2.45819e-08 ) ergs/cm2
 
Band function
Time interval is from  197.864 sec. to  198.864 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.46122   ( -2.56364   12.4364 )
beta        : -2.90241    ( -1.22710   0.929830 )
Epeak [keV] : 7.82420      ( -7.72420 9992.18 )
Norm@50keV   : 9.699579E-02    ( -0.524307   0.562880 )
------------------------------------------------------------
 Chi-Squared =      71.76531     using    59 PHA bins.
 Reduced chi-squared =      1.304824     for     55 degrees of freedom
 Null hypothesis probability = 6.399E-02
 
Photon flux (15-150 keV)    in 1.000 sec: 1.70530 ( -0.46233  0.44241 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.32995e-08 ( -1.93521e-08  1.70555e-08 ) ergs/cm2
 
Plot creation:
Fri Feb  8 17:51:19 EST 2008