Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan  4 09:39:42 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger621229
======================================================================

  Trigger: 00621229      Segment: 000

  BAT Trigger Time: 440079253.984   [s; MET]
      Trigger Stop: 440079254.048   [s; MET]
               UTC: 2014-12-12T12:14:01.076940    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 39.1608986244416   Dec: 18.1511958647858  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.02
     Image Trigger?:     NO
     Rate S/N Ratio:     30.9838667696593  [ if not an image trigger ]
     Image S/N Ratio:    11.02

  Analysis Position:   [ source = BAT ]
    RA: 39.1608986244416   Dec: 18.1511958647858  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 39.1670914550982   Dec: 18.1628262126047  [deg; J2000]  
        { 02h 36m 40.1s , +18d 09' 46.2" }
         +/- 1.86749151919089 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.66770374222077 [arcmin] (formal 1-sigma fit error)
    SNR: 12.4625249175311
 
  Angular difference between the analysis and refined position is 0.782056 arcmin
 
  Partial Coding Fraction: 0.5859375    [ including projection effects ]

  Duration
     T90: 0.287999987602234 +/- 0.0973241625432712
        Measured from: 0
                   to: 0.287999987602234     [s; relative to TRIGTIME]
     T50: 0.0800000429153442 +/- 0.0320000052452087
        Measured from: 0.015999972820282
                   to: 0.0960000157356262     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.324000000953674     
                   to: 0.675999999046326     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.335999965667725     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.040707   0.044029   0.043562   0.007425
           0.005843   0.006356   0.005729   0.003880 [error]
 Peak      0.042602   0.057932   0.048235   0.003536
           0.008462   0.008942   0.007802   0.006201 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.336    0.000    0.336
T90     0.288    0.000    0.288
T50     0.080    0.016    0.096
Peak    1.000   -0.324    0.676
 
 
====== 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      -1.604    -0.231      0.220       -           -               -         2.31e-02     -3.48e-03          3.43e-03      59.020   57
CPL     -1.146    -0.433      0.939       94.865      N/A           N/A         3.97e-02        N/A               N/A         58.030   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      -1.513     -0.278     0.269       -           -               -         9.79e-03     -1.71e-03          1.69e-03      57.330   57
CPL     -0.481     -1.115     1.509       72.757     -20.801       -72.757      3.30e-02     -3.30e-02          1.53e-01      54.910   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   1.09e-08  1.88e-08  2.48e-08  6.62e-08  7.25e-08  1.21e-07   erg/cm2
      90%_error_low -2.26e-09 -2.68e-09 -4.81e-09 -2.27e-08 -1.16e-08 -2.80e-08   erg/cm2
      90%_error_hi   2.35e-09  2.67e-09  4.74e-09  2.83e-08  1.17e-08  3.22e-08   erg/cm2
Peak flux       PL   4.08e-01  4.07e-01  2.86e-01  3.17e-01  1.23e+00  1.42e+00   ph/cm2/s
      90%_error_low -1.04e-01 -7.04e-02 -6.21e-02 -1.18e-01 -2.04e-01 -2.41e-01   ph/cm2/s
      90%_error_hi   1.11e-01  6.98e-02  6.15e-02  1.52e-01  2.05e-01  2.43e-01   ph/cm2/s
 
Fluence        CPL   1.02e-08  2.00e-08  2.60e-08  3.61e-08  7.16e-08  9.23e-08   erg/cm2
      90%_error_low -2.61e-09 -3.32e-09 -5.37e-09 -2.36e-08 -1.20e-08 -2.68e-08   erg/cm2
      90%_error_hi   2.63e-09  3.47e-09  5.61e-09  3.94e-08  1.20e-08  4.25e-08   erg/cm2
Peak flux      CPL   3.43e-01  4.51e-01  3.10e-01  1.19e-01  1.19e+00  1.22e+00   ph/cm2/s
      90%_error_low -1.26e-01 -8.60e-02 -7.22e-02 -1.19e-01 -2.10e-01 -2.32e-01   ph/cm2/s
      90%_error_hi   1.32e-01  9.11e-02  7.46e-02  2.24e-01  2.10e-01  2.87e-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
   39.1671    18.1628   0.0155    22.2107    76.8604         0.1456588     12.463 TRIG_00621229                 
 
Foreground time interval of the image:
  0.000   0.336 (delta_t =   0.336 [sec])
Background time interval of the image:
-239.984   0.000 (delta_t = 239.984 [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    0.000 sec. to    0.336 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60425     ( -0.231131   0.219852 )
Norm@50keV  : 2.30658E-02    ( -0.00348168   0.00343023 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.02 using 59 PHA bins.
# Reduced chi-squared =          1.035 for     57 degrees of freedom 
# Null hypothesis probability =   4.015232e-01
 
