Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Fri Oct 19 18:29:40 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger855434
======================================================================

  Trigger: 00855434      Segment: 000

  BAT Trigger Time: 556743894.464   [s; MET]
      Trigger Stop: 556743896.512   [s; MET]
               UTC: 2018-08-23T19:04:32.988300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 210.349060652558   Dec: 14.8842385340093  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.89
     Image Trigger?:     NO
     Rate S/N Ratio:     11.7473401244707  [ if not an image trigger ]
     Image S/N Ratio:    8.89

  Analysis Position:   [ source = BAT ]
    RA: 210.349060652558   Dec: 14.8842385340093  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 210.358088177704   Dec: 14.90088367325  [deg; J2000]  
        { 14h 01m 25.9s , +14d 54' 03.2" }
         +/- 0.810258969368269 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.165745393539818 [arcmin] (formal 1-sigma fit error)
    SNR: 41.0823937798566
 
  Angular difference between the analysis and refined position is 1.127575 arcmin
 
  Partial Coding Fraction: 0.9296875    [ including projection effects ]

  Duration
     T90: 80.2960000038147 +/- 6.89302403001873
        Measured from: -29.2680000066757
                   to: 51.027999997139     [s; relative to TRIGTIME]
     T50: 30.8960000276566 +/- 1.70345995600386
        Measured from: -8.86000001430511
                   to: 22.0360000133514     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 18.3320000171661     
                   to: 19.3320000171661     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -37.5319999456406     
                   to: 72.0479999780655     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.468258   4.914412   3.423441   0.853641
           0.087758   0.095974   0.085352   0.081318 [error]
 Peak      0.075860   0.104922   0.086222   0.030674
           0.008910   0.009947   0.009027   0.007979 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  109.580  -37.532   72.048
T90    80.296  -29.268   51.028
T50    30.896   -8.860   22.036
Peak    1.000   18.332   19.332
 
 
====== 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      -1.572    -0.051      0.051       -           -               -         7.60e-03     -1.99e-04          1.99e-04      67.430   57
CPL     -1.324    -0.203      0.213      142.290     -42.473       343.556      9.98e-03     -1.95e-03          2.56e-03      63.040   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      -1.383     -0.174     0.173       -           -               -         1.91e-02     -1.96e-03          1.95e-03      50.580   57
CPL     -0.968     -0.541     0.780      121.704      N/A           N/A         3.12e-02        N/A               N/A         49.480   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   1.14e-06  2.00e-06  2.69e-06  7.44e-06  7.82e-06  1.33e-05   erg/cm2
      90%_error_low -5.80e-08 -5.87e-08 -9.11e-08 -5.60e-07 -2.17e-07 -6.14e-07   erg/cm2
      90%_error_hi   5.92e-08  5.86e-08  9.09e-08  5.92e-07  2.18e-07  6.39e-07   erg/cm2
Peak flux       PL   7.01e-01  7.56e-01  5.80e-01  7.28e-01  2.31e+00  2.77e+00   ph/cm2/s
      90%_error_low -1.19e-01 -8.15e-02 -7.47e-02 -1.75e-01 -2.33e-01 -2.90e-01   ph/cm2/s
      90%_error_hi   1.24e-01  8.08e-02  7.41e-02  2.08e-01  2.33e-01  2.94e-01   ph/cm2/s
 
Fluence        CPL   1.08e-06  2.03e-06  2.73e-06  5.22e-06  7.66e-06  1.11e-05   erg/cm2
      90%_error_low -7.42e-08 -6.49e-08 -9.75e-08 -1.25e-06 -2.55e-07 -1.27e-06   erg/cm2
      90%_error_hi   7.55e-08  6.54e-08  9.83e-08  1.73e-06  2.54e-07  1.74e-06   erg/cm2
Peak flux      CPL   6.56e-01  7.89e-01  5.98e-01  4.40e-01  2.27e+00  2.48e+00   ph/cm2/s
      90%_error_low -1.40e-01 -9.70e-02 -8.11e-02 -2.38e-01 -2.42e-01 -3.52e-01   ph/cm2/s
      90%_error_hi   1.43e-01  1.01e-01  8.31e-02  3.52e-01  2.42e-01  4.56e-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
  210.3581    14.9009   0.0047    25.0407   -24.3273        10.2429220     41.082 TRIG_00855434                 
 
