GRB200903A: 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 v2.48
    Process Start Time: Wed Oct 19 23:51:15 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger994389
======================================================================

  Trigger: 00994389      Segment: 000

  BAT Trigger Time: 620786688   [s; MET]
      Trigger Stop: 620786689.024   [s; MET]
               UTC: 2020-09-03T00:44:22.432080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 164.311253143984   Dec: 50.500692051524  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    17.74
     Image Trigger?:     NO
     Rate S/N Ratio:     43.7264222181509  [ if not an image trigger ]
     Image S/N Ratio:    17.74

  Analysis Position:   [ source = BAT ]
    RA: 164.311253143984   Dec: 50.500692051524  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 164.312289776971   Dec: 50.4872607263471  [deg; J2000]  
        { 10h 57m 14.9s , +50d 29' 14.1" }
         +/- 0.759752937229253 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.35870962603962 [arcmin] (formal 1-sigma fit error)
    SNR: 45.0387571380637
 
  Angular difference between the analysis and refined position is 0.806850 arcmin
 
  Partial Coding Fraction: 0.6796875    [ including projection effects ]

  Duration
     T90: 22.9119999408722 +/- 7.35864474962099
        Measured from: -15.5520000457764
                   to: 7.35999989509583     [s; relative to TRIGTIME]
     T50: 5.54799997806549 +/- 0.687825536536594
        Measured from: -1.55200004577637
                   to: 3.99599993228912     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.144000053405762     
                   to: 1.14400005340576     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -19.1759999990463     
                   to: 10.87600004673     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.184777   1.703103   1.300645   0.196270
           0.045353   0.048389   0.043012   0.036242 [error]
 Peak      0.112691   0.167656   0.144286   0.025022
           0.009459   0.011187   0.010149   0.007278 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   30.052  -19.176   10.876
T90    22.912  -15.552    7.360
T50     5.548   -1.552    3.996
Peak    1.000    0.144    1.144
 
 
====== 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      -1.550    -0.063      0.062       -           -               -         1.01e-02     -3.51e-04          3.51e-04      63.650   57
CPL     -1.040    -0.256      0.272       97.097     -17.364        45.121      1.79e-02     -4.34e-03          6.16e-03      51.390   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      -1.387     -0.116     0.115       -           -               -         3.08e-02     -2.22e-03          2.21e-03      58.060   57
CPL     -0.638     -0.477     0.535       94.622     -20.558        72.844      7.19e-02     -2.95e-02          5.77e-02      50.460   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   4.06e-07  7.24e-07  9.88e-07  2.79e-06  2.86e-06  4.91e-06   erg/cm2
      90%_error_low -2.53e-08 -2.70e-08 -4.42e-08 -2.65e-07 -1.06e-07 -2.97e-07   erg/cm2
      90%_error_hi   2.58e-08  2.70e-08  4.41e-08  2.83e-07  1.07e-07  3.11e-07   erg/cm2
Peak flux       PL   1.14e+00  1.22e+00  9.35e-01  1.17e+00  3.73e+00  4.46e+00   ph/cm2/s
      90%_error_low -1.35e-01 -9.39e-02 -8.18e-02 -1.93e-01 -2.69e-01 -3.27e-01   ph/cm2/s
      90%_error_hi   1.39e-01  9.34e-02  8.12e-02  2.14e-01  2.69e-01  3.29e-01   ph/cm2/s
 
Fluence        CPL   3.66e-07  7.53e-07  1.02e-06  1.41e-06  2.75e-06  3.55e-06   erg/cm2
      90%_error_low -3.12e-08 -3.12e-08 -4.86e-08 -3.73e-07 -1.19e-07 -3.89e-07   erg/cm2
      90%_error_hi   3.17e-08  3.15e-08  4.90e-08  5.39e-07  1.19e-07  5.44e-07   erg/cm2
Peak flux      CPL   9.84e-01  1.31e+00  1.01e+00  5.72e-01  3.65e+00  3.88e+00   ph/cm2/s
      90%_error_low -1.62e-01 -1.11e-01 -9.69e-02 -2.02e-01 -2.75e-01 -3.47e-01   ph/cm2/s
      90%_error_hi   1.66e-01  1.14e-01  9.88e-02  3.20e-01  2.75e-01  4.00e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  164.3123    50.4873   0.0043    26.7965   -45.3375         4.5626258     45.039 TRIG_00994389                 
 
