batgrbproduct analysis for trigger=1007266

batgrbproduct Analysis for Trigger=1007266

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
4) This page will be updated for up to 15 downlinks after the trigger.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time (local time): Thu Nov 19 06:31:29 EST 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger1007266/GCN5_download_cron
======================================================================

  Trigger: 01007266      Segment: 000

  BAT Trigger Time: 627376112   [s; MET]
      Trigger Stop: 627376288   [s; MET]
               UTC: 2020-11-18T07:08:05.998020    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 84.7205635396726   Dec: 26.3266571610648  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    26.23
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    26.23

  Flight Position:   [ source = BAT ]
    RA: 84.7205635396726   Dec: 26.3266571610648  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 84.7422254031269   Dec: 26.3325535713531  [deg; J2000]  
        { 05h 38m 58.1s , +26d 19' 57.2" }
         +/- 2.06704731877832 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.04247485414949 [arcmin] (formal 1-sigma fit error)
    SNR: 10.7799757029393
 
  Angular difference between Flight and Ground position is 1.217415 arcmin
 
  Partial Coding Fraction: 0.4492188    [ including projection effects ]

  Duration
     T90: 382.65600001812 +/- 11.4394023176173
        Measured from: -195.579999923706
                   to: 187.076000094414     [s; relative to TRIGTIME]
     T50: 197.09199988842 +/- 4.56400702190695
        Measured from: -70.1519998311996
                   to: 126.94000005722     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 148.672000050545     
                   to: 149.672000050545     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -228.927999973297     
                   to: 201.588000059128     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    80.042737  63.644195   8.927840   0.361284
           0.280460   0.267415   0.182140   0.146859 [error]
 Peak      0.321953   0.247570   0.032652  -0.005981
           0.015492   0.014918   0.009030   0.006665 [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 4.22e-05 2.34e-05 8.18e-06 3.73e-06 7.59e-05 7.76e-05   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Power-law 3.72e+00 1.59e+00 4.03e-01 1.26e-01 5.78e+00 5.83e+00   ph/cm2/s
              Error 3.35e-01 1.30e-01 6.26e-02 3.37e-02 4.36e-01 4.38e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.79e-05 2.76e-05 6.78e-06 2.42e-07 6.25e-05 6.26e-05   erg/cm2
              Error 1.55e-06 5.58e-07 2.68e-07 5.37e-08 1.82e-06 1.82e-06   erg/cm2
Peak flux Cutoff-PL 3.26e+00 2.07e+00 2.40e-01 2.46e-03 5.56e+00 5.56e+00   ph/cm2/s
              Error 3.82e-01 1.92e-01 8.31e-02 4.62e-03 4.41e-01 4.41e-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    3.519    0.000    -      -           1.11e-02 0.00e+00  604.930 57
CPL   0.601    0.270      19.4    2.0      4.89e-01 1.74e-01   50.740 56
 
The chi2 of BB fit is 207.27 which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.978    0.149    -      -           2.14e-02 2.60e-03   94.980 57
CPL   0.029    1.187      22.5    4.0      1.75e+00 8.22e+00   55.150 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: 1.792000 sec.
T50 in the 50-300 keV band: 0.640000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  430.516 -228.928  201.588
T90   382.656 -195.580  187.076
T50   197.092  -70.152  126.940
Peak    1.000  148.672  149.672

Click here for the BAT GCN circular template

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

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   84.7422 +26.3326 0.0179   29.3  106.4      29.6789    10.8  TRIG_01007266       
------------------------------------------
 
Foreground time interval of the image:
-228.928 175.001 (delta_t = 403.929 [sec])
Background time interval of the image:
-239.000 -228.928 (delta_t =  10.072 [sec])

Lightcurves

Notes:

1) All plots contain as much data as has been downloaded to date.
2) The mask-weighted light curves are using the flight position.
3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
4) 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.
5) 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.
6) 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)

Spectra

Notes:

1) The fitting includes the systematic errors.
2) For long bursts, a spectral fit of 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.
4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.

Time averaged spectrum fit using the pre-slew DRM

Power-law model

Time interval is from -228.928 sec. to  201.588 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.51927     (     )
Norm@50keV  : 1.10701E-02    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  604.93     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.39e-92 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 430.5 sec: 4.54818 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.58864e-05 ( 0  0 ) ergs/cm2

Cutoff power-law model

Time interval is from -228.928 sec. to  201.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.601248     ( -0.275006   0.264023 )
Epeak [keV] : 19.4283      ( -2.13387 1.86101 )
Norm@50keV  : 0.489275    ( -0.140336   0.206687 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.74     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.74e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 430.5 sec: 3.48104 ( -0.13202  0.13401 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.25461e-05 ( -1.81284e-06  1.83092e-06 ) ergs/cm2

Band function

Time interval is from -228.928 sec. to  201.588 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.475278   ( -0.333432   0.549069 )
beta        : -5.63196    ( 5.62924   0.954891 )
Epeak [keV] : 20.1457      ( -2.40344 2.61033 )
Norm@50keV   : 0.585489    ( -0.209359   0.681222 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 430.5 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]    : 7.36950  (  )
R^2/D10^2   : 4.78708  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  207.27     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.19e-19 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.891e-05   6.866e-07
25- 50  2.855e-05   5.661e-07
50-150  5.679e-06   2.131e-07
15-150  5.314e-05   1.141e-06

