batgrbproduct analysis for trigger=887217

batgrbproduct Analysis for Trigger=887217

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): Thu Mar 21 17:13:24 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger887217
======================================================================

  Trigger: 00887217      Segment: 000

  BAT Trigger Time: 570764392.704   [s; MET]
      Trigger Stop: 570764395.776   [s; MET]
               UTC: 2019-02-02T01:39:30.355340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 166.512275970226   Dec: 9.38809738122639  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.85
     Image Trigger?:     NO
     Rate S/N Ratio:     68.0661443009665  [ if not an image trigger ]
     Image S/N Ratio:    7.85

  Flight Position:   [ source = BAT ]
    RA: 166.512275970226   Dec: 9.38809738122639  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 166.505509020556   Dec: 9.39026649349575  [deg; J2000]  
        { 11h 06m 01.3s , +09d 23' 25.0" }
         +/- 1.74048997619557 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.750723497980808 [arcmin] (formal 1-sigma fit error)
    SNR: 13.7816721276957
 
  Angular difference between Flight and Ground position is 0.421189 arcmin
 
  Partial Coding Fraction: 0.04492188    [ including projection effects ]

  Duration
     T90: 15.9999998807907 +/- 5.27495512093061
        Measured from: -2.1360000371933
                   to: 13.8639998435974     [s; relative to TRIGTIME]
     T50: 6.52799987792969 +/- 2.0339517767937
        Measured from: 1.19200003147125
                   to: 7.71999990940094     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.69200003147125     
                   to: 5.69200003147125     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.82400000095367     
                   to: 23.3999999761581     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.669658   3.111241   3.121640   1.166648
           0.205915   0.234521   0.221021   0.174580 [error]
 Peak      0.189556   0.365042   0.349911   0.193793
           0.046523   0.060386   0.060212   0.047334 [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 7.08e-07 1.46e-06 2.34e-06 8.38e-06 6.49e-06 1.29e-05   erg/cm2
              Error 1.03e-07 1.30e-07 2.07e-07 1.60e-06 5.28e-07 1.73e-06   erg/cm2
Peak flux Power-law 4.10e-04 5.12e-03 5.00e-02 4.99e+00 2.62e-01 4.99e+00   ph/cm2/s
              Error 3.91e-04 4.07e-03 3.81e-02 2.29e+00 1.56e-01 2.35e+00   ph/cm2/s
 
Fluence   Cutoff-PL 6.24e-07 1.52e-06 2.50e-06 4.54e-06 6.38e-06 9.17e-06   erg/cm2
              Error 1.26e-07 1.47e-07 2.56e-07 2.60e-06 5.42e-07 2.59e-06   erg/cm2
Peak flux Cutoff-PL 1.84e+00 2.95e+00 2.47e+00 1.12e+00 8.03e+00 8.38e+00   ph/cm2/s
              Error 8.43e-01 7.09e-01 5.87e-01 1.81e+00 1.53e+00 2.32e+00   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    1.318    0.128    -      -           2.33e-02 1.81e-03   48.410 57
CPL   0.772    0.523     128.9  261.6      4.12e-02 2.32e-02   44.770 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.244    0.283    -      -           6.93e-02 1.25e-02   50.920 57
CPL   0.110    1.629      84.9  -29.0      2.59e-01 1.22e+00   49.100 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: 10.240000 sec.
T50 in the 50-300 keV band: 4.416000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   28.224   -4.824   23.400
T90    16.000   -2.136   13.864
T50     6.528    1.192    7.720
Peak    1.000    4.692    5.692

Click here for the BAT GCN circular template

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

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  166.5055     9.3903   0.0140    49.5442   141.5722         8.5552557     13.782 TRIG_00887217                 
 
Foreground time interval of the image:
 -2.920  30.328 (delta_t =  33.248 [sec])
Background time interval of the image:
-64.803  -2.920 (delta_t =  61.883 [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

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

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   -4.824 sec. to   23.400 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31763     ( -0.127937   0.127183 )
Norm@50keV  : 2.33302E-02    ( -0.0018084   0.00180763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.41 using 59 PHA bins.
# Reduced chi-squared =         0.8492 for     57 degrees of freedom 
# Null hypothesis probability =   7.840672e-01
 
