GRB170202A: 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: Wed Apr 12 15:31:57 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger736407
======================================================================

  Trigger: 00736407      Segment: 000

  BAT Trigger Time: 507752900.928   [s; MET]
      Trigger Stop: 507752901.952   [s; MET]
               UTC: 2017-02-02T18:28:02.373380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 152.528682988566   Dec: 5.0016939758479  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.32
     Image Trigger?:     NO
     Rate S/N Ratio:     12.2065556157337  [ if not an image trigger ]
     Image S/N Ratio:    7.32

  Analysis Position:   [ source = BAT ]
    RA: 152.528682988566   Dec: 5.0016939758479  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 152.525615058387   Dec: 5.02053063660171  [deg; J2000]  
        { 10h 10m 06.1s , +05d 01' 13.9" }
         +/- 1.01701634195233 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.290235259258344 [arcmin] (formal 1-sigma fit error)
    SNR: 29.6927147727886
 
  Angular difference between the analysis and refined position is 1.144979 arcmin
 
  Partial Coding Fraction: 0.5078125    [ including projection effects ]

  Duration
     T90: 37.7599999308586 +/- 11.7181140498057
        Measured from: 1.58000004291534
                   to: 39.339999973774     [s; relative to TRIGTIME]
     T50: 14.9399999380112 +/- 1.14490174350851
        Measured from: 7.64400005340576
                   to: 22.5839999914169     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 16.0440000295639     
                   to: 17.0440000295639     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.252000033855438     
                   to: 76.460000038147     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.616645   2.236103   1.380306   0.366774
           0.060700   0.063862   0.054860   0.044875 [error]
 Peak      0.104913   0.245464   0.193373   0.061862
           0.010105   0.012313   0.011517   0.008267 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   76.208    0.252   76.460
T90    37.760    1.580   39.340
T50    14.940    7.644   22.584
Peak    1.000   16.044   17.044
 
 
====== 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      -1.667    -0.067      0.067       -           -               -         4.72e-03     -1.76e-04          1.75e-04      66.520   57
CPL     -1.413    -0.256      0.274      113.258     -35.262      2235.562      6.35e-03     -1.46e-03          2.35e-03      63.650   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      -1.212     -0.097     0.097       -           -               -         4.04e-02     -2.40e-03          2.40e-03      80.340   57
CPL     -0.491     -0.411     0.460      110.449     -24.806        75.324      9.06e-02     -3.28e-02          5.94e-02      70.700   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   5.37e-07  8.91e-07  1.12e-06  2.82e-06  3.34e-06  5.37e-06   erg/cm2
      90%_error_low -3.44e-08 -3.41e-08 -5.52e-08 -2.90e-07 -1.31e-07 -3.33e-07   erg/cm2
      90%_error_hi   3.51e-08  3.40e-08  5.52e-08  3.13e-07  1.31e-07  3.50e-07   erg/cm2
Peak flux       PL   1.26e+00  1.51e+00  1.30e+00  1.92e+00  4.75e+00  5.99e+00   ph/cm2/s
      90%_error_low -1.33e-01 -1.02e-01 -9.02e-02 -2.58e-01 -2.87e-01 -3.77e-01   ph/cm2/s
      90%_error_hi   1.38e-01  1.01e-01  8.97e-02  2.81e-01  2.87e-01  3.81e-01   ph/cm2/s
 
Fluence        CPL   5.14e-07  9.13e-07  1.13e-06  1.90e-06  3.26e-06  4.46e-06   erg/cm2
      90%_error_low -4.10e-08 -4.02e-08 -5.79e-08 -5.98e-07 -1.51e-07 -6.15e-07   erg/cm2
      90%_error_hi   4.16e-08  4.07e-08  5.84e-08  9.17e-07  1.51e-07  9.28e-07   erg/cm2
Peak flux      CPL   1.09e+00  1.61e+00  1.40e+00  9.45e-01  4.65e+00  5.05e+00   ph/cm2/s
      90%_error_low -1.59e-01 -1.20e-01 -1.08e-01 -3.02e-01 -2.94e-01 -4.21e-01   ph/cm2/s
      90%_error_hi   1.63e-01  1.23e-01  1.10e-01  4.50e-01  2.94e-01  5.07e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  152.5256     5.0205   0.0065    26.4743    80.0823         1.8268020     29.693 TRIG_00736407                 
 
Foreground time interval of the image:
  0.252  13.173 (delta_t =  12.921 [sec])
Background time interval of the image:
-233.627   0.252 (delta_t = 233.879 [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    0.252 sec. to   76.460 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66733     ( -0.0671575   0.0669358 )
Norm@50keV  : 4.71690E-03    ( -0.000175714   0.000175357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.52 using 59 PHA bins.
# Reduced chi-squared =          1.167 for     57 degrees of freedom 
# Null hypothesis probability =   1.819769e-01
 
