batgrbproduct analysis for trigger=882809

batgrbproduct Analysis for Trigger=882809

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 (local time): Sun Mar 17 22:53:57 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger882809
======================================================================

  Trigger: 00882809      Segment: 000

  BAT Trigger Time: 568727791.424   [s; MET]
      Trigger Stop: 568727792.448   [s; MET]
               UTC: 2019-01-09T11:56:09.203160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 55.5953879141201   Dec: 63.5778852049672  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.64
     Image Trigger?:     NO
     Rate S/N Ratio:     15.0332963783729  [ if not an image trigger ]
     Image S/N Ratio:    8.64

  Flight Position:   [ source = BAT ]
    RA: 55.5953879141201   Dec: 63.5778852049672  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 55.5531692571662   Dec: 63.595502333732  [deg; J2000]  
        { 03h 42m 12.8s , +63d 35' 43.8" }
         +/- 1.42340065785624 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.558298739749023 [arcmin] (formal 1-sigma fit error)
    SNR: 18.3687488754915
 
  Angular difference between Flight and Ground position is 1.545017 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 6.51199996471405 +/- 0.79070601675249
        Measured from: -3.56000006198883
                   to: 2.95199990272522     [s; relative to TRIGTIME]
     T50: 2.81599986553192 +/- 0.862229655679745
        Measured from: -1.19599997997284
                   to: 1.61999988555908     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.124000072479248     
                   to: 0.875999927520752     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.25999999046326     
                   to: 3.30799996852875     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.228417   0.280549   0.213941   0.054848
           0.023925   0.024257   0.020550   0.016799 [error]
 Peak      0.056678   0.068414   0.060676   0.010642
           0.009377   0.009620   0.008211   0.006128 [error]

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

======================================================================
 
=== 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   Power-law 7.09e-08 1.23e-07 1.63e-07 4.43e-07 4.78e-07 8.02e-07   erg/cm2
              Error 1.07e-08 1.15e-08 2.03e-08 1.16e-07 4.88e-08 1.33e-07   erg/cm2
Peak flux Power-law 5.58e-01 5.56e-01 3.89e-01 4.31e-01 1.67e+00 1.93e+00   ph/cm2/s
              Error 1.27e-01 8.03e-02 6.69e-02 1.49e-01 2.32e-01 2.65e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.71e-08 1.29e-07 1.66e-07 2.48e-07 4.62e-07 6.11e-07   erg/cm2
              Error 1.24e-08 1.47e-08 2.18e-08 1.88e-07 5.45e-08 2.00e-07   erg/cm2
Peak flux Cutoff-PL 5.23e-01 5.79e-01 4.03e-01 2.79e-01 1.65e+00 1.78e+00   ph/cm2/s
              Error 1.46e-01 9.56e-02 7.50e-02 1.87e-01 2.36e-01 3.14e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.591    0.159    -      -           6.73e-03 6.38e-04   65.690 57
CPL   1.217    0.585     101.1  -30.8      1.06e-02 9.15e-03   64.650 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.515    0.229    -      -           1.34e-02 1.86e-03   63.350 57
CPL   1.131    0.706     112.6  -30.3      2.10e-02 2.59e-02   62.700 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 7.232000 sec.
T50 in the 50-300 keV band: 3.328000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    7.568   -4.260    3.308
T90     6.512   -3.560    2.952
T50     2.816   -1.196    1.620
Peak    1.000   -0.124    0.876

Click here for the BAT GCN circular template

Special notes of this burst

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   55.5532    63.5955   0.0105    28.7958    31.2639         0.8041735     18.369 TRIG_00882809                 
 
Foreground time interval of the image:
 -4.260   3.308 (delta_t =   7.568 [sec])
Background time interval of the image:
-239.424  -4.260 (delta_t = 235.164 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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   -4.260 sec. to    3.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59103     ( -0.157829   0.159718 )
Norm@50keV  : 6.73366E-03    ( -0.000640211   0.000635611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.69 using 59 PHA bins.
# Reduced chi-squared =          1.152 for     57 degrees of freedom 
# Null hypothesis probability =   2.011149e-01
 
Photon flux (15-150 keV)    in 7.568 sec: 0.862949 ( -0.079953  0.080062 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.77179e-07 ( -4.85011e-08  4.90213e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.260 sec. to    3.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.21736     ( -0.71624   0.454527 )
Epeak [keV] : 101.068      ( -39.3872 -101.07 )
Norm@50keV  : 1.05521E-02    ( -0.00430543   0.0139967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.65 using 59 PHA bins.
# Reduced chi-squared =          1.154 for     56 degrees of freedom 
# Null hypothesis probability =   2.002077e-01
 
Photon flux (15-150 keV)    in 7.568 sec: 0.849427 ( -0.083486  0.083066 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.62776e-07 ( -5.46158e-08  5.44386e-08 ) ergs/cm2

