batgrbproduct analysis for trigger=1047531

batgrbproduct Analysis for Trigger=1047531

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 v2.48
    Process Start Time (local time): Fri Jul 29 23:17:48 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1047531
======================================================================

  Trigger: 01047531      Segment: 000

  BAT Trigger Time: 642263567.424   [s; MET]
      Trigger Stop: 642263568.448   [s; MET]
               UTC: 2021-05-09T14:32:20.436060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 350.352300001742   Dec: 6.67546089388726  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.09
     Image Trigger?:     NO
     Rate S/N Ratio:     10.5356537528527  [ if not an image trigger ]
     Image S/N Ratio:    8.09

  Flight Position:   [ source = BAT ]
    RA: 350.352300001742   Dec: 6.67546089388726  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 350.367813701445   Dec: 6.6467696170631  [deg; J2000]  
        { 23h 21m 28.3s , +06d 38' 48.4" }
         +/- 1.40323404027547 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.512558511716336 [arcmin] (formal 1-sigma fit error)
    SNR: 18.7470313858947
 
  Angular difference between Flight and Ground position is 1.954035 arcmin
 
  Partial Coding Fraction: 0.953125    [ including projection effects ]

  Duration
     T90: 10.8159999847412 +/- 1.4402000719477
        Measured from: -3.71200001239777
                   to: 7.10399997234344     [s; relative to TRIGTIME]
     T50: 4.67200005054474 +/- 1.12785818358311
        Measured from: -0.25600004196167
                   to: 4.41600000858307     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.25199997425079     
                   to: 4.25199997425079     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.68800008296967     
                   to: 7.66400003433228     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.330601   0.330923   0.138797   0.017729
           0.024555   0.025261   0.021610   0.018335 [error]
 Peak      0.048972   0.056051   0.041816  -0.002667
           0.007459   0.007676   0.006681   0.005040 [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 1.02e-07 1.30e-07 1.19e-07 1.91e-07 4.16e-07 5.42e-07   erg/cm2
              Error 1.22e-08 1.18e-08 1.95e-08 6.04e-08 4.51e-08 8.40e-08   erg/cm2
Peak flux Power-law 4.73e-01 3.93e-01 2.22e-01 1.85e-01 1.17e+00 1.27e+00   ph/cm2/s
              Error 9.93e-02 5.99e-02 5.03e-02 7.78e-02 1.78e-01 1.98e-01   ph/cm2/s
 
Fluence   Cutoff-PL 9.37e-08 1.49e-07 1.04e-07 2.64e-08 3.68e-07 3.73e-07   erg/cm2
              Error 1.38e-08 1.69e-08 2.55e-08 3.69e-08 4.77e-08 6.05e-08   erg/cm2
Peak flux Cutoff-PL 3.70e-01 4.90e-01 2.35e-01 3.01e-02 1.12e+00 1.12e+00   ph/cm2/s
              Error 1.19e-01 8.26e-02 6.41e-02 4.16e-02 1.78e-01 1.81e-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    2.120    0.170    -      -           3.61e-03 4.33e-04   57.720 57
CPL   0.806    0.908      35.3    8.3      2.22e-02 4.49e-02   49.590 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.825    0.248    -      -           8.40e-03 1.50e-03   57.620 57
CPL  -0.207    1.358      48.3   10.5      1.11e-01 3.68e-01   47.980 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   12.352   -4.688    7.664
T90    10.816   -3.712    7.104
T50     4.672   -0.256    4.416
Peak    1.000    3.252    4.252

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
  350.3678     6.6468   0.0102    23.0035  -167.3340         0.8672042     18.747 TRIG_01047531                 
 
Foreground time interval of the image:
 -4.688   7.664 (delta_t =  12.352 [sec])
Background time interval of the image:
-239.424  -4.688 (delta_t = 234.736 [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   -4.688 sec. to    7.664 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.12031     ( -0.16559   0.174419 )
Norm@50keV  : 3.61394E-03    ( -0.000436793   0.000429941 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.72     using 59 bins.
 Reduced chi-squared = 1.01263
# Null hypothesis probability of 4.48e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 12.35 sec: 0.574385 ( -0.051001  0.051006 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.15611e-07 ( -4.45826e-08  4.56079e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.688 sec. to    7.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.806357     ( -0.992605   0.824142 )
Epeak [keV] : 35.2855      ( -9.4787 7.05829 )
Norm@50keV  : 2.22484E-02    ( -0.0222484   0.0674802 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.59     using 59 bins.
 Reduced chi-squared = 0.885536
# Null hypothesis probability of 7.15e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 12.35 sec: 0.549856 ( -0.052245  0.05255 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.67508e-07 ( -4.51507e-08  5.01756e-08 ) ergs/cm2