Foreground time interval of the image:
-37.532  28.837 (delta_t =  66.369 [sec])
Background time interval of the image:
-60.464 -37.532 (delta_t =  22.932 [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  -37.532 sec. to   72.048 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.57218     ( -0.0507197   0.0506632 )
Norm@50keV  : 7.60179E-03    ( -0.000199154   0.000199078 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.43 using 59 PHA bins.
# Reduced chi-squared =          1.183 for     57 degrees of freedom 
# Null hypothesis probability =   1.623846e-01
 
Photon flux (15-150 keV)    in 109.6 sec: 0.968663 ( -0.027673  0.027758 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.82043e-06 ( -2.17334e-07  2.17986e-07 ) ergs/cm2
    Cutoff power-law model
    Time interval is from  -37.532 sec. to   72.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.32359     ( -0.203136   0.213145 )
Epeak [keV] : 142.290      ( -42.4741 343.555 )
Norm@50keV  : 9.98325E-03    ( -0.00194654   0.00256162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.04 using 59 PHA bins.
# Reduced chi-squared =          1.126 for     56 degrees of freedom 
# Null hypothesis probability =   2.413758e-01
 
Photon flux (15-150 keV)    in 109.6 sec: 0.950201 ( -0.031175  0.031283 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.6565e-06 ( -2.5533e-07  2.543e-07 ) ergs/cm2

    1-s peak spectrum fit

    Power-law model
    Time interval is from   18.332 sec. to   19.332 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38251     ( -0.173647   0.173055 )
Norm@50keV  : 1.90590E-02    ( -0.00196035   0.00195085 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.58 using 59 PHA bins.
# Reduced chi-squared =         0.8875 for     57 degrees of freedom 
# Null hypothesis probability =   7.128979e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.31203 ( -0.23325  0.23339 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.84854e-07 ( -2.13757e-08  2.16412e-08 ) ergs/cm2
    Cutoff power-law model
    Time interval is from   18.332 sec. to   19.332 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.967915     ( -0.541339   0.77994 )
Epeak [keV] : 121.704      (   )
Norm@50keV  : 3.12301E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.48 using 59 PHA bins.
# Reduced chi-squared =         0.8836 for     56 degrees of freedom 
# Null hypothesis probability =   7.183434e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.27308 ( -0.24241  0.24176 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.78057e-07 ( -2.42238e-08  2.42123e-08 ) ergs/cm2

    Time-resolved spectra




    Distribution

    T90 vs. Hardness ratio plot 

    T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

    S(15-50 keV)  = N/A
S(50-150 keV) = N/A

    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 = 4.256915177736341E-01, IMY = 1.924508996885837E-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:
-60.464000 -37.532000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.3238 -62.8269    8.7  56.3  176.6  -0.5642  -1.5    9.7	GX 301-2                      
245.0051 -15.6525    3.0  31.5   86.0   0.4302   3.9    1.7	Sco X-1                       
162.5914 -42.6604    2.5  54.8 -153.7   1.0009   4.6 ------	UNKNOWN

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

    Time interval of the image:
-37.532000 28.836600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.7035 -62.8782    8.3  56.2  176.4   2.5221   1.4    6.6	GX 301-2                      
244.9212 -15.6520    3.5  31.4   86.0   1.7452   3.4    3.4	Sco X-1                       
210.3581  14.9009    0.3  25.0  -24.3  10.2427  41.1 ------	UNKNOWN                       
204.0304  44.0663    2.6  54.7  -25.9   3.4525   4.5 ------	UNKNOWN                       
164.7383 -22.4915    3.4  48.0 -129.1   3.3197   3.4 ------	UNKNOWN

    Post-slew image of 15-350 keV band 

    Time interval of the image:
78.436600 415.736600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2914  35.2842   61.7  44.2   50.7  -0.2957  -0.2    8.9	Her X-1                       
247.6020  51.3978    3.1  47.1   27.5   3.9870   3.7 ------	UNKNOWN                       
218.4324   8.0068    3.8  10.5  126.5   1.1308   3.1 ------	UNKNOWN                       
178.8836  11.4220    3.5  30.8  -96.2   1.8990   3.3 ------	UNKNOWN                       
171.7530 -14.2136    2.3  48.0 -129.1   9.3512   5.1 ------	UNKNOWN                       
168.9399   8.1133    6.5  41.1  -98.3   3.1200   1.8 ------	UNKNOWN