GRB141031B: Summary Image Light curves Spectra Distribution Others

Analysis Summary

Notes:

• 1) No attempt has been made to eliminate the non-significant decimal places.
• 2) This batgrbproduct analysis is done using the HEASARC data.
• 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Nov 19 23:12:45 EST 2014
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger617149
======================================================================

  Trigger: 00617149      Segment: 000

  BAT Trigger Time: 436460217.792   [s; MET]
      Trigger Stop: 436460225.984   [s; MET]
               UTC: 2014-10-31T14:56:45.065320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 356.931700786733   Dec: 41.3655291034627  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.44
     Image Trigger?:     NO
     Rate S/N Ratio:     8.94427190999916  [ if not an image trigger ]
     Image S/N Ratio:    7.44

  Analysis Position:   [ source = BAT ]
    RA: 356.931700786733   Dec: 41.3655291034627  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 356.891516695287   Dec: 41.3582801156985  [deg; J2000]  
        { 23h 47m 34.0s , +41d 21' 29.8" }
         +/- 2.15986910609419 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.873928674413082 [arcmin] (formal 1-sigma fit error)
    SNR: 10.1242976546688
 
  Angular difference between the analysis and refined position is 1.861147 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 15.62399995327 +/- 2.55484640013608
        Measured from: 1.72799998521805
                   to: 17.351999938488     [s; relative to TRIGTIME]
     T50: 8.37199991941452 +/- 3.7976545693757
        Measured from: 4.42400002479553
                   to: 12.7959999442101     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.40399998426437     
                   to: 5.40399998426437     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 1.04799997806549     
                   to: 18.3080000281334     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.117310   0.116474   0.110686   0.062054
           0.022692   0.023400   0.020423   0.017619 [error]
 Peak      0.018211   0.011313   0.010304   0.015199
           0.005416   0.005741   0.005023   0.004177 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   17.260    1.048   18.308
T90    15.624    1.728   17.352
T50     8.372    4.424   12.796
Peak    1.000    4.404    5.404
 
 
====== 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      -1.367    -0.351      0.355       -           -               -         1.48e-03     -2.57e-04          2.53e-04      54.420   57
CPL     -1.369    -2.327     -0.944     9999.360      N/A           N/A         1.48e-03        N/A               N/A         54.440   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.219     -0.816     0.937       -           -               -         3.02e-03     -1.04e-03          1.03e-03      56.500   57
CPL     -1.292     -0.752     1.028     9999.340    -9999.340      -9999.340      2.96e-03        N/A               N/A         56.550   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   2.88e-08  5.74e-08  8.89e-08  3.03e-07  2.48e-07  4.78e-07   erg/cm2
      90%_error_low -9.18e-09 -1.08e-08 -2.13e-08 -1.37e-07 -4.97e-08 -1.54e-07   erg/cm2
      90%_error_hi   9.85e-09  1.04e-08  2.06e-08  2.05e-07  5.05e-08  2.13e-07   erg/cm2
Peak flux       PL   9.47e-02  1.13e-01  9.72e-02  1.43e-01  3.55e-01  4.47e-01   ph/cm2/s
      90%_error_low -9.47e-02 -5.68e-02 -4.60e-02 -1.06e-01 -1.25e-01 -1.62e-01   ph/cm2/s
      90%_error_hi   8.18e-02  4.62e-02  4.02e-02  2.45e-01  1.27e-01  1.87e-01   ph/cm2/s
 
Fluence        CPL    N/A     1.98e-08  8.88e-08  3.00e-07  1.19e-07  4.62e-07   erg/cm2
      90%_error_low -9.18e-09 -1.79e-08    N/A       N/A    -5.58e-08 -1.57e-07   erg/cm2
      90%_error_hi   9.85e-09  1.67e-08    N/A       N/A     4.27e-08  4.76e-07   erg/cm2
Peak flux      CPL     N/A      N/A      N/A      N/A      N/A      N/A     ph/cm2/s
      90%_error_low -9.47e-02 -5.68e-02 -4.60e-02 -1.06e-01 -1.25e-01 -1.62e-01   ph/cm2/s
      90%_error_hi   8.18e-02  4.62e-02  4.02e-02  2.45e-01  1.27e-01  1.87e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  356.8915    41.3583   0.0190    12.0879    -7.7959         0.4200339     10.124 TRIG_00617149                 
 
