batgrbproduct analysis for trigger=965638
batgrbproduct Analysis for Trigger=965638
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): Sat Apr 11 14:16:55 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger965638/GCN5_download_cron
======================================================================
Trigger: 00965638 Segment: 000
BAT Trigger Time: 608178335.168 [s; MET]
Trigger Stop: 608178337.216 [s; MET]
UTC: 2020-04-10T02:25:10.422240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.636573224096 Dec: 51.7634692693049 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.99
Image Trigger?: NO
Rate S/N Ratio: 15.4596248337403 [ if not an image trigger ]
Image S/N Ratio: 7.99
Flight Position: [ source = BAT ]
RA: 299.636573224096 Dec: 51.7634692693049 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.64405254622 Dec: 51.7447010111544 [deg; J2000]
{ 19h 58m 34.6s , +51d 44' 40.9" }
+/- 2.89923133859055 [arcmin] (estimated 90% radius based on SNR)
+/- 1.56912556208699 [arcmin] (formal 1-sigma fit error)
SNR: 6.64835619555596
Angular difference between Flight and Ground position is 1.159855 arcmin
Partial Coding Fraction: 0.5390625 [ including projection effects ]
Duration
T90: 108.751999974251 +/- 40.7286630580873
Measured from: -62.799999833107
to: 45.9520001411438 [s; relative to TRIGTIME]
T50: 36.5760000944138 +/- 22.5767668509287
Measured from: -12.4799998998642
to: 24.0960001945496 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.42799997329712
to: 2.42799997329712 [s; relative to TRIGTIME]
Total Fluence
Measured from: -90.8799999952316
to: 50.6240000724792 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.460672 0.754349 0.496056 0.207095
0.118095 0.118131 0.100822 0.087439 [error]
Peak 0.070252 0.072536 0.043163 0.006488
0.011218 0.011475 0.009688 0.007728 [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 1.51e-07 2.94e-07 4.43e-07 1.44e-06 1.24e-06 2.33e-06 erg/cm2
Error 4.92e-08 5.86e-08 9.48e-08 6.82e-07 2.37e-07 7.43e-07 erg/cm2
Peak flux Power-law 8.47e-01 5.78e-01 2.58e-01 1.60e-01 1.76e+00 1.84e+00 ph/cm2/s
Error 1.97e-01 9.80e-02 7.87e-02 9.17e-02 2.95e-01 3.10e-01 ph/cm2/s
Fluence Cutoff-PL 1.45e-07 3.02e-07 4.52e-07 9.85e-07 1.22e-06 1.88e-06 erg/cm2
Error 4.30e-08 6.86e-08 1.03e-07 1.08e-06 2.52e-07 1.01e-06 erg/cm2
Peak flux Cutoff-PL 8.26e-01 5.97e-01 2.58e-01 1.08e-01 1.75e+00 1.79e+00 ph/cm2/s
Error 2.18e-01 1.25e-01 -------- 1.31e-01 3.02e-01 3.41e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 7.30e-01 5.98e-01 2.88e-01 1.87e-01 1.71e+00 1.80e+00 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 1.409 0.306 - - 9.12e-04 1.62e-04 49.660 57
CPL 1.161 1.291 170.8 0.0 1.22e-03 2.20e-03 49.500 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.164 0.336 - - 1.08e-02 2.50e-03 56.030 57
CPL 1.889 0.849 17.0 0.0 1.57e-02 0.00e+00 55.890 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: 4.096000 sec.
T50 in the 50-300 keV band: 2.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 141.504 -90.880 50.624
T90 108.752 -62.800 45.952
T50 36.576 -12.480 24.096
Peak 1.000 1.428 2.428
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.6441 +51.7447 0.0290 39.2 -178.4 1.8033 6.6 TRIG_00965638
------------------------------------------
Foreground time interval of the image:
-90.880 26.133 (delta_t = 117.013 [sec])
Background time interval of the image:
-239.168 -90.880 (delta_t = 148.288 [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 -90.880 sec. to 50.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40923 ( -0.310795 0.302153 )
Norm@50keV : 9.11661E-04 ( -0.000162487 0.000162298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.66 using 59 PHA bins.
# Reduced chi-squared = 0.8713 for 57 degrees of freedom
# Null hypothesis probability = 7.441078e-01
Photon flux (15-150 keV) in 141.5 sec: 0.111258 ( -0.0208676 0.0209921 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24415e-06 ( -2.35968e-07 2.38109e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -90.880 sec. to 50.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16118 ( -1.26427 1.31745 )
Epeak [keV] : 170.830 ( -170.741 -170.741 )
Norm@50keV : 1.21769E-03 ( -0.000459604 0.00394582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.8839 for 56 degrees of freedom
# Null hypothesis probability = 7.178372e-01
Photon flux (15-150 keV) in 141.5 sec: 0.110268 ( -0.021228 0.021326 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22359e-06 ( -2.54758e-07 2.4862e-07 ) ergs/cm2
Band function
Time interval is from -90.880 sec. to 50.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -14.0121 -5 )
beta : -1.66094 ( -0.527362 0.392013 )
Epeak [keV] : 29.8264 ( -10.3713 19.9639 )
Norm@50keV : 33.0390 ( -5.76716 401.776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.40 using 59 PHA bins.
