Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jun 24 00:37:32 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger252588
======================================================================

  Trigger: 00252588      Segment: 000

  BAT Trigger Time: 188450933.76   [s; MET]
      Trigger Stop: 188450937.856   [s; MET]
               UTC: 2006-12-22T03:28:52.110840    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 358.243358155449   Dec: 46.5262619462849  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.21
     Image Trigger?:     NO
     Rate S/N Ratio:     13.3790881602597  [ if not an image trigger ]
     Image S/N Ratio:    7.21

  Analysis Position:   [ source = BAT ]
    RA: 358.243358155449   Dec: 46.5262619462849  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 358.237373942495   Dec: 46.5158302015211  [deg; J2000]  
        { 23h 52m 57.0s , +46d 30' 57.0" }
         +/- 1.56229441093894 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.556574715650855 [arcmin] (formal 1-sigma fit error)
    SNR: 16.0810449912385
 
  Angular difference between the analysis and refined position is 0.672901 arcmin
 
  Partial Coding Fraction: 0.703125    [ including projection effects ]

  Duration
     T90: 100 +/- 12.1655250605964
        Measured from: -4.75999999046326
                   to: 95.2400000095367     [s; relative to TRIGTIME]
     T50: 29 +/- 1
        Measured from: 59.2400000095367
                   to: 88.2400000095367     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 86.2400000095367     
                   to: 87.2400000095367     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -98.7599999904633     
                   to: 117.240000009537     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.268251   4.724640   4.007228   1.124115
           0.079271   0.083356   0.074353   0.062220 [error]
 Peak      0.160070   0.332253   0.388398   0.125317
           0.007018   0.008908   0.009644   0.006824 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  216.000  -98.760  117.240
T90   100.000   -4.760   95.240
T50    29.000   59.240   88.240
Peak    1.000   86.240   87.240
 
 
====== 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      -1.331    -0.043      0.043       -           -               -         4.02e-03     -8.89e-05          8.89e-05      50.380   57
CPL     -1.275    -0.074      0.149      691.353    -434.505      -691.353      4.25e-03     -2.96e-04          6.29e-04      50.510   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -0.886     -0.051     0.051       -           -               -         6.59e-02     -1.97e-03          1.96e-03      66.980   57
CPL     -0.487     -0.207     0.217      225.828     -58.494       169.316      9.78e-02     -1.77e-02          2.26e-02      55.710   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   9.46e-07  1.93e-06  3.06e-06  1.08e-05  8.51e-06  1.68e-05   erg/cm2
      90%_error_low -4.51e-08 -5.31e-08 -7.85e-08 -6.51e-07 -1.96e-07 -6.83e-07   erg/cm2
      90%_error_hi   4.61e-08  5.29e-08  7.83e-08  6.81e-07  1.96e-07  7.08e-07   erg/cm2
Peak flux       PL   6.83e-04  1.03e-02  8.96e-02  1.03e+01  3.97e-01  1.01e+01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
Fluence        CPL   8.35e-07  1.93e-06  3.07e-06  1.08e-05  8.49e-06  1.62e-05   erg/cm2
      90%_error_low -5.69e-08 -5.62e-08 -8.49e-08 -2.44e-06 -2.12e-07 -1.87e-06   erg/cm2
      90%_error_hi   3.62e-08  5.20e-08  9.40e-08  4.02e-07  2.06e-07  7.66e-07   erg/cm2
Peak flux      CPL   1.35e+00  2.23e+00  2.50e+00  3.30e+00  7.45e+00  9.38e+00   ph/cm2/s
      90%_error_low -1.18e-01 -8.79e-02 -9.65e-02 -5.54e-01 -2.31e-01 -5.98e-01   ph/cm2/s
      90%_error_hi   1.21e-01  8.82e-02  9.73e-02  6.97e-01  2.32e-01  7.21e-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
  358.2374    46.5158   0.0119    28.0611  -136.1159         2.4645439     16.081 TRIG_00252588                 
 
