GRB181123B: 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: Mon Dec 17 15:30:11 EST 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger873186
======================================================================

  Trigger: 00873186      Segment: 000

  BAT Trigger Time: 564644005.056   [s; MET]
      Trigger Stop: 564644005.312   [s; MET]
               UTC: 2018-11-23T05:33:03.090320    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 184.347946931295   Dec: 14.5895052083792  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.8
     Image Trigger?:     NO
     Rate S/N Ratio:     33.1058907144937  [ if not an image trigger ]
     Image S/N Ratio:    8.8

  Analysis Position:   [ source = BAT ]
    RA: 184.347946931295   Dec: 14.5895052083792  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 184.354266789054   Dec: 14.6189249364019  [deg; J2000]  
        { 12h 17m 25.0s , +14d 37' 08.1" }
         +/- 1.8942515228223 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.844450065854187 [arcmin] (formal 1-sigma fit error)
    SNR: 12.211777619302
 
  Angular difference between the analysis and refined position is 1.802919 arcmin
 
  Partial Coding Fraction: 0.59375    [ including projection effects ]

  Duration
     T90: 0.259999990463257 +/- 0.0456070676079005
        Measured from: 0.0399999618530273
                   to: 0.299999952316284     [s; relative to TRIGTIME]
     T50: 0.123999953269958 +/- 0.0452548414138629
        Measured from: 0.0880000591278076
                   to: 0.212000012397766     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.325999975204468     
                   to: 0.674000024795532     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0320000648498535     
                   to: 0.312000036239624     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.024960   0.045320   0.065715   0.031287
           0.006353   0.007780   0.008032   0.006937 [error]
 Peak      0.030817   0.037276   0.076638   0.029402
           0.009966   0.011185   0.010680   0.009103 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.280    0.032    0.312
T90     0.260    0.040    0.300
T50     0.124    0.088    0.212
Peak    1.000   -0.326    0.674
 
 
====== 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: 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      -0.725    -0.261      0.282       -           -               -         3.75e-02     -5.85e-03          5.70e-03      69.840   57
CPL     -0.725    -0.256      0.292     9999.360    -9999.360      -9999.360      3.78e-02     -5.48e-03          4.40e-02      69.850   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      -0.627     -0.355     0.400       -           -               -         1.13e-02     -2.53e-03          2.38e-03      64.490   57
CPL     -0.526     -0.454     1.327      998.849    -998.849      -998.849      1.23e-02     -3.45e-03          -1.23e-02      64.590   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   6.52e-09  1.93e-08  4.68e-08  3.14e-07  1.27e-07  3.87e-07   erg/cm2
      90%_error_low -2.06e-09 -3.89e-09 -7.10e-09 -1.01e-07 -1.96e-08 -1.04e-07   erg/cm2
      90%_error_hi   2.30e-09  3.76e-09  7.01e-09  1.34e-07  1.97e-08  1.35e-07   erg/cm2
Peak flux       PL   2.03e-01  3.46e-01  4.48e-01  1.17e+00  1.32e+00  2.17e+00   ph/cm2/s
      90%_error_low -9.01e-02 -1.04e-01 -8.06e-02 -4.27e-01 -2.56e-01 -4.51e-01   ph/cm2/s
      90%_error_hi   1.12e-01  1.03e-01  8.04e-02  5.97e-01  2.59e-01  5.27e-01   ph/cm2/s
 
Fluence        CPL   6.51e-09  1.93e-08  4.64e-08  3.29e-07  1.27e-07  3.87e-07   erg/cm2
      90%_error_low    N/A       N/A    -7.03e-09 -3.29e-07 -2.69e-08 -1.98e-07   erg/cm2
      90%_error_hi     N/A       N/A     9.01e-09  6.96e-08  2.58e-08  5.97e-08   erg/cm2
Peak flux      CPL   2.07e-01  3.46e-01  4.46e-01  1.17e+00  1.32e+00  2.06e+00   ph/cm2/s
      90%_error_low -1.25e-01 -1.06e-01 -7.87e-02 -7.03e-01 -2.61e-01 -6.79e-01   ph/cm2/s
      90%_error_hi   1.12e-01  7.97e-02  9.87e-02  5.77e-01  2.53e-01  5.87e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  184.3543    14.6189   0.0157    27.6123    39.8172         0.1830854     12.212 TRIG_00873186                 
 
