batgrbproduct Analysis for Trigger=302888

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.41
    Process Start Time (local time): Sun Feb 10 21:19:33 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger302888/GCN5_download_cron
======================================================================

  Trigger: 00302888      Segment: 000

  BAT Trigger Time: 224322608   [s; MET]
      Trigger Stop: 224322688   [s; MET]
               UTC: 2008-02-10T07:50:05.435780    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 251.269750345052   Dec: 13.8302696590224  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.85
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    17.85

  Flight Position:   [ source = BAT ]
    RA: 251.269750345052   Dec: 13.8302696590224  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 251.25853796541   Dec: 13.8262996978416  [deg; J2000]  
        { 16h 45m 02.0s , +13d 49' 34.7" }
         +/- 1.09251979962537 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.400064164317257 [arcmin] (formal 1-sigma fit error)
    SNR: 26.8052188019137
    RA  =  16h 45m  2.0s  (251.258538 deg.)
    Dec =  13d 49' 35" (13.826300 deg.)
 
  Angular difference between Flight and Ground position is 0.695317 arcmin
 
  Partial Coding Fraction: 0.734375    [ including projection effects ]

  Duration
     T90: 45.2040000259876 +/- 10.6628934271791
        Measured from: -10.2840000092983
                   to: 34.9200000166893     [s; relative to TRIGTIME]
     T50: 11.7159999907017 +/- 2.30127357206699
        Measured from: -0.00799998641014099
                   to: 11.7080000042915     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.50400000810623     
                   to: 5.50400000810623     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -14.555999994278     
                   to: 47.7199999988079     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.968380   1.114727   0.758388   0.222727
           0.052105   0.053422   0.049685   0.049705 [error]
 Peak      0.047831   0.064249   0.066900   0.017163
           0.007146   0.007548   0.007221   0.006539 [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 3.18e-07 4.97e-07 5.84e-07 1.33e-06 1.79e-06 2.73e-06   erg/cm2
              Error 3.24e-08 2.90e-08 5.07e-08 2.52e-07 1.15e-07 2.90e-07   erg/cm2
Peak flux Power-law 4.63e-01 5.15e-01 4.08e-01 5.36e-01 1.58e+00 1.92e+00   ph/cm2/s
              Error 1.03e-01 6.81e-02 5.84e-02 1.65e-01 1.90e-01 2.33e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.18e-07 4.97e-07 5.84e-07 1.32e-06 1.79e-06 2.72e-06   erg/cm2
              Error 3.24e-08 2.90e-08 5.07e-08 2.50e-07 1.15e-07 2.88e-07   erg/cm2
Peak flux Cutoff-PL 4.63e-01 5.15e-01 4.08e-01 5.32e-01 1.58e+00 1.92e+00   ph/cm2/s
              Error 1.03e-01 6.81e-02 5.85e-02 1.64e-01 1.90e-01 2.32e-01   ph/cm2/s
 
Fluence        Band 3.21e-07 3.75e-06 4.42e-06 1.01e-05 1.35e-05 2.67e-06   erg/cm2
              Error 3.13e-05 3.16e-05 6.48e-05 9.19e-05 1.70e-07 0.00e+00   erg/cm2
Peak flux      Band 4.63e-01 5.15e-01 4.08e-01 5.32e-01 1.58e+00 1.92e+00   ph/cm2/s
              Error 1.03e-01 6.81e-02 4.94e-02 1.78e-01 1.90e-01 3.05e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.766    0.116    -      -           3.11e-03 1.92e-04   43.535 57
CPL   1.765    0.117    9996.6 5000.0      3.12e-03 1.93e-04   43.544 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.334    0.214    -      -           1.32e-02 1.54e-03   42.870 57
CPL   1.258    1.050     510.4    0.0      1.44e-02 1.55e-03   42.909 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: 19.584000 sec.
T50 in the 50-300 keV band: 7.424000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   62.276  -14.556   47.720
T90    45.204  -10.284   34.920
T50    11.716   -0.008   11.708
Peak    1.000    4.504    5.504

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  251.2585 +13.8263 0.0072   32.6   -5.2       3.1176    26.8  TRIG_00302888       
------------------------------------------
 