# Reduced chi-squared = 0.8436 for 55 degrees of freedom
# Null hypothesis probability = 7.890115e-01
Photon flux (15-150 keV) in 141.5 sec: 0.233792 ( ) 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] : 15.5359 (-3.75767 5.33397)
R^2/D10^2 : 1.12042E-02 (-0.00715471 0.0188023)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.28 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.278621e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.961e-08 3.159e-08
25- 50 3.265e-07 1.100e-07
50-150 5.445e-07 1.963e-07
15-150 9.506e-07 2.846e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-86.4088 -199.363)
Norm : 0.464593 (-0.0828678 0.0828614)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.08 using 59 PHA bins.
# Reduced chi-squared = 0.8786 for 57 degrees of freedom
# Null hypothesis probability = 7.302214e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.637e-07 9.523e-08
25- 50 3.149e-07 1.831e-07
50-150 6.906e-07 3.924e-07
15-150 1.169e-06 6.750e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.24594 (-2.40355 3.42489)
R1^2/D10^2 : 7.77294E-02 (-0.0544072 0.107186)
kT2 [keV] : 39.2140 (-33.1741 -38.9688)
R2^2/D10^2 : 3.92392E-04 (-0.000363016 0.00220249)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.52 using 59 PHA bins.
# Reduced chi-squared = 0.8458 for 55 degrees of freedom
# Null hypothesis probability = 7.852696e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.494e-07 8.830e-08
25- 50 3.305e-07 1.823e-07
50-150 7.804e-07 4.547e-07
15-150 1.260e-06 6.359e-07
Peak spectrum fit
Power-law model
Time interval is from 1.428 sec. to 2.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16360 ( -0.315173 0.356599 )
Norm@50keV : 1.08416E-02 ( -0.00255867 0.00244073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 57 degrees of freedom
# Null hypothesis probability = 5.114589e-01
Photon flux (15-150 keV) in 1 sec: 1.76121 ( -0.294907 0.294984 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01442e-07 ( -2.03552e-08 2.09609e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.428 sec. to 2.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88862 ( -1.52556 0.172959 )
Epeak [keV] : 17.0115 ( )
Norm@50keV : 1.56525E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.89 using 59 PHA bins.
# Reduced chi-squared = 0.9980 for 56 degrees of freedom
# Null hypothesis probability = 4.790590e-01
Photon flux (15-150 keV) in 1 sec: 1.74632 ( -0.30281 0.30117 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.92047e-08 ( -2.2133e-08 2.26183e-08 ) ergs/cm2
Band function
Time interval is from 1.428 sec. to 2.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.68452 ( 6.75735 2.68452 )
beta : -2.16360 ( -0.356571 0.315145 )
Epeak [keV] : 50.7836 ( -50.7836 -50.7836 )
Norm@50keV : 1.47352 ( -0.34776 0.331729 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.359746e-01
Photon flux (15-150 keV) in 1 sec: 1.70682 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03407e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.33720 (-1.93739 2.34917)
R^2/D10^2 : 1.03622 (-0.599939 1.5316)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.23 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.122429e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.791e-08 6.097e-09
25- 50 4.027e-08 1.189e-08
50-150 1.717e-08 7.608e-09
15-150 7.535e-08 2.129e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 54.3512 (-20.7733 40.4894)
Norm : 9.62964 (-2.50745 3.62466)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.37 using 59 PHA bins.
# Reduced chi-squared = 0.9889 for 57 degrees of freedom
# Null hypothesis probability = 4.987031e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.377e-08 7.275e-09
25- 50 3.505e-08 1.362e-08
50-150 3.663e-08 2.864e-08
15-150 9.546e-08 5.308e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.67972 (-2.32233 3.62133)
R1^2/D10^2 : 30.5720 (-28.8124 36375.9)
kT2 [keV] : 13.9765 (-4.35868 15.6799)
R2^2/D10^2 : 0.175909 (-0.170127 0.479438)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.41 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.220875e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.554e-08 1.449e-08
25- 50 3.212e-08 1.716e-08
50-150 3.468e-08 2.164e-08
15-150 9.235e-08 4.554e-08
Plot creation:
Sat Apr 11 14:20:26 EDT 2020