batgrbproduct Analysis for Trigger=238544

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Wed Jan  2 11:58:17 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger238544/GCN5_download_cron
======================================================================

  Trigger: 00238544      Segment: 000

  BAT Trigger Time: 185082788.352   [s; MET]
      Trigger Stop: 185082789.376   [s; MET]
               UTC: 2006-11-13T03:53:06.784600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 298.527197826774   Dec: 35.215734899852  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.25
     Image Trigger?:     NO
     Rate S/N Ratio:     7.48331477354788  [ if not an image trigger ]
     Image S/N Ratio:    7.25

  Flight Position:   [ source = BAT ]
    RA: 298.527197826774   Dec: 35.215734899852  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 298.495405546144   Dec: 35.2715169879109  [deg; J2000]  
        { 19h 53m 58.9s , +35d 16' 17.5" }
         +/- 0.656995942718769 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.212036397921452 [arcmin] (formal 1-sigma fit error)
    SNR: 55.42977452804
    RA  =  19h 53m 58.9s  (298.495406 deg.)
    Dec =  35d 16' 17" (35.271517 deg.)
 
  Angular difference between Flight and Ground position is 3.691741 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 564.38400003314 +/- 51.1344056438196
        Measured from: -1.16800001263618
                   to: 563.216000020504     [s; relative to TRIGTIME]
     T50: 293.016000002623 +/- 26.8693970840958
        Measured from: 85.6240000128746
                   to: 378.640000015497     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.243999987840652     
                   to: 1.24399998784065     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -22.1920000016689     
                   to: 852.712000012398     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     9.988559  12.117864   7.529252   1.272382
           0.146075   0.145576   0.124308   0.104406 [error]
 Peak      0.018230   0.033056   0.027934   0.003095
           0.005011   0.005166   0.004314   0.003387 [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 3.13e-06 4.89e-06 5.74e-06 1.30e-05 1.76e-05 2.68e-05   erg/cm2
              Error 1.36e-07 1.18e-07 1.41e-07 7.69e-07 3.49e-07 8.16e-07   erg/cm2
Peak flux Power-law 1.99e-01 2.06e-01 1.51e-01 1.77e-01 6.24e-01 7.32e-01   ph/cm2/s
              Error 6.09e-02 4.00e-02 3.38e-02 8.06e-02 1.15e-01 1.35e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.92e-06 4.93e-06 5.84e-06 9.59e-06 1.72e-05 2.32e-05   erg/cm2
              Error 1.88e-07 1.23e-07 1.59e-07 1.95e-06 4.15e-07 2.02e-06   erg/cm2
Peak flux Cutoff-PL 1.75e-01 2.20e-01 1.61e-01 9.03e-02 6.10e-01 6.47e-01   ph/cm2/s
              Error 7.20e-02 4.77e-02 4.01e-02 1.08e-01 1.17e-01 1.64e-01   ph/cm2/s
 
Fluence        Band 2.90e-06 4.91e-06 5.83e-06 9.59e-06 1.72e-05 2.53e-05   erg/cm2
              Error 1.86e-07 1.23e-07 1.59e-07 1.95e-06 4.15e-07 0.00e+00   erg/cm2
Peak flux      Band 1.75e-01 2.20e-01 1.61e-01 9.04e-02 6.11e-01 6.47e-01   ph/cm2/s
              Error 7.20e-02 4.78e-02 4.01e-02 1.06e-01 1.17e-01 1.64e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.768    0.041    -      -           2.18e-03 4.31e-05   73.185 57
CPL   1.519    0.174     107.1   61.3      2.81e-03 4.94e-04   66.761 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.450    0.304    -      -           5.06e-03 9.30e-04   62.157 57
CPL   0.758    1.033      92.0 4971.7      1.12e-02 2.59e-02   61.055  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: 220.864000 sec.
T50 in the 50-300 keV band: 98.304000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  874.904  -22.192  852.712
T90   564.384   -1.168  563.216
T50   293.016   85.624  378.640
Peak    1.000    0.244    1.244

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  298.4954 +35.2715 0.0035    0.2  114.8      33.2381    55.4  TRIG_00238544       
------------------------------------------
 
