batgrbproduct analysis for trigger=1006907
batgrbproduct Analysis for Trigger=1006907
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): Tue Nov 17 19:18:18 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger1006907/GCN5_download_cron
======================================================================
Trigger: 01006907 Segment: 000
BAT Trigger Time: 627260803.904 [s; MET]
Trigger Stop: 627260804.928 [s; MET]
UTC: 2020-11-16T23:06:17.909620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 85.7535530911431 Dec: 25.2606185417606 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.72
Image Trigger?: NO
Rate S/N Ratio: 17.5499287747842 [ if not an image trigger ]
Image S/N Ratio: 9.72
Flight Position: [ source = BAT ]
RA: 85.7535530911431 Dec: 25.2606185417606 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 85.7266680607827 Dec: 25.4047875390505 [deg; J2000]
{ 05h 42m 54.4s , +25d 24' 17.2" }
+/- 2.31735581906266 [arcmin] (estimated 90% radius based on SNR)
+/- 1.22456134471587 [arcmin] (formal 1-sigma fit error)
SNR: 9.15588237287667
Angular difference between Flight and Ground position is 8.772151 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 416 +/- 64
Measured from: -127.90399992466
to: 288.09600007534 [s; relative to TRIGTIME]
T50: 208 +/- 16
Measured from: 16.0960000753403
to: 224.09600007534 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 231.595999956131
to: 232.595999956131 [s; relative to TRIGTIME]
Total Fluence
Measured from: -207.904000043869
to: 288.095999956131 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 102.159715 77.570844 10.327958 0.133116
0.210300 0.198880 0.140087 0.127239 [error]
Peak 0.229832 0.148693 0.013213 -0.004814
0.009766 0.008736 0.006206 0.005622 [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 5.12e-05 2.63e-05 8.35e-06 3.40e-06 8.77e-05 8.92e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 2.39e+00 9.70e-01 2.32e-01 6.73e-02 3.63e+00 3.66e+00 ph/cm2/s
Error 2.07e-01 7.85e-02 3.82e-02 1.93e-02 2.59e-01 2.60e-01 ph/cm2/s
Fluence Cutoff-PL 3.14e-05 3.15e-05 7.41e-06 2.26e-07 7.05e-05 7.05e-05 erg/cm2
Error 1.69e-06 5.94e-07 2.21e-07 3.98e-08 1.98e-06 1.99e-06 erg/cm2
Peak flux Cutoff-PL 2.20e+00 1.15e+00 1.14e-01 1.17e-03 3.47e+00 3.47e+00 ph/cm2/s
Error 2.30e-01 1.02e-01 4.75e-02 2.61e-03 2.64e-01 2.64e-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 3.654 0.000 - - 1.03e-02 0.00e+00 883.620 57
CPL 0.439 0.240 20.3 1.7 6.17e-01 1.88e-01 30.470 56
The chi2 of BB fit is 209.31 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 3.065 0.159 - - 1.26e-02 1.61e-03 90.100 57
CPL 0.380 1.108 18.6 5.9 8.45e-01 3.03e+00 61.600 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: 123.328000 sec.
