batgrbproduct analysis for trigger=1015615

batgrbproduct Analysis for Trigger=1015615

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): Sun Jan  3 12:45:05 EST 2021
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/prebascript/trigger1015615/GCN5_download_cron
======================================================================

  Trigger: 01015615      Segment: 000

  BAT Trigger Time: 631239458.88   [s; MET]
      Trigger Stop: 631239459.904   [s; MET]
               UTC: 2021-01-02T00:17:12.622860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 234.702708235065   Dec: -84.1885874751111  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.5
     Image Trigger?:     NO
     Rate S/N Ratio:     30.0665927567458  [ if not an image trigger ]
     Image S/N Ratio:    6.5

  Flight Position:   [ source = BAT ]
    RA: 234.702708235065   Dec: -84.1885874751111  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 233.491327613577   Dec: -84.1227525420591  [deg; J2000]  
        { 15h 33m 57.9s , -84d 07' 21.9" }
         +/- 4.38609183495855 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.34506990937341 [arcmin] (formal 1-sigma fit error)
    SNR: 3.68014129644817
 
  Angular difference between Flight and Ground position is 8.388943 arcmin
 
  Partial Coding Fraction: 0.6484375    [ including projection effects ]

  Duration
     T90: 42 +/- 5
        Measured from: -2.87999987602234
                   to: 39.1200001239777     [s; relative to TRIGTIME]
     T50: 26 +/- 6.70820393249937
        Measured from: 6.12000012397766
                   to: 32.1200001239777     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 32.1200000047684     
                   to: 33.1200000047684     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.87999999523163     
                   to: 41.1200000047684     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.903350   1.549570   0.429458   0.452152
           0.113384   0.141848   0.130744   0.169318 [error]
 Peak      0.053003   0.081348   0.045917   0.026377
           0.018363   0.023074   0.021273   0.027565 [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 3.11e-07 4.88e-07 5.78e-07 1.33e-06 1.76e-06 2.70e-06   erg/cm2
              Error 5.20e-08 6.19e-08 1.25e-07 5.58e-07 2.92e-07 6.98e-07   erg/cm2
Peak flux Power-law 5.57e-01 5.25e-01 3.44e-01 3.49e-01 1.57e+00 1.77e+00   ph/cm2/s
              Error 2.54e-01 1.72e-01 1.74e-01 4.02e-01 5.17e-01 6.44e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.60e-07 6.87e-07 2.87e-07 7.15e-09 1.24e-06 1.24e-06   erg/cm2
              Error 6.30e-08 1.11e-07 1.62e-07 3.89e-08 2.15e-07 2.17e-07   erg/cm2
Peak flux Cutoff-PL 5.08e-01 6.05e-01 3.38e-01 8.59e-02 1.52e+00 1.54e+00   ph/cm2/s
              Error 2.83e-01 2.46e-01 2.70e-01 3.64e-01 5.17e-01 6.62e-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    1.757    0.224    -      -           4.31e-03 6.82e-04  100.100 57
CPL  -2.127    2.456      37.9    4.9      1.16e+00 3.60e+01   89.230 56
 
The chi2 of BB fit is 89.49 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    1.611    0.597    -      -           1.22e-02 4.80e-03   55.540 57
CPL   0.485    3.217      56.2    0.0      5.49e-02 1.21e+01   54.900 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: 0.896000 sec.
T50 in the 50-300 keV band: 0.512000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   46.000   -4.880   41.120
T90    42.000   -2.880   39.120
T50    26.000    6.120   32.120
Peak    1.000   32.120   33.120

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
  233.4913 -84.1228 0.0523   25.6 -120.7       3.1077     3.7  TRIG_01015615       
------------------------------------------
 
Foreground time interval of the image:
 -4.880  17.500 (delta_t =  22.380 [sec])
 19.120  36.621 (delta_t =  17.501 [sec])
Background time interval of the image:
-10.880  -4.880 (delta_t =   6.000 [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

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)

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

Multiple GTIs in the spectrum
tstart tstop
-4.880000 17.500000
19.120000 41.120000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.75669     ( -0.217521   0.230535 )
Norm@50keV  : 4.30538E-03    ( -0.000688829   0.000674487 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  100.10     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.67e-04 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 44.38 sec: 0.583602 ( -0.0732566  0.0733048 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.76248e-06 ( -2.86136e-07  2.97914e-07 ) ergs/cm2

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
-4.880000 17.500000
19.120000 41.120000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.12705     ( -3.05493   1.85729 )
Epeak [keV] : 37.9005      ( -3.95371 5.8442 )
Norm@50keV  : 1.16238    ( -1.26151   70.6606 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   89.23     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.14e-03 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 44.38 sec: 0.525033 ( -0.068232  0.070727 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.24139e-06 ( -1.92396e-07  2.38325e-07 ) ergs/cm2

Band function

Multiple GTIs in the spectrum
tstart tstop
-4.880000 17.500000
19.120000 41.120000
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 3.37891   ( -4.14675   -4.40345 )
beta        : -2.96417    ( -1.25818   0.623847 )
Epeak [keV] : 34.8196      ( -3.29304 3.47984 )
Norm@50keV   : 9.03134    ( -8.91511   41.8497 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 44.38 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]    : 9.85319  (-1.05957  1.19181)
R^2/D10^2   : 0.312506  (-0.108488   0.16157)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   89.49     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.86e-03 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.728e-07   5.541e-08
25- 50  6.641e-07   1.076e-07
50-150  3.320e-07   1.148e-07
15-150  1.269e-06   2.312e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 85.4739       (-30.5549      69.7385)
Norm        : 2.70451       (-0.432146     0.544019)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   97.13     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.31e-04 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.126e-07   5.144e-08
25- 50  5.226e-07   9.049e-08
50-150  7.704e-07   4.362e-07
15-150  1.606e-06   5.332e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 200.000        (-200      -200)
R1^2/D10^2  : 5.38720E-05        (-3.11872e-05      0.000355254)
kT2 [keV]   : 9.05229        (-1.06238      1.17564)
R2^2/D10^2  : 0.397248    (-0.143094   0.226832)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   82.91     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.87e-03 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

