batgrbproduct analysis for trigger=888648

batgrbproduct Analysis for Trigger=888648

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 22:27:41 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger888648
======================================================================

  Trigger: 00888648      Segment: 000

  BAT Trigger Time: 571596907.136   [s; MET]
      Trigger Stop: 571596909.184   [s; MET]
               UTC: 2019-02-11T16:54:44.735040    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 196.67538854469   Dec: 41.9660247246067  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.93
     Image Trigger?:     NO
     Rate S/N Ratio:     9.16515138991168  [ if not an image trigger ]
     Image S/N Ratio:    6.93

  Flight Position:   [ source = BAT ]
    RA: 196.67538854469   Dec: 41.9660247246067  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 196.651839434863   Dec: 41.9686001671772  [deg; J2000]  
        { 13h 06m 36.4s , +41d 58' 07.0" }
         +/- 2.4082520685682 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.12611541339411 [arcmin] (formal 1-sigma fit error)
    SNR: 8.66622362410689
 
  Angular difference between Flight and Ground position is 1.061867 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 10.8960000276566 +/- 1.54339884541641
        Measured from: -9.44000005722046
                   to: 1.4559999704361     [s; relative to TRIGTIME]
     T50: 7.27999997138977 +/- 3.10916066829362
        Measured from: -6.5440000295639
                   to: 0.735999941825867     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.564000010490417     
                   to: 1.56400001049042     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -9.75999999046326     
                   to: 1.66399991512299     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.202334   0.282970   0.231516   0.139260
           0.049711   0.050967   0.045443   0.040626 [error]
 Peak      0.070087   0.059704   0.085217   0.020614
           0.015647   0.017049   0.015913   0.012892 [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 6.33e-08 1.30e-07 2.09e-07 7.49e-07 5.79e-07 1.15e-06   erg/cm2
              Error 2.46e-08 2.84e-08 4.61e-08 4.14e-07 1.13e-07 4.32e-07   erg/cm2
Peak flux Power-law 4.92e-01 5.98e-01 5.27e-01 7.99e-01 1.90e+00 2.42e+00   ph/cm2/s
              Error 2.43e-01 1.71e-01 1.25e-01 4.58e-01 4.38e-01 5.24e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.93e-08 1.30e-07 1.94e-07 7.77e-07 2.19e-07 1.12e-06   erg/cm2
              Error -------- 2.99e-08 4.62e-08 5.27e-07 -------- 4.52e-07   erg/cm2
Peak flux Cutoff-PL 4.92e-01 6.04e-01 5.26e-01 8.16e-01 1.90e+00 2.38e+00   ph/cm2/s
              Error -------- 1.80e-01 -------- -------- 4.38e-01 5.15e-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    1.317    0.374    -      -           5.15e-03 9.19e-04   64.210 57
CPL   2.588    0.960     191.4    0.0      1.15e-03 0.00e+00   61.690 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.182    0.447    -      -           1.62e-02 3.48e-03   54.520 57
CPL   1.182    0.455    10000.0    0.0      1.63e-02 -6.43e-03   54.550 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: 1.280000 sec.
T50 in the 50-300 keV band: 0.640000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   11.424   -9.760    1.664
T90    10.896   -9.440    1.456
T50     7.280   -6.544    0.736
Peak    1.000    0.564    1.564

Click here for the BAT GCN circular template

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
  196.6518    41.9686   0.0222    42.0614  -132.2798         0.9446369      8.666 TRIG_00888648                 
 
Foreground time interval of the image:
 -9.760   1.664 (delta_t =  11.424 [sec])
Background time interval of the image:
-157.635  -9.760 (delta_t = 147.875 [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 2.048000

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 2.048000

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 2.048000

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   -9.760 sec. to    1.664 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31699     ( -0.380114   0.367829 )
Norm@50keV  : 5.15187E-03    ( -0.000919366   0.000919191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.21 using 59 PHA bins.
# Reduced chi-squared =          1.126 for     57 degrees of freedom 
# Null hypothesis probability =   2.387345e-01
 
Photon flux (15-150 keV)    in 11.42 sec: 0.616585 ( -0.119643  0.120003 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.79104e-07 ( -1.12738e-07  1.13056e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -9.760 sec. to    1.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.58759     ( -0.654064   1.266 )
Epeak [keV] : 191.353      (   )
Norm@50keV  : 1.14735E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.69 using 59 PHA bins.
# Reduced chi-squared =          1.102 for     56 degrees of freedom 
# Null hypothesis probability =   2.800006e-01
 
Photon flux (15-150 keV)    in 11.42 sec: 0.210089 ( -0.135509  0.182435 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.18805e-07 ( 0  0 ) ergs/cm2

Band function

Time interval is from   -9.760 sec. to    1.664 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]    : 23.8032  (-7.03411  12.2531)
R^2/D10^2   : 1.45251E-02  (-0.0100641   0.0306307)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          80.76 using 59 PHA bins.
# Reduced chi-squared =          1.417 for     57 degrees of freedom 
# Null hypothesis probability =   2.090475e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.675e-08   7.897e-09
25- 50  9.259e-08   3.810e-08
50-150  3.911e-07   1.647e-07
15-150  5.004e-07   1.807e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-71.6493      -200)
Norm        : 2.56867       (-0.467555     0.467556)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.58 using 59 PHA bins.
# Reduced chi-squared =          1.186 for     57 degrees of freedom 
# Null hypothesis probability =   1.592737e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.305e-08   4.255e-08
25- 50  1.405e-07   8.120e-08
50-150  3.082e-07   1.802e-07
15-150  5.218e-07   3.014e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.94687        (-1.81741      2.75285)
R1^2/D10^2  : 3.13309        (-2.73569      17.4074)
kT2 [keV]   : 41.8939        (-15.4663      77.0341)
R2^2/D10^2  : 2.52016E-03    (-0.00213904   0.0040839)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.35 using 59 PHA bins.
# Reduced chi-squared =          1.097 for     55 degrees of freedom 
# Null hypothesis probability =   2.886499e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.966e-08   5.259e-08
25- 50  9.658e-08   4.658e-08
50-150  4.423e-07   2.545e-07
15-150  6.286e-07   3.335e-07

