batgrbproduct Analysis for Trigger=208275

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Mon Dec 31 21:58:40 EST 2007
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger208275/GCN5_download_cron
======================================================================

  Trigger: 00208275      Segment: 000

  BAT Trigger Time: 168283482.176   [s; MET]
      Trigger Stop: 168283482.624   [s; MET]
               UTC: 2006-05-02T17:24:41.007100    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 64 ms to TRIGTIME + 320 ms

  BAT 
    RA: 278.935719107924   Dec: 52.6321691479945  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.47
     Image Trigger?:     NO
     Rate S/N Ratio:     32.9696830436691  [ if not an image trigger ]
     Image S/N Ratio:    11.47

  Flight Position:   [ source = BAT ]
    RA: 278.935719107924   Dec: 52.6321691479945  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 278.964392202846   Dec: 52.6273406168922  [deg; J2000]  
        { 18h 35m 51.5s , +52d 37' 38.4" }
         +/- 1.76760948588134 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.660978681590997 [arcmin] (formal 1-sigma fit error)
    SNR: 13.4806038482242
    RA  =  18h 35m 51.5s  (278.964392 deg.)
    Dec =  52d 37' 38" (52.627341 deg.)
 
  Angular difference between Flight and Ground position is 1.083655 arcmin
 
  Partial Coding Fraction: 0.921875    [ including projection effects ]

  Duration
     T90: 0.143999993801117 +/- 0.0357770935043183
        Measured from: 0.0239999890327454
                   to: 0.167999982833862     [s; relative to TRIGTIME]
     T50: 0.0479999780654907 +/- 0.0160000026226044
        Measured from: 0.0399999916553497
                   to: 0.0879999697208405     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.388000011444092     
                   to: 0.611999988555908     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0239999890327454     
                   to: 0.184000015258789     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.008610   0.024807   0.024583   0.007125
           0.002472   0.002709   0.002684   0.002167 [error]
 Peak      0.009100   0.024980   0.025072   0.007380
           0.002528   0.002787   0.002747   0.002224 [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 3.58e-09 8.80e-09 1.73e-08 8.41e-08 4.67e-08 1.00e-07   erg/cm2
              Error 8.40e-10 1.28e-09 2.30e-09 2.52e-08 6.07e-09 0.00e+00   erg/cm2
Peak flux Power-law 6.66e-01 8.94e-01 8.82e-01 1.56e+00 2.95e+00 4.01e+00   ph/cm2/s
              Error 1.59e-01 1.34e-01 1.14e-01 4.19e-01 3.69e-01 5.22e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.71e-09 9.85e-09 1.97e-08 2.18e-08 4.44e-08 4.58e-08   erg/cm2
              Error 1.02e-09 1.64e-09 3.02e-09 2.87e-08 6.70e-09 0.00e+00   erg/cm2
Peak flux Cutoff-PL 5.08e-01 9.73e-01 1.01e+00 5.99e-01 2.87e+00 3.09e+00   ph/cm2/s
              Error 1.94e-01 1.63e-01 1.56e-01 4.91e-01 3.79e-01 5.96e-01   ph/cm2/s
 
Fluence        Band 2.54e-09 1.02e-08 1.89e-08 4.46e-08 4.45e-08 4.78e-08   erg/cm2
              Error 1.26e-09 1.64e-09 2.98e-09 2.31e-08 6.33e-09 0.00e+00   erg/cm2
Peak flux      Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
              Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.024    0.197    -      -           2.72e-02 3.36e-03   47.365 57
CPL  -0.246    1.123      97.5   77.3      1.06e-01 1.77e-01   42.044 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.019    0.198    -      -           2.56e-02 3.14e-03   47.267 57
CPL  -0.156    1.096     102.0  101.8      8.95e-02 1.43e-01   42.552 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    0.160    0.024    0.184
T90     0.144    0.024    0.168
T50     0.048    0.040    0.088
Peak    1.000   -0.388    0.612

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  278.9644 +52.6273 0.0143   23.2   -2.3       0.0673    13.5  TRIG_00208275       
------------------------------------------
 