T50 in the 50-300 keV band: 76.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 496.000 -207.904 288.096
T90 416.000 -127.904 288.096
T50 208.000 16.096 224.096
Peak 1.000 231.596 232.596
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
85.7267 +25.4048 0.0211 0.2 166.4 12.2134 9.2 TRIG_01006907
------------------------------------------
Foreground time interval of the image:
-207.904 -159.404 (delta_t = 48.500 [sec])
-157.904 -28.064 (delta_t = 129.840 [sec])
-26.904 288.096 (delta_t = 315.000 [sec])
Background time interval of the image:
-239.904 -207.904 (delta_t = 32.000 [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
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
Multiple GTIs in the spectrum
tstart tstop
-207.904000 -159.404000
-157.904000 -28.064000
-26.904000 288.096000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.65405 ( )
Norm@50keV : 1.02501E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 883.62 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.37e-148 with 57 degrees of freedom
Photon flux (15-150 keV) in 493.3 sec: 4.70549 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.77073e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-207.904000 -159.404000
-157.904000 -28.064000
-26.904000 288.096000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.439130 ( -0.244123 0.235916 )
Epeak [keV] : 20.2732 ( -1.74446 1.56795 )
Norm@50keV : 0.617078 ( -0.156699 0.218658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 30.47 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.98e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 493.3 sec: 3.42638 ( -0.12612 0.12815 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.05315e-05 ( -1.97419e-06 1.99491e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-207.904000 -159.404000
-157.904000 -28.064000
-26.904000 288.096000
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.435677 ( -0.238052 0.260767 )
beta : -8.26680 ( 8.9912 8.13324 )
Epeak [keV] : 20.2865 ( -1.74288 1.6419 )
Norm@50keV : 0.620214 ( -0.155064 0.241591 )
------------------------------------------------------------
Photon flux (15-150 keV) in 493.3 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] : 7.46033 ( )
R^2/D10^2 : 4.43391 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 209.31 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.92e-19 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.079e-05 6.561e-07
25- 50 3.212e-05 6.018e-07
50-150 6.665e-06 1.875e-07
15-150 5.958e-05 1.258e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5774 (-0.334382 0.344095)
Norm : 51.9769 (-2.20834 2.29228)
------------------------------------------------------------
#Fit statistic : Chi-Squared 78.14 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.30e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.725e-05 1.115e-06
25- 50 3.076e-05 5.821e-07
50-150 8.116e-06 2.393e-07
15-150 7.613e-05 1.505e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.02768 (-0.440252 0.441127)
R1^2/D10^2 : 18.1485 (-4.73216 7.76224)
kT2 [keV] : 9.24576 (-0.46332 0.629637)
R2^2/D10^2 : 0.919027 (-0.368078 0.442696)
------------------------------------------------------------
#Fit statistic : Chi-Squared 26.45 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.00e+00 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.990e-05 2.272e-06
25- 50 3.168e-05 1.702e-06
50-150 7.630e-06 7.054e-07
15-150 6.921e-05 4.144e-06
Peak spectrum fit
Power-law model
Time interval is from 231.596 sec. to 232.596 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.06512 ( -0.15479 0.162402 )
Norm@50keV : 1.25838E-02 ( -0.00159274 0.00162438 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 90.10 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.40e-03 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.62991 ( -0.259293 0.259504 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55898e-07 ( -1.194e-08 1.20649e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 231.596 sec. to 232.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.380254 ( -1.21718 0.997927 )
Epeak [keV] : 18.5864 ( -7.22882 4.48528 )
Norm@50keV : 0.845101 ( -0.84734 5.21765 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 61.60 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.83e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.46612 ( -0.26347 0.26367 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39171e-07 ( -1.0843e-08 1.1147e-08 ) ergs/cm2
Band function
Time interval is from 231.596 sec. to 232.596 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.380069 ( -0.928993 0.453264 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 18.5864 ( -7.21874 3.83189 )
Norm@50keV : 0.845096 ( -0.845084 5.22304 )
------------------------------------------------------------
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] : 5.89298 (-0.390632 0.417729)
R^2/D10^2 : 14.1873 (-3.93335 5.49465)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 69.14 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.30e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.376e-08 6.525e-09
25- 50 6.113e-08 6.065e-09
50-150 5.197e-09 1.596e-09
15-150 1.301e-07 1.090e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.8036 (-2.20465 2.57283)
Norm : 47.5011 (-7.87992 9.67341)
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.22 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.39e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.979e-08 6.260e-09
25- 50 5.820e-08 5.435e-09
50-150 1.568e-08 4.385e-09
15-150 1.437e-07 1.205e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.39659 (-1.09916 0.926023)
R1^2/D10^2 : 36.6600 (-18.0422 64.4398)
kT2 [keV] : 8.86646 (-5.05352 3.56899)
R2^2/D10^2 : 1.10335 (-0.994456 3.53974)
------------------------------------------------------------
#Fit statistic : Chi-Squared 59.78 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.06e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.851e-08 3.566e-08
25- 50 5.906e-08 2.985e-08
50-150 1.318e-08 7.285e-09
15-150 1.408e-07 7.095e-08
Plot creation:
Tue Nov 17 19:20:35 EST 2020