batgrbproduct analysis for trigger=971846
batgrbproduct Analysis for Trigger=971846
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): Wed May 13 14:20:24 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger971846/GCN5_download_cron
======================================================================
Trigger: 00971846 Segment: 000
BAT Trigger Time: 611008420.864 [s; MET]
Trigger Stop: 611008424.96 [s; MET]
UTC: 2020-05-12T20:33:15.934300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 7.39573675700765 Dec: -2.1987561754583 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.66
Image Trigger?: NO
Rate S/N Ratio: 8.60232526704263 [ if not an image trigger ]
Image S/N Ratio: 7.66
Flight Position: [ source = BAT ]
RA: 7.39573675700765 Dec: -2.1987561754583 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 7.41747981904924 Dec: -2.21696965411524 [deg; J2000]
{ 00h 29m 40.2s , -02d 13' 01.1" }
+/- 1.4788859995373 [arcmin] (estimated 90% radius based on SNR)
+/- 0.649624828433069 [arcmin] (formal 1-sigma fit error)
SNR: 17.3922002185818
Angular difference between Flight and Ground position is 1.701071 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 74 +/- 14.3178210632764
Measured from: -0.863999843597412
to: 73.1360001564026 [s; relative to TRIGTIME]
T50: 26 +/- 8.24621125123532
Measured from: 5.13600015640259
to: 31.1360001564026 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.1360000371933
to: 4.1360000371933 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.8639999628067
to: 78.1360000371933 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.487748 0.547897 0.338467 0.100977
0.047352 0.048793 0.042820 0.037695 [error]
Peak 0.013921 0.021149 0.011555 0.009988
0.005237 0.005567 0.004921 0.004219 [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 1.32e-07 2.16e-07 2.70e-07 6.66e-07 8.05e-07 1.28e-06 erg/cm2
Error 2.00e-08 2.12e-08 4.08e-08 2.08e-07 9.53e-08 2.46e-07 erg/cm2
Peak flux Power-law 1.15e-01 1.28e-01 1.02e-01 1.35e-01 3.96e-01 4.81e-01 ph/cm2/s
Error 5.92e-02 4.27e-02 3.83e-02 1.07e-01 1.21e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 1.26e-07 2.27e-07 2.70e-07 3.35e-07 7.71e-07 9.58e-07 erg/cm2
Error 2.28e-08 2.87e-08 4.38e-08 3.31e-07 1.12e-07 3.36e-07 erg/cm2
Peak flux Cutoff-PL 1.08e-01 1.51e-01 9.69e-02 2.58e-02 3.76e-01 3.80e-01 ph/cm2/s
Error 8.91e-02 8.01e-02 -------- 1.34e-01 1.45e-01 2.02e-01 ph/cm2/s
Fluence Band 1.23e-07 2.30e-07 2.64e-07 4.60e-07 7.71e-07 1.08e-06 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 1.683 0.179 - - 1.07e-03 1.19e-04 71.290 57
CPL 1.281 0.611 80.2 -23.2 1.78e-03 0.00e+00 70.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.326 0.527 - - 3.30e-03 1.02e-03 68.300 57
CPL -1.847 5.065 46.0 -17.3 2.76e-01 5.23e+02 68.270 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: 16.512000 sec.
T50 in the 50-300 keV band: 8.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 81.000 -2.864 78.136
T90 74.000 -0.864 73.136
T50 26.000 5.136 31.136
Peak 1.000 3.136 4.136
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
7.4175 -2.2170 0.0110 5.5 -120.3 1.1304 17.4 TRIG_00971846
------------------------------------------
Foreground time interval of the image:
-2.864 35.837 (delta_t = 38.701 [sec])
Background time interval of the image:
-239.864 -48.074 (delta_t = 191.790 [sec])
-46.864 -2.864 (delta_t = 44.000 [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
Time interval is from -2.864 sec. to 78.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68324 ( -0.176785 0.182063 )
Norm@50keV : 1.07210E-03 ( -0.000119595 0.000117626 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.29 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.652533e-02
Photon flux (15-150 keV) in 81 sec: 0.141562 ( -0.0138987 0.0139032 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.05155e-07 ( -9.44808e-08 9.62061e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.864 sec. to 78.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28106 ( -0.858708 0.36387 )
Epeak [keV] : 80.2419 ( -33.7883 -80.2515 )
Norm@50keV : 1.78400E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.41 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 56 degrees of freedom
# Null hypothesis probability = 9.319434e-02
Photon flux (15-150 keV) in 81 sec: 0.139021 ( -0.014692 0.014614 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.71092e-07 ( -1.11276e-07 1.1338e-07 ) ergs/cm2
Band function
Time interval is from -2.864 sec. to 78.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09790 ( 1.09884 1.09884 )
beta : -2.05082 ( 2.04903 0.495743 )
Epeak [keV] : 65.3592 ( -65.5371 350.767 )
Norm@50keV : 2.29884E-03 ( -0.00128598 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.04 using 59 PHA bins.