Photon flux (15-150 keV)    in 76.21 sec: 0.619497 ( -0.023723  0.023774 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.33812e-06 ( -1.30728e-07  1.31261e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.252 sec. to   76.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41251     ( -0.256429   0.274498 )
Epeak [keV] : 113.258      ( -35.2662 2235.56 )
Norm@50keV  : 6.35489E-03    ( -0.00146467   0.00234522 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.65 using 59 PHA bins.
# Reduced chi-squared =          1.137 for     56 degrees of freedom 
# Null hypothesis probability =   2.252778e-01
 
Photon flux (15-150 keV)    in 76.21 sec: 0.609953 ( -0.02551  0.025534 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.26372e-06 ( -1.51054e-07  1.50507e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   16.044 sec. to   17.044 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21197     ( -0.0965727   0.0968207 )
Norm@50keV  : 4.04013E-02    ( -0.00240258   0.00240226 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          80.34 using 59 PHA bins.
# Reduced chi-squared =          1.409 for     57 degrees of freedom 
# Null hypothesis probability =   2.253397e-02
 
Photon flux (15-150 keV)    in 1 sec: 4.75046 ( -0.28732  0.2875 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.08564e-07 ( -2.70153e-08  2.71284e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   16.044 sec. to   17.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.491293     ( -0.411133   0.459519 )
Epeak [keV] : 110.449      ( -24.8061 75.3241 )
Norm@50keV  : 9.05799E-02    ( -0.0327982   0.0593535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.70 using 59 PHA bins.
# Reduced chi-squared =          1.262 for     56 degrees of freedom 
# Null hypothesis probability =   8.935313e-02
 
Photon flux (15-150 keV)    in 1 sec: 4.64810 ( -0.29402  0.29378 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.92202e-07 ( -2.96336e-08  2.93877e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 37.76 sec.
Hardness ratio (energy fluence ratio) = 1.25939024851

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

S(15-50 keV)  = 1.4284948e-06
S(50-150 keV) = 1.9096813e-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 = 8.577626962315610E-02, IMY = -4.905803447971110E-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:
-233.627400 0.252000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5153 -40.5504    1.7  52.2    9.7   4.1671   6.8    0.7	Vela X-1                      
170.2896 -60.5993    6.4  56.6  -26.1   1.7205   1.8    1.6	Cen X-3                       
133.8416 -19.7956    3.2  45.1   35.9   1.7501   3.7 ------	UNKNOWN                       
146.7535 -38.5454    2.7  44.1    4.6   1.3066   4.3 ------	UNKNOWN                       
153.6847 -40.6670    3.1  42.1   -3.3   1.0892   3.7 ------	UNKNOWN                       
228.0809  18.3547    3.3  54.9 -146.3   4.5017   3.5 ------	UNKNOWN                       
222.7403  -2.2904    2.9  45.4 -121.2   3.6530   4.0 ------	UNKNOWN                       

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

Time interval of the image:
0.252000 13.172590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6558 -40.5308    4.9  52.1    9.6  -0.3332  -2.4    6.0	Vela X-1                      
170.2879 -60.5578   11.7  56.5  -26.1   0.1894   1.0    4.0	Cen X-3                       
152.5256   5.0205    0.4  26.5   80.1   1.8268  29.7 ------	UNKNOWN                       
157.7831 -19.3759    2.3  24.3   19.8   0.2411   5.1 ------	UNKNOWN                       
189.8435  15.4679    1.9  23.3 -178.4   0.2793   6.0 ------	UNKNOWN                       
155.7863 -51.3414    3.1  50.4  -12.9   0.3224   3.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
61.772600 962.084000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5379 -40.5629    0.8  48.1  -20.2  16.2457  14.9    0.7	Vela X-1                      
136.2505  32.5731    3.2  31.5  115.5   3.2991   3.6 ------	UNKNOWN                       
123.9198  -3.8668    3.3  29.9   35.7   2.0818   3.5 ------	UNKNOWN                       
106.1391 -28.3284    4.1  55.7   12.9  10.2234   3.4 ------	UNKNOWN                       
106.3200 -28.3941    5.7  55.6   12.8   8.1401   2.8 ------	UNKNOWN                       
121.0588 -23.3387    2.8  41.8    8.4   3.1668   4.1 ------	UNKNOWN                       
198.3221  45.8504    3.1  56.9  179.0  12.6579   3.7 ------	UNKNOWN                       
197.4606  -1.1353    3.4  45.3 -121.0   8.0174   3.4 ------	UNKNOWN