Band function

Time interval is from   -4.688 sec. to    7.664 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]    : 9.17726  (-0.877929  0.966148)
R^2/D10^2   : 0.374564  (-0.121618   0.181)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.22     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.96e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.660e-08   1.157e-08
25- 50  1.678e-07   1.748e-08
50-150  6.793e-08   1.933e-08
15-150  3.123e-07   3.637e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 51.4920       (-11.0257      16.0561)
Norm        : 3.22598       (-0.452188     0.566655)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.56     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.14e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.806e-08   1.184e-08
25- 50  1.423e-07   1.439e-08
50-150  1.420e-07   3.987e-08
15-150  3.824e-07   5.014e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.23024        (-1.66166      1.8666)
R1^2/D10^2  : 1.91464        (-1.18378      6.12175)
kT2 [keV]   : 13.7887        (-2.95597      6.38991)
R2^2/D10^2  : 5.29659E-02    (-0.0443069   0.111697)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.76     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.11e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.493e-08   4.656e-08
25- 50  1.464e-07   7.416e-08
50-150  1.222e-07   6.875e-08
15-150  3.635e-07   1.831e-07

Peak spectrum fit

Power-law model

Time interval is from    3.252 sec. to    4.252 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82517     ( -0.239395   0.256173 )
Norm@50keV  : 8.39898E-03    ( -0.00151116   0.00148262 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.62     using 59 bins.
 Reduced chi-squared = 1.01088
# Null hypothesis probability of 4.52e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.16892 ( -0.178257  0.17828 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.72681e-08 ( -1.3811e-08  1.41432e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    3.252 sec. to    4.252 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.206960     ( -1.52084   1.19473 )
Epeak [keV] : 48.2699      ( -8.32959 12.7054 )
Norm@50keV  : 0.111190    ( -0.111818   0.623876 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   47.98     using 59 bins.
 Reduced chi-squared = 0.856786
# Null hypothesis probability of 7.68e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.12059 ( -0.177783  0.17874 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.95537e-08 ( -1.2595e-08  1.36955e-08 ) ergs/cm2

Band function

Time interval is from    3.252 sec. to    4.252 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]    : 12.1233  (-1.72634  1.94521)
R^2/D10^2   : 0.297242  (-0.126313   0.223176)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.93     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.35e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.247e-09   2.384e-09
25- 50  2.945e-08   5.930e-09
50-150  2.620e-08   8.480e-09
15-150  6.490e-08   1.316e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 84.1564       (-29.4855      62.4774)
Norm        : 5.55397       (-1.00391     1.28986)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.57     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.42e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.445e-08   3.040e-09
25- 50  2.408e-08   4.985e-09
50-150  3.515e-08   2.159e-08
15-150  7.368e-08   2.589e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.61198        (-3.16022      4.86834)
R1^2/D10^2  : 3.58239        (-3.3944      2544.02)
kT2 [keV]   : 14.1176        (-2.63538      4.31755)
R2^2/D10^2  : 0.147813    (-0.110682   0.200023)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.52     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.85e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.245e-08   6.485e-09
25- 50  2.664e-08   1.411e-08
50-150  3.082e-08   1.894e-08
15-150  6.991e-08   3.721e-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: 2.12031     ( -0.16559   0.174419 )
Norm@50keV  : 3.61394E-03    ( -0.000436793   0.000429941 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.72     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.48e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 12.35 sec: 0.574334 ( -0.0509954  0.0510013 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.15533e-07 ( -4.46382e-08  4.5627e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.806357     ( -0.992606   0.824142 )
Epeak [keV] : 35.2855      ( -9.4787 7.05829 )
Norm@50keV  : 2.22484E-02    ( -0.0222484   0.0674803 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.59     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.15e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 12.35 sec: 0.549747 ( -0.052225  0.052527 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.67583e-07 ( -4.51788e-08  5.01941e-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)  = 1.30e-07
S(50-100 keV) = 1.19e-07

T90 vs. Hardness ratio plot

T90                                   = 10.8159999847412 sec.
Hardness ratio (energy fluence ratio) = 0.915385

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.00097
Count Ratio (50-100 keV) / (15-25 keV) = 0.419832

Mask shadow pattern

IMX = -4.142163713626277E-01, IMY = 9.308937244723164E-02

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:
-239.424000 -4.688000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
315.3025   0.1834    2.6  47.9  145.2   4.3176   4.4 ------	UNKNOWN                       
 25.3640 -40.6478    2.6  34.2    9.6   1.3894   4.5 ------	UNKNOWN                       
 54.0112 -40.8601    4.2  53.0   -6.1   1.6753   2.8 ------	UNKNOWN                       
 57.5569 -39.7481    3.2  55.4   -8.2   2.8788   3.6 ------	UNKNOWN                       
 59.1265 -34.2457    3.3  55.7  -15.0   3.3844   3.5 ------	UNKNOWN                       
 23.2752   1.8202    3.5  26.3  -81.3   1.0607   3.3 ------	UNKNOWN

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

Time interval of the image:
-4.688000 7.664000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
333.0582 -42.6233    2.2  38.2   77.2   0.8037   5.2 ------	UNKNOWN                       
336.8321   3.2410    2.2  29.7  164.9   0.2881   5.2 ------	UNKNOWN                       
350.3678   6.6468    0.6  23.0 -167.3   0.8671  18.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
200.876600 308.476600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6561 -40.5827    6.3  42.3  156.5   0.5901   1.8    6.1	Vela X-1                      
167.7489   6.8593    3.2  35.0   59.8   1.1012   3.6 ------	UNKNOWN

Plot creation:
Sat Jul 30 07:02:15 EDT 2022