GRB180704A: 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: Mon Aug  6 18:41:55 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger846088
======================================================================

  Trigger: 00846088      Segment: 000

  BAT Trigger Time: 552375424.064   [s; MET]
      Trigger Stop: 552375425.088   [s; MET]
               UTC: 2018-07-04T05:36:42.855940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 32.6378994196206   Dec: 69.9477861437904  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.74
     Image Trigger?:     NO
     Rate S/N Ratio:     34.8711915483254  [ if not an image trigger ]
     Image S/N Ratio:    7.74

  Analysis Position:   [ source = BAT ]
    RA: 32.6378994196206   Dec: 69.9477861437904  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 32.6044440870851   Dec: 69.9653443591817  [deg; J2000]  
        { 02h 10m 25.1s , +69d 57' 55.2" }
         +/- 1.32640477295966 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.446230097852468 [arcmin] (formal 1-sigma fit error)
    SNR: 20.3173397436301
 
  Angular difference between the analysis and refined position is 1.258235 arcmin
 
  Partial Coding Fraction: 0.07421875    [ including projection effects ]

  Duration
     T90: 19.6560000181198 +/- 1.40470642375823
        Measured from: -17.1360000371933
                   to: 2.51999998092651     [s; relative to TRIGTIME]
     T50: 14.5839999914169 +/- 0.815580766685976
        Measured from: -14.1759999990463
                   to: 0.407999992370605     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0440000295639038     
                   to: 1.0440000295639     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -17.8960000276566     
                   to: 4.23599994182587     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.272130   2.399375   2.915270   1.373437
           0.132981   0.151889   0.147129   0.121904 [error]
 Peak      0.125741   0.340966   0.460087   0.155557
           0.031556   0.039442   0.044610   0.036333 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   22.132  -17.896    4.236
T90    19.656  -17.136    2.520
T50    14.584  -14.176    0.408
Peak    1.000    0.044    1.044
 
 
====== 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: 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      -1.224    -0.100      0.102       -           -               -         2.76e-02     -1.67e-03          1.66e-03      76.370   57
CPL     -0.868    -0.391      0.459      194.054     -75.868      -194.054      3.90e-02     -1.20e-02          2.08e-02      74.260   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      -1.108     -0.182     0.183       -           -               -         8.24e-02     -9.70e-03          9.67e-03      68.970   57
CPL      0.379     -0.934     1.201      100.552     -19.784        63.635      3.31e-01     -1.90e-01          6.12e-01      60.760   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   6.03e-07  1.31e-06  2.24e-06  8.86e-06  6.15e-06  1.30e-05   erg/cm2
      90%_error_low -7.27e-08 -9.84e-08 -1.41e-07 -1.19e-06 -3.67e-07 -1.26e-06   erg/cm2
      90%_error_hi   7.61e-08  9.77e-08  1.41e-07  1.31e-06  3.67e-07  1.35e-06   erg/cm2
Peak flux       PL   3.12e-04  3.82e-03  8.81e-03  4.13e+00  3.36e-02  4.13e+00   ph/cm2/s
      90%_error_low -1.11e-05 -9.81e-05     N/A   -4.67e-01     N/A   -4.23e-01   ph/cm2/s
      90%_error_hi   3.11e-04  3.41e-03     N/A    1.67e+00     N/A    1.79e+00   ph/cm2/s
 
Fluence        CPL   5.44e-07  1.33e-06  2.35e-06  6.03e-06  6.11e-06  1.03e-05   erg/cm2
      90%_error_low -9.59e-08 -1.04e-07 -1.87e-07 -2.08e-06 -3.74e-07 -2.07e-06   erg/cm2
      90%_error_hi   1.00e-07  1.05e-07  1.90e-07  3.22e-06  3.73e-07  3.23e-06   erg/cm2
Peak flux      CPL   1.45e+00  3.05e+00  3.37e+00  1.93e+00  9.14e+00  9.80e+00   ph/cm2/s
      90%_error_low -5.99e-01 -5.04e-01 -5.05e-01 -7.67e-01 -1.18e+00 -1.46e+00   ph/cm2/s
      90%_error_hi   7.04e-01  4.92e-01  5.23e-01  1.26e+00  1.19e+00  1.70e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   32.6044    69.9653   0.0095    57.6762   -18.1255         8.3681991     20.317 TRIG_00846088                 
 