Foreground time interval of the image:
-98.760  37.141 (delta_t = 135.901 [sec])
Background time interval of the image:
-239.760 -98.760 (delta_t = 141.000 [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  -98.760 sec. to  117.240 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33102     ( -0.0428468   0.0429588 )
Norm@50keV  : 4.01615E-03    ( -8.8938e-05   8.8881e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.38 using 59 PHA bins.
# Reduced chi-squared =         0.8838 for     57 degrees of freedom 
# Null hypothesis probability =   7.199914e-01
 
Photon flux (15-150 keV)    in 216 sec: 0.481989 ( -0.011889  0.011943 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.51027e-06 ( -1.96007e-07  1.96433e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -98.760 sec. to  117.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27485     ( -0.0588818   0.164032 )
Epeak [keV] : 691.353      ( -741.179 -998.027 )
Norm@50keV  : 4.24954E-03    ( -0.000231249   0.000693485 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.51 using 59 PHA bins.
# Reduced chi-squared =         0.9020 for     56 degrees of freedom 
# Null hypothesis probability =   6.818482e-01
 
Photon flux (15-150 keV)    in 216 sec: 0.480996 ( -0.013916  0.013003 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.48856e-06 ( -2.11738e-07  2.0572e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   86.240 sec. to   87.240 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.885543     ( -0.050904   0.0512418 )
Norm@50keV  : 6.58759E-02    ( -0.00196551   0.0019629 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.98 using 59 PHA bins.
# Reduced chi-squared =          1.175 for     57 degrees of freedom 
# Null hypothesis probability =   1.718401e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.397252 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.43567e-07 ( -2.39026e-08  2.39359e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   86.240 sec. to   87.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.486808     ( -0.206963   0.217109 )
Epeak [keV] : 225.828      ( -58.4936 169.316 )
Norm@50keV  : 9.78266E-02    ( -0.0177129   0.0226399 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.71 using 59 PHA bins.
# Reduced chi-squared =         0.9948 for     56 degrees of freedom 
# Null hypothesis probability =   4.858729e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.45438 ( -0.2315  0.2316 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.32656e-07 ( -2.50036e-08  2.49441e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 100.0 sec.
Hardness ratio (energy fluence ratio) = 1.58997390557

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

    S(15-50 keV)  = 2.8728883e-06
S(50-150 keV) = 5.637449e-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 = -3.842128353345811E-01, IMY = 3.695306085312690E-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:
-239.760000 -98.760000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  1.8210  11.5445    2.2  57.0 -167.4   2.0990   5.2 ------	UNKNOWN                       
355.4036  26.3389    3.3  46.0 -152.5   0.6926   3.5 ------	UNKNOWN                       
253.9772  68.0956    3.0  48.4  -50.0   1.7795   3.9 ------	UNKNOWN

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

    Time interval of the image:
-98.760000 37.140590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 13.6422  15.2657    2.2  49.8 -179.5   1.5380   5.2 ------	UNKNOWN                       
358.2374  46.5158    0.7  28.1 -136.1   2.4644  16.1 ------	UNKNOWN                       
351.0864  33.1836    2.3  42.0 -142.8   1.2329   5.0 ------	UNKNOWN                       
350.5586  20.1603    2.9  53.5 -151.1   1.9174   3.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
89.940590 482.303700
540.240000 962.293000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0810  41.1625   27.9  35.9  -62.0  -0.3053  -0.4   12.7	Cyg X-3                       
326.1993  38.2788    4.7  24.8  -79.9   1.3884   2.5    2.9	Cyg X-2                       
248.8050  75.8802    3.5  49.6    0.3   2.6925   3.3 ------	UNKNOWN                       
358.2439  46.4906    1.7   0.0 -177.1   2.5645   6.8 ------	UNKNOWN                       
343.0783  -5.7543    3.8  54.0 -143.3   7.8668   3.1 ------	UNKNOWN