GRB170519A

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  7 16:49:19 EDT 2017
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger753445
======================================================================

  Trigger: 00753445      Segment: 000

  BAT Trigger Time: 516863421.888   [s; MET]
      Trigger Stop: 516863425.984   [s; MET]
               UTC: 2017-05-19T05:10:02.805780    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 163.45003598818   Dec: 25.3780364633414  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.3
     Image Trigger?:     NO
     Rate S/N Ratio:     14.3527000944073  [ if not an image trigger ]
     Image S/N Ratio:    10.3

  Analysis Position:   [ source = BAT ]
    RA: 163.45003598818   Dec: 25.3780364633414  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 163.42952389056   Dec: 25.380288299753  [deg; J2000]  
        { 10h 53m 43.1s , +25d 22' 49.0" }
         +/- 1.47499724032404 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.477745590393688 [arcmin] (formal 1-sigma fit error)
    SNR: 17.4577424911478
 
  Angular difference between the analysis and refined position is 1.120128 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 220.251999914646 +/- 143.838515308131
        Measured from: -24.027999997139
                   to: 196.223999917507     [s; relative to TRIGTIME]
     T50: 17.8279999494553 +/- 140.066483600232
        Measured from: -6.95200002193451
                   to: 10.8759999275208     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.835999965667725     
                   to: 1.83599996566772     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -30.1999999880791     
                   to: 201.263999998569     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.817731   0.853134   0.451910   0.047711
           0.084036   0.087723   0.077524   0.071115 [error]
 Peak      0.020203   0.041522   0.018445   0.011681
           0.005854   0.006144   0.005494   0.004712 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  231.464  -30.200  201.264
T90   220.252  -24.028  196.224
T50    17.828   -6.952   10.876
Peak    1.000    0.836    1.836
 
 
====== 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      -1.948    -0.243      0.228       -           -               -         5.25e-04     -8.23e-05          7.97e-05      41.410   57
CPL     -2.070    -0.180      0.765       31.877      N/A           N/A         4.45e-04        N/A               N/A         41.210   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      -1.396     -0.355     0.356       -           -               -         5.61e-03     -1.16e-03          1.15e-03      60.310   57
CPL     -1.399     -0.351     1.223     9999.360    -9999.360      -9999.360      5.61e-03     -1.16e-03          4.24e-02      60.310   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   2.37e-07  3.32e-07  3.44e-07  6.54e-07  1.12e-06  1.57e-06   erg/cm2
      90%_error_low -3.87e-08 -3.89e-08 -7.32e-08 -2.41e-07 -1.65e-07 -3.29e-07   erg/cm2
      90%_error_hi   3.95e-08  3.87e-08  7.54e-08  3.24e-07  1.70e-07  3.96e-07   erg/cm2
Peak flux       PL   2.09e-01  2.24e-01  1.70e-01  2.10e-01  6.82e-01  8.13e-01   ph/cm2/s
      90%_error_low -6.83e-02 -4.75e-02 -4.45e-02 -9.41e-02 -1.36e-01 -1.69e-01   ph/cm2/s
      90%_error_hi   7.33e-02  4.66e-02  4.40e-02  1.35e-01  1.36e-01  1.74e-01   ph/cm2/s
 
Fluence        CPL   2.37e-07  2.96e-07  3.04e-07  6.97e-07  1.09e-06  1.58e-06   erg/cm2
      90%_error_low -4.69e-08 -1.11e-07 -5.63e-08 -2.72e-07 -2.00e-07 -4.00e-07   erg/cm2
      90%_error_hi   3.98e-08  7.61e-08  7.01e-08  1.33e-07  1.49e-07  1.70e-07   erg/cm2
Peak flux      CPL   2.09e-01  2.23e-01  1.70e-01  2.11e-01  6.83e-01  8.19e-01   ph/cm2/s
      90%_error_low -7.31e-02 -4.69e-02 -4.42e-02     N/A   -6.98e-02 -2.53e-01   ph/cm2/s
      90%_error_hi   6.51e-02  6.28e-02  4.63e-02     N/A    1.36e-01  1.57e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  163.4295    25.3803   0.0111    13.0237   160.6342         1.6839444     17.458 TRIG_00753445                 
 
Foreground time interval of the image:
-30.200  35.613 (delta_t =  65.813 [sec])
Background time interval of the image:
-713.287 -695.698 (delta_t =  17.589 [sec])
-239.888 -30.200 (delta_t = 209.688 [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

Bokeh Plot

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  -30.200 sec. to  201.264 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.94814     ( -0.242673   0.228056 )
Norm@50keV  : 5.25385E-04    ( -8.23195e-05   7.96964e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.41 using 59 PHA bins.
# Reduced chi-squared =         0.7265 for     57 degrees of freedom 
# Null hypothesis probability =   9.400895e-01
 
Photon flux (15-150 keV)    in 231.5 sec: 7.69921E-02 ( -0.0088509  0.008851 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11941e-06 ( -1.64529e-07  1.69848e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -30.200 sec. to  201.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.16285     ( -0.0872157   0.857529 )
Epeak [keV] : 67.4866      (   )
Norm@50keV  : 4.02085E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.15 using 59 PHA bins.
# Reduced chi-squared =         0.7349 for     56 degrees of freedom 
# Null hypothesis probability =   9.313585e-01
 
Photon flux (15-150 keV)    in 231.5 sec: 7.17152E-02 ( -0.0214052  0.0140112 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09064e-06 ( -2.00021e-07  1.48532e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.836 sec. to    1.836 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39561     ( -0.354674   0.356212 )
Norm@50keV  : 5.60541E-03    ( -0.00116247   0.0011455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.31 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     57 degrees of freedom 
# Null hypothesis probability =   3.570587e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.681969 ( -0.135742  0.135864 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.42188e-08 ( -1.25415e-08  1.29009e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.836 sec. to    1.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39892     ( -0.352989   1.22098 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 5.61118E-03    ( -0.00116408   0.042395 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.31 using 59 PHA bins.
# Reduced chi-squared =          1.077 for     56 degrees of freedom 
# Null hypothesis probability =   3.227440e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.682824 ( -0.069829  0.135611 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.43588e-08 ( -1.56945e-08  1.00552e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 220.252 sec.
Hardness ratio (energy fluence ratio) = 1.03662080449

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

S(15-50 keV)  = 5.686437e-07
S(50-150 keV) = 5.507773e-07

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 = -2.182161826913611E-01, IMY = -7.669959570072656E-02

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:
-713.287400 -695.698000
-239.888000 -30.200000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
143.8059  34.9781    2.0  18.1 -123.4   1.1583   5.6 ------	UNKNOWN                       
133.3504  19.0137    3.0  34.3 -144.8   1.0514   3.8 ------	UNKNOWN                       
111.1831  67.9066    2.7  42.0  -57.4   2.5273   4.3 ------	UNKNOWN

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

Time interval of the image:
-30.200000 35.612590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
163.4295  25.3803    0.7  13.0  160.6   1.6840  17.4 ------	UNKNOWN                       
149.7552   4.6811    2.0  36.7  178.0   0.7548   5.7 ------	UNKNOWN                       
 35.4355  86.7251    2.6  54.0  -33.1   1.9432   4.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
69.612600 842.412000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
168.5369  70.5613    2.7  45.3  -22.8   2.8551   4.3 ------	UNKNOWN                       
123.6059  -4.6699    3.1  49.0 -147.3   3.6305   3.8 ------	UNKNOWN                       
116.7462   7.2234    3.5  48.0 -129.0   6.1319   3.3 ------	UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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