GRB180324A: 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: Thu May 31 10:58:23 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger817345
======================================================================

  Trigger: 00817345      Segment: 000

  BAT Trigger Time: 543559050.304   [s; MET]
      Trigger Stop: 543559050.816   [s; MET]
               UTC: 2018-03-24T04:37:09.631100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 76.5845390141635   Dec: 56.7246966581087  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    18.63
     Image Trigger?:     NO
     Rate S/N Ratio:     73.9864852523757  [ if not an image trigger ]
     Image S/N Ratio:    18.63

  Analysis Position:   [ source = BAT ]
    RA: 76.5845390141635   Dec: 56.7246966581087  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 76.5810188019364   Dec: 56.7435464022776  [deg; J2000]  
        { 05h 06m 19.4s , +56d 44' 36.8" }
         +/- 1.37917894234048 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.533598528397135 [arcmin] (formal 1-sigma fit error)
    SNR: 19.2158834006703
 
  Angular difference between the analysis and refined position is 1.136903 arcmin
 
  Partial Coding Fraction: 0.78125    [ including projection effects ]

  Duration
     T90: 7.21599996089935 +/- 1.30228724554167
        Measured from: -4.7720000743866
                   to: 2.44399988651276     [s; relative to TRIGTIME]
     T50: 0.543999910354614 +/- 0.199719810945016
        Measured from: 0.0199999809265137
                   to: 0.563999891281128     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.128000020980835     
                   to: 0.871999979019165     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -5.36000001430511     
                   to: 3.6599999666214     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.256556   0.332722   0.256455   0.070931
           0.022602   0.023943   0.021125   0.017669 [error]
 Peak      0.128798   0.185553   0.206617   0.050883
           0.009892   0.011137   0.010747   0.007490 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    9.020   -5.360    3.660
T90     7.216   -4.772    2.444
T50     0.544    0.020    0.564
Peak    1.000   -0.128    0.872
 
 
====== 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      -1.453    -0.144      0.143       -           -               -         6.54e-03     -5.19e-04          5.16e-04      63.970   57
CPL     -1.425    -0.172      0.407      981.118    -981.118      -981.118      6.76e-03        N/A               N/A         64.060   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      -1.165     -0.104     0.104       -           -               -         3.74e-02     -2.20e-03          2.20e-03      57.770   57
CPL     -0.851     -0.357     0.451      207.953     -90.405      -207.953      5.18e-02     -1.60e-02          2.97e-02      56.100   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   7.20e-08  1.36e-07  1.99e-07  6.21e-07  5.64e-07  1.03e-06   erg/cm2
      90%_error_low -9.78e-09 -1.12e-08 -2.10e-08 -1.32e-07 -4.99e-08 -1.49e-07   erg/cm2
      90%_error_hi   1.02e-08  1.11e-08  2.08e-08  1.55e-07  5.05e-08  1.69e-07   erg/cm2
Peak flux       PL   1.12e+00  1.37e+00  1.22e+00  1.88e+00  4.36e+00  5.60e+00   ph/cm2/s
      90%_error_low -1.26e-01 -9.60e-02 -8.39e-02 -2.64e-01 -2.64e-01 -3.53e-01   ph/cm2/s
      90%_error_hi   1.32e-01  9.53e-02  8.33e-02  2.89e-01  2.64e-01  3.58e-01   ph/cm2/s
 
Fluence        CPL   6.35e-08  8.42e-08  8.57e-08  1.92e-07  2.84e-07  4.23e-07   erg/cm2
      90%_error_low -1.15e-08 -1.73e-08 -1.63e-08    N/A    -5.58e-08 -7.62e-08   erg/cm2
      90%_error_hi   1.00e-08  7.35e-09  1.47e-08    N/A     5.24e-08  7.05e-08   erg/cm2
Peak flux      CPL   1.03e+00  1.40e+00  1.27e+00  1.38e+00  4.31e+00  5.08e+00   ph/cm2/s
      90%_error_low -1.64e-01 -1.03e-01 -1.03e-01 -4.47e-01 -2.75e-01 -5.42e-01   ph/cm2/s
      90%_error_hi   1.71e-01  1.04e-01  1.05e-01  3.88e-01  2.75e-01  6.95e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   76.5810    56.7435   0.0100    18.0357   121.7817         0.9300770     19.216 TRIG_00817345                 
 
