GRB200109A: 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 15:05:44 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger948361
======================================================================

  Trigger: 00948361      Segment: 000

  BAT Trigger Time: 600227200.448   [s; MET]
      Trigger Stop: 600227208.64   [s; MET]
               UTC: 2020-01-09T01:46:16.218040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 307.170901934691   Dec: 53.0032235193214  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.72
     Image Trigger?:     NO
     Rate S/N Ratio:     19.5703857907809  [ if not an image trigger ]
     Image S/N Ratio:    12.72

  Analysis Position:   [ source = BAT ]
    RA: 307.170901934691   Dec: 53.0032235193214  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 307.115141759145   Dec: 52.9890950301936  [deg; J2000]  
        { 20h 28m 27.6s , +52d 59' 20.7" }
         +/- 1.17107677000977 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.461953979689776 [arcmin] (formal 1-sigma fit error)
    SNR: 24.2738847378558
 
  Angular difference between the analysis and refined position is 2.184781 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 112 +/- 32
        Measured from: -31.4479999542236
                   to: 80.5520000457764     [s; relative to TRIGTIME]
     T50: 32 +/- 16
        Measured from: -15.4479999542236
                   to: 16.5520000457764     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.05200004577637     
                   to: 9.05200004577637     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -31.4479999542236     
                   to: 112.552000045776     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.818485   1.150226   0.987526   0.272596
           0.080014   0.082252   0.072051   0.063038 [error]
 Peak      0.025130   0.032785   0.029477  -0.001019
           0.006887   0.007191   0.006239   0.005549 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  144.000  -31.448  112.552
T90   112.000  -31.448   80.552
T50    32.000  -15.448   16.552
Peak    1.000    8.052    9.052
 
 
====== 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      -1.305    -0.136      0.137       -           -               -         1.49e-03     -1.09e-04          1.09e-04      45.470   57
CPL     -1.306    -0.132      0.143     9999.360    -9999.360      -9999.360      1.50e-03     -1.07e-04          5.73e-04      45.500   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      -1.301     -0.364     0.374       -           -               -         5.87e-03     -1.33e-03          1.33e-03      70.310   57
CPL     -0.204     -1.264     2.193       78.757     -28.228       -78.757      2.20e-02     -2.20e-02          2.62e-01      68.820   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   2.29e-07  4.74e-07  7.67e-07  2.79e-06  2.12e-06  4.25e-06   erg/cm2
      90%_error_low -3.18e-08 -3.92e-08 -7.10e-08 -5.43e-07 -1.74e-07 -5.93e-07   erg/cm2
      90%_error_hi   3.32e-08  3.88e-08  7.03e-08  6.33e-07  1.75e-07  6.68e-07   erg/cm2
Peak flux       PL   2.00e-01  2.26e-01  1.84e-01  2.49e-01  7.00e-01  8.58e-01   ph/cm2/s
      90%_error_low -7.34e-02 -5.65e-02 -4.94e-02 -1.12e-01 -1.60e-01 -1.99e-01   ph/cm2/s
      90%_error_hi   8.10e-02  5.54e-02  4.90e-02  1.60e-01  1.60e-01  2.05e-01   ph/cm2/s
 
Fluence        CPL   2.32e-07  4.70e-07  7.61e-07  2.96e-06  2.13e-06  4.08e-06   erg/cm2
      90%_error_low    N/A    -4.76e-08 -8.62e-08 -1.23e-06 -2.36e-07 -9.31e-07   erg/cm2
      90%_error_hi     N/A     5.39e-08  9.61e-08  9.95e-08  2.15e-07  1.28e-06   erg/cm2
Peak flux      CPL   1.69e-01  2.54e-01  1.96e-01  7.98e-02  6.75e-01  6.99e-01   ph/cm2/s
      90%_error_low -8.45e-02 -6.91e-02 -5.82e-02 -7.98e-02 -1.63e-01 -1.81e-01   ph/cm2/s
      90%_error_hi   9.16e-02  7.48e-02  5.86e-02  2.22e-01  1.64e-01  2.77e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  307.1151    52.9891   0.0080    15.2268  -179.9059         3.0567484     24.274 TRIG_00948361                 
 