# Reduced chi-squared = 1.273 for 55 degrees of freedom
# Null hypothesis probability = 8.331442e-02
Photon flux (15-150 keV) in 81 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.70737e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1498 (-1.39069 1.59537)
R^2/D10^2 : 3.28812E-02 (-0.0118842 0.018323)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.90 using 59 PHA bins.
# Reduced chi-squared = 1.560 for 57 degrees of freedom
# Null hypothesis probability = 4.363743e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.324e-08 1.430e-08
25- 50 2.658e-07 3.532e-08
50-150 2.378e-07 5.459e-08
15-150 5.869e-07 7.225e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 133.344 (-48.3244 -131.634)
Norm : 0.589271 (-0.0626921 0.0868786)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.43 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 57 degrees of freedom
# Null hypothesis probability = 1.090214e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.237e-07 1.709e-08
25- 50 2.251e-07 5.079e-08
50-150 4.223e-07 2.185e-07
15-150 7.711e-07 2.909e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.66628 (-2.31456 4.19165)
R1^2/D10^2 : 0.302137 (-0.233404 2.13906)
kT2 [keV] : 18.9681 (-4.89506 52.0189)
R2^2/D10^2 : 5.11716E-03 (-0.00490755 0.00519837)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.33 using 59 PHA bins.
# Reduced chi-squared = 1.315 for 55 degrees of freedom
# Null hypothesis probability = 5.855499e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.250e-07 6.283e-08
25- 50 2.250e-07 1.096e-07
50-150 3.785e-07 2.048e-07
15-150 7.285e-07 3.350e-07
Peak spectrum fit
Power-law model
Time interval is from 3.136 sec. to 4.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32626 ( -0.538693 0.514472 )
Norm@50keV : 3.29930E-03 ( -0.00102082 0.0010109 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.30 using 59 PHA bins.
# Reduced chi-squared = 1.198 for 57 degrees of freedom
# Null hypothesis probability = 1.453318e-01
Photon flux (15-150 keV) in 1 sec: 0.395582 ( -0.120626 0.120829 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.23998e-08 ( -1.10085e-08 1.14461e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.136 sec. to 4.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.84670 ( -6.4802 3.64908 )
Epeak [keV] : 46.0278 ( -11.6207 -46.1908 )
Norm@50keV : 0.276215 ( -0.254209 1045.92 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.27 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 56 degrees of freedom
# Null hypothesis probability = 1.258907e-01
Photon flux (15-150 keV) in 1 sec: 0.375960 0.347418 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07373e-08 ( -1.72211e-08 1.30611e-08 ) ergs/cm2
Band function
Time interval is from 3.136 sec. to 4.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.94601 -4.94601 )
beta : -1.69002 ( -3.84567 0.692258 )
Epeak [keV] : 29.6049 ( -29.605 15.3285 )
Norm@50keV : 127.438 ( -37.198 1.36521e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.14 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 55 degrees of freedom
# Null hypothesis probability = 1.443761e-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] : 12.0487 (-3.09841 5.0755)
R^2/D10^2 : 0.101953 (-0.101955 0.192026)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.35 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.443598e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.131e-09 1.977e-09
25- 50 9.902e-09 6.080e-09
50-150 8.667e-09 6.380e-09
15-150 2.170e-08 1.366e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 1.62609 (-0.494079 0.494079)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.60 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 57 degrees of freedom
# Null hypothesis probability = 1.395582e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.049e-09 2.547e-09
25- 50 7.789e-09 4.732e-09
50-150 1.708e-08 1.047e-08
15-150 2.892e-08 1.751e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 6.28022E-05 (-4.41009e-05 0.00053775)
kT2 [keV] : 10.0067 (-2.66218 3.81549)
R2^2/D10^2 : 0.169329 (-0.10987 0.365675)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.19 using 59 PHA bins.
#Fit statistic : Chi-Squared = 63.89 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 55 degrees of freedom
# Reduced chi-squared = 1.162 for 55 degrees of freedom
# Null hypothesis probability = 1.856019e-01
# Null hypothesis probability = 1.924209e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.514e-09 2.127e-09
25- 50 9.167e-09 5.705e-09
50-150 1.749e-08 4.925e-09
15-150 3.017e-08 1.305e-08
Plot creation:
Wed May 13 14:24:11 EDT 2020