GRB180111A: 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: Fri Feb  2 16:01:01 EST 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger804692
======================================================================

  Trigger: 00804692      Segment: 000

  BAT Trigger Time: 537381746.688   [s; MET]
      Trigger Stop: 537381746.944   [s; MET]
               UTC: 2018-01-11T16:42:06.387380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 149.84082869691   Dec: 48.2647072728262  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.93
     Image Trigger?:     NO
     Rate S/N Ratio:     76.3020314277412  [ if not an image trigger ]
     Image S/N Ratio:    10.93

  Analysis Position:   [ source = BAT ]
    RA: 149.84082869691   Dec: 48.2647072728262  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 149.781875138668   Dec: 48.254015645398  [deg; J2000]  
        { 09h 59m 07.7s , +48d 15' 14.5" }
         +/- 0.666105442273207 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.218121391426041 [arcmin] (formal 1-sigma fit error)
    SNR: 54.3500357760269
 
  Angular difference between the analysis and refined position is 2.440745 arcmin
 
  Partial Coding Fraction: 0.703125    [ including projection effects ]

  Duration
     T90: 50.8919999599457 +/- 1.88013615903655
        Measured from: 1.78400003910065
                   to: 52.6759999990463     [s; relative to TRIGTIME]
     T50: 22.2639999389648 +/- 0.394400764322609
        Measured from: 10.392000079155
                   to: 32.6560000181198     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 13.8880000114441     
                   to: 14.8880000114441     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.296000003814697     
                   to: 69.5880000591278     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.446196   5.306081   4.627286   1.520888
           0.057406   0.063303   0.059197   0.048992 [error]
 Peak      0.117844   0.200227   0.221808   0.089550
           0.008909   0.010716   0.010790   0.008664 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   69.884   -0.296   69.588
T90    50.892    1.784   52.676
T50    22.264   10.392   32.656
Peak    1.000   13.888   14.888
 
 
====== 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      -1.280    -0.034      0.034       -           -               -         1.45e-02     -2.54e-04          2.54e-04      36.880   57
CPL     -1.275    -0.034      0.034     9987.990    -9987.990      -9987.990      1.45e-02     -2.51e-04          9.56e-04      37.010   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      -0.971     -0.095     0.096       -           -               -         4.25e-02     -2.28e-03          2.27e-03      52.910   57
CPL     -0.958     -0.103     0.353     9967.010    -9967.010      -9967.010      4.28e-02     -2.23e-03          2.28e-03      52.930   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   1.05e-06  2.21e-06  3.64e-06  1.36e-05  1.00e-05  2.05e-05   erg/cm2
      90%_error_low -4.14e-08 -5.03e-08 -6.85e-08 -6.18e-07 -1.75e-07 -6.36e-07   erg/cm2
      90%_error_hi   4.21e-08  5.03e-08  6.84e-08  6.39e-07  1.75e-07  6.53e-07   erg/cm2
Peak flux       PL   4.00e-04  4.86e-03  6.37e-02  5.60e+00  2.39e-01  5.56e+00   ph/cm2/s
      90%_error_low 3.81e-05     N/A   -2.47e-03 -2.63e-01     N/A   -1.59e-01   ph/cm2/s
      90%_error_hi   1.14e-04     N/A    7.32e-03  4.23e-01     N/A    5.30e-01   ph/cm2/s
 
Fluence        CPL   1.05e-06  2.21e-06  3.62e-06  1.45e-05  1.01e-05  2.04e-05   erg/cm2
      90%_error_low    N/A    -4.68e-08    N/A       N/A    -2.18e-07 -1.15e-06   erg/cm2
      90%_error_hi     N/A     5.38e-08    N/A       N/A     1.31e-07  6.15e-07   erg/cm2
Peak flux      CPL   1.05e+00  1.46e+00  1.49e+00  2.74e+00  4.89e+00  6.73e+00   ph/cm2/s
      90%_error_low -1.52e-01 -9.52e-02 -8.79e-02 -8.89e-01 -2.62e-01 -9.21e-01   ph/cm2/s
      90%_error_hi   9.34e-02  1.03e-01  1.08e-01  2.23e-01  2.67e-01  4.07e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  149.7819    48.2540   0.0035    28.0848    28.4416         3.6437797     54.350 TRIG_00804692                 
 