Foreground time interval of the image:
  1.048  18.308 (delta_t =  17.260 [sec])
Background time interval of the image:
-491.491 -415.052 (delta_t =  76.439 [sec])
-239.792   1.048 (delta_t = 240.840 [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

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

Spectra

Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from    1.048 sec. to   18.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36749     ( -0.351314   0.355083 )
Norm@50keV  : 1.47872E-03    ( -0.000256655   0.000253033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.42 using 59 PHA bins.
# Reduced chi-squared =         0.9547 for     57 degrees of freedom 
# Null hypothesis probability =   5.725350e-01
 
Photon flux (15-150 keV)    in 17.26 sec: 0.178798 ( -0.030714  0.030739 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.48354e-07 ( -4.96803e-08  5.0501e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.048 sec. to   18.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.32283     ( -0.369838   1.01295 )
Epeak [keV] : 351.200      (   )
Norm@50keV  : 1.76543E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.97 using 59 PHA bins.
# Reduced chi-squared =         0.8923 for     56 degrees of freedom 
# Null hypothesis probability =   7.013114e-01
 
Photon flux (15-150 keV)    in 17.26 sec: 0.178839 ( -0.030791  0.030671 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.19001e-07 ( -5.57931e-08  4.26845e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    4.404 sec. to    5.404 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21886     ( -0.817673   0.935444 )
Norm@50keV  : 3.01935E-03    ( -0.00103532   0.00103492 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.50 using 59 PHA bins.
# Reduced chi-squared =         0.9913 for     57 degrees of freedom 
# Null hypothesis probability =   4.936078e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.355244 ( -0.125355  0.127082 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.05e-08 ( -1.23853e-08  1.24685e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.404 sec. to    5.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22539     ( -0.75578   1.02432 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 3.02965E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.52 using 59 PHA bins.
# Reduced chi-squared =          1.009 for     56 degrees of freedom 
# Null hypothesis probability =   4.554814e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.03865e-08 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 15.624 sec.
Hardness ratio (energy fluence ratio) = 1.55042235215

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

S(15-50 keV)  = 8.61508e-08
S(50-150 keV) = 1.6220515e-07

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 = 2.121818550241311E-01, IMY = 2.904985843977051E-02

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:
-491.491400 -415.052000
-239.792000 1.048000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1426  40.8737    9.2  42.5  -60.5   1.0842   1.3    5.0	Cyg X-3                       
325.9503  38.3989    0.0  28.7  -63.2  -0.2958  -0.9   11.4	Cyg X-2                       
 51.1284  45.0485    3.5  43.5   53.8   3.3815   3.3 ------	UNKNOWN                       
 26.7990 -10.3051    3.2  47.9  141.5   3.9555   3.5 ------	UNKNOWN                       
  1.5244 -15.6173    2.5  45.1  176.2   2.1274   4.6 ------	UNKNOWN                       
347.8789   2.3109    2.2  29.1 -157.0   1.3710   5.1 ------	UNKNOWN                       
323.5520  -4.3268    3.3  47.9 -129.1   4.0229   3.5 ------	UNKNOWN                       
299.0188  49.1776    2.5  49.0  -48.9   5.3024   4.5 ------	UNKNOWN                       

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

Time interval of the image:
1.048000 18.308000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.3112  40.9180    6.2  42.4  -60.4   0.2791   1.9    9.3	Cyg X-3                       
325.9780  38.4075    5.5  28.7  -63.2   0.1280   2.1   10.5	Cyg X-2                       
356.8915  41.3583    1.1  12.1   -7.8   0.4201  10.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
99.308600 841.908610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0040  40.9257    7.7  36.4 -101.2   1.9671   1.5    5.1	Cyg X-3                       
326.3501  38.2322    6.8  23.6 -114.7   0.9064   1.7   10.0	Cyg X-2                       
 11.5817  24.6701    2.3  20.7  112.2   2.4159   4.9 ------	UNKNOWN                       
322.2828  -8.3123    3.0  59.0 -166.2  11.5573   3.8 ------	UNKNOWN