Peak spectrum fit

Power-law model

Time interval is from    0.564 sec. to    1.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.18223     ( -0.45594   0.438047 )
Norm@50keV  : 1.61868E-02    ( -0.00351224   0.00343833 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.52 using 59 PHA bins.
# Reduced chi-squared =         0.9565 for     57 degrees of freedom 
# Null hypothesis probability =   5.686573e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.89529 ( -0.43825  0.43816 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.65082e-07 ( -3.74322e-08  3.72059e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.564 sec. to    1.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.18174     ( -0.507366   0.401707 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 1.62703E-02    ( -0.00341924   -0.0162702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.55 using 59 PHA bins.
# Reduced chi-squared =         0.9740 for     56 degrees of freedom 
# Null hypothesis probability =   5.300679e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.89729 ( -0.44078  0.43587 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.64892e-07 ( -3.73216e-08  3.7368e-08 ) ergs/cm2

Band function

Time interval is from    0.564 sec. to    1.564 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]    : 31.3554  (-8.75388  15.9806)
R^2/D10^2   : 2.09939E-02  (-0.0142754   0.0355677)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.42 using 59 PHA bins.
# Reduced chi-squared =          1.130 for     57 degrees of freedom 
# Null hypothesis probability =   2.331037e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.202e-08   1.321e-08
25- 50  3.153e-08   1.926e-08
50-150  5.677e-09   4.471e-09
15-150  5.922e-08   3.561e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-73.4061      -200)
Norm        : 7.96273       (-1.7296     1.7296)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.71 using 59 PHA bins.
# Reduced chi-squared =          1.030 for     57 degrees of freedom 
# Null hypothesis probability =   4.126784e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.983e-08   1.187e-08
25- 50  3.814e-08   2.231e-08
50-150  8.366e-08   4.900e-08
15-150  1.416e-07   8.260e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.63553        (-1.30625      1.75808)
R1^2/D10^2  : 13.4492        (-10.437      51.8986)
kT2 [keV]   : 43.4194        (-13.9714      44.3339)
R2^2/D10^2  : 7.72711E-03    (-0.00617771   0.0152543)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.91 using 59 PHA bins.
# Reduced chi-squared =         0.8346 for     55 degrees of freedom 
# Null hypothesis probability =   8.039022e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.569e-08   1.498e-08
25- 50  2.526e-08   1.249e-08
50-150  1.305e-07   7.381e-08
15-150  1.815e-07   9.532e-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: 1.31699     ( -0.380114   0.367829 )
Norm@50keV  : 5.15187E-03    ( -0.000919366   0.000919191 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.21 using 59 PHA bins.
# Reduced chi-squared =          1.126 for     57 degrees of freedom 
# Null hypothesis probability =   2.387345e-01
 
Photon flux (15-150 keV)    in 11.42 sec: 0.616577 ( -0.119636  0.119994 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.79034e-07 ( -1.12722e-07  1.13121e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31600     ( -0.581145   0.337015 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 5.17263E-03    ( -0.000922385   -0.00517262 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.23 using 59 PHA bins.
# Reduced chi-squared =          1.147 for     56 degrees of freedom 
# Null hypothesis probability =   2.104288e-01
 
Photon flux (15-150 keV)    in 11.42 sec: 0.622439 ( -0.122772  0.114745 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.75646e-07 ( -1.0983e-07  1.12815e-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)  = 1.30e-07
S(50-100 keV) = 2.09e-07

T90 vs. Hardness ratio plot

T90                                   = 10.8960000276566 sec.
Hardness ratio (energy fluence ratio) = 1.60769

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.39853
Count Ratio (50-100 keV) / (15-25 keV) = 1.14423

Mask shadow pattern

IMX = -6.070552152356010E-01, IMY = 6.676171462328306E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000

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:
-157.635400 -9.760000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
125.7408   6.7196    2.3  40.4  103.3   4.0930   4.9 ------	UNKNOWN                       
139.5220 -32.2466    3.2  48.9   44.4   3.2218   3.6 ------	UNKNOWN                       
185.5962 -22.7606    3.3  37.1  -16.2   0.8675   3.5 ------	UNKNOWN

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

Time interval of the image:
-9.760000 1.664000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
196.6527  41.9691    1.3  42.1 -132.3   0.9463   8.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
180.364600 962.993000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
208.3439 -13.6792    3.0  56.7    3.0   9.9849   3.9 ------	UNKNOWN                       
189.2589  84.6124    2.4  42.7 -164.4   6.0298   4.7 ------	UNKNOWN                       
226.1379  31.8718    2.7  25.5  -59.7   3.4298   4.3 ------	UNKNOWN                       
241.1902  50.8025    3.4  31.4 -105.2   3.6663   3.4 ------	UNKNOWN                       
238.6447   8.0985    3.0  50.1  -43.1  11.9882   3.8 ------	UNKNOWN

Plot creation:
Thu Mar 21 16:34:00 EDT 2019