GRB180602A

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 Jul  6 12:19:21 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger835200
======================================================================

  Trigger: 00835200      Segment: 000

  BAT Trigger Time: 549620112   [s; MET]
      Trigger Stop: 549620176   [s; MET]
               UTC: 2018-06-02T08:14:50.959800    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 142.33930428647   Dec: 32.0927735904  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.3
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.3

  Analysis Position:   [ source = BAT ]
    RA: 142.33930428647   Dec: 32.0927735904  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 142.3379578901   Dec: 32.0834759326783  [deg; J2000]  
        { 09h 29m 21.1s , +32d 05' 00.5" }
         +/- 1.48586983770063 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.59414834067352 [arcmin] (formal 1-sigma fit error)
    SNR: 17.2755375622003
 
  Angular difference between the analysis and refined position is 0.562042 arcmin
 
  Partial Coding Fraction: 0.7890625    [ including projection effects ]

  Duration
     T90: 53.203999876976 +/- 10.1974963735852
        Measured from: -32.3999999761581
                   to: 20.8039999008179     [s; relative to TRIGTIME]
     T50: 17.6000000238419 +/- 3.31492139140463
        Measured from: -22.37600004673
                   to: -4.77600002288818     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -19.5720000267029     
                   to: -18.5720000267029     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -39.3719999790192     
                   to: 30.2480000257492     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.928571   1.221477   0.693962   0.140133
           0.058479   0.061097   0.053935   0.047623 [error]
 Peak      0.023619   0.048572   0.039095   0.009362
           0.007248   0.007989   0.006664   0.005669 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   69.620  -39.372   30.248
T90    53.204  -32.400   20.804
T50    17.600  -22.376   -4.776
Peak    1.000  -19.572  -18.572
 
 
====== 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      -1.713    -0.114      0.113       -           -               -         2.69e-03     -1.82e-04          1.81e-04      45.030   57
CPL     -1.299    -0.441      0.496       77.605     -21.334       -77.605      4.49e-03     -1.84e-03          3.75e-03      42.470   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      -1.252     -0.294     0.303       -           -               -         8.13e-03     -1.43e-03          1.43e-03      49.940   57
CPL     -0.855     -1.190     1.477      149.098    -149.098      -149.098      1.28e-02     -5.97e-03          5.50e-02      49.600   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   2.92e-07  4.71e-07  5.75e-07  1.38e-06  1.73e-06  2.72e-06   erg/cm2
      90%_error_low -2.84e-08 -2.90e-08 -5.30e-08 -2.49e-07 -1.23e-07 -2.99e-07   erg/cm2
      90%_error_hi   2.91e-08  2.90e-08  5.33e-08  2.84e-07  1.24e-07  3.27e-07   erg/cm2
Peak flux       PL   2.64e-01  3.08e-01  2.59e-01  3.67e-01  9.62e-01  1.20e+00   ph/cm2/s
      90%_error_low -8.22e-02 -6.32e-02 -5.32e-02 -1.35e-01 -1.74e-01 -2.18e-01   ph/cm2/s
      90%_error_hi   8.97e-02  6.18e-02  5.24e-02  1.78e-01  1.75e-01  2.22e-01   ph/cm2/s
 
Fluence        CPL   2.76e-07  4.93e-07  5.77e-07  7.00e-07  1.66e-06  2.05e-06   erg/cm2
      90%_error_low -3.29e-08 -3.68e-08 -5.69e-08 -3.42e-07 -1.45e-07 -3.75e-07   erg/cm2
      90%_error_hi   3.33e-08  3.78e-08  5.66e-08  7.24e-07  1.46e-07  7.40e-07   erg/cm2
Peak flux      CPL   2.45e-01  3.20e-01  2.69e-01  2.35e-01  9.50e-01  1.07e+00   ph/cm2/s
      90%_error_low -9.72e-02 -7.13e-02 -6.01e-02 -2.35e-01 -1.79e-01 -2.59e-01   ph/cm2/s
      90%_error_hi   1.02e-01  7.68e-02  6.30e-02  1.79e-01  1.78e-01  2.79e-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
  142.3380    32.0835   0.0111    19.7070   128.2339         1.7815435     17.276 TRIG_00835200                 
 
Foreground time interval of the image:
-16.899  30.248 (delta_t =  47.147 [sec])
Background time interval of the image:

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  -39.372 sec. to   30.248 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71289     ( -0.114494   0.11251 )
Norm@50keV  : 2.68875E-03    ( -0.000182443   0.000180759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.03 using 59 PHA bins.
# Reduced chi-squared =         0.7900 for     57 degrees of freedom 
# Null hypothesis probability =   8.742984e-01
 
Photon flux (15-150 keV)    in 69.62 sec: 0.358734 ( -0.022183  0.022202 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.73171e-06 ( -1.23048e-07  1.24404e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -39.372 sec. to   30.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29883     ( -0.440629   0.495599 )
Epeak [keV] : 77.6052      ( -21.3341 -77.6052 )
Norm@50keV  : 4.49068E-03    ( -0.00184179   0.00374889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.47 using 59 PHA bins.
# Reduced chi-squared =         0.7585 for     56 degrees of freedom 
# Null hypothesis probability =   9.089224e-01
 
Photon flux (15-150 keV)    in 69.62 sec: 0.351080 ( -0.0236  0.023588 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.65872e-06 ( -1.44661e-07  1.45722e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from  -19.572 sec. to  -18.572 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.25175     ( -0.294277   0.302843 )
Norm@50keV  : 8.12887E-03    ( -0.00143247   0.00143195 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.94 using 59 PHA bins.
# Reduced chi-squared =         0.8761 for     57 degrees of freedom 
# Null hypothesis probability =   7.348818e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.961707 ( -0.174208  0.174663 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.13242e-08 ( -1.5684e-08  1.58453e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -19.572 sec. to  -18.572 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.854801     ( -1.18983   1.47672 )
Epeak [keV] : 149.098      ( -149.167 -149.167 )
Norm@50keV  : 1.28105E-02    ( -0.00596966   0.0549788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.60 using 59 PHA bins.
# Reduced chi-squared =         0.8856 for     56 degrees of freedom 
# Null hypothesis probability =   7.143947e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.949796 ( -0.178585  0.178094 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.92228e-08 ( -1.74368e-08  1.69406e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 53.204 sec.
Hardness ratio (energy fluence ratio) = 1.2202530727

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

S(15-50 keV)  = 7.632511e-07
S(50-150 keV) = 9.684789e-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 = -2.216738482059665E-01, IMY = -2.813543010671655E-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:

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

Time interval of the image:
-16.899400 30.248000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6337  22.0170    1.6  40.2 -110.9   2.2950   7.1    0.2	Crab                          
142.3380  32.0835    0.7  19.7  128.2   1.7816  17.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
113.500600 963.180000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
181.7411  12.8400    4.2  40.9   98.2   8.1291   2.7 ------	UNKNOWN                       
191.1488  35.6529    2.9  40.3   60.4   8.1755   4.1 ------	UNKNOWN                       
146.8506 -19.1950    3.0  51.5  163.8  11.2313   3.9 ------	UNKNOWN                       
109.6449  81.4456    3.4  50.8  -16.6   4.8257   3.4 ------	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