GRB180706A: 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 Aug  6 18:35:29 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger846395
======================================================================

  Trigger: 00846395      Segment: 000

  BAT Trigger Time: 552558301.632   [s; MET]
      Trigger Stop: 552558303.68   [s; MET]
               UTC: 2018-07-06T08:24:40.412760    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 181.665199303239   Dec: 66.0347153838887  [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:     14.3527000944073  [ if not an image trigger ]
     Image S/N Ratio:    8.89

  Analysis Position:   [ source = BAT ]
    RA: 181.665199303239   Dec: 66.0347153838887  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 181.682590515597   Dec: 66.0447592756642  [deg; J2000]  
        { 12h 06m 43.8s , +66d 02' 41.1" }
         +/- 1.01694053934579 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.282537722573893 [arcmin] (formal 1-sigma fit error)
    SNR: 29.6958766673408
 
  Angular difference between the analysis and refined position is 0.736707 arcmin
 
  Partial Coding Fraction: 0.8671875    [ including projection effects ]

  Duration
     T90: 42.444000005722 +/- 7.16259732479527
        Measured from: -2.11199998855591
                   to: 40.3320000171661     [s; relative to TRIGTIME]
     T50: 20.7359999418259 +/- 10.505770698851
        Measured from: 9.58800005912781
                   to: 30.3240000009537     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 27.8240000009537     
                   to: 28.8240000009537     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.9199999570847     
                   to: 51.1679999828339     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.562277   1.721259   0.919751   0.170411
           0.052522   0.053928   0.045661   0.038157 [error]
 Peak      0.119661   0.149393   0.097384   0.014588
           0.007958   0.008518   0.007624   0.005079 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   67.088  -15.920   51.168
T90    42.444   -2.112   40.332
T50    20.736    9.588   30.324
Peak    1.000   27.824   28.824
 
 
====== 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      -1.909    -0.080      0.079       -           -               -         3.87e-03     -1.74e-04          1.73e-04      57.690   57
CPL     -1.519    -0.317      0.344       57.022     -10.580        46.123      6.21e-03     -1.95e-03          3.16e-03      53.210   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -1.703     -0.117     0.114       -           -               -         2.37e-02     -1.73e-03          1.72e-03      54.160   57
CPL     -0.995     -0.481     0.542       67.048     -12.535        43.133      5.61e-02     -2.45e-02          5.14e-02      47.520   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   4.87e-07  6.98e-07  7.43e-07  1.47e-06  2.39e-06  3.40e-06   erg/cm2
      90%_error_low -3.29e-08 -2.85e-08 -4.61e-08 -1.84e-07 -1.05e-07 -2.25e-07   erg/cm2
      90%_error_hi   3.36e-08  2.85e-08  4.63e-08  2.02e-07  1.06e-07  2.38e-07   erg/cm2
Peak flux       PL   1.18e+00  1.06e+00  6.49e-01  6.05e-01  3.14e+00  3.49e+00   ph/cm2/s
      90%_error_low -1.22e-01 -7.17e-02 -6.11e-02 -1.05e-01 -2.12e-01 -2.35e-01   ph/cm2/s
      90%_error_hi   1.26e-01  7.15e-02  6.09e-02  1.17e-01  2.12e-01  2.35e-01   ph/cm2/s
 
Fluence        CPL   4.59e-07  7.23e-07  7.44e-07  7.97e-07  2.30e-06  2.72e-06   erg/cm2
      90%_error_low -3.97e-08 -3.48e-08 -4.90e-08 -2.91e-07 -1.27e-07 -3.23e-07   erg/cm2
      90%_error_hi   4.02e-08  3.53e-08  4.89e-08  4.99e-07  1.28e-07  5.13e-07   erg/cm2
Peak flux      CPL   1.06e+00  1.14e+00  6.76e-01  2.80e-01  3.06e+00  3.16e+00   ph/cm2/s
      90%_error_low -1.46e-01 -8.98e-02 -6.86e-02 -1.13e-01 -2.20e-01 -2.53e-01   ph/cm2/s
      90%_error_hi   1.48e-01  9.18e-02  6.93e-02  1.87e-01  2.19e-01  2.78e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  181.6826    66.0448   0.0065    20.9124   153.2869         2.4240792     29.696 TRIG_00846395                 
 
