batgrbproduct analysis for trigger=985320
batgrbproduct Analysis for Trigger=985320
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 v2.47
Process Start Time (local time): Sun Aug 2 17:58:15 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger985320/GCN5_download_cron
======================================================================
Trigger: 00985320 Segment: 000
BAT Trigger Time: 618005533.008 [s; MET]
Trigger Stop: 618005533.024 [s; MET]
UTC: 2020-08-01T20:11:47.622340 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 281.630174702872 Dec: -2.9903966858513 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.6
Image Trigger?: NO
Rate S/N Ratio: 44.4184646290256 [ if not an image trigger ]
Image S/N Ratio: 10.6
Flight Position: [ source = BAT ]
RA: 281.630174702872 Dec: -2.9903966858513 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 281.633175783828 Dec: -3.00581774901665 [deg; J2000]
{ 18h 46m 32.0s , -03d 00' 20.9" }
+/- 1.960614997596 [arcmin] (estimated 90% radius based on SNR)
+/- 0.912864175029317 [arcmin] (formal 1-sigma fit error)
SNR: 11.6255916726083
Angular difference between Flight and Ground position is 0.942575 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0119999647140503 +/- 0.0056569500071322
Measured from: 1.19209289550781e-07
to: 0.0120000839233398 [s; relative to TRIGTIME]
T50: 0.00799989700317383 +/- 0.004
Measured from: 1.19209289550781e-07
to: 0.00800001621246338 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.491999983787537
to: 0.508000016212463 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0119999647140503 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.019676 0.015343 0.007301 0.000082
0.002665 0.002548 0.001912 0.000751 [error]
Peak 0.034714 0.024515 0.012233 -0.001030
0.008150 0.007787 0.006525 0.005505 [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 5.49e-09 4.01e-09 1.94e-09 1.33e-09 1.21e-08 1.28e-08 erg/cm2
Error 1.08e-09 8.22e-10 6.48e-10 7.37e-10 2.35e-09 2.64e-09 erg/cm2
Peak flux Power-law 3.83e-01 1.66e-01 4.31e-02 1.38e-02 6.01e-01 6.06e-01 ph/cm2/s
Error 1.20e-01 7.00e-02 3.80e-02 2.46e-02 1.76e-01 1.80e-01 ph/cm2/s
Fluence Cutoff-PL 5.59e-09 6.38e-09 1.51e-09 3.73e-11 1.35e-08 1.35e-08 erg/cm2
Error 1.27e-09 1.73e-09 1.51e-09 2.20e-10 3.20e-09 3.20e-09 erg/cm2
Peak flux Cutoff-PL 3.83e-01 1.66e-01 4.30e-02 1.36e-02 5.99e-01 6.06e-01 ph/cm2/s
Error 1.20e-01 8.40e-02 4.42e-02 2.45e-02 1.89e-01 1.89e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.89e-01 1.74e-01 4.51e-02 1.30e-02 6.16e-01 6.23e-01 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 3.047 0.283 - - 8.19e-02 2.21e-02 50.580 57
CPL -2.012 0.000 24.8 0.0 2.45e+02 0.00e+00 39.210 56
The chi2 of BB fit is 39.29 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 2.948 0.846 - - 2.27e-03 1.54e-03 58.190 57
CPL -4.552 0.000 22.2 0.0 9.46e+02 0.00e+00 57.340 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.012 0.000 0.012
T90 0.012 0.000 0.012
T50 0.008 0.000 0.008
Peak 1.000 -0.492 0.508
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
281.6332 -3.0058 0.0165 1.0 149.6 0.0462 11.6 TRIG_00985320
------------------------------------------
Foreground time interval of the image:
0.000 0.012 (delta_t = 0.012 [sec])
Background time interval of the image:
-239.008 0.000 (delta_t = 239.008 [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 0.000 sec. to 0.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.04703 ( -0.25468 0.311982 )
Norm@50keV : 8.18815E-02 ( -0.0224478 0.021709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.8874 for 57 degrees of freedom
# Null hypothesis probability = 7.129220e-01
Photon flux (15-150 keV) in 0.012 sec: 23.3058 ( -4.27469 4.27467 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20689e-08 ( -2.35147e-09 2.35354e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.01170 ( )
Epeak [keV] : 24.7987 ( )
Norm@50keV : 245.316 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.21 using 59 PHA bins.
