GRB170524A: 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 Jun 21 15:55:22 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger754322
======================================================================

  Trigger: 00754322      Segment: 000

  BAT Trigger Time: 517348174.62   [s; MET]
      Trigger Stop: 517348174.684   [s; MET]
               UTC: 2017-05-24T19:49:15.509460    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 319.455997372106   Dec: 48.5875485410596  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.12
     Image Trigger?:     NO
     Rate S/N Ratio:     24.8797106092495  [ if not an image trigger ]
     Image S/N Ratio:    9.12

  Analysis Position:   [ source = BAT ]
    RA: 319.455997372106   Dec: 48.5875485410596  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 319.488869713287   Dec: 48.604151061416  [deg; J2000]  
        { 21h 17m 57.3s , +48d 36' 14.9" }
         +/- 2.04751411080642 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.01375011060369 [arcmin] (formal 1-sigma fit error)
    SNR: 10.9271905868654
 
  Angular difference between the analysis and refined position is 1.641304 arcmin
 
  Partial Coding Fraction: 0.96875    [ including projection effects ]

  Duration
     T90: 0.1039999127388 +/- 0.0178885800721685
        Measured from: 0.00400000810623169
                   to: 0.107999920845032     [s; relative to TRIGTIME]
     T50: 0.059999942779541 +/- 0.0215406254038245
        Measured from: 0.0120000243186951
                   to: 0.0719999670982361     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.438000023365021     
                   to: 0.561999976634979     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.120000004768372     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.011250   0.017660   0.021116   0.004922
           0.002480   0.002985   0.002905   0.001846 [error]
 Peak      0.018706   0.020717   0.023737   0.007405
           0.006203   0.006264   0.005628   0.004287 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.120    0.000    0.120
T90     0.104    0.004    0.108
T50     0.060    0.012    0.072
Peak    1.000   -0.438    0.562
 
 
====== 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      -1.069    -0.235      0.241       -           -               -         2.96e-02     -4.47e-03          4.46e-03      47.680   57
CPL     -0.455    -0.728      1.181      142.215     -60.009      -142.215      5.70e-02     -3.05e-02          1.26e-01      46.450   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      -1.301     -0.426     0.431       -           -               -         4.27e-03     -1.14e-03          1.14e-03      57.480   57
CPL      0.361     -1.824     3.426       74.071     -19.876       -74.071      2.72e-02     -2.72e-02          7.59e-01      55.470   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   3.04e-09  7.27e-09  1.39e-08  6.44e-08  3.75e-08  8.86e-08   erg/cm2
      90%_error_low -7.99e-10 -1.26e-09 -2.38e-09 -2.07e-08 -6.16e-09 -2.27e-08   erg/cm2
      90%_error_hi   8.55e-10  1.24e-09  2.34e-09  2.61e-08  6.19e-09  2.72e-08   erg/cm2
Peak flux       PL   1.45e-01  1.64e-01  1.33e-01  1.81e-01  5.09e-01  6.24e-01   ph/cm2/s
      90%_error_low -6.16e-02 -4.88e-02 -4.19e-02 -9.20e-02 -1.38e-01 -1.70e-01   ph/cm2/s
      90%_error_hi   6.99e-02  4.79e-02  4.13e-02  1.35e-01  1.38e-01  1.75e-01   ph/cm2/s
 
Fluence        CPL   2.67e-09  7.72e-09  1.50e-08  3.10e-08  3.70e-08  5.63e-08   erg/cm2
      90%_error_low -9.91e-10 -1.45e-09 -2.93e-09 -1.95e-08 -3.59e-09 -2.02e-08   erg/cm2
      90%_error_hi   1.02e-09  1.52e-09  3.07e-09  4.14e-08  6.34e-09  4.21e-08   erg/cm2
Peak flux      CPL   1.03e-01  1.86e-01  1.54e-01  4.96e-02  4.82e-01  4.93e-01   ph/cm2/s
      90%_error_low -7.41e-02 -5.99e-02 -5.21e-02 -4.96e-02 -1.43e-01 -1.53e-01   ph/cm2/s
      90%_error_hi   8.59e-02  6.18e-02  5.57e-02  1.76e-01  1.43e-01  2.18e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  319.4889    48.6042   0.0176    10.9843   -77.4637         0.0549190     10.927 TRIG_00754322                 
 
Foreground time interval of the image:
  0.000   0.120 (delta_t =   0.120 [sec])
Background time interval of the image:
-239.620   0.000 (delta_t = 239.620 [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    0.000 sec. to    0.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06933     ( -0.235145   0.24083 )
Norm@50keV  : 2.96098E-02    ( -0.00446625   0.00445842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.68 using 59 PHA bins.
# Reduced chi-squared =         0.8365 for     57 degrees of freedom 
# Null hypothesis probability =   8.057291e-01
 
