GRB180204A: 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: Fri Mar  2 11:39:47 EST 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger808483
======================================================================

  Trigger: 00808483      Segment: 000

  BAT Trigger Time: 539404597.364   [s; MET]
      Trigger Stop: 539404597.428   [s; MET]
               UTC: 2018-02-04T02:36:16.941560    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 330.117715108731   Dec: 30.8457546126038  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.65
     Image Trigger?:     NO
     Rate S/N Ratio:     63.4980314655502  [ if not an image trigger ]
     Image S/N Ratio:    7.65

  Analysis Position:   [ source = BAT ]
    RA: 330.117715108731   Dec: 30.8457546126038  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 330.122955016376   Dec: 30.8516111086827  [deg; J2000]  
        { 22h 00m 29.5s , +30d 51' 05.8" }
         +/- 1.07298284209121 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.369505321466016 [arcmin] (formal 1-sigma fit error)
    SNR: 27.5051749982647
 
  Angular difference between the analysis and refined position is 0.443090 arcmin
 
  Partial Coding Fraction: 0.703125    [ including projection effects ]

  Duration
     T90: 1.16400003433228 +/- 0.117098175136296
        Measured from: -0.0279999971389771
                   to: 1.1360000371933     [s; relative to TRIGTIME]
     T50: 0.916000008583069 +/- 0.0233238344023471
        Measured from: 0.0720000267028809
                   to: 0.98800003528595     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0519999265670776     
                   to: 0.948000073432922     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0519999265670776     
                   to: 1.29200005531311     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.115541   0.228384   0.237098   0.079770
           0.010285   0.012500   0.012442   0.009893 [error]
 Peak      0.073491   0.151389   0.171449   0.061361
           0.008592   0.010626   0.010821   0.008998 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    1.344   -0.052    1.292
T90     1.164   -0.028    1.136
T50     0.916    0.072    0.988
Peak    1.000   -0.052    0.948
 
 
====== 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      -1.088    -0.096      0.097       -           -               -         3.40e-02     -1.93e-03          1.93e-03      71.080   57
CPL     -0.762    -0.353      0.412      212.272     -88.403      -212.272      4.81e-02     -1.48e-02          2.55e-02      68.910   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      -0.973     -0.119     0.122       -           -               -         3.16e-02     -2.22e-03          2.22e-03      62.660   57
CPL     -0.819     -0.211     0.501      443.772    -443.772      -443.772      3.71e-02     -7.09e-03          2.40e-02      62.340   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   3.97e-08  9.40e-08  1.77e-07  8.05e-07  4.79e-07  1.12e-06   erg/cm2
      90%_error_low -4.32e-09 -6.31e-09 -1.14e-08 -1.10e-07 -2.96e-08 -1.18e-07   erg/cm2
      90%_error_hi   4.47e-09  6.26e-09  1.14e-08  1.22e-07  2.97e-08  1.27e-07   erg/cm2
Peak flux       PL   7.87e-01  1.09e+00  1.11e+00  2.05e+00  3.64e+00  5.03e+00   ph/cm2/s
      90%_error_low -1.11e-01 -9.59e-02 -8.31e-02 -3.15e-01 -2.59e-01 -3.84e-01   ph/cm2/s
      90%_error_hi   1.16e-01  9.48e-02  8.26e-02  3.50e-01  2.59e-01  3.93e-01   ph/cm2/s
 
Fluence        CPL   3.70e-08  9.67e-08  1.83e-07  5.21e-07  4.73e-07  8.38e-07   erg/cm2
      90%_error_low -5.27e-09 -7.11e-09 -1.37e-08 -1.97e-07 -3.12e-08 -1.95e-07   erg/cm2
      90%_error_hi   5.41e-09  7.24e-09  1.39e-08  3.19e-07  3.10e-08  2.75e-07   erg/cm2
Peak flux      CPL   7.57e-01  1.10e+00  1.13e+00  1.75e+00  3.62e+00  4.73e+00   ph/cm2/s
      90%_error_low -1.40e-01 -9.17e-02 -5.33e-02 -6.50e-01 -2.60e-01 -7.01e-01   ph/cm2/s
      90%_error_hi   7.22e-02  1.03e-01  1.07e-01  3.82e-01  2.64e-01  5.13e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  330.1230    30.8516   0.0070    36.8234    -6.8561         0.6777314     27.505 TRIG_00808483                 
 