Band function

Time interval is from   -4.260 sec. to    3.308 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 13.7699  (-1.48427  1.71045)
R^2/D10^2   : 0.129840  (-0.044804   0.0665744)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          88.96 using 59 PHA bins.
# Reduced chi-squared =          1.561 for     57 degrees of freedom 
# Null hypothesis probability =   4.310718e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.941e-08   6.486e-09
25- 50  1.442e-07   1.786e-08
50-150  1.784e-07   3.235e-08
15-150  3.620e-07   4.367e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 175.758       (-63.149      -175.487)
Norm        : 3.53227       (-0.342043     0.394704)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.63 using 59 PHA bins.
# Reduced chi-squared =          1.134 for     57 degrees of freedom 
# Null hypothesis probability =   2.274795e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.760e-08   2.619e-08
25- 50  1.280e-07   5.694e-08
50-150  2.688e-07   1.432e-07
15-150  4.644e-07   2.200e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.36965        (-2.14614      3.6357)
R1^2/D10^2  : 1.21431        (-0.884399      2.54127)
kT2 [keV]   : 22.3133        (-5.47796      27.7737)
R2^2/D10^2  : 1.81977E-02    (-0.0167359   0.0361005)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.39 using 59 PHA bins.
# Reduced chi-squared =          1.207 for     55 degrees of freedom 
# Null hypothesis probability =   1.397026e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.633e-08   3.370e-08
25- 50  1.281e-07   5.105e-08
50-150  2.572e-07   1.324e-07
15-150  4.516e-07   1.870e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.124 sec. to    0.876 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.51542     ( -0.227149   0.229944 )
Norm@50keV  : 1.33518E-02    ( -0.00186385   0.00185082 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.35 using 59 PHA bins.
# Reduced chi-squared =          1.111 for     57 degrees of freedom 
# Null hypothesis probability =   2.624219e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.67388 ( -0.23135  0.23171 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26366e-07 ( -1.90165e-08  1.92034e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.124 sec. to    0.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.13125     ( -0.958755   0.453801 )
Epeak [keV] : 112.562      ( -51.8791 -112.562 )
Norm@50keV  : 2.10264E-02    ( -0.00927163   0.0426193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.70 using 59 PHA bins.
# Reduced chi-squared =          1.120 for     56 degrees of freedom 
# Null hypothesis probability =   2.507521e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.65283 ( -0.23597  0.23595 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.23254e-07 ( -2.04169e-08  2.03181e-08 ) ergs/cm2

Band function

Time interval is from   -0.124 sec. to    0.876 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 14.5838  (-2.55627  3.24221)
R^2/D10^2   : 0.209368  (-0.207714   0.204884)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.45 using 59 PHA bins.
# Reduced chi-squared =          1.341 for     57 degrees of freedom 
# Null hypothesis probability =   4.375658e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.362e-09   2.615e-09
25- 50  3.623e-08   7.410e-09
50-150  5.177e-08   1.288e-08
15-150  9.737e-08   1.970e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.362       (-86.6931      -199.363)
Norm        : 6.87593       (-0.927404     0.92789)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.81 using 59 PHA bins.
# Reduced chi-squared =          1.102 for     57 degrees of freedom 
# Null hypothesis probability =   2.779807e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.712e-08   9.750e-09
25- 50  3.294e-08   1.848e-08
50-150  7.223e-08   4.051e-08
15-150  1.223e-07   6.810e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.06890        (-2.21996      3.03059)
R1^2/D10^2  : 1.76347        (-1.20682      4.92498)
kT2 [keV]   : 27.0986        (-8.06762      25.0126)
R2^2/D10^2  : 1.86253E-02    (-0.0163276   0.0499542)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.34 using 59 PHA bins.
# Reduced chi-squared =          1.115 for     55 degrees of freedom 
# Null hypothesis probability =   2.593154e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.657e-08   9.369e-09
25- 50  3.337e-08   1.771e-08
50-150  7.530e-08   4.087e-08
15-150  1.252e-07   6.122e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59103     ( -0.157829   0.159718 )
Norm@50keV  : 6.73366E-03    ( -0.000640211   0.000635611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.69 using 59 PHA bins.
# Reduced chi-squared =          1.152 for     57 degrees of freedom 
# Null hypothesis probability =   2.011149e-01
 
Photon flux (15-150 keV)    in 7.568 sec: 0.862921 ( -0.079947  0.0800563 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.77115e-07 ( -4.85828e-08  4.9023e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.21735     ( -0.716238   0.454528 )
Epeak [keV] : 101.066      ( -39.3824 -101.07 )
Norm@50keV  : 1.05522E-02    ( -0.00430542   0.0139966 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.65 using 59 PHA bins.
# Reduced chi-squared =          1.154 for     56 degrees of freedom 
# Null hypothesis probability =   2.002077e-01
 
Photon flux (15-150 keV)    in 7.568 sec: 0.849309 ( -0.082712  0.083087 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.62932e-07 ( -5.46289e-08  5.44851e-08 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 1.23e-07
S(50-100 keV) = 1.63e-07

T90 vs. Hardness ratio plot

T90                                   = 6.51199996471405 sec.
Hardness ratio (energy fluence ratio) = 1.3252

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.22823
Count Ratio (50-100 keV) / (15-25 keV) = 0.936625

Mask shadow pattern

IMX = 4.698404545818621E-01, IMY = -2.852622809348173E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-239.424000 -4.260000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 40.9369  61.4302    0.5  23.8   19.9   5.3637  24.3 ------	UNKNOWN                       
349.2280  75.7389    2.7  42.5   -4.0   1.4761   4.3 ------	UNKNOWN                       
 36.8211  -4.6307    2.4  42.9 -174.6   1.9713   4.9 ------	UNKNOWN

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

Time interval of the image:
-4.260000 3.308000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 55.5532  63.5955    0.6  28.8   31.3   0.8040  18.4 ------	UNKNOWN                       
333.7544  50.9720    2.3  43.0  -41.9   0.3348   5.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
71.076600 962.660900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
159.9101  56.8508    2.8  46.4   25.0   5.6112   4.1 ------	UNKNOWN                       
 97.5659  61.3008    3.4  19.2   55.6   2.4457   3.4 ------	UNKNOWN                       
 40.9262  61.4328    0.3   7.1 -123.1  21.2468  35.3 ------	UNKNOWN

Plot creation:
Thu Mar 21 14:31:01 EDT 2019