Foreground time interval of the image:
-14.556  47.720 (delta_t =  62.276 [sec])
Background time interval of the image:
-239.000 -14.556 (delta_t = 224.444 [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  -14.556 sec. to   47.720 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76630     ( -0.115194   0.116955 )
Norm@50keV  : 3.112303E-03    ( -1.931034E-04   1.912082E-04) )
------------------------------------------------------------
 Chi-Squared =      43.53500     using    59 PHA bins.
 Reduced chi-squared =     0.7637718     for     57 degrees of freedom
 Null hypothesis probability = 0.905
 
Photon flux (15-150 keV)    in 62.28 sec: 0.423394 ( -0.025169  0.025316 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78706e-06 ( -1.14377e-07  1.15218e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -14.556 sec. to   47.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76528     ( -0.115805   0.117537 )
Epeak [keV] : 9996.56      ( -9996.55 3.44336 )
Norm@50keV  : 3.116651E-03    ( -1.942585E-04   1.922958E-04) )
------------------------------------------------------------
 Chi-Squared =      43.54424     using    59 PHA bins.
 Reduced chi-squared =     0.7775756     for     56 degrees of freedom
 Null hypothesis probability = 0.888
 
Photon flux (15-150 keV)    in 62.28 sec: 0.423195 ( -0.025157  0.025305 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78693e-06 ( -1.14302e-07  1.15343e-07 ) ergs/cm2
 
Band function
Time interval is from  -14.556 sec. to   47.720 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.43144   ( -8.56856   6.43144 )
beta        : -1.76628    ( -0.117005   0.115157 )
Epeak [keV] : 16.3899      ( -16.2899 9983.61 )
Norm@50keV   : 7.545741E-03    ( -7.545741E-03   42.4580 )
------------------------------------------------------------
 Chi-Squared =      43.53500     using    59 PHA bins.
 Reduced chi-squared =     0.7915455     for     55 degrees of freedom
 Null hypothesis probability = 0.868
 
Photon flux (15-150 keV)    in 62.28 sec: 6.51934 ( -6.51934  58.6561 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.35199e-05 ( -1.35199e-05  0.000170346 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from    4.504 sec. to    5.504 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.33399     ( -0.213664   0.213414 )
Norm@50keV  : 1.319359E-02    ( -1.542394E-03   1.539543E-03) )
------------------------------------------------------------
 Chi-Squared =      42.86969     using    59 PHA bins.
 Reduced chi-squared =     0.7520998     for     57 degrees of freedom
 Null hypothesis probability = 0.917
 
Photon flux (15-150 keV)    in 1.000 sec: 1.58431 ( -0.18934  0.18981 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29256e-07 ( -1.6834e-08  1.7162e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    4.504 sec. to    5.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.25847     ( -0.770037   1.32937 )
Epeak [keV] : 510.424      (   )
Norm@50keV  : 1.435353E-02    ( -1.551015E-03   1.547527E-03) )
------------------------------------------------------------
 Chi-Squared =      42.90940     using    59 PHA bins.
 Reduced chi-squared =     0.7662393     for     56 degrees of freedom
 Null hypothesis probability = 0.901
 
Photon flux (15-150 keV)    in 1.000 sec: 1.58382 ( -0.18928  0.18976 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29332e-07 ( -1.6902e-08  1.7126e-08 ) ergs/cm2
 
Band function
Time interval is from    4.504 sec. to    5.504 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.07114   ( -8.92885   6.07048 )
beta        : -1.33379    ( -8.66621   0.213597 )
Epeak [keV] : 40.6729      ( -40.5729 9959.33 )
Norm@50keV   : 2.523855E-02    ( -1.191046E-02   140.481 )
------------------------------------------------------------
 Chi-Squared =      42.86969     using    59 PHA bins.
 Reduced chi-squared =     0.7794489     for     55 degrees of freedom
 Null hypothesis probability = 0.883
 
Photon flux (15-150 keV)    in 1.000 sec: 1.58382 ( -0.18928  0.18976 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.29178e-07 ( -1.6861e-08  1.7176e-08 ) ergs/cm2
 
Plot creation:
Sun Feb 10 21:46:40 EST 2008