GRB200303A: 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 v2.47
    Process Start Time: Mon May 18 14:33:00 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger959431
======================================================================

  Trigger: 00959431      Segment: 000

  BAT Trigger Time: 604895721.984   [s; MET]
      Trigger Stop: 604895723.008   [s; MET]
               UTC: 2020-03-03T02:34:57.451340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 212.69767656104   Dec: 51.3598967093526  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.7
     Image Trigger?:     NO
     Rate S/N Ratio:     34.322004603461  [ if not an image trigger ]
     Image S/N Ratio:    14.7

  Analysis Position:   [ source = BAT ]
    RA: 212.69767656104   Dec: 51.3598967093526  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 212.69658988338   Dec: 51.3593029246216  [deg; J2000]  
        { 14h 10m 47.2s , +51d 21' 33.5" }
         +/- 0.761326081255073 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.293855203308316 [arcmin] (formal 1-sigma fit error)
    SNR: 44.9058667045297
 
  Angular difference between the analysis and refined position is 0.054100 arcmin
 
  Partial Coding Fraction: 0.59375    [ including projection effects ]

  Duration
     T90: 94.2199999094009 +/- 6.39572365248616
        Measured from: -30.3439999818802
                   to: 63.8759999275208     [s; relative to TRIGTIME]
     T50: 28.7559999227524 +/- 1.24452078500068
        Measured from: -11.0799999237061
                   to: 17.6759999990463     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.340000033378601     
                   to: 1.3400000333786     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -36.5479999780655     
                   to: 193.259999990463     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     6.308552   8.079909   5.898790   1.447444
           0.112095   0.115383   0.100965   0.083117 [error]
 Peak      0.158947   0.240725   0.162538   0.042613
           0.011605   0.012577   0.011352   0.008267 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  229.808  -36.548  193.260
T90    94.220  -30.344   63.876
T50    28.756  -11.080   17.676
Peak    1.000    0.340    1.340
 
 
====== 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      -1.640    -0.039      0.039       -           -               -         6.19e-03     -1.25e-04          1.25e-04      52.350   57
CPL     -1.400    -0.163      0.169      140.140     -35.389       162.725      7.92e-03     -1.19e-03          1.46e-03      45.950   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -1.590     -0.106     0.105       -           -               -         3.95e-02     -2.56e-03          2.55e-03      69.700   57
CPL     -0.818     -0.467     0.525       75.118     -13.640        41.126      9.84e-02     -4.11e-02          8.32e-02      61.210   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   2.07e-06  3.50e-06  4.49e-06  1.16e-05  1.32e-05  2.16e-05   erg/cm2
      90%_error_low -8.73e-08 -8.49e-08 -1.10e-07 -6.49e-07 -2.73e-07 -7.00e-07   erg/cm2
      90%_error_hi   8.89e-08  8.48e-08  1.10e-07  6.75e-07  2.73e-07  7.18e-07   erg/cm2
Peak flux       PL   1.77e+00  1.69e+00  1.12e+00  1.16e+00  5.06e+00  5.74e+00   ph/cm2/s
      90%_error_low -1.81e-01 -1.11e-01 -9.13e-02 -1.78e-01 -3.22e-01 -3.60e-01   ph/cm2/s
      90%_error_hi   1.86e-01  1.11e-01  9.08e-02  1.96e-01  3.22e-01  3.61e-01   ph/cm2/s
 
Fluence        CPL   2.09e-06  2.78e-06  2.89e-06  6.67e-06  9.52e-06  1.42e-05   erg/cm2
      90%_error_low -6.03e-08 -1.53e-07 -1.12e-07 -3.12e-07 -4.81e-07 -5.74e-07   erg/cm2
      90%_error_hi   4.92e-08  1.45e-07  1.24e-07  1.38e-05  5.17e-07  6.03e-07   erg/cm2
Peak flux      CPL   1.55e+00  1.82e+00  1.19e+00  5.29e-01  4.90e+00  5.09e+00   ph/cm2/s
      90%_error_low -2.17e-01 -1.37e-01 -1.04e-01 -1.95e-01 -3.34e-01 -3.96e-01   ph/cm2/s
      90%_error_hi   2.22e-01  1.40e-01  1.06e-01  3.07e-01  3.34e-01  4.38e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  212.6966    51.3593   0.0043    35.1794   172.1574        15.8571436     44.906 TRIG_00959431                 
 
