batgrbproduct analysis for trigger=993768
batgrbproduct Analysis for Trigger=993768
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 Aug 30 13:55:31 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger993768/GCN5_download_cron
======================================================================
Trigger: 00993768 Segment: 000
BAT Trigger Time: 620402400 [s; MET]
Trigger Stop: 620402464 [s; MET]
UTC: 2020-08-29T13:59:34.457300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 251.212254438923 Dec: 72.3352684295848 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.74
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.74
Flight Position: [ source = BAT ]
RA: 251.212254438923 Dec: 72.3352684295848 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.13638799786 Dec: 72.3626619338733 [deg; J2000]
{ 16h 44m 32.7s , +72d 21' 45.6" }
+/- 1.84468240853877 [arcmin] (estimated 90% radius based on SNR)
+/- 0.979874032252005 [arcmin] (formal 1-sigma fit error)
SNR: 12.6832446898669
Angular difference between Flight and Ground position is 2.146285 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 13.039999961853 +/- 2.9117637191558
Measured from: -62.6679998636246
to: -49.6279999017715 [s; relative to TRIGTIME]
T50: 2.67999994754791 +/- 0.0521536426475384
Measured from: -60.5239999294281
to: -57.8439999818802 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -60.067999958992
to: -59.067999958992 [s; relative to TRIGTIME]
Total Fluence
Measured from: -74.7680000066757
to: 204.18799996376 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.160666 20.271536 24.339994 10.105772
0.142002 0.165170 0.171252 0.155013 [error]
Peak 1.603923 3.637992 5.378613 2.424455
0.033349 0.049215 0.061056 0.049907 [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 3.02e-06 8.37e-06 1.88e-05 1.13e-04 5.07e-05 1.43e-04 erg/cm2
Error 1.02e-07 1.68e-07 2.40e-07 3.62e-06 6.52e-07 3.62e-06 erg/cm2
Peak flux Power-law 1.43e+01 2.52e+01 3.40e+01 9.47e+01 9.87e+01 1.68e+02 ph/cm2/s
Error 5.84e-01 6.25e-01 5.55e-01 3.53e+00 1.65e+00 3.53e+00 ph/cm2/s
Fluence Cutoff-PL 3.02e-06 8.39e-06 1.88e-05 1.11e-04 5.07e-05 1.42e-04 erg/cm2
Error 1.03e-07 1.69e-07 2.42e-07 -------- 6.56e-07 4.14e-06 erg/cm2
Peak flux Cutoff-PL 1.37e+01 2.51e+01 3.45e+01 8.59e+01 9.83e+01 1.59e+02 ph/cm2/s
Error 8.38e-01 6.35e-01 7.20e-01 9.20e+00 1.69e+00 9.27e+00 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 0.832 0.026 - - 1.58e-02 2.35e-04 32.560 57
CPL 0.823 0.026 9998.6 0.0 1.59e-02 2.40e-04 33.300 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.565 0.031 - - 8.41e-01 1.54e-02 42.690 57
CPL 0.453 0.111 926.4 0.0 9.27e-01 0.00e+00 40.230 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: 7.424000 sec.
T50 in the 50-300 keV band: 2.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 278.956 -74.768 204.188
T90 13.040 -62.668 -49.628
T50 2.680 -60.524 -57.844
Peak 1.000 -60.068 -59.068
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.1364 +72.3627 0.0152 22.7 -33.4 1.8894 12.7 TRIG_00993768
------------------------------------------
Foreground time interval of the image:
-12.499 70.601 (delta_t = 83.100 [sec])
Background time interval of the image:
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
-74.768000 171.240000
172.000000 204.188000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.832101 ( -0.0256204 0.0254901 )
Norm@50keV : 1.58171E-02 ( -0.000235608 0.000234087 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.56 using 59 PHA bins.
# Reduced chi-squared = 0.5712 for 57 degrees of freedom
# Null hypothesis probability = 9.962007e-01
Photon flux (15-150 keV) in 278.2 sec: 1.81624 ( -0.0264019 0.0265007 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.07409e-05 ( -6.51753e-07 6.51806e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-74.768000 171.240000
172.000000 204.188000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.823151 ( -0.0249908 0.0265875 )
Epeak [keV] : 9998.65 ( -9998.85 -9998.85 )
Norm@50keV : 1.59184E-02 ( -0.000208546 0.000271014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.30 using 59 PHA bins.