Foreground time interval of the image:
 -0.052   1.292 (delta_t =   1.344 [sec])
Background time interval of the image:
-130.463  -0.052 (delta_t = 130.411 [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   -0.052 sec. to    1.292 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.08831     ( -0.0957157   0.0967587 )
Norm@50keV  : 3.39869E-02    ( -0.0019332   0.00193108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.08 using 59 PHA bins.
# Reduced chi-squared =          1.247 for     57 degrees of freedom 
# Null hypothesis probability =   9.938810e-02
 
Photon flux (15-150 keV)    in 1.344 sec: 3.93790 ( -0.22992  0.23014 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.79424e-07 ( -2.95927e-08  2.96953e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.052 sec. to    1.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.761658     ( -0.352803   0.412372 )
Epeak [keV] : 212.272      ( -88.4079 -212.277 )
Norm@50keV  : 4.81155E-02    ( -0.0148003   0.0254591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.91 using 59 PHA bins.
# Reduced chi-squared =          1.231 for     56 degrees of freedom 
# Null hypothesis probability =   1.152113e-01
 
Photon flux (15-150 keV)    in 1.344 sec: 3.89744 ( -0.2347  0.23476 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.72562e-07 ( -3.12266e-08  3.10184e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.052 sec. to    0.948 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.973211     ( -0.119429   0.121654 )
Norm@50keV  : 3.16207E-02    ( -0.00222267   0.00221696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.66 using 59 PHA bins.
# Reduced chi-squared =          1.099 for     57 degrees of freedom 
# Null hypothesis probability =   2.823572e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.63587 ( -0.25889  0.25918 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.45271e-07 ( -2.60511e-08  2.6153e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.052 sec. to    0.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.818953     ( -0.21126   0.501082 )
Epeak [keV] : 443.772      ( -443.784 -443.784 )
Norm@50keV  : 3.70701E-02    ( -0.00708918   0.0239556 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.34 using 59 PHA bins.
# Reduced chi-squared =          1.113 for     56 degrees of freedom 
# Null hypothesis probability =   2.609081e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.61895 ( -0.26021  0.26385 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.43329e-07 ( -2.70066e-08  2.68314e-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 = 7.433797608717032E-01, IMY = 8.938082735669804E-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:
-130.463410 -0.052000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0926  40.8672   48.0  57.2   -4.7  -0.1604  -0.2    5.2	Cyg X-3                       
326.0813  38.4729    4.4  43.7    0.4  -0.6091  -2.6   10.0	Cyg X-2                       
 44.3196 -11.3443    2.6  46.9  156.3   1.8960   4.5 ------	UNKNOWN                       

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

Time interval of the image:
-0.052000 1.292000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0985  40.8749    9.8  57.2   -4.7  -0.1057  -1.2    4.7	Cyg X-3                       
326.0906  38.4925    8.7  43.7    0.5  -0.0393  -1.3   10.9	Cyg X-2                       
328.3313  38.0422    2.2  42.0    1.4   0.1355   5.2 ------	UNKNOWN                       
330.1230  30.8516    0.4  36.8   -6.9   0.6777  27.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
70.736590 671.336590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.6626  10.9161    7.7  43.2  -34.1   1.3436   1.5    8.2	GRS 1915+105                  
299.5855  35.2052    0.3  25.9    2.2  20.1473  38.0    0.3	Cyg X-1                       
308.2543  40.9829    2.1  20.3   20.2   2.8003   5.5    6.8	Cyg X-3                       
326.3099  38.1914    7.9   8.0   52.3   0.6261   1.5   10.2	Cyg X-2                       
319.3738  41.4060    2.9  13.7   38.0   1.8698   4.0 ------	UNKNOWN                       
294.7082   8.5364    2.4  39.8  -42.3   4.2616   4.8 ------	UNKNOWN                       
359.7108 -10.3192    2.9  50.0 -145.2   6.1905   3.9 ------	UNKNOWN                       
321.4433  -9.1062    3.8  40.8  -92.6   7.6300   3.0 ------	UNKNOWN