Foreground time interval of the image:
 -5.360   3.660 (delta_t =   9.020 [sec])
Background time interval of the image:
-239.304  -5.360 (delta_t = 233.944 [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   -5.360 sec. to    3.660 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45328     ( -0.144205   0.143026 )
Norm@50keV  : 6.53552E-03    ( -0.000518919   0.000516363 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.97 using 59 PHA bins.
# Reduced chi-squared =          1.122 for     57 degrees of freedom 
# Null hypothesis probability =   2.451820e-01
 
Photon flux (15-150 keV)    in 9.02 sec: 0.806086 ( -0.063405  0.063514 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.63841e-07 ( -4.99436e-08  5.04533e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -5.360 sec. to    3.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45054     ( -0.172422   0.406981 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 6.55672E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.98 using 59 PHA bins.
# Reduced chi-squared =          1.142 for     56 degrees of freedom 
# Null hypothesis probability =   2.168197e-01
 
Photon flux (15-150 keV)    in 9.02 sec: 0.810758 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.84267e-07 ( -5.57932e-08  5.23891e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.128 sec. to    0.872 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.16529     ( -0.103986   0.104072 )
Norm@50keV  : 3.73536E-02    ( -0.0022006   0.00220057 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.77 using 59 PHA bins.
# Reduced chi-squared =          1.014 for     57 degrees of freedom 
# Null hypothesis probability =   4.465488e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.36435 ( -0.2638  0.26407 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.82825e-07 ( -2.52394e-08  2.53534e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.128 sec. to    0.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.85126     ( -0.356632   0.451377 )
Epeak [keV] : 207.953      ( -90.4041 -207.952 )
Norm@50keV  : 5.17807E-02    ( -0.0159741   0.0297232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.10 using 59 PHA bins.
# Reduced chi-squared =          1.002 for     56 degrees of freedom 
# Null hypothesis probability =   4.709507e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.30539 ( -0.27491  0.27477 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13493e-07 ( -1.63078e-08  1.02983e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 7.216 sec.
Hardness ratio (energy fluence ratio) = 1.4607970015

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

S(15-50 keV)  = 2.0827687e-07
S(50-150 keV) = 3.555672e-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 = -1.714929497662583E-01, IMY = -2.767866785381028E-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:
-239.304000 -5.360000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6455  22.0182    1.0  47.0  163.2   8.0494  11.8    0.7	Crab                          
308.1017  40.9598   66.8  57.9  -23.2  -0.2298  -0.2    0.6	Cyg X-3                       
326.2182  38.2015   14.4  51.3  -38.6  -0.8337  -0.8    7.5	Cyg X-2                       
118.1776  52.2226    3.5  40.9  104.5   2.9312   3.3 ------	UNKNOWN                       
 91.1039  33.8570    2.9  40.5  146.0   2.0111   4.0 ------	UNKNOWN                       
 71.6522  80.6977    2.7  23.3   51.0   1.1344   4.2 ------	UNKNOWN                       
277.7115  56.0604    2.8  56.9    6.4   5.5741   4.1 ------	UNKNOWN                       
324.6723  56.6447    2.3  39.2  -18.8   1.6104   5.0 ------	UNKNOWN                       
340.1037  34.2856    3.3  47.2  -53.3   3.7729   3.5 ------	UNKNOWN                       

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

Time interval of the image:
-5.360000 3.660000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6356  22.0076    8.5  47.0  163.2  -0.1487  -1.4    0.4	Crab                          
308.0509  40.9359    4.5  57.9  -23.2   0.6079   2.6    2.9	Cyg X-3                       
326.0041  38.2950    5.5  51.3  -38.4   0.3482   2.1    8.0	Cyg X-2                       
 76.5810  56.7435    0.6  18.0  121.8   0.9301  19.2 ------	UNKNOWN                       
 33.9040  43.4999    2.1  16.4 -117.6   0.2474   5.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
51.996600 962.821800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6341  22.0071    0.3  35.1 -178.0  36.3286  39.6    0.4	Crab                          
194.8543  66.2356    3.1  48.7   41.7  12.6939   3.7 ------	UNKNOWN                       
114.8286  20.6707    3.5  45.7  139.4   8.7845   3.2 ------	UNKNOWN                       
 48.9930  13.5949    2.8  48.0 -129.3  14.3885   4.1 ------	UNKNOWN                       
 31.9798  29.6497    5.8  41.1  -98.5   8.5091   2.0 ------	UNKNOWN                       
357.4774  46.5498    3.3  47.3  -53.4  14.2289   3.5 ------	UNKNOWN