Peak spectrum fit

Power-law model

Time interval is from   32.120 sec. to   33.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.61076     ( -0.554096   0.638986 )
Norm@50keV  : 1.21605E-02    ( -0.00493529   0.0046707 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.54     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.30e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.56793 ( -0.516696  0.517553 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13582e-07 ( -4.65498e-08  5.08228e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   32.120 sec. to   33.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.485341     ( -4.09137   2.34192 )
Epeak [keV] : 56.1858      ( -56.1858 -56.1858 )
Norm@50keV  : 5.49085E-02    ( -0.0549085   24.2082 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.90     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.17e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.51749 ( -0.50923  0.52432 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00015e-07 ( -4.3894e-08  5.7758e-08 ) ergs/cm2

Band function

Time interval is from   32.120 sec. to   33.120 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.72368   ( -1.426   2.57391 )
beta        : -2.12384    ( 9.37164   19.3716 )
Epeak [keV] : 33.3176      ( -32.6284 396.697 )
Norm@50keV   : 10.3322    ( -10.3449   200.417 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00249e-07 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 11.5340  (-3.97447  5.89554)
R^2/D10^2   : 0.466818  (-0.465347   1.55568)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.01     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.12e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.308e-08   8.035e-09
25- 50  3.925e-08   2.402e-08
50-150  3.055e-08   2.313e-08
15-150  8.288e-08   5.495e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 149.543       (-104.172      -143.751)
Norm        : 6.48489       (-2.18249     3.43111)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.19     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.43e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.624e-08   1.000e-08
25- 50  3.101e-08   1.848e-08
50-150  6.664e-08   4.203e-08
15-150  1.139e-07   7.015e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.74467        (-6.73653      -6.73653)
R1^2/D10^2  : 1.89718        (-1.90296      -1.90296)
kT2 [keV]   : 20.2796        (-20.2437      -20.2437)
R2^2/D10^2  : 4.17750E-02    (-0.04209   1.16829)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.51     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.93e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.661e-08   9.920e-09
25- 50  3.351e-08   1.901e-08
50-150  5.302e-08   3.317e-08
15-150  1.031e-07   5.580e-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: 1.76425     ( -0.243767   0.260024 )
Norm@50keV  : 4.15187E-03    ( -0.00073104   0.000710738 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   90.04     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.45e-03 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 39.88 sec: 0.564381 ( -0.0763128  0.0763606 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.52666e-06 ( -2.7095e-07  2.83175e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.510838     ( -3.28991   2.46322 )
Epeak [keV] : 38.8883      ( -5.96445 -38.7164 )
Norm@50keV  : 0.116095    ( -0.13358   15.8437 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   88.37     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.76e-03 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 39.88 sec: 0.514852 ( -0.077398  0.097605 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11179e-06 ( -2.26032e-07  5.76174e-07 ) ergs/cm2

Band function

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 2.51796   ( -2.32103   -1.45486 )
beta        : -2.54257    ( -1.84386   0.608635 )
Epeak [keV] : 33.2952      ( -7.34599 12.3016 )
Norm@50keV   : 2.95008    ( -2.94592   66.5993 )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 39.88 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)  = 4.88e-07
S(50-100 keV) = 5.78e-07

T90 vs. Hardness ratio plot

T90                                   = 42 sec.
Hardness ratio (energy fluence ratio) = 1.18443

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.71536
Count Ratio (50-100 keV) / (15-25 keV) = 0.475406

Mask shadow pattern

IMX = -2.451129535055485E-01, IMY = 4.124330246909272E-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:
-10.880000 -4.880000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5861 -40.6655  115.8  42.9  144.9  -0.0522  -0.1    7.1	Vela X-1                      
170.1180 -60.6335   19.3  37.0 -170.1  -0.1474  -0.6    5.9	Cen X-3                       
186.3827 -62.8926    0.0  39.2 -157.6   0.2185   0.8   10.5	GX 301-2                      
 33.3267 -25.4672    2.3  50.1   15.0   2.0651   4.9 ------	UNKNOWN                       
 26.3453 -23.5903    2.8  53.8    8.0   2.1050   4.1 ------	UNKNOWN                       
355.1819 -38.1261    2.6  50.5  -30.3   2.2371   4.4 ------	UNKNOWN                       
202.7558 -46.9072    2.6  57.5 -154.7   4.1733   4.5 ------	UNKNOWN                       
227.2323 -59.5341    3.4  49.2 -133.1   2.8941   3.4 ------	UNKNOWN

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

Time interval of the image:
-4.880000 17.500000
19.120000 36.620600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5548 -40.5417    7.7  43.0  144.8   3.0759   1.5    1.4	Vela X-1                      
170.3115 -60.6268   16.6  37.1 -169.9  -0.6864  -0.7    0.3	Cen X-3                       
186.6589 -62.7674 2515.8  39.4 -157.5  -0.0039  -0.0    0.2	GX 301-2                      
 10.6244 -39.3207    2.5  44.1  -16.3   5.2497   4.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

Plot creation:
Sun Jan  3 12:47:03 EST 2021