GRB171123A

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: Sat Jan 20 04:51:35 EST 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger791922
======================================================================

  Trigger: 00791922      Segment: 000

  BAT Trigger Time: 533139307.648   [s; MET]
      Trigger Stop: 533139309.696   [s; MET]
               UTC: 2017-11-23T14:14:47.601920    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 186.190266485784   Dec: 32.5309103636178  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.65
     Image Trigger?:     NO
     Rate S/N Ratio:     10.5830052442584  [ if not an image trigger ]
     Image S/N Ratio:    7.65

  Analysis Position:   [ source = BAT ]
    RA: 186.190266485784   Dec: 32.5309103636178  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 186.195621801091   Dec: 32.5040588616572  [deg; J2000]  
        { 12h 24m 46.9s , +32d 30' 14.6" }
         +/- 2.3869310097168 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.39645185914269 [arcmin] (formal 1-sigma fit error)
    SNR: 8.77702109081171
 
  Angular difference between the analysis and refined position is 1.633714 arcmin
 
  Partial Coding Fraction: 0.8671875    [ including projection effects ]

  Duration
     T90: 58.4640000462532 +/- 27.0532475891225
        Measured from: -0.480000019073486
                   to: 57.9840000271797     [s; relative to TRIGTIME]
     T50: 17.8400000333786 +/- 33.1759653307577
        Measured from: 1.34399998188019
                   to: 19.1840000152588     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.26800000667572     
                   to: 0.73199999332428     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.39200001955032     
                   to: 60.2879999876022     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.166554   0.319132   0.215920   0.045502
           0.047618   0.048999   0.042061   0.035964 [error]
 Peak      0.030078   0.033122   0.027940   0.008987
           0.006349   0.006899   0.005959   0.004801 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   61.680   -1.392   60.288
T90    58.464   -0.480   57.984
T50    17.840    1.344   19.184
Peak    1.000   -0.268    0.732
 
 
====== 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      -1.370    -0.336      0.341       -           -               -         7.93e-04     -1.51e-04          1.50e-04      46.670   57
CPL     -1.337    -2.254      1.198      936.309    -936.309      -936.309      8.25e-04     -1.81e-04          -8.25e-04      46.690   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      -1.661     -0.410     0.379       -           -               -         6.19e-03     -1.45e-03          1.36e-03      55.460   57
CPL     -1.654     -1.486     0.293     9999.340      N/A           N/A         6.21e-03        N/A               N/A         55.470   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   5.53e-08  1.10e-07  1.70e-07  5.78e-07  4.76e-07  9.14e-07   erg/cm2
      90%_error_low -1.78e-08 -2.25e-08 -4.17e-08 -2.56e-07 -1.01e-07 -2.95e-07   erg/cm2
      90%_error_hi   1.92e-08  2.20e-08  4.11e-08  3.74e-07  1.03e-07  3.93e-07   erg/cm2
Peak flux       PL   2.98e-01  2.72e-01  1.72e-01  1.67e-01  8.11e-01  9.09e-01   ph/cm2/s
      90%_error_low -9.39e-02 -5.47e-02 -5.29e-02 -8.45e-02 -1.60e-01 -1.84e-01   ph/cm2/s
      90%_error_hi   1.00e-01  5.42e-02  5.14e-02  1.24e-01  1.60e-01  1.87e-01   ph/cm2/s
 
Fluence        CPL   5.56e-08  1.09e-07  1.69e-07  5.75e-07  4.79e-07  9.17e-07   erg/cm2
      90%_error_low    N/A    -2.25e-08 -4.39e-08    N/A    -1.19e-07 -4.93e-07   erg/cm2
      90%_error_hi     N/A     2.72e-08  4.78e-08    N/A     1.09e-07  1.80e-07   erg/cm2
Peak flux      CPL   3.04e-01  2.72e-01  1.72e-01  1.66e-01  8.12e-01  9.17e-01   ph/cm2/s
      90%_error_low -1.02e-01     N/A       N/A       N/A   -1.60e-01 -1.95e-01   ph/cm2/s
      90%_error_hi   9.56e-02     N/A       N/A       N/A    1.60e-01  1.81e-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
  186.1956    32.5041   0.0219    22.1925  -142.9479         0.5974585      8.777 TRIG_00791922                 
 
Foreground time interval of the image:
 -1.392  29.853 (delta_t =  31.245 [sec])
Background time interval of the image:
-239.648  -1.392 (delta_t = 238.256 [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:

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   -1.392 sec. to   60.288 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37018     ( -0.336467   0.341157 )
Norm@50keV  : 7.93244E-04    ( -0.000151231   0.000150262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.67 using 59 PHA bins.
# Reduced chi-squared =         0.8188 for     57 degrees of freedom 
# Null hypothesis probability =   8.338743e-01
 
Photon flux (15-150 keV)    in 61.68 sec: 9.59704E-02 ( -0.0183218  0.0183666 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.758e-07 ( -1.00841e-07  1.02608e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.392 sec. to   60.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36709     ( -2.25384   1.1979 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 7.96223E-04    ( -0.000152188   -0.000796237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.67 using 59 PHA bins.
# Reduced chi-squared =         0.8334 for     56 degrees of freedom 
# Null hypothesis probability =   8.083616e-01
 
Photon flux (15-150 keV)    in 61.68 sec: 9.62769E-02 ( -0.0194978  0.0186551 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.79164e-07 ( -1.18831e-07  1.09048e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.268 sec. to    0.732 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66139     ( -0.410463   0.379502 )
Norm@50keV  : 6.19099E-03    ( -0.0014466   0.00136125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.46 using 59 PHA bins.
# Reduced chi-squared =         0.9731 for     57 degrees of freedom 
# Null hypothesis probability =   5.328589e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.811483 ( -0.160399  0.160438 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.75215e-08 ( -1.38739e-08  1.41786e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.268 sec. to    0.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.90508     ( -0.236041   1.54296 )
Epeak [keV] : 272.887      (   )
Norm@50keV  : 1.57224E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.70 using 59 PHA bins.
# Reduced chi-squared =         0.9589 for     56 degrees of freedom 
# Null hypothesis probability =   5.624730e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.811505 ( -0.159797  0.16036 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.89969e-08 ( 0  0 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 58.464 sec.
Hardness ratio (energy fluence ratio) = 1.54739014858

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

S(15-50 keV)  = 1.653955e-07
S(50-150 keV) = 3.104028e-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 = -3.255722515098822E-01, IMY = 2.458006249442089E-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:
-239.648000 -1.392000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
156.5257  75.9608    2.4  53.6  156.6   5.3277   4.8 ------	UNKNOWN                       
144.9724   8.6225    2.7  22.8   34.3   0.9113   4.2 ------	UNKNOWN                       
151.8129 -23.6272    3.1  47.5   -6.3   1.4010   3.7 ------	UNKNOWN

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

Time interval of the image:
-1.392000 29.852600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.1958  32.5040    1.3  22.2 -142.9   0.5976   8.8 ------	UNKNOWN                       
214.5790  24.4665    2.1  46.4 -124.2   1.4931   5.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
74.052630 962.487700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3152  35.1906    9.7  55.5 -151.3  -4.6559  -1.2   11.5	Her X-1                       
209.3152  21.8208    2.7  23.1 -106.5   2.9985   4.2 ------	UNKNOWN                       
167.7206 -21.3994    3.0  56.7  -17.6  10.1136   3.8 ------	UNKNOWN                       
234.0441  17.8621    3.7  45.3 -121.4   8.8702   3.1 ------	UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

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

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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