batgrbproduct analysis for trigger=1015873
batgrbproduct Analysis for Trigger=1015873
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): Mon Jan 4 17:21:24 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1015873/GCN5_download_cron
======================================================================
Trigger: 01015873 Segment: 000
BAT Trigger Time: 631452445.376 [s; MET]
Trigger Stop: 631452445.888 [s; MET]
UTC: 2021-01-04T11:26:59.104760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 103.704701121309 Dec: 64.6607065720299 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.4
Image Trigger?: NO
Rate S/N Ratio: 23.388031127053 [ if not an image trigger ]
Image S/N Ratio: 11.4
Flight Position: [ source = BAT ]
RA: 103.704701121309 Dec: 64.6607065720299 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 103.770571310846 Dec: 64.6751572077874 [deg; J2000]
{ 06h 55m 04.9s , +64d 40' 30.6" }
+/- 0.670631611532342 [arcmin] (estimated 90% radius based on SNR)
+/- 0.22438524270835 [arcmin] (formal 1-sigma fit error)
SNR: 53.8267737659954
Angular difference between Flight and Ground position is 1.900332 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 32.055999994278 +/- 0.492146305544503
Measured from: 1.51220011711121
to: 33.5682001113892 [s; relative to TRIGTIME]
T50: 17.1720000505447 +/- 1.38351429913752
Measured from: 11.2202000617981
to: 28.3922001123428 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 26.7761999368668
to: 27.7761999368668 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.999800086021423
to: 45.3881999254227 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.973780 5.340188 3.872657 0.972603
0.057759 0.062512 0.054756 0.040494 [error]
Peak 0.350992 0.569742 0.443966 0.112577
0.012533 0.014831 0.014084 0.008919 [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 1.24e-06 2.21e-06 3.03e-06 8.58e-06 8.75e-06 1.51e-05 erg/cm2
Error 4.84e-08 4.93e-08 6.31e-08 4.25e-07 1.58e-07 4.47e-07 erg/cm2
Peak flux Power-law 3.67e+00 3.95e+00 3.02e+00 3.76e+00 1.21e+01 1.44e+01 ph/cm2/s
Error 2.25e-01 1.45e-01 1.17e-01 3.08e-01 4.05e-01 4.69e-01 ph/cm2/s
Fluence Cutoff-PL 1.21e-06 2.22e-06 3.05e-06 7.69e-06 8.70e-06 1.42e-05 erg/cm2
Error 6.63e-08 5.08e-08 5.53e-08 1.17e-06 1.68e-07 9.86e-07 erg/cm2
Peak flux Cutoff-PL 3.40e+00 4.03e+00 3.12e+00 2.69e+00 1.18e+01 1.32e+01 ph/cm2/s
Error 2.84e-01 1.60e-01 1.38e-01 6.32e-01 4.28e-01 7.81e-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 1.548 0.035 - - 2.00e-02 3.58e-04 42.040 57
CPL 1.460 0.126 354.8 -75.2 2.19e-02 2.71e-03 40.880 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.388 0.057 - - 9.92e-02 3.19e-03 62.010 57
CPL 1.062 0.235 155.7 131.3 1.41e-01 3.57e-02 55.990 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: 31.296000 sec.