Foreground time interval of the image:
-19.176  10.876 (delta_t =  30.052 [sec])
Background time interval of the image:
-239.000 -19.176 (delta_t = 219.824 [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  -19.176 sec. to   10.876 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.5504     ( -0.0626394   0.0624645 )
Norm@50keV  : 1.00950E-02    ( -0.000351434   0.000351111 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.65     using 59 bins.
 Reduced chi-squared = 1.11667
# Null hypothesis probability of 2.54e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 30.05 sec: 1.27815 ( -0.04652  0.0466 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85604e-06 ( -1.06474e-07  1.06772e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -19.176 sec. to   10.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.04006     ( -0.256043   0.271785 )
Epeak [keV] : 97.0968      ( -17.3636 45.1216 )
Norm@50keV  : 1.78597E-02    ( -0.00434387   0.0061554 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.39     using 59 bins.
 Reduced chi-squared = 0.917679
# Null hypothesis probability of 6.50e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 30.05 sec: 1.23822 ( -0.05015  0.05025 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.74843e-06 ( -1.19286e-07  1.19209e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.144 sec. to    1.144 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38699     ( -0.115986   0.115131 )
Norm@50keV  : 3.07570E-02    ( -0.00221539   0.00221109 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.06     using 59 bins.
 Reduced chi-squared = 1.0186
# Null hypothesis probability of 4.36e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.73478 ( -0.26884  0.269 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.9803e-07 ( -2.36895e-08  2.38396e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.144 sec. to    1.144 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.638475     ( -0.477403   0.535187 )
Epeak [keV] : 94.6219      ( -20.5581 72.8445 )
Norm@50keV  : 7.19407E-02    ( -0.0295031   0.0577259 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.46     using 59 bins.
 Reduced chi-squared = 0.901071
# Null hypothesis probability of 6.84e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 3.65006 ( -0.27467  0.27458 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.86952e-07 ( -2.50433e-08  2.51309e-08 ) 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 = 3.550219012562849E-01, IMY = 3.592294551720819E-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:
-239.000000 -19.176000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4502  35.2344    3.6  36.9  135.7   1.7203   3.2    6.5	Her X-1                       
256.5523  22.4676    3.0  47.8  145.9   4.2275   3.8 ------	UNKNOWN                       
106.7935  58.6393    2.8  51.0   -6.9   2.1534   4.2 ------	UNKNOWN                       
107.7589  50.4990    3.3  56.3  -14.7   3.3691   3.5 ------	UNKNOWN                       

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

Time interval of the image:
-19.176000 10.876000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3048  35.4572    3.9  36.6  135.6   0.4979   2.9   10.2	Her X-1                       
164.3123  50.4873    0.3  26.8  -45.3   4.5614  45.0 ------	UNKNOWN                       
162.7418  40.3953    1.9  33.2  -61.2   0.8298   5.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
172.100590 853.200600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9711 -15.6495    0.8  40.1  -52.5  21.3602  15.0    0.7	Sco X-1                       
255.7963 -37.8590  137.2  22.0  -85.2   0.0685   0.1    9.1	4U 1700-377                   
256.4561 -36.4257    8.3  21.7  -81.2   1.0910   1.4    1.0	GX 349+2                      
263.0142 -24.7482    5.6  21.2  -45.3   1.5068   2.1    0.3	GX 1+4                        
264.7448 -44.4409  169.3  16.2 -108.2  -0.0480  -0.1    0.6	4U 1735-44                    
268.2468  -1.4484   10.0  37.9   -9.1   1.0961   1.1    7.3	SW J1753.5-0127               
270.3409 -25.0996    2.3  16.2  -31.7   3.1925   5.1    3.3	GX 5-1                        
270.3105 -25.6903    2.3  15.7  -33.2   3.4733   5.5    3.2	GRS 1758-258                  
274.0300 -14.0873    6.2  24.1   -6.8   1.3215   1.9    3.4	GX 17+2                       
275.7977 -30.2938    5.5   9.1  -31.3   1.4229   2.1    7.9	H1820-303                     
284.8310 -24.8200    0.0  11.9   22.0   0.3707   0.6   12.7	HT1900.1-2455                 
288.7129  10.8787  446.7  47.8   23.2  -0.0440  -0.0    6.4	GRS 1915+105                  
262.9524 -33.6927   19.8  17.1  -69.7   0.4328   0.6    8.7	GX 354-0                      
324.1951 -28.2280    4.1  35.0  104.4   4.3900   2.8 ------	UNKNOWN                       
 17.6941 -71.3262    3.0  56.8  173.9  15.9924   3.9 ------	UNKNOWN                       
260.3880  13.8096    3.8  55.0  -11.5   5.4792   3.0 ------	UNKNOWN                       
255.0836 -41.5595    2.2  22.5  -95.0   4.3416   5.4 ------	UNKNOWN