Photon flux (15-150 keV)    in 0.336 sec: 2.96806 ( -0.42008  0.42022 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.2455e-08 ( -1.15996e-08  1.16785e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from    0.000 sec. to    0.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.14621     ( -0.4328   0.939046 )
Epeak [keV] : 94.8648      (   )
Norm@50keV  : 3.96550E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.03 using 59 PHA bins.
# Reduced chi-squared =          1.036 for     56 degrees of freedom 
# Null hypothesis probability =   4.003087e-01
 
Photon flux (15-150 keV)    in 0.336 sec: 2.95217 ( -0.4218  0.4216 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.15583e-08 ( -1.20346e-08  1.19634e-08 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   -0.324 sec. to    0.676 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51297     ( -0.278506   0.269401 )
Norm@50keV  : 9.78945E-03    ( -0.00170895   0.00168871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.33 using 59 PHA bins.
# Reduced chi-squared =          1.006 for     57 degrees of freedom 
# Null hypothesis probability =   4.626793e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.22645 ( -0.20446  0.20464 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.26873e-08 ( -1.74869e-08  1.7774e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   -0.324 sec. to    0.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.481047     ( -1.1154   1.50935 )
Epeak [keV] : 72.7570      ( -20.8006 -72.757 )
Norm@50keV  : 3.30404E-02    ( -0.0330403   0.153311 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.91 using 59 PHA bins.
# Reduced chi-squared =         0.9805 for     56 degrees of freedom 
# Null hypothesis probability =   5.163141e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.18719 ( -0.209815  0.20957 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.71184e-08 ( -1.81167e-08  1.87899e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = 0.288 sec.
Hardness ratio (energy fluence ratio) = 1.31570948414

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

    S(15-50 keV)  = 2.973163e-08
S(50-150 keV) = 4.272278e-08

    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 = 9.281901866037730E-02, IMY = -3.976206769161882E-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:
-239.984000 0.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
352.4782  60.9590    3.0  55.3   -1.6   3.2225   3.8 ------	UNKNOWN                       
333.1022  18.0061    3.0  44.7  -60.3   3.8254   3.9 ------	UNKNOWN                       
339.4205  -3.4957    3.5  40.7  -93.0   3.4846   3.3 ------	UNKNOWN                       
347.2300 -28.4347    2.8  48.0 -129.1   4.6265   4.2 ------	UNKNOWN

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

    Time interval of the image:
0.000000 0.336000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 39.1671  18.1628    0.9  22.2   76.9   0.1457  12.5 ------	UNKNOWN                       
 43.9570 -14.1574    2.2  34.5  145.3   0.0815   5.3 ------	UNKNOWN                       
 30.8112  20.7328    2.2  16.8   57.8   0.0455   5.1 ------	UNKNOWN                       
 26.8784   0.4764    2.3  12.1  147.9   0.0363   5.0 ------	UNKNOWN                       
 11.4770   3.2586    2.3   8.9 -116.9   0.0378   4.9 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
53.316590 962.111400
1683.016000 1683.416580
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 62.3312  16.3554    2.6  22.2  105.8   2.8774   4.4 ------	UNKNOWN                       
 35.9681  70.6334    3.2  52.5   13.4   8.2328   3.7 ------	UNKNOWN                       
 23.2712  53.1744    2.9  37.1   -1.0   2.8660   4.0 ------	UNKNOWN                       
  4.6260  53.4248    2.2  44.2  -14.2   4.6413   5.2 ------	UNKNOWN                       
 31.9246  -5.9267    3.7  25.1 -148.2   1.7270   3.1 ------	UNKNOWN                       
353.5005  55.8056    2.7  50.9  -16.5   4.8263   4.4 ------	UNKNOWN                       
344.9304  59.4511    3.4  56.6  -14.9   8.1852   3.4 ------	UNKNOWN                       
 29.8134 -39.1277    5.5  57.9 -156.8   9.7260   2.1 ------	UNKNOWN                       
345.4162  45.0769    2.4  51.9  -31.6   9.4045   4.9 ------	UNKNOWN                       
347.8443  30.1421    3.1  47.9  -50.7  11.2316   3.7 ------	UNKNOWN                       
 11.0433 -21.1551    3.1  48.0 -129.0  11.3478   3.7 ------	UNKNOWN