Foreground time interval of the image:
 -0.040   0.120 (delta_t =   0.160 [sec])
Background time interval of the image:
-239.240  -0.040 (delta_t = 239.200 [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   -0.040 sec. to    0.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02377     ( -0.200394   0.193444 )
Norm@50keV  : 2.724655E-02    ( -3.361298E-03   3.350206E-03) )
------------------------------------------------------------
 Chi-Squared =      47.36457     using    59 PHA bins.
 Reduced chi-squared =     0.8309574     for     57 degrees of freedom
 Null hypothesis probability = 0.815
 
Photon flux (15-150 keV)    in 0.1600 sec: 3.14126 ( -0.39469  0.39551 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.67312e-08 ( -6.03376e-09  6.10608e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.040 sec. to    0.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.246171     ( -1.27643   0.968626 )
Epeak [keV] : 97.5459      ( -24.6801 130.010 )
Norm@50keV  : 0.106385    ( -6.787796E-02   0.286352 )
------------------------------------------------------------
 Chi-Squared =      42.04450     using    59 PHA bins.
 Reduced chi-squared =     0.7507946     for     56 degrees of freedom
 Null hypothesis probability = 0.917
 
Photon flux (15-150 keV)    in 0.1600 sec: 3.05536 ( -0.40505  0.40375 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.43816e-08 ( -6.72752e-09  6.66832e-09 ) ergs/cm2
 
Band function
Time interval is from   -0.040 sec. to    0.120 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.844916   ( -10.6665   4.33197 )
beta        : -1.02378    ( -8.22173   0.658213 )
Epeak [keV] : 56.5528      ( -79.4627 9920.43 )
Norm@50keV   : 4.449632E-02    ( -0.122350   506.460 )
------------------------------------------------------------
 Chi-Squared =      47.36457     using    59 PHA bins.
 Reduced chi-squared =     0.8611740     for     55 degrees of freedom
 Null hypothesis probability = 0.758
 
Photon flux (15-150 keV)    in 0.1600 sec: 3.02526 ( -0.40279  0.3798 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.44976e-08 ( -6.28416e-09  6.37728e-09 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.040 sec. to    0.136 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.01936     ( -0.201286   0.194301 )
Norm@50keV  : 2.561557E-02    ( -3.143614E-03   3.133224E-03) )
------------------------------------------------------------
 Chi-Squared =      47.26699     using    59 PHA bins.
 Reduced chi-squared =     0.8292455     for     57 degrees of freedom
 Null hypothesis probability = 0.818
 
Photon flux (15-150 keV)    in 0.1760 sec: 2.95255 ( -0.36894  0.36946 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.84473e-08 ( -6.28285e-09  6.26701e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.040 sec. to    0.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.155598     ( -1.24707   0.945345 )
Epeak [keV] : 102.023      ( -27.4346 176.134 )
Norm@50keV  : 8.945083E-02    ( -5.605596E-02   0.229111 )
------------------------------------------------------------
 Chi-Squared =      42.55204     using    59 PHA bins.
 Reduced chi-squared =     0.7598578     for     56 degrees of freedom
 Null hypothesis probability = 0.907
 
Photon flux (15-150 keV)    in 0.1760 sec: 2.87347 ( -0.37946  0.37778 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.6234e-08 ( -6.99406e-09  6.78022e-09 ) ergs/cm2
 
Band function
Time interval is from   -0.040 sec. to    0.136 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.827865   ( -12.9622   2.03647 )
beta        : -1.01936    ( -0.308071   0.315361 )
Epeak [keV] : 63.3629      (   )
Norm@50keV   : 4.194120E-02    (     )
------------------------------------------------------------
 Chi-Squared =      47.26699     using    59 PHA bins.
 Reduced chi-squared =     0.8593999     for     55 degrees of freedom
 Null hypothesis probability = 0.761
 
Photon flux (15-150 keV)    in 0.1760 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Plot creation:
Mon Dec 31 22:28:16 EST 2007