Foreground time interval of the image:
 -0.296   9.813 (delta_t =  10.109 [sec])
Background time interval of the image:
-239.688  -0.296 (delta_t = 239.392 [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   -0.296 sec. to   69.588 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27965     ( -0.0336512   0.0337548 )
Norm@50keV  : 1.44691E-02    ( -0.00025406   0.000253578 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.88 using 59 PHA bins.
# Reduced chi-squared =         0.6470 for     57 degrees of freedom 
# Null hypothesis probability =   9.822591e-01
 
Photon flux (15-150 keV)    in 69.88 sec: 1.71991 ( -0.03415  0.03432 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00432e-05 ( -1.74911e-07  1.74941e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.296 sec. to   69.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2751     ( -0.0340643   0.0338303 )
Epeak [keV] : 9987.99      ( -9995.61 -9995.61 )
Norm@50keV  : 1.45301E-02    ( -0.000250643   0.000956574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.01 using 59 PHA bins.
# Reduced chi-squared =         0.6609 for     56 degrees of freedom 
# Null hypothesis probability =   9.764362e-01
 
Photon flux (15-150 keV)    in 69.88 sec: 1.73146 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00842e-05 ( -2.18202e-07  1.31334e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   13.888 sec. to   14.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.971151     ( -0.0950125   0.0961522 )
Norm@50keV  : 4.25208E-02    ( -0.00227539   0.00226857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.91 using 59 PHA bins.
# Reduced chi-squared =         0.9283 for     57 degrees of freedom 
# Null hypothesis probability =   6.291242e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.239311 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.64644e-07 ( -2.7132e-08  2.72256e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   13.888 sec. to   14.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.965115     ( -0.103265   0.353217 )
Epeak [keV] : 9999.99      ( -9999.99 -9999.99 )
Norm@50keV  : 4.27842E-02    ( -0.00225586   0.00225075 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.91 using 59 PHA bins.
# Reduced chi-squared =         0.9448 for     56 degrees of freedom 
# Null hypothesis probability =   5.925905e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.88549 ( -0.26191  0.26671 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.64344e-07 ( -2.82501e-08  2.61232e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 50.892 sec.
Hardness ratio (energy fluence ratio) = 1.64763102054

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

S(15-50 keV)  = 3.260338e-06
S(50-150 keV) = 6.782827e-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 = 4.692045612666956E-01, IMY = -2.541387528466470E-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:
-239.688000 -0.296000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6325  22.0232    0.8  43.4  138.7   9.7367  14.6    0.5	Crab                          
 46.7468  34.1802    3.7  46.0 -171.5   1.2083   3.2 ------	UNKNOWN                       
 40.9211  61.4410    0.3  29.1 -134.6   9.7414  34.2 ------	UNKNOWN                       
 11.2898  51.0808    3.2  48.0 -129.2   3.7924   3.5 ------	UNKNOWN                       

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

Time interval of the image:
-0.296000 9.812590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6775  21.9360    7.6  43.4  138.6   0.2594   1.5    5.3	Crab                          
149.7819  48.2540    0.2  28.1   28.4   3.6436  54.3 ------	UNKNOWN                       
267.3805  72.9584    4.3  43.8  -64.1   0.6529   2.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
76.012640 683.812610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
118.3168  27.2515    2.7  32.2   90.1   3.1116   4.2 ------	UNKNOWN                       
 40.8918  61.4499    1.5  56.5  176.5  19.7355   7.9 ------	UNKNOWN                       
 37.1891  62.7431    2.6  56.9  179.0  11.8131   4.4 ------	UNKNOWN                       
189.5512   3.1593    3.4  56.5  -20.6   6.0102   3.5 ------	UNKNOWN                       
351.3643  74.5342    3.4  56.4 -157.4   8.6843   3.4 ------	UNKNOWN                       
286.6289  84.1036    3.5  46.2 -145.1   3.2329   3.3 ------	UNKNOWN                       
340.7551  74.3604    4.1  57.2 -154.2   8.5080   2.8 ------	UNKNOWN                       
339.5406  74.5500    2.7  57.0 -153.7  13.1132   4.3 ------	UNKNOWN