GRB160223A: 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: Thu Mar 17 18:14:36 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger675361
======================================================================

  Trigger: 00675361      Segment: 000

  BAT Trigger Time: 477884681.152   [s; MET]
      Trigger Stop: 477884685.248   [s; MET]
               UTC: 2016-02-23T01:44:25.270300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 147.583623924545   Dec: 9.37258061929805  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.52
     Image Trigger?:     NO
     Rate S/N Ratio:     10.0498756211209  [ if not an image trigger ]
     Image S/N Ratio:    7.52

  Analysis Position:   [ source = BAT ]
    RA: 147.583623924545   Dec: 9.37258061929805  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 147.605648785973   Dec: 9.36774140759629  [deg; J2000]  
        { 09h 50m 25.4s , +09d 22' 03.9" }
         +/- 1.0054662170295 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.360341810262211 [arcmin] (formal 1-sigma fit error)
    SNR: 30.1811831744101
 
  Angular difference between the analysis and refined position is 1.335797 arcmin
 
  Partial Coding Fraction: 0.5390625    [ including projection effects ]

  Duration
     T90: 134.863999962807 +/- 17.4523558703056
        Measured from: 0.0600000023841858
                   to: 134.923999965191     [s; relative to TRIGTIME]
     T50: 21.12399995327 +/- 5.59414832688933
        Measured from: 89.3359999656677
                   to: 110.459999918938     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 109.948000013828     
                   to: 110.948000013828     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6     
                   to: 182.039999961853     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.896406   2.967764   2.510335   0.508971
           0.103045   0.107863   0.093981   0.080939 [error]
 Peak      0.081726   0.142822   0.137805   0.037414
           0.009059   0.010467   0.010224   0.007555 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  188.040   -6.000  182.040
T90   134.864    0.060  134.924
T50    21.124   89.336  110.460
Peak    1.000  109.948  110.948
 
 
====== 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      -1.354    -0.073      0.073       -           -               -         2.86e-03     -1.15e-04          1.15e-04      57.560   57
CPL     -0.958    -0.288      0.309      139.844     -39.167       207.937      4.41e-03     -1.17e-03          1.71e-03      51.910   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      -1.171     -0.132     0.133       -           -               -         2.66e-02     -2.07e-03          2.07e-03      54.360   57
CPL     -0.860     -0.374     0.562      195.401    -195.401      -195.401      3.77e-02     -1.25e-02          3.14e-02      53.270   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   5.99e-07  1.20e-06  1.88e-06  6.50e-06  5.25e-06  1.02e-05   erg/cm2
      90%_error_low -4.60e-08 -5.53e-08 -9.31e-08 -6.94e-07 -2.31e-07 -7.55e-07   erg/cm2
      90%_error_hi   4.72e-08  5.50e-08  9.29e-08  7.51e-07  2.31e-07  8.02e-07   erg/cm2
Peak flux       PL   8.00e-01  9.80e-01  8.70e-01  1.33e+00  3.11e+00  3.98e+00   ph/cm2/s
      90%_error_low -1.13e-01 -8.74e-02 -8.01e-02 -2.40e-01 -2.45e-01 -3.35e-01   ph/cm2/s
      90%_error_hi   1.18e-01  8.65e-02  7.94e-02  2.71e-01  2.45e-01  3.41e-01   ph/cm2/s
 
Fluence        CPL   5.51e-07  1.24e-06  1.94e-06  3.77e-06  5.10e-06  7.50e-06   erg/cm2
      90%_error_low -5.66e-08 -6.25e-08 -1.04e-07 -1.15e-06 -2.56e-07 -1.16e-06   erg/cm2
      90%_error_hi   5.77e-08  6.33e-08  1.05e-07  1.78e-06  2.55e-07  1.77e-06   erg/cm2
Peak flux      CPL   7.52e-01  1.01e+00  9.01e-01  9.43e-01  3.08e+00  3.60e+00   ph/cm2/s
      90%_error_low -1.37e-01 -9.84e-02 -9.36e-02 -3.93e-01 -2.51e-01 -4.71e-01   ph/cm2/s
      90%_error_hi   1.40e-01  1.01e-01  9.57e-02  4.60e-01  2.51e-01  5.70e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  147.6056     9.3677   0.0064    23.5169   108.6988         8.2639196     30.181 TRIG_00675361                 
 
Foreground time interval of the image:
 -6.000 182.040 (delta_t = 188.040 [sec])
Background time interval of the image:
-271.051 -251.860 (delta_t =  19.192 [sec])
-239.152  -6.000 (delta_t = 233.152 [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   -6.000 sec. to  182.040 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.35449     ( -0.072692   0.0729432 )
Norm@50keV  : 2.85939E-03    ( -0.000115399   0.000115391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.56 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.542259e-01
 
