Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 19 13:30:44 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger373458
======================================================================

  Trigger: 00373458      Segment: 000

  BAT Trigger Time: 277767409.856   [s; MET]
      Trigger Stop: 277767410.88   [s; MET]
               UTC: 2009-10-20T21:36:44.667340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 175.715548275446   Dec: 50.9720400823411  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.7
     Image Trigger?:     NO
     Rate S/N Ratio:     32.4191301548947  [ if not an image trigger ]
     Image S/N Ratio:    17.7

  Analysis Position:   [ source = BAT ]
    RA: 175.715548275446   Dec: 50.9720400823411  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 175.726835303108   Dec: 50.9774125819927  [deg; J2000]  
        { 11h 42m 54.4s , +50d 58' 38.7" }
         +/- 0.757587947777491 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.243574151077148 [arcmin] (formal 1-sigma fit error)
    SNR: 45.2227397624376
 
  Angular difference between the analysis and refined position is 0.534551 arcmin
 
  Partial Coding Fraction: 0.4335938    [ including projection effects ]

  Duration
     T90: 38.9199999570847 +/- 4.88857609247848
        Measured from: -4.08399999141693
                   to: 34.8359999656677     [s; relative to TRIGTIME]
     T50: 9.59599995613098 +/- 1.17872472366142
        Measured from: 1.1599999666214
                   to: 10.7559999227524     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.14399999380112     
                   to: 2.14399999380112     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -8.47600001096725     
                   to: 48.2639999985695     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.545767   2.029628   1.723886   0.471002
           0.058557   0.063002   0.057686   0.052382 [error]
 Peak      0.106396   0.163347   0.178704   0.062414
           0.010333   0.011840   0.011522   0.009940 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   56.740   -8.476   48.264
T90    38.920   -4.084   34.836
T50     9.596    1.160   10.756
Peak    1.000    1.144    2.144
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.532    -0.067      0.067       -           -               -         7.10e-03     -2.52e-04          2.52e-04      41.390   57
CPL     -1.451    -0.137      0.261      362.920    -362.920      -362.920      7.75e-03     -8.62e-04          2.43e-03      41.080   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.184     -0.124     0.125       -           -               -         3.57e-02     -2.53e-03          2.53e-03      64.460   57
CPL     -1.095     -0.151     0.426      563.294    -563.294      -563.294      3.93e-02     -5.95e-03          2.13e-02      64.490   56
 
 
=== 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         PL   5.30e-07  9.55e-07  1.32e-06  3.80e-06  3.80e-06  6.60e-06   erg/cm2
      90%_error_low -3.60e-08 -3.80e-08 -5.98e-08 -3.76e-07 -1.44e-07 -4.14e-07   erg/cm2
      90%_error_hi   3.70e-08  3.78e-08  5.96e-08  4.04e-07  1.44e-07  4.36e-07   erg/cm2
Peak flux       PL   1.09e+00  1.32e+00  1.16e+00  1.76e+00  4.18e+00  5.32e+00   ph/cm2/s
      90%_error_low -1.50e-01 -1.13e-01 -9.37e-02 -2.86e-01 -3.08e-01 -3.94e-01   ph/cm2/s
      90%_error_hi   1.56e-01  1.12e-01  9.29e-02  3.19e-01  3.08e-01  3.98e-01   ph/cm2/s
 
Fluence        CPL   5.20e-07  9.60e-07  1.33e-06  3.38e-06  3.78e-06  6.19e-06   erg/cm2
      90%_error_low -4.59e-08 -4.04e-08 -6.39e-08 -9.91e-07 -1.58e-07 -9.98e-07   erg/cm2
      90%_error_hi   3.35e-08  4.15e-08  6.36e-08  9.36e-07  1.57e-07  5.55e-07   erg/cm2
Peak flux      CPL   1.07e+00  1.33e+00  1.17e+00  1.76e+00  4.17e+00  5.23e+00   ph/cm2/s
      90%_error_low -1.84e-01 -1.19e-01 -1.04e-01 -7.28e-01 -3.18e-01 -7.10e-01   ph/cm2/s
      90%_error_hi   1.35e-01  1.18e-01  1.08e-01  1.73e-01  3.12e-01  4.59e-01   ph/cm2/s
 
======================================================================
  • Special notes of this burst




    Image

    Pre-slew 15.0-350.0 keV image (Event data)

    #   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  175.7268    50.9774   0.0043    41.1310  -148.6576         4.5729407     45.223 TRIG_00373458                 
 