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 19.2405       (-0.425398      0.440019)
Norm        : 49.1708       (-2.33996     2.44464)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   75.81     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.85e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.175e-05   1.005e-06
25- 50  2.697e-05   4.865e-07
50-150  7.563e-06   2.540e-07
15-150  6.628e-05   1.421e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.37723        (-0.443375      0.41369)
R1^2/D10^2  : 15.3942        (-3.52651      5.57409)
kT2 [keV]   : 10.1713        (-0.783691      1.07538)
R2^2/D10^2  : 0.486090    (-0.248626   0.384561)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   42.13     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.99e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.581e-05   2.226e-06
25- 50  2.792e-05   1.935e-06
50-150  7.138e-06   1.246e-06
15-150  6.087e-05   5.166e-06

Peak spectrum fit

Power-law model

Time interval is from  148.672 sec. to  149.672 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.97806     ( -0.144286   0.153366 )
Norm@50keV  : 2.13701E-02    ( -0.00259906   0.0026084 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   94.98     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.19e-03 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.78397 ( -0.436248  0.436544 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.54212e-07 ( -2.03202e-08  2.04602e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  148.672 sec. to  149.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.91482E-02     ( -1.31186   1.06241 )
Epeak [keV] : 22.5080      ( -5.02169 3.04602 )
Norm@50keV  : 1.75092    ( -2.38444   14.054 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.15     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.07e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 5.56427 ( -0.44062  0.44092 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.34342e-07 ( -1.8629e-08  1.8942e-08 ) ergs/cm2

Band function

Time interval is from  148.672 sec. to  149.672 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.157807   ( -0.94798   1.52199 )
beta        : -10.0000    ( 10   10 )
Epeak [keV] : 23.0532      ( -5.0034 3.08594 )
Norm@50keV   : 2.37742    ( -2.37736   14.026 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 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]    : 6.60391  (-0.431225  0.450712)
R^2/D10^2   : 14.3078  (-3.7102   5.11946)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.12     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.98e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.398e-08   1.083e-08
25- 50  1.147e-07   1.070e-08
50-150  1.532e-08   4.265e-09
15-150  2.239e-07   1.795e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 21.7381       (-2.54797      2.92149)
Norm        : 65.1460       (-9.92296     11.9389)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.47     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.19e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.081e-07   1.007e-08
25- 50  1.007e-07   8.755e-09
50-150  3.458e-08   8.840e-09
15-150  2.434e-07   2.065e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.72263        (-3.17526      5.29374)
R1^2/D10^2  : 32.8708        (-22.3447      9974.8)
kT2 [keV]   : 8.51295        (-6.9639      6.42026)
R2^2/D10^2  : 2.75790    (-2.70869   10.4214)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.70     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.86e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.010e-07   5.620e-08
25- 50  1.091e-07   5.660e-08
50-150  2.461e-08   1.457e-08
15-150  2.347e-07   1.192e-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: 3.51747     (     )
Norm@50keV  : 1.10876E-02    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  592.18     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.53e-90 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 403.9 sec: 4.54866 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.12306e-05 ( 0  0 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.606707     ( -0.277773   0.266579 )
Epeak [keV] : 19.3495      ( -2.15906 1.87939 )
Norm@50keV  : 0.488333    ( -0.141426   0.209236 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.05     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.25e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 403.9 sec: 3.48713 ( -0.13284  0.13484 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.87299e-05 ( -1.71092e-06  1.72829e-06 ) ergs/cm2

Band function

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.446418   ( -0.350061   0.504329 )
beta        : -5.56601    ( 5.55945   0.678983 )
Epeak [keV] : 20.2636      ( -2.52136 2.39735 )
Norm@50keV   : 0.612968    ( -0.218113   0.630966 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 403.9 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)  = 2.34e-05
S(50-100 keV) = 8.18e-06

T90 vs. Hardness ratio plot

T90                                   = 382.65600001812 sec.
Hardness ratio (energy fluence ratio) = 0.349573

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.795128
Count Ratio (50-100 keV) / (15-25 keV) = 0.111538

Mask shadow pattern

IMX = -1.590461121139815E-01, IMY = -5.390723303507230E-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:
-239.000000 -228.928000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6197  22.0185    1.9  27.4   98.0   0.4409   6.1    0.8	Crab                          
 84.7164  26.3115    0.3  29.3  106.4   2.9211  37.6 ------	UNKNOWN                       
159.2850  31.5355    2.7  56.5 -157.1   1.0469   4.3 ------	UNKNOWN                       
120.8349 -35.8985    3.3  43.3  -50.0   0.3823   3.5 ------	UNKNOWN                       
126.2799 -34.7874    2.7  44.2  -56.5   0.6708   4.3 ------	UNKNOWN

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

Time interval of the image:
-228.928000 175.000600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.8194  22.0206    8.5  27.3   98.3   3.5212   1.4   10.4	Crab                          
 91.7582  50.6577    2.5  47.1  135.5  39.4500   4.6 ------	UNKNOWN                       
 84.7427  26.3325    1.0  29.3  106.4  30.5932  11.1 ------	UNKNOWN                       
115.5381  15.7463    3.5  14.3 -171.4   5.2273   3.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
302.000600 834.020000
835.000000 928.900610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
154.4784  13.3384    3.6  38.5   63.2   3.7147   3.2 ------	UNKNOWN                       
143.5026 -11.4165    2.7  52.3   29.9  10.0223   4.3 ------	UNKNOWN                       
231.6736  45.7144    2.6  51.7  173.4   6.6810   4.4 ------	UNKNOWN                       
156.5975 -34.0959    2.5  53.0   -2.5   4.7214   4.7 ------	UNKNOWN                       
191.6742 -27.9822    3.0  34.3  -38.4   2.4064   3.8 ------	UNKNOWN                       
235.3973  -5.1331    2.8  43.9 -116.3   9.3790   4.2 ------	UNKNOWN                       
242.4033   5.1682    2.5  49.2 -131.9  11.8427   4.6 ------	UNKNOWN

Plot creation:
Thu Nov 19 06:37:43 EST 2020