T50 in the 50-300 keV band: 18.240000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 46.388 -1.000 45.388
T90 32.056 1.512 33.568
T50 17.172 11.220 28.392
Peak 1.000 26.776 27.776
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
103.7706 +64.6752 0.0036 20.0 -49.8 3.4928 53.8 TRIG_01015873
------------------------------------------
Foreground time interval of the image:
-1.000 9.225 (delta_t = 10.224 [sec])
Background time interval of the image:
-239.376 -1.000 (delta_t = 238.376 [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 -1.000 sec. to 45.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54774 ( -0.0350032 0.0350014 )
Norm@50keV : 2.00192E-02 ( -0.0003585 0.000358447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 42.04 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.31e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 46.39 sec: 2.53267 ( -0.0542887 0.0545215 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.74563e-06 ( -1.58014e-07 1.58061e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.000 sec. to 45.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45995 ( -0.141835 0.109427 )
Epeak [keV] : 354.842 ( -204.379 -354.846 )
Norm@50keV : 2.18564E-02 ( -0.00217607 0.0032383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 40.88 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.35e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 46.39 sec: 2.51176 ( -0.06242 0.03143 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.70184e-06 ( -1.75261e-07 1.61669e-07 ) ergs/cm2
Band function
Time interval is from -1.000 sec. to 45.388 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.08501 ( -0.350781 5.51621 )
beta : -1.59563 ( 1.59579 0.0594598 )
Epeak [keV] : 80.1096 ( -49.3163 115.618 )
Norm@50keV : 3.59970E-02 ( -0.0138958 0.0907504 )
------------------------------------------------------------
Photon flux (15-150 keV) in 46.39 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] : 17.3858 ( )
R^2/D10^2 : 0.160477 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 698.49 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.46e-111 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.554e-07 1.856e-08
25- 50 2.051e-06 5.660e-08
50-150 4.457e-06 1.408e-07
15-150 6.963e-06 1.345e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-5.80559 -200)
Norm : 10.2901 (-0.183342 0.183342)
------------------------------------------------------------
#Fit statistic : Chi-Squared 56.07 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.10e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.189e-06 2.621e-08
25- 50 2.287e-06 5.057e-08
50-150 5.017e-06 1.090e-07
15-150 8.493e-06 1.763e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.34538 (-0.574454 0.59801)
R1^2/D10^2 : 1.43584 (-0.29286 0.394687)
kT2 [keV] : 31.7056 (-2.47658 3.11874)
R2^2/D10^2 : 1.55509E-02 (-0.00429349 0.00523538)
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.31 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.55e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.736e-07 6.077e-08
25- 50 2.316e-06 7.701e-08
50-150 5.282e-06 2.157e-07
15-150 8.572e-06 3.108e-07
Peak spectrum fit
Power-law model
Time interval is from 26.776 sec. to 27.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38802 ( -0.0572905 0.0574377 )
Norm@50keV : 9.92459E-02 ( -0.00319062 0.00318989 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 62.01 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.02e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 12.0538 ( -0.404404 0.404918 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.6136e-07 ( -3.3832e-08 3.39049e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.776 sec. to 27.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06173 ( -0.241498 0.229183 )
Epeak [keV] : 155.676 ( -44.183 218.336 )
Norm@50keV : 0.141290 ( -0.0303358 0.04108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 55.99 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.75e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 11.8444 ( -0.4275 0.4281 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.43371e-07 ( -3.6722e-08 3.6531e-08 ) ergs/cm2
Band function
Time interval is from 26.776 sec. to 27.776 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.398389 ( -0.580174 2.62689 )
beta : -1.52948 ( -0.37215 0.112027 )
Epeak [keV] : 64.0722 ( -38.0509 105.035 )
Norm@50keV : 0.362791 ( -0.229066 20.8075 )
------------------------------------------------------------
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] : 16.8679 ( )
R^2/D10^2 : 0.929871 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 235.31 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.59e-23 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.400e-08 3.270e-09
25- 50 2.374e-07 1.110e-08
50-150 4.811e-07 2.905e-08
15-150 7.725e-07 3.040e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-6.73856 -200)
Norm : 50.0172 (-1.60882 1.60882)
------------------------------------------------------------
#Fit statistic : Chi-Squared 83.12 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.36e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.246e-07 4.700e-09
25- 50 2.396e-07 8.250e-09
50-150 5.256e-07 1.870e-08
15-150 8.898e-07 2.950e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.53430 (-1.06953 1.15842)
R1^2/D10^2 : 5.91602 (-1.8163 2.99455)
kT2 [keV] : 31.2900 (-4.23804 6.7296)
R2^2/D10^2 : 8.74117E-02 (-0.0421018 0.0601161)
------------------------------------------------------------
#Fit statistic : Chi-Squared 58.10 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.62e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.445e-08 1.039e-08
25- 50 2.407e-07 2.055e-08
50-150 6.074e-07 7.130e-08
15-150 9.426e-07 9.545e-08
Plot creation:
Mon Jan 4 17:24:22 EST 2021