Photon flux (15-150 keV)    in 188 sec: 0.344798 ( -0.014661  0.014689 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.24563e-06 ( -2.30552e-07  2.31306e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -6.000 sec. to  182.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.957906     ( -0.2884   0.309207 )
Epeak [keV] : 139.844      ( -39.1668 207.937 )
Norm@50keV  : 4.41148E-03    ( -0.00116567   0.00171362 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.91 using 59 PHA bins.
# Reduced chi-squared =         0.9269 for     56 degrees of freedom 
# Null hypothesis probability =   6.304206e-01
 
Photon flux (15-150 keV)    in 188 sec: 0.337159 ( -0.015625  0.015636 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.0988e-06 ( -2.55766e-07  2.54943e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  109.948 sec. to  110.948 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17113     ( -0.131866   0.132572 )
Norm@50keV  : 2.66357E-02    ( -0.00207207   0.00207127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.36 using 59 PHA bins.
# Reduced chi-squared =         0.9537 for     57 degrees of freedom 
# Null hypothesis probability =   5.746667e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.11439 ( -0.24521  0.24534 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.72515e-07 ( -2.40187e-08  2.41935e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  109.948 sec. to  110.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.860491     ( -0.374452   0.561646 )
Epeak [keV] : 195.401      ( -195.403 -195.403 )
Norm@50keV  : 3.76609E-02    ( -0.0125082   0.0313741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.27 using 59 PHA bins.
# Reduced chi-squared =         0.9513 for     56 degrees of freedom 
# Null hypothesis probability =   5.787432e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.08280 ( -0.25105  0.25073 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.67424e-07 ( -2.59335e-08  2.56856e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 134.864 sec.
Hardness ratio (energy fluence ratio) = 1.56429950394

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

S(15-50 keV)  = 1.8022845e-06
S(50-150 keV) = 3.443385e-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 = -1.395107656193708E-01, IMY = -4.121941653993130E-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:
-271.051400 -251.859800
-239.152000 -6.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6361  22.0261    0.4  41.2  -41.3  10.1608  28.7    0.7	Crab                          
135.5385 -40.5546    2.9  49.6 -167.6   2.0244   4.0    0.5	Vela X-1                      
134.9240 -43.6213    2.3  52.5 -166.0   2.7954   5.0 ------	UNKNOWN                       
 68.8843  31.4010    2.6  56.2  -33.2   5.4925   4.5 ------	UNKNOWN                       
 71.9876  23.5415    2.8  52.0  -42.1   4.4863   4.1 ------	UNKNOWN                       
 88.8673 -14.3101    4.9  41.2  -98.4   2.2025   2.4 ------	UNKNOWN                       
 98.9275 -33.1175    2.1  47.4 -127.2   4.8369   5.5 ------	UNKNOWN                       

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

Time interval of the image:
-6.000000 182.040000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7548  22.0805   89.5  41.1  -41.1  -0.0419  -0.1    7.8	Crab                          
135.4518 -40.4234    4.6  49.5 -167.5   1.0703   2.5    8.6	Vela X-1                      
163.8269  10.3743    2.3  39.5  107.3   3.8455   5.1 ------	UNKNOWN                       
147.6057   9.3678    0.4  23.5  108.7   8.2643  30.2 ------	UNKNOWN                       
 75.9864  31.9345    2.2  50.5  -30.6   2.5834   5.1 ------	UNKNOWN                       
112.6985 -37.0544    2.6  46.1 -143.5   1.8314   4.4 ------	UNKNOWN                       
104.0304 -39.1178    2.7  50.5 -135.9   3.7870   4.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
449.948600 603.048000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2221 -60.4832    5.1  25.0  123.0   3.6827   2.2    8.8	Cen X-3                       
186.5583 -62.9390  104.3  25.6  142.0   0.1664   0.1   10.5	GX 301-2                      
264.8108 -44.3360   10.4  54.5 -156.0   4.5211   1.1    7.4	4U 1735-44                    
198.3702 -41.0084    2.7  48.6  142.4  21.1924   4.2 ------	UNKNOWN                       
231.2515 -63.4745    2.7  32.1 -178.6   5.5104   4.3 ------	UNKNOWN                       
 61.3118 -57.0677    2.8  28.1  -18.5   4.8233   4.2 ------	UNKNOWN                       
 55.1414 -30.5829    3.1  54.8  -15.5  13.1691   3.7 ------	UNKNOWN                       
 45.5648 -34.4086    3.3  52.7  -26.2   9.0648   3.5 ------	UNKNOWN                       
295.8953 -52.0557    2.5  48.0 -129.0  19.6431   4.6 ------	UNKNOWN