GRB190203A: 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: Sun Mar 17 22:32:51 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger887512
======================================================================

  Trigger: 00887512      Segment: 000

  BAT Trigger Time: 570901470.784   [s; MET]
      Trigger Stop: 570901474.88   [s; MET]
               UTC: 2019-02-03T15:44:08.426720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 22.5767302168316   Dec: 55.7384085258687  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.89
     Image Trigger?:     NO
     Rate S/N Ratio:     40  [ if not an image trigger ]
     Image S/N Ratio:    7.89

  Analysis Position:   [ source = BAT ]
    RA: 22.5767302168316   Dec: 55.7384085258687  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 22.6030183946477   Dec: 55.7365818867749  [deg; J2000]  
        { 01h 30m 24.7s , +55d 44' 11.7" }
         +/- 0.930678953476845 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.335172611697705 [arcmin] (formal 1-sigma fit error)
    SNR: 33.7046608674537
 
  Angular difference between the analysis and refined position is 0.894729 arcmin
 
  Partial Coding Fraction: 0.2167969    [ including projection effects ]

  Duration
     T90: 86.5600000619888 +/- 64.5798710100376
        Measured from: -48.6000000238419
                   to: 37.960000038147     [s; relative to TRIGTIME]
     T50: 33.8559999465942 +/- 2.72380910725493
        Measured from: -23.2879999876022
                   to: 10.567999958992     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -4.08399999141693     
                   to: -3.08399999141693     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -56.472000002861     
                   to: 229.959999918938     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.896826   6.600239   7.191544   3.360588
           0.202493   0.219953   0.204673   0.173606 [error]
 Peak      0.056728   0.193250   0.220398   0.113286
           0.019105   0.023313   0.023973   0.018696 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  286.432  -56.472  229.960
T90    86.560  -48.600   37.960
T50    33.856  -23.288   10.568
Peak    1.000   -4.084   -3.084
 
 
====== 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      -1.125    -0.061      0.061       -           -               -         5.26e-03     -1.81e-04          1.80e-04      61.150   57
CPL     -1.124    -0.057      0.069     9999.360    -9999.360      -9999.360      5.28e-03     -1.65e-04          6.55e-04      61.260   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      -0.933     -0.215     0.223       -           -               -         3.87e-02     -5.19e-03          5.12e-03      38.730   57
CPL     -0.629     -0.488     0.947      291.553    -291.553      -291.553      5.11e-02     -1.67e-02          6.36e-02      38.320   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   1.36e-06  3.14e-06  5.75e-06  2.52e-05  1.56e-05  3.55e-05   erg/cm2
      90%_error_low -1.01e-07 -1.40e-07 -1.99e-07 -2.02e-06 -5.20e-07 -2.08e-06   erg/cm2
      90%_error_hi   1.04e-07  1.39e-07  1.98e-07  2.14e-06  5.20e-07  2.18e-06   erg/cm2
Peak flux       PL   2.44e-04  2.99e-03  3.18e-02  3.04e+00  1.54e-01  3.10e+00   ph/cm2/s
      90%_error_low -3.14e-05 -3.59e-04 -2.02e-03 -4.54e-01 -1.89e-02 -4.80e-01   ph/cm2/s
      90%_error_hi   3.21e-04  3.34e-03  3.26e-02  1.64e+00  1.24e-01  1.65e+00   ph/cm2/s
 
Fluence        CPL   1.35e-06  3.13e-06  5.68e-06  2.61e-05  1.57e-05  3.56e-05   erg/cm2
      90%_error_low    N/A    -1.88e-07    N/A       N/A    -5.74e-07 -4.50e-06   erg/cm2
      90%_error_hi     N/A     1.93e-07    N/A       N/A     4.66e-07  7.37e-07   erg/cm2
Peak flux      CPL   5.13e-02  1.06e-01  4.89e-02  4.69e-02  3.28e-01  4.03e-01   ph/cm2/s
      90%_error_low -5.13e-02 -1.06e-01 -4.89e-02 -4.69e-02 -3.28e-01 -4.03e-01   ph/cm2/s
      90%_error_hi   -3.47e-02  -9.76e-02  -4.34e-02  -3.72e-02  -3.03e-01  -3.63e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   22.6030    55.7366   0.0057    49.3341    13.2805        20.6319892     33.705 TRIG_00887512                 
 