Foreground time interval of the image:
-36.548  17.317 (delta_t =  53.865 [sec])
Background time interval of the image:
-45.883 -36.548 (delta_t =   9.335 [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  -36.548 sec. to  193.260 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -1.6403     ( -0.0394134   0.0393778 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.64030     ( -0.0393778   0.0394134 )
Norm@50keV  : 6.19154E-03    ( -0.000125436   0.000125435 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 229.8 sec: 0.805925 ( -0.019414  0.019506 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32477e-05 ( -2.72913e-07  2.73032e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -36.548 sec. to  193.260 sec.
 XSPEC: quit
 
 
Photon index: -1.39965     ( -0.163038   0.168927 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.39965     ( -0.168927   0.163038 )
Epeak [keV] : 140.140      ( -35.389 162.725 )
Norm@50keV  : 7.92309E-03    ( -0.0011924   0.00145901 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 229.8 sec: 0.788283 ( -0.022352  0.022525 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.5159e-06 ( -4.81279e-07  5.16616e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.340 sec. to    1.340 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -1.59011     ( -0.106134   0.104727 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59011     ( -0.104727   0.106134 )
Norm@50keV  : 3.94596E-02    ( -0.00256172   0.00255101 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 5.05549 ( -0.32202  0.32236 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.6953e-07 ( -2.56396e-08  2.58002e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.340 sec. to    1.340 sec.
 XSPEC: quit
 
 
Photon index: -0.817689     ( -0.466784   0.524796 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.817689     ( -0.524796   0.466784 )
Epeak [keV] : 75.1178      ( -13.6404 41.1262 )
Norm@50keV  : 9.83729E-02    ( -0.0410755   0.0831656 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 4.90460 ( -0.33435  0.33439 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.50776e-07 ( -2.82981e-08  2.83469e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 94.22 sec.
Hardness ratio (energy fluence ratio) = 1.28321659121

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

S(15-50 keV)  = 5.569027e-06
S(50-150 keV) = 7.678723e-06

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 = -6.982902621321470E-01, IMY = -9.618305414184913E-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:
-45.883370 -36.548000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0291 -15.5790    1.7  39.2  -30.5   0.3835   7.0    4.7	Sco X-1                       
254.3941  35.3650   11.7  32.9 -125.7  -0.0517  -1.0    3.4	Her X-1                       
193.8261  37.4368    2.4  32.9  137.5   0.2607   4.9 ------	UNKNOWN                       
183.1153  65.3695    2.5  55.0  164.5   0.8830   4.6 ------	UNKNOWN                       
216.0037 -33.2557    2.2  51.0   11.7   0.5106   5.2 ------	UNKNOWN                       

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

Time interval of the image:
-36.548000 17.316600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.8468 -15.6713    8.4  39.1  -30.2   0.5544   1.4    7.9	Sco X-1                       
254.3897  35.3159    6.8  32.9 -125.6   0.6549   1.7    3.7	Her X-1                       
185.7518   2.7554    2.8  39.7   76.6   4.0095   4.1 ------	UNKNOWN                       
212.6966  51.3593    0.3  35.2  172.2  15.8585  44.9 ------	UNKNOWN                       
221.6695  61.1167    2.3  43.9 -177.4   2.2164   4.9 ------	UNKNOWN                       
247.3908 -32.6163    2.5  54.9  -21.0   3.9744   4.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
76.716590 962.026100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6352  35.4220    6.9  33.8  -47.4  -1.5893  -1.7    9.9	Her X-1                       
 80.5790  65.0692    2.8  57.9 -170.7  13.9949   4.1 ------	UNKNOWN                       
244.7070  22.3653    3.1  38.1  -21.6   3.2860   3.7 ------	UNKNOWN                       
257.7847   5.7097    3.6  58.9  -24.4  13.2494   3.2 ------	UNKNOWN                       
263.1972  19.4625    3.4  50.6  -39.3   9.1368   3.3 ------	UNKNOWN                       
329.4117  73.5239    2.3  48.0 -129.1  14.5896   5.0 ------	UNKNOWN