Photon flux (15-150 keV)    in 28.22 sec: 2.79262 ( -0.22997  0.23064 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.47928e-06 ( -5.27638e-07  5.29246e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.824 sec. to   23.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.772011     ( -0.553302   0.491766 )
Epeak [keV] : 128.938      ( -38.6826 484.452 )
Norm@50keV  : 4.11529E-02    ( -0.0161518   0.0302104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.77 using 59 PHA bins.
# Reduced chi-squared =         0.7994 for     56 degrees of freedom 
# Null hypothesis probability =   8.594822e-01
 
Photon flux (15-150 keV)    in 28.22 sec: 2.73545 ( -0.23542  0.23606 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.38847e-06 ( -5.42228e-07  5.4159e-07 ) ergs/cm2

Band function

Time interval is from   -4.824 sec. to   23.400 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]    : 19.2333  (-1.80039  2.03165)
R^2/D10^2   : 0.145180  (-0.0422954   0.058219)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.47 using 59 PHA bins.
# Reduced chi-squared =          1.306 for     57 degrees of freedom 
# Null hypothesis probability =   6.003162e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.966e-07   4.514e-08
25- 50  1.439e-06   1.491e-07
50-150  3.920e-06   5.037e-07
15-150  5.656e-06   5.813e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-20.0501      -200)
Norm        : 11.8181       (-0.923423     0.923423)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.96 using 59 PHA bins.
# Reduced chi-squared =         0.9993 for     57 degrees of freedom 
# Null hypothesis probability =   4.765733e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.307e-07   7.760e-08
25- 50  1.598e-06   1.901e-07
50-150  3.505e-06   8.981e-07
15-150  5.934e-06   1.311e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.38033        (-1.93378      2.37836)
R1^2/D10^2  : 1.94419        (-1.1525      3.79954)
kT2 [keV]   : 27.8482        (-4.53871      7.50312)
R2^2/D10^2  : 3.47083E-02    (-0.0199713   0.040619)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.48 using 59 PHA bins.
# Reduced chi-squared =         0.7724 for     55 degrees of freedom 
# Null hypothesis probability =   8.912847e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.298e-07   3.010e-07
25- 50  1.508e-06   4.830e-07
50-150  4.324e-06   1.398e-06
15-150  6.462e-06   2.183e-06

Peak spectrum fit

Power-law model

Time interval is from    4.692 sec. to    5.692 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24425     ( -0.285079   0.281102 )
Norm@50keV  : 6.92935E-02    ( -0.0125287   0.0125061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.92 using 59 PHA bins.
# Reduced chi-squared =         0.8934 for     57 degrees of freedom 
# Null hypothesis probability =   7.011137e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.261640 ( -0.047906  0.263884 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.94624e-07 ( -1.37528e-07  1.38577e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    4.692 sec. to    5.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.110338     ( -2.01023   1.24795 )
Epeak [keV] : 84.8590      ( -26.87 -84.8435 )
Norm@50keV  : 0.258821    ( -0.25897   2.17955 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.10 using 59 PHA bins.
# Reduced chi-squared =         0.8767 for     56 degrees of freedom 
# Null hypothesis probability =   7.315538e-01
 
Photon flux (15-150 keV)    in 1 sec: 8.03356 ( -1.53841  1.52778 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.54953e-07 ( -1.48441e-07  1.50221e-07 ) ergs/cm2

Band function

Time interval is from    4.692 sec. to    5.692 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]    : 16.7244  (-2.8379  3.66386)
R^2/D10^2   : 0.731661  (-0.365863   0.647093)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.96 using 59 PHA bins.
# Reduced chi-squared =         0.8940 for     57 degrees of freedom 
# Null hypothesis probability =   6.999003e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.186e-08   1.455e-08
25- 50  1.828e-07   5.668e-08
50-150  3.631e-07   1.270e-07
15-150  5.878e-07   1.662e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-65.0857      -200)
Norm        : 33.8295       (-6.18595     6.18595)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.25 using 59 PHA bins.
# Reduced chi-squared =         0.9343 for     57 degrees of freedom 
# Null hypothesis probability =   6.163976e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.426e-08   4.925e-08
25- 50  1.621e-07   9.385e-08
50-150  3.555e-07   2.043e-07
15-150  6.019e-07   3.470e-07