# Reduced chi-squared = 0.7002 for 56 degrees of freedom
# Null hypothesis probability = 9.568652e-01
Photon flux (15-150 keV) in 0.012 sec: 26.2824 25.8186 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18213e-12 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.62770 ( -5.17427 -4.6277 )
beta : -4.24117 ( -4.25842 0.734405 )
Epeak [keV] : 24.7338 ( -2.99065 3.0794 )
Norm@50keV : 2.31900E+04 ( -3926 105632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.67 using 59 PHA bins.
# Reduced chi-squared = 0.6667 for 55 degrees of freedom
# Null hypothesis probability = 9.729331e-01
Photon flux (15-150 keV) in 0.012 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] : 6.31398 (-0.909099 1.07721)
R^2/D10^2 : 83.6612 (-41.4833 79.3087)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.29 using 59 PHA bins.
# Reduced chi-squared = 0.6894 for 57 degrees of freedom
# Null hypothesis probability = 9.645103e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.702e-09 1.590e-09
25- 50 6.341e-09 1.760e-09
50-150 7.125e-10 4.388e-10
15-150 1.276e-08 3.821e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.1950 (-5.96461 6.5279)
Norm : 264.367 (-70.9752 104.588)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.51 using 59 PHA bins.
# Reduced chi-squared = 0.7106 for 57 degrees of freedom
# Null hypothesis probability = 9.516660e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.685e-09 1.157e-09
25- 50 5.705e-09 1.280e-09
50-150 2.311e-09 1.163e-09
15-150 1.370e-08 3.194e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.78357 (-5.7865 1.30787)
R1^2/D10^2 : 108.679 (-59.1633 194.286)
kT2 [keV] : 14.0751 (-14.0873 -14.0873)
R2^2/D10^2 : 0.585945 (-0.582548 3.69912)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.20 using 59 PHA bins.
# Reduced chi-squared = 0.6764 for 55 degrees of freedom
# Null hypothesis probability = 9.685387e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.782e-09 3.318e-09
25- 50 6.146e-09 3.658e-09
50-150 1.835e-09 1.094e-09
15-150 1.376e-08 7.620e-09
Peak spectrum fit
Power-law model
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.94814 ( -0.700004 0.991315 )
Norm@50keV : 2.26732E-03 ( -0.00141812 0.00166058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.19 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.311902e-01
Photon flux (15-150 keV) in 1 sec: 0.600594 ( -0.175166 0.176481 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66122e-08 ( -9.98115e-09 1.1745e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.55193 ( )
Epeak [keV] : 22.1872 ( )
Norm@50keV : 945.873 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.34 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 56 degrees of freedom
# Null hypothesis probability = 4.250651e-01
Photon flux (15-150 keV) in 1 sec: 0.599192 0.565988 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.5253e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46637 ( -0.532884 1.46637 )
beta : -2.94822 ( -0.992528 0.700167 )
Epeak [keV] : 0.698516 ( -0.698501 9999.27 )
Norm@50keV : 1.23107 ( -1.23107 5.79772e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.19 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.586549e-01
Photon flux (15-150 keV) in 1 sec: 0.616150 ( ) 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] : 5.15099 (-1.21744 1.48895)
R^2/D10^2 : 4.45579 (-4.45558 11.2968)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.43 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.589466e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.219e-08 6.985e-09
25- 50 8.560e-09 5.530e-09
50-150 4.012e-10 4.052e-10
15-150 2.115e-08 1.284e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.3620 (-7.44455 18.6869)
Norm : 9.30017 (-5.27623 14.2374)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.12 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.338265e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.191e-08 6.683e-09
25- 50 8.812e-09 5.750e-09
50-150 1.842e-09 1.785e-09
15-150 2.256e-08 1.438e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.87209 (-1.31134 1.48695)
R1^2/D10^2 : 5.45837 (-5.45676 18.1318)
kT2 [keV] : 30.8360 (-31.2254 -31.2254)
R2^2/D10^2 : 1.48819E-03 (-0.00147446 -0.00147446)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.16 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.312169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.217e-08 6.985e-09
25- 50 8.677e-09 5.090e-09
50-150 9.278e-09 7.175e-09
15-150 3.013e-08 1.560e-08
Plot creation:
Sun Aug 2 18:04:16 EDT 2020