Photon flux (15-150 keV)    in 0.12 sec: 3.42505 ( -0.52443  0.52491 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.75251e-08 ( -6.16182e-09  6.18798e-09 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.000 sec. to    0.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.455252     ( -0.728196   1.18131 )
Epeak [keV] : 142.215      ( -60.009 -142.215 )
Norm@50keV  : 5.70185E-02    ( -0.0305133   0.1264 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.45 using 59 PHA bins.
# Reduced chi-squared =         0.8295 for     56 degrees of freedom 
# Null hypothesis probability =   8.147032e-01
 
Photon flux (15-150 keV)    in 0.12 sec: 3.39630 ( -0.52951  0.52851 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.69991e-08 ( -3.58567e-09  6.33612e-09 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.438 sec. to    0.562 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30088     ( -0.42631   0.431071 )
Norm@50keV  : 4.26771E-03    ( -0.00113987   0.00113765 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.48 using 59 PHA bins.
# Reduced chi-squared =          1.009 for     57 degrees of freedom 
# Null hypothesis probability =   4.571065e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.509244 ( -0.137587  0.138067 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.21677e-08 ( -1.22375e-08  1.24861e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.438 sec. to    0.562 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.361456     ( -1.82371   3.4259 )
Epeak [keV] : 74.0713      ( -19.8763 -74.0714 )
Norm@50keV  : 2.71941E-02    ( -0.0271939   0.758801 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.47 using 59 PHA bins.
# Reduced chi-squared =         0.9905 for     56 degrees of freedom 
# Null hypothesis probability =   4.949623e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.481666 ( -0.143446  0.143084 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.86242e-08 ( -1.21691e-08  1.31699e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.1039999 sec.
Hardness ratio (energy fluence ratio) = 1.90620627346

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

S(15-50 keV)  = 1.0305259e-08
S(50-150 keV) = 2.721999e-08

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 = 4.213017554193794E-02, IMY = 1.894690431926533E-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:
-239.620000 0.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5052  35.3115    8.2  39.3  138.7   0.7064   1.4    3.0	Her X-1                       
288.6332  10.9534   10.9  35.8   71.9   0.5218   1.1    9.7	GRS 1915+105                  
299.5890  35.1894    0.3   9.6   71.7   6.8579  33.5    0.7	Cyg X-1                       
308.0372  40.8619    1.7   3.6    6.7   1.3059   6.6    6.4	Cyg X-3                       
326.1890  38.1578   16.0  16.8  -34.2  -0.1564  -0.7    9.9	Cyg X-2                       
  4.8084  35.8051    3.4  45.5  -57.8   4.0924   3.4 ------	UNKNOWN                       
 25.6364  78.9779    2.8  45.4 -121.3   3.9102   4.1 ------	UNKNOWN                       

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

Time interval of the image:
0.000000 0.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4608  35.3816   39.7  39.3  138.8   0.0030   0.3    2.4	Her X-1                       
288.8001  10.7635    0.0  36.0   71.5   0.0328   3.0   10.9	GRS 1915+105                  
299.5974  34.9920    0.0   9.8   71.2  -0.0055  -1.0   12.6	Cyg X-1                       
307.9891  40.8302   17.0   3.6    7.5  -0.0032  -0.7    9.2	Cyg X-3                       
326.4208  38.2653    0.0  16.9  -34.8  -0.0105  -2.1   12.2	Cyg X-2                       
319.4889  48.6041    1.1  11.0  -77.5   0.0549  10.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
44.480620 839.352100
840.380000 962.420000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5843  35.1938    0.3  19.8   78.1  26.7043  35.6    0.6	Cyg X-1                       
308.1190  40.9706    1.2  11.0   73.9   5.8948   9.7    1.2	Cyg X-3                       
326.2030  38.4351    4.8  11.3   -5.1   1.5685   2.4    7.0	Cyg X-2                       
326.2812  -1.7234    3.6  50.6   14.3   5.3138   3.3 ------	UNKNOWN                       
315.7389  35.4166    3.1  13.4   36.2   2.2707   3.7 ------	UNKNOWN                       
355.6049   2.6826    3.1  55.3  -22.6   9.3809   3.7  308.9	UNKNOWN                       
129.9833  76.0688    3.4  55.2 -154.1  12.9481   3.4 ------	UNKNOWN                       
 57.7764  69.5567    3.4  48.0 -129.1  13.0347   3.4 ------	UNKNOWN                       
 45.2096  65.4719    2.9  45.4 -121.3  13.2326   4.0 ------	UNKNOWN