Double BB

#Fit statistic : Chi-Squared =          47.64 using 59 PHA bins.
#Fit statistic : Chi-Squared =          47.61 using 59 PHA bins.
#Fit statistic : Chi-Squared =          47.60 using 59 PHA bins.
# Reduced chi-squared =         0.8682 for     55 degrees of freedom 
# Reduced chi-squared =         0.8676 for     55 degrees of freedom 
# Reduced chi-squared =         0.8661 for     55 degrees of freedom 
# Reduced chi-squared =         0.8657 for     55 degrees of freedom 
# Reduced chi-squared =         0.8654 for     55 degrees of freedom 
# Null hypothesis probability =   7.452344e-01
# Null hypothesis probability =   7.463371e-01
# Null hypothesis probability =   7.491319e-01
# Null hypothesis probability =   7.498936e-01
# Null hypothesis probability =   7.504589e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.112e-08   2.999e-08
25- 50  1.861e-07   1.151e-07
50-150  4.376e-07   2.176e-07
15-150  6.748e-07   3.328e-07

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: 1.31763     ( -0.127937   0.127183 )
Norm@50keV  : 2.33302E-02    ( -0.0018084   0.00180763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.41 using 59 PHA bins.
# Reduced chi-squared =         0.8492 for     57 degrees of freedom 
# Null hypothesis probability =   7.840672e-01
 
Photon flux (15-150 keV)    in 28.22 sec: 2.79260 ( -0.229978  0.230616 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.47863e-06 ( -5.28442e-07  5.29074e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.772002     ( -0.553303   0.491766 )
Epeak [keV] : 128.937      ( -38.6826 484.449 )
Norm@50keV  : 4.11533E-02    ( -0.0161519   0.0302104 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.77 using 59 PHA bins.
# Reduced chi-squared =         0.7994 for     56 degrees of freedom 
# Null hypothesis probability =   8.594822e-01
 
Photon flux (15-150 keV)    in 28.22 sec: 2.73527 ( -0.23538  0.23599 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.39124e-06 ( -5.43545e-07  5.41824e-07 ) 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)  = 1.46e-06
S(50-100 keV) = 2.34e-06

T90 vs. Hardness ratio plot

T90                                   = 15.9999998807907 sec.
Hardness ratio (energy fluence ratio) = 1.60274

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.8634
Count Ratio (50-100 keV) / (15-25 keV) = 1.86963

Mask shadow pattern

IMX = -9.186677255588864E-01, IMY = -7.288537295523887E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:
-64.803400 -4.824000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6322  22.0241    0.8  39.1    8.2   2.3693  14.9    0.6	Crab                          
135.7083 -40.4491    5.9  44.6 -136.7   0.5055   2.0   10.4	Vela X-1                      
125.6770   1.3470    2.5   8.3  150.3   0.4910   4.6 ------	UNKNOWN                       
143.9096 -45.4563    2.9  52.0 -140.3   2.2410   3.9 ------	UNKNOWN

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

Time interval of the image:
-4.824000 23.400000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5439  21.9178    4.2  39.1    8.0  -0.3665  -2.8    7.6	Crab                          
135.5019 -40.6665    3.9  44.7 -136.4   0.6329   3.0    6.8	Vela X-1                      
159.2365  17.3713    4.0  44.3  128.9   1.5470   2.9 ------	UNKNOWN                       
166.5050   9.3930    0.9  49.5  141.6   9.3132  12.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
150.796590 962.459800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
173.7104  22.4132    3.7  14.8 -170.0   2.5422   3.1 ------	UNKNOWN                       
188.1082 -18.8227    3.5  35.3  -54.2   5.4196   3.3 ------	UNKNOWN

Plot creation:
Thu Mar 21 17:29:52 EDT 2019