Foreground time interval of the image:
-31.448  50.653 (delta_t =  82.101 [sec])
Background time interval of the image:
-239.448 -31.448 (delta_t = 208.000 [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  -31.448 sec. to  112.552 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -1.30504     ( -0.136229   0.137286 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30504     ( -0.137286   0.136229 )
Norm@50keV  : 1.49306E-03    ( -0.00010931   0.00010922 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 144 sec: 0.178295 ( -0.013477  0.013522 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.12223e-06 ( -1.73988e-07  1.7536e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -31.448 sec. to  112.552 sec.
 XSPEC: quit
 
 
Photon index: -1.30629     ( -0.132644   0.142683 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30629     ( -0.142683   0.132644 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.49626E-03    ( -0.000109275   0.000570617 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 144 sec: 0.179262 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.13306e-06 ( -2.36254e-07  2.15182e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    8.052 sec. to    9.052 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Photon index: -1.30127     ( -0.364142   0.373948 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.30127     ( -0.373948   0.364142 )
Norm@50keV  : 5.86953E-03    ( -0.00132906   0.00132552 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 0.700427 ( -0.159503  0.159912 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.79896e-08 ( -1.44163e-08  1.47197e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    8.052 sec. to    9.052 sec.
 XSPEC: quit
 
 
Photon index: -0.203971     ( -1.26409   2.19253 )
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.203971     ( -2.19253   1.26409 )
Epeak [keV] : 78.7575      ( -28.2282 -78.7575 )
Norm@50keV  : 2.19539E-02    ( -0.0219538   0.261604 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec: 0.674839 ( -0.16324  0.16394 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.27036e-08 ( -1.52908e-08  1.64285e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 112.0 sec.
Hardness ratio (energy fluence ratio) = 1.61889963481

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

S(15-50 keV)  = 7.024551e-07
S(50-150 keV) = 1.4198101e-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 = -2.721954509414319E-01, IMY = 4.470945750418586E-04

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:
-239.448000 -31.448000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4644  35.3360  404.5  25.8  -17.9   0.0066   0.0    0.5	Her X-1                       
299.6511  35.1615    3.4  21.3 -120.8   0.9424   3.4    3.8	Cyg X-1                       
308.0308  41.1017    6.2  21.0 -145.5  -0.4177  -1.9    9.6	Cyg X-3                       
326.2176  38.1773   41.9  33.6 -160.5   0.0838   0.3    8.9	Cyg X-2                       
 40.0314  81.4553    2.3  42.2  113.7   4.7675   4.9 ------	UNKNOWN                       
235.4964  20.3405    2.1  47.9  -11.4   2.3405   5.4 ------	UNKNOWN                       
277.8106  10.3284    3.1  42.2  -71.6   3.8372   3.7 ------	UNKNOWN                       

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

Time interval of the image:
-31.448000 50.652600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6980  35.3037   81.6  25.7  -18.3   0.0207   0.1   12.0	Her X-1                       
299.5734  35.3336    9.2  21.2 -120.9   0.1993   1.3    8.0	Cyg X-1                       
308.1433  41.0942   16.8  21.1 -145.6   0.0947   0.7    8.6	Cyg X-3                       
325.9260  38.2450    0.0  33.4 -160.3   0.1520   1.0   12.4	Cyg X-2                       
307.1151  52.9891    0.5  15.2 -179.9   3.0568  24.2 ------	UNKNOWN                       
237.3201  11.8851    2.6  53.9  -19.4   1.9711   4.5 ------	UNKNOWN                       
328.1570  15.0088    2.2  52.2 -139.6   3.5139   5.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
89.252590 962.593700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4644  35.3502   68.1  40.6  -20.4  -0.1868  -0.2    0.6	Her X-1                       
299.5628  35.1686    2.4  18.6  -86.6   4.7188   4.8    2.4	Cyg X-1                       
308.1928  41.0200    4.7  12.0 -110.1   1.9887   2.4    5.5	Cyg X-3                       
326.1256  38.4029    3.6  19.6 -155.7   2.4574   3.2    5.3	Cyg X-2                       
 41.0307  74.7226    3.9  40.6   97.5   8.5783   3.0 ------	UNKNOWN                       
230.2918  35.6158    4.0  54.8   -1.9   7.7537   2.9 ------	UNKNOWN                       
354.1965  11.9970    2.9  55.5 -166.7  10.4748   4.0 ------	UNKNOWN