Foreground time interval of the image:
-17.896   4.236 (delta_t =  22.132 [sec])
Background time interval of the image:
-239.064 -17.896 (delta_t = 221.168 [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  -17.896 sec. to    4.236 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.2244     ( -0.100306   0.101665 )
Norm@50keV  : 2.75889E-02    ( -0.00166649   0.0016605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.37 using 59 PHA bins.
# Reduced chi-squared =          1.340 for     57 degrees of freedom 
# Null hypothesis probability =   4.431561e-02
 
Photon flux (15-150 keV)    in 22.13 sec: 3.24996 ( -0.21322  0.21421 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.15307e-06 ( -3.6703e-07  3.67438e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -17.896 sec. to    4.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.868278     ( -0.390702   0.459336 )
Epeak [keV] : 194.054      ( -75.8682 -194.054 )
Norm@50keV  : 3.89801E-02    ( -0.0120026   0.0208127 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.26 using 59 PHA bins.
# Reduced chi-squared =          1.326 for     56 degrees of freedom 
# Null hypothesis probability =   5.166416e-02
 
Photon flux (15-150 keV)    in 22.13 sec: 3.19388 ( -0.22201  0.22327 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.11226e-06 ( -3.73986e-07  3.73059e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.044 sec. to    1.044 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10804     ( -0.181505   0.182672 )
Norm@50keV  : 8.24408E-02    ( -0.00970206   0.00967261 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.97 using 59 PHA bins.
# Reduced chi-squared =          1.210 for     57 degrees of freedom 
# Null hypothesis probability =   1.329337e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.36155E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.59825e-07 ( -1.04089e-07  1.04248e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.044 sec. to    1.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.379232     ( -0.935097   1.20003 )
Epeak [keV] : 100.552      ( -19.7677 63.6515 )
Norm@50keV  : 0.331316    ( -0.189886   0.612183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.76 using 59 PHA bins.
# Reduced chi-squared =          1.085 for     56 degrees of freedom 
# Null hypothesis probability =   3.083305e-01
 
Photon flux (15-150 keV)    in 1 sec: 9.13872 ( -1.18103  1.19118 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.1749e-08 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = 1.501965875803406E+00, IMY = 4.916569183025535E-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:
-239.064000 -17.896000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
306.1083  74.7457    3.9  56.1   10.8   3.4748   3.0 ------	UNKNOWN                       
144.8029  80.7874    2.5  34.5   -4.8   1.0748   4.6 ------	UNKNOWN                       
102.7298  57.4891    2.1  36.8  -50.6   1.8265   5.4 ------	UNKNOWN                       
104.9119  39.9630    3.1  41.3  -77.8   3.8740   3.8 ------	UNKNOWN                       

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

Time interval of the image:
-17.896000 4.236000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
229.3719  52.6456    2.3  42.2   56.4   1.1188   5.1 ------	UNKNOWN                       
209.2385  64.2171    2.4  30.8   38.5   0.3887   4.8 ------	UNKNOWN                       
164.2540  70.9584    2.3  24.2    1.7   0.3174   5.1 ------	UNKNOWN                       
 32.6044  69.9653    0.6  57.7  -18.1   8.3681  20.3 ------	UNKNOWN                       
140.0597   6.0459    2.5  45.0 -147.8   0.5352   4.5 ------	UNKNOWN                       
111.5284  49.0135    3.0  33.5  -67.0   0.4016   3.8 ------	UNKNOWN                       
139.5487  -3.4382    2.4  54.0 -151.5   1.0663   4.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
581.236600 963.052300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9650 -15.6393    0.6  37.9  126.6  24.4954  18.3    0.8	Sco X-1                       
254.4794  35.3897   29.5  16.0  -19.2  -0.1512  -0.4    3.0	Her X-1                       
268.2910  -1.5672    8.8  33.6   80.1  -1.5107  -1.3    8.3	SW J1753.5-0127               
288.8011  10.9521    6.1  44.2   45.4   2.7418   1.9    0.4	GRS 1915+105                  
299.5627  35.2195   10.4  49.8   10.1   1.1965   1.1    1.7	Cyg X-1                       
308.2775  40.9292    5.1  56.5    2.9   4.2591   2.3    7.7	Cyg X-3                       
275.0992   7.1849    0.4  33.6   60.0  26.1279  31.1 ------	UNKNOWN                       
253.5982  58.3089    3.2  36.7  -43.4   2.3134   3.6 ------	UNKNOWN