Foreground time interval of the image:
-56.472  37.517 (delta_t =  93.989 [sec])
Background time interval of the image:
-239.784 -56.472 (delta_t = 183.312 [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  -56.472 sec. to  229.960 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12509     ( -0.0606083   0.0612853 )
Norm@50keV  : 5.26232E-03    ( -0.000181201   0.000180484 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.15 using 59 PHA bins.
# Reduced chi-squared =          1.073 for     57 degrees of freedom 
# Null hypothesis probability =   3.292939e-01
 
Photon flux (15-150 keV)    in 286.4 sec: 0.611964 ( -0.022606  0.022756 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56352e-05 ( -5.19661e-07  5.20048e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -56.472 sec. to  229.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12377     ( -0.0580065   0.0676704 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 5.28440E-03    ( -0.000172562   0.000646778 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.26 using 59 PHA bins.
# Reduced chi-squared =          1.094 for     56 degrees of freedom 
# Null hypothesis probability =   2.929506e-01
 
Photon flux (15-150 keV)    in 286.4 sec: 0.616790 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.56868e-05 ( -5.74026e-07  4.65864e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -4.084 sec. to   -3.084 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.933374     ( -0.214783   0.222595 )
Norm@50keV  : 3.86648E-02    ( -0.00519359   0.0051176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.73 using 59 PHA bins.
# Reduced chi-squared =         0.6794 for     57 degrees of freedom 
# Null hypothesis probability =   9.695584e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.154033 ( -0.01891  0.123661 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.2847e-07 ( -5.56837e-08  5.57247e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -4.084 sec. to   -3.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.629182     ( -0.488396   0.947092 )
Epeak [keV] : 291.553      ( -291.553 -291.553 )
Norm@50keV  : 5.10521E-02    ( -0.0167197   0.0635603 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.32 using 59 PHA bins.
# Reduced chi-squared =         0.6843 for     56 degrees of freedom 
# Null hypothesis probability =   9.658834e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.328211 ( -0.328211  -0.302782 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.28046e-07 ( -5.63225e-08  5.6171e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 86.56 sec.
Hardness ratio (energy fluence ratio) = 1.83391783639

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

S(15-50 keV)  = 4.493465e-06
S(50-150 keV) = 1.1141719e-05

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 = 1.132877569568501E+00, IMY = -2.673935363469832E-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:
-239.784000 -56.472000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 50.1428 -43.0455    2.0  53.3  178.6   4.0746   5.7 ------	UNKNOWN                       
  7.3223  52.8801    2.7  49.5    1.0   1.7468   4.3 ------	UNKNOWN                       
355.7140  57.3966    3.0  56.9   -2.7   3.1758   3.9 ------	UNKNOWN                       

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

Time interval of the image:
-56.472000 37.516600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 68.1471 -24.8741    2.1  49.6  148.9   3.6639   5.5 ------	UNKNOWN                       
 22.6030  55.7366    0.3  49.3   13.3  20.6319  33.7 ------	UNKNOWN                       
 33.5522 -51.1261    3.3  57.9 -165.6   3.3548   3.5 ------	UNKNOWN                       
356.1493 -23.4141    2.4  43.8 -116.4   3.5158   4.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
102.316600 712.876400
720.216000 789.916600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
307.9163  41.0438   19.7  49.1  -44.9   1.7023   0.6   10.3	Cyg X-3                       
326.2783  38.3676    9.1  40.7  -61.5   2.1520   1.3    5.7	Cyg X-2                       
 84.3187  43.0823    3.0  40.6  110.6   8.0812   3.9 ------	UNKNOWN                       
 40.8925  61.4093    1.2  11.1   81.0   4.7926   9.4 ------	UNKNOWN                       
 43.8656  17.7400    2.5  41.3  177.7   4.2723   4.6 ------	UNKNOWN                       
 35.2654   1.8026    3.2  54.9 -166.3   6.4061   3.6 ------	UNKNOWN                       
335.6743  32.1729    3.3  40.0  -76.7   6.8556   3.5 ------	UNKNOWN                       
344.2517  25.7622    4.8  40.8  -91.9   6.4061   2.4 ------	UNKNOWN                       
  6.5231   9.3798    2.7  48.0 -129.2  11.2839   4.2 ------	UNKNOWN