Foreground time interval of the image:
 -8.476  11.645 (delta_t =  20.121 [sec])
Background time interval of the image:
-239.856  -8.476 (delta_t = 231.380 [sec])




    Light Curves

    Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

    Full-time range; 1 s binning

    Bokeh Plot

    Other quick-look light curves:




    Spectra

    Notes:

    Time averaged spectrum fit using the average DRM

    Power-law model
    Time interval is from   -8.476 sec. to   48.264 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53238     ( -0.0672185   0.0670696 )
Norm@50keV  : 7.09547E-03    ( -0.000251872   0.000251693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.39 using 59 PHA bins.
# Reduced chi-squared =         0.7262 for     57 degrees of freedom 
# Null hypothesis probability =   9.403484e-01
 
Photon flux (15-150 keV)    in 56.74 sec: 0.893756 ( -0.034267  0.034418 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.8004e-06 ( -1.43784e-07  1.44167e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -8.476 sec. to   48.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.4508     ( -0.13709   0.260695 )
Epeak [keV] : 362.920      ( -362.833 -362.833 )
Norm@50keV  : 7.74824E-03    ( -0.000862608   0.00243204 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.08 using 59 PHA bins.
# Reduced chi-squared =         0.7336 for     56 degrees of freedom 
# Null hypothesis probability =   9.324375e-01
 
Photon flux (15-150 keV)    in 56.74 sec: 0.888633 ( -0.037466  0.036261 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.77902e-06 ( -1.58014e-07  1.56656e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from    1.144 sec. to    2.144 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.18388     ( -0.123677   0.125133 )
Norm@50keV  : 3.56719E-02    ( -0.00252896   0.00252775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.46 using 59 PHA bins.
# Reduced chi-squared =          1.131 for     57 degrees of freedom 
# Null hypothesis probability =   2.319313e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.17792 ( -0.30766  0.3083 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.63614e-07 ( -2.8116e-08  2.82452e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    1.144 sec. to    2.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17927     ( -0.14584   0.430777 )
Epeak [keV] : 9996.56      ( -9996.07 -9996.07 )
Norm@50keV  : 3.58490E-02    ( -0.0025366   0.0246943 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.46 using 59 PHA bins.
# Reduced chi-squared =          1.151 for     56 degrees of freedom 
# Null hypothesis probability =   2.048061e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.17361 ( -0.31818  0.31222 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.62443e-07 ( -2.8694e-08  2.84249e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 38.92 sec.
Hardness ratio (energy fluence ratio) = 1.38283376392

    S(15-50 keV) vs. S(50-150 keV) plot 

    S(15-50 keV)  = 1.4846365e-06
S(50-150 keV) = 2.3157403e-06

    The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.




    Mask shadow pattern 

    IMX = -7.458696005950929E-01, IMY = 4.542515287686889E-01

    Spacecraft aspect plot

    Bright source in the pre-burst/pre-slew/post-slew images

    Pre-burst image of 15-350 keV band 

    Time interval of the image:
-239.856000 -8.476000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6306  22.0134    0.5  36.2   60.8   9.9748  23.8    0.2	Crab                          
133.8005  -4.4349    3.4  40.8  -36.3   1.0027   3.3 ------	UNKNOWN

    Pre-slew background subtracted image of 15-350 keV band 

    Time interval of the image:
-8.476000 11.644600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.4695  22.0938    3.6  36.3   61.0  -0.3897  -3.2   10.3	Crab                          
102.7810  -8.5080    2.3  47.2    8.1   0.5751   5.1 ------	UNKNOWN                       
175.7266  50.9772    0.3  41.1 -148.7   4.5866  45.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
69.844600 962.279700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3741  35.3187    5.2  56.6 -164.2   4.1390   2.2    4.3	Her X-1                       
274.5661  63.2862    3.5  49.4  158.2   4.4995   3.3 ------	UNKNOWN                       
218.2631  61.0869    3.0  25.3  172.5   1.8261   3.9 ------	UNKNOWN                       
144.3834  23.7437    2.4  36.4   -4.2   3.0165   4.8 ------	UNKNOWN                       
195.0593  47.2887    3.2  13.2 -138.8   1.4935   3.6 ------	UNKNOWN                       
256.0619  32.8345    3.8  59.4 -163.2  12.5035   3.0 ------	UNKNOWN                       
155.0810   0.0771    3.5  53.8  -31.7   6.3342   3.3 ------	UNKNOWN