Foreground time interval of the image:
-22.192 852.712 (delta_t = 874.904 [sec])
Background time interval of the image:
-239.352 -22.192 (delta_t = 217.160 [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  -22.192 sec. to  852.712 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76802     ( -4.118025E-02   4.121196E-02) )
Norm@50keV  : 2.177650E-03    ( -4.306412E-05   4.306599E-05) )
------------------------------------------------------------
 Chi-Squared =      73.18492     using    59 PHA bins.
 Reduced chi-squared =      1.283946     for     57 degrees of freedom
 Null hypothesis probability = 7.305E-02
 
Photon flux (15-150 keV)    in 874.9 sec: 0.296436 ( -0.00741  0.007462 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.75634e-05 ( -3.49173e-07  3.4926e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -22.192 sec. to  852.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.51862     ( -0.178959   0.168228 )
Epeak [keV] : 107.137      ( -22.9911 99.5276 )
Norm@50keV  : 2.812934E-03    ( -4.359272E-04   5.518564E-04) )
------------------------------------------------------------
 Chi-Squared =      66.76138     using    59 PHA bins.
 Reduced chi-squared =      1.192168     for     56 degrees of freedom
 Null hypothesis probability = 0.154
 
Photon flux (15-150 keV)    in 874.9 sec: 0.288546 ( -0.008887  0.008959 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.72317e-05 ( -4.1689e-07  4.12603e-07 ) ergs/cm2
 
Band function
Time interval is from  -22.192 sec. to  852.712 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.20508   ( -0.367311   1.05314 )
beta        : -1.86214    ( -7.46156   0.753298 )
Epeak [keV] : 61.6885      ( -60.5051 104.690 )
Norm@50keV   : 4.289423E-03    ( -4.039633E-04   5.886119E-04) )
------------------------------------------------------------
 Chi-Squared =      67.20079     using    59 PHA bins.
 Reduced chi-squared =      1.221833     for     55 degrees of freedom
 Null hypothesis probability = 0.125
 
Photon flux (15-150 keV)    in 874.9 sec: 0.288539 ( -0.00889  0.008985 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.72129e-05 ( -4.16102e-07  4.13653e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    0.244 sec. to    1.244 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45048     ( -0.302466   0.304918 )
Norm@50keV  : 5.060257E-03    ( -9.336309E-04   9.266352E-04) )
------------------------------------------------------------
 Chi-Squared =      62.15730     using    59 PHA bins.
 Reduced chi-squared =      1.090479     for     57 degrees of freedom
 Null hypothesis probability = 0.298
 
Photon flux (15-150 keV)    in 1.000 sec: 0.623683 ( -0.114542  0.114774 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.84202e-08 ( -9.6933e-09  9.8356e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.244 sec. to    1.244 sec.
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.758371     ( -1.40864   0.658007 )
Epeak [keV] : 92.0326      ( -35.4207 9907.97 )
Norm@50keV  : 1.121381E-02    ( -1.121381E-02   4.050283E-02) )
------------------------------------------------------------
 Chi-Squared =      61.05460     using    59 PHA bins.
 but latest trial   1.82242     gives Chi-Squared =   5.08338
 Reduced chi-squared =      1.090261     for     56 degrees of freedom
 Null hypothesis probability = 0.299
 
Photon flux (15-150 keV)    in 1.000 sec: 0.610464 ( -0.116615  0.116729 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.67367e-08 ( -1.01221e-08  1.02674e-08 ) ergs/cm2
 
Band function
Time interval is from    0.244 sec. to    1.244 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.763736   ( -9.23626   1.20913 )
beta        : -8.68996    ( -1.31004   7.47083 )
Epeak [keV] : 92.4146      ( -35.8331 9907.58 )
Norm@50keV   : 1.113960E-02    ( -1.113959E-02   4.072248E-02) )
------------------------------------------------------------
 Chi-Squared =      61.05463     using    59 PHA bins.
 Reduced chi-squared =      1.110084     for     55 degrees of freedom
 Null hypothesis probability = 0.267
 
Photon flux (15-150 keV)    in 1.000 sec: 0.610500 ( -0.117411  0.116976 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.67131e-08 ( -1.01284e-08  1.02644e-08 ) ergs/cm2
 
Plot creation:
Wed Jan  2 12:19:47 EST 2008