Foreground time interval of the image:
-15.920  27.269 (delta_t =  43.189 [sec])
Background time interval of the image:
-574.931 -556.881 (delta_t =  18.050 [sec])
-239.632 -15.920 (delta_t = 223.712 [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  -15.920 sec. to   51.168 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.90941     ( -0.0796954   0.0787018 )
Norm@50keV  : 3.86718E-03    ( -0.000173676   0.000172558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.69 using 59 PHA bins.
# Reduced chi-squared =          1.012 for     57 degrees of freedom 
# Null hypothesis probability =   4.496416e-01
 
Photon flux (15-150 keV)    in 67.09 sec: 0.557246 ( -0.023687  0.023749 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.38593e-06 ( -1.05441e-07  1.06013e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -15.920 sec. to   51.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51932     ( -0.317317   0.343696 )
Epeak [keV] : 57.0218      ( -10.5804 46.1234 )
Norm@50keV  : 6.21238E-03    ( -0.00194523   0.00315625 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.21 using 59 PHA bins.
# Reduced chi-squared =         0.9502 for     56 degrees of freedom 
# Null hypothesis probability =   5.811268e-01
 
Photon flux (15-150 keV)    in 67.09 sec: 0.542837 ( -0.026253  0.026297 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.29534e-06 ( -1.26801e-07  1.27513e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   27.824 sec. to   28.824 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70298     ( -0.116808   0.114163 )
Norm@50keV  : 2.36545E-02    ( -0.00173064   0.00171535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.16 using 59 PHA bins.
# Reduced chi-squared =         0.9501 for     57 degrees of freedom 
# Null hypothesis probability =   5.824869e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.14499 ( -0.21153  0.21164 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18993e-07 ( -1.67516e-08  1.69027e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   27.824 sec. to   28.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.994779     ( -0.481162   0.541976 )
Epeak [keV] : 67.0482      ( -12.5355 43.1325 )
Norm@50keV  : 5.61007E-02    ( -0.0244647   0.051373 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.52 using 59 PHA bins.
# Reduced chi-squared =         0.8485 for     56 degrees of freedom 
# Null hypothesis probability =   7.829541e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.06011 ( -0.21957  0.21918 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07778e-07 ( -1.83605e-08  1.853e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 42.444 sec.
Hardness ratio (energy fluence ratio) = 1.06485333865

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

S(15-50 keV)  = 1.1854423e-06
S(50-150 keV) = 1.2005105e-06

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 = -3.413283865794583E-01, IMY = -1.717678515573294E-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:
-574.931410 -556.881200
-239.632000 -15.920000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 41.7063  67.0069    2.3  27.0   19.3   1.0474   4.9 ------	UNKNOWN                       
 64.4481  76.8308    2.2  16.1   33.0   0.9419   5.2 ------	UNKNOWN                       
188.7841  52.6484    2.6  33.5  166.2   1.2644   4.3 ------	UNKNOWN                       
 40.8905  61.4671    1.3  31.4   12.5   2.2635   8.9 ------	UNKNOWN                       
 52.0073  53.6537    2.6  34.5   -4.7   1.1199   4.4 ------	UNKNOWN                       

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

Time interval of the image:
-15.920000 27.268610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
325.1661  81.0776    2.2  27.0   70.3   0.5927   5.2 ------	UNKNOWN                       
221.7312  70.0633    2.3  28.9  121.9   0.6103   5.0 ------	UNKNOWN                       
181.6826  66.0448    0.4  20.9  153.3   2.4240  29.7 ------	UNKNOWN                       
 30.7365  37.3354    2.0  55.7    3.5   2.0487   5.7 ------	UNKNOWN                       
 85.3733  69.6200    2.4  12.5   -2.5   0.3878   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
76.068600 718.765300
720.368000 840.348000
840.368000 962.441600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
212.6119  56.6953    3.2  17.3  110.9   2.0740   3.7 ------	UNKNOWN                       
351.3062  63.8051    3.8  49.9    9.0   3.9460   3.1 ------	UNKNOWN                       
 40.9180  61.4355    1.7  49.3  -20.5   7.1343   6.9 ------	UNKNOWN