Foreground time interval of the image:
  0.032   0.312 (delta_t =   0.280 [sec])
Background time interval of the image:
-122.155   0.032 (delta_t = 122.187 [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    0.032 sec. to    0.312 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.725109     ( -0.261278   0.281845 )
Norm@50keV  : 3.74583E-02    ( -0.00584652   0.00570429 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.84 using 59 PHA bins.
# Reduced chi-squared =          1.225 for     57 degrees of freedom 
# Null hypothesis probability =   1.181940e-01
 
Photon flux (15-150 keV)    in 0.28 sec: 0.256607 ( -0.015751  0.247746 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26607e-07 ( -1.95937e-08  1.96841e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.032 sec. to    0.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.724557     ( -0.257696   0.290131 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 3.77610E-02    ( -0.00544956   0.0440086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.85 using 59 PHA bins.
# Reduced chi-squared =          1.247 for     56 degrees of freedom 
# Null hypothesis probability =   1.009463e-01
 
Photon flux (15-150 keV)    in 0.28 sec: 4.32078 ( -0.63818  0.63947 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.27212e-07 ( -2.69313e-08  2.58254e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.326 sec. to    0.674 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.626628     ( -0.354642   0.400055 )
Norm@50keV  : 1.13190E-02    ( -0.0025281   0.00237669 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.49 using 59 PHA bins.
# Reduced chi-squared =          1.131 for     57 degrees of freedom 
# Null hypothesis probability =   2.312798e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.31747 ( -0.25615  0.25868 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.42939e-07 ( -2.67754e-08  2.68267e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.326 sec. to    0.674 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.61708     ( -0.454269   1.32707 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 1.14069E-02    ( -0.00253912   -0.0114079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.50 using 59 PHA bins.
# Reduced chi-squared =          1.152 for     56 degrees of freedom 
# Null hypothesis probability =   2.038807e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.32008 ( -0.26079  0.25319 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.43113e-07 ( 0  0 ) 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 = 4.017588232730953E-01, IMY = -3.349367848319640E-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:
-122.155400 0.032000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5605  35.5261    0.0  39.8 -166.1   0.3348   1.4   12.1	Her X-1                       
185.6473  -5.3063    3.7  36.6    5.6   0.6810   3.1 ------	UNKNOWN                       
196.7091 -15.9454    2.8  39.1  -18.9   0.8797   4.1 ------	UNKNOWN                       
193.9321 -29.2157    2.3  52.3  -23.0   2.0046   5.0 ------	UNKNOWN                       
267.9288  16.2539    3.2  52.3 -139.6   3.1183   3.6 ------	UNKNOWN                       

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

Time interval of the image:
0.032000 0.312000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6417  35.2931    5.3  39.9 -165.7   0.0349   2.2    9.5	Her X-1                       
184.3543  14.6189    0.9  27.6   39.8   0.1831  12.2 ------	UNKNOWN                       
207.2522  -8.5413    3.0  28.8  -32.5   0.0410   3.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
64.044620 963.006000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
137.5021  -4.3417    4.4  50.1   39.7   8.1548   2.6 ------	UNKNOWN                       
154.5607  37.9249    2.7  35.2  105.5   6.9029   4.2 ------	UNKNOWN                       
168.1370  45.8088    3.2  34.1  128.0   4.8137   3.6 ------	UNKNOWN                       
221.2797  48.8135    3.0  45.7 -178.1   5.3089   3.9 ------	UNKNOWN                       
190.4405  12.9755    2.3   6.1 -107.2   3.1049   5.1 ------	UNKNOWN                       
236.8534  18.7033    3.4  50.3 -134.1  11.6306   3.4 ------	UNKNOWN