# Reduced chi-squared = 0.5947 for 56 degrees of freedom
# Null hypothesis probability = 9.931646e-01
Photon flux (15-150 keV) in 278.2 sec: 1.81533 ( -0.02641 0.02646 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.07492e-05 ( -6.42086e-07 6.70184e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-74.768000 171.240000
172.000000 204.188000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.791387 ( 0.791364 0.791364 )
beta : -0.832101 ( -0.0254895 0.0256214 )
Epeak [keV] : 13.4399 ( -13.4398 -13.4398 )
Norm@50keV : 2.46018E-02 ( -0.00865487 322106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.56 using 59 PHA bins.
# Reduced chi-squared = 0.5920 for 55 degrees of freedom
# Null hypothesis probability = 9.930984e-01
Photon flux (15-150 keV) in 278.2 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] : 29.4007 ( )
R^2/D10^2 : 2.79964E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 925.97 using 59 PHA bins.
# Reduced chi-squared = 16.245 for 57 degrees of freedom
# Null hypothesis probability = 3.154203e-157
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.066e-06 3.241e-08
25- 50 6.523e-06 1.391e-07
50-150 4.013e-05 6.538e-07
15-150 4.772e-05 6.677e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 8.08004 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 2536.43 using 59 PHA bins.
# Reduced chi-squared = 44.4988 for 57 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.597e-06 8.346e-08
25- 50 1.077e-05 1.544e-07
50-150 2.361e-05 3.533e-07
15-150 3.998e-05 5.981e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.92869 (-0.587039 0.631761)
R1^2/D10^2 : 0.554836 (-0.109396 0.141347)
kT2 [keV] : 44.3932 (-2.33422 2.79549)
R2^2/D10^2 : 7.69580E-03 (-0.00121255 0.00129109)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.01 using 59 PHA bins.
# Reduced chi-squared = 0.5274 for 55 degrees of freedom
# Null hypothesis probability = 9.984919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.890e-06 1.715e-07
25- 50 8.549e-06 2.448e-07
50-150 4.010e-05 8.624e-07
15-150 5.154e-05 9.598e-07
Peak spectrum fit
Power-law model
Time interval is from -60.068 sec. to -59.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.565354 ( -0.030917 0.0307306 )
Norm@50keV : 0.841282 ( -0.0154817 0.0154011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.69 using 59 PHA bins.
# Reduced chi-squared = 0.7489 for 57 degrees of freedom
# Null hypothesis probability = 9.205290e-01
Photon flux (15-150 keV) in 1 sec: 98.6642 ( -1.65195 1.65253 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09404e-05 ( -1.89439e-07 1.89512e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -60.068 sec. to -59.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.452669 ( -0.125726 0.0960923 )
Epeak [keV] : 926.395 ( )
Norm@50keV : 0.926644 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.23 using 59 PHA bins.
# Reduced chi-squared = 0.7184 for 56 degrees of freedom
# Null hypothesis probability = 9.445304e-01
Photon flux (15-150 keV) in 1 sec: 98.3249 ( -1.6861 1.6881 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09384e-05 ( 0 0 ) ergs/cm2
Band function
Time interval is from -60.068 sec. to -59.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.880875 ( 0.880875 0.880875 )
beta : -0.565348 ( -0.0307355 0.0309121 )
Epeak [keV] : 15.5871 ( -15.5871 -15.5871 )
Norm@50keV : 1.19703 ( -0.334866 1.11129e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.69 using 59 PHA bins.
# Reduced chi-squared = 0.7762 for 55 degrees of freedom
# Null hypothesis probability = 8.868840e-01
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] : 32.3950 ( )
R^2/D10^2 : 1.28221 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 394.25 using 59 PHA bins.
# Reduced chi-squared = 6.9166 for 57 degrees of freedom
# Null hypothesis probability = 6.334015e-52
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.006e-07 7.050e-09
25- 50 1.275e-06 3.350e-08
50-150 9.136e-06 1.945e-07
15-150 1.061e-05 1.950e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 367.043 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 2665.51 using 59 PHA bins.
# Reduced chi-squared = 46.7634 for 57 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.140e-07 1.755e-08
25- 50 1.758e-06 3.300e-08
50-150 3.856e-06 7.000e-08
15-150 6.528e-06 1.310e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.38145 (-0.929078 1.04512)
R1^2/D10^2 : 17.8615 (-4.62427 6.58565)
kT2 [keV] : 46.5131 (-3.04519 3.88052)
R2^2/D10^2 : 0.441481 (-0.0855076 0.0899624)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 29.43 using 59 PHA bins.
# Reduced chi-squared = 0.5351 for 55 degrees of freedom
# Null hypothesis probability = 9.981569e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.225e-07 3.290e-08
25- 50 1.490e-06 6.500e-08
50-150 9.199e-06 2.835e-07
15-150 1.111e-05 3.300e-07
Plot creation:
Sun Aug 30 14:00:46 EDT 2020