batgrbproduct analysis for trigger=965484
batgrbproduct Analysis for Trigger=965484
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): Fri Apr 10 07:01:26 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger965484/GCN5_download_cron
======================================================================
Trigger: 00965484 Segment: 000
BAT Trigger Time: 608095224.512 [s; MET]
Trigger Stop: 608095225.024 [s; MET]
UTC: 2020-04-09T03:19:59.771640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 60.5532477609483 Dec: -50.2471522412378 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.58
Image Trigger?: NO
Rate S/N Ratio: 16.5529453572468 [ if not an image trigger ]
Image S/N Ratio: 7.58
Flight Position: [ source = BAT ]
RA: 60.5532477609483 Dec: -50.2471522412378 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 60.5552729294316 Dec: -50.2434348083451 [deg; J2000]
{ 04h 02m 13.3s , -50d 14' 36.4" }
+/- 2.67578833944435 [arcmin] (estimated 90% radius based on SNR)
+/- 1.44749228610829 [arcmin] (formal 1-sigma fit error)
SNR: 7.45543542747869
Angular difference between Flight and Ground position is 0.236194 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 17.9119999408722 +/- 5.20353878073501
Measured from: 0.176000118255615
to: 18.0880000591278 [s; relative to TRIGTIME]
T50: 11.6119999885559 +/- 5.14392694692367
Measured from: 0.684000134468079
to: 12.296000123024 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.00800001621246338
to: 1.00800001621246 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00800001621246338
to: 19.0080000162125 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.217924 0.156776 0.074108 0.035182
0.032442 0.033449 0.029030 0.025872 [error]
Peak 0.030356 0.063787 0.049260 0.009428
0.008190 0.008845 0.007855 0.006239 [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 5.79e-08 7.21e-08 6.53e-08 1.03e-07 2.31e-07 2.98e-07 erg/cm2
Error 1.48e-08 1.55e-08 2.77e-08 8.65e-08 6.23e-08 1.20e-07 erg/cm2
Peak flux Power-law 3.79e-01 3.99e-01 2.98e-01 3.59e-01 1.21e+00 1.44e+00 ph/cm2/s
Error 1.01e-01 6.89e-02 6.11e-02 1.46e-01 2.00e-01 2.43e-01 ph/cm2/s
Fluence Cutoff-PL 5.77e-08 7.22e-08 6.57e-08 1.03e-07 2.31e-07 2.99e-07 erg/cm2
Error 1.48e-08 1.60e-08 2.76e-08 9.00e-08 6.34e-08 1.01e-07 erg/cm2
Peak flux Cutoff-PL 3.09e-01 4.45e-01 3.27e-01 1.25e-01 1.17e+00 1.21e+00 ph/cm2/s
Error 1.22e-01 8.67e-02 7.40e-02 1.75e-01 2.06e-01 2.51e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.23e-01 4.35e-01 3.26e-01 1.60e-01 1.19e+00 1.25e+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 2.142 0.436 - - 1.30e-03 3.98e-04 44.340 57
CPL 2.615 0.847 211.7 0.0 7.40e-04 0.00e+00 43.740 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.424 0.264 - - 9.91e-03 1.66e-03 39.120 57
CPL 0.262 1.320 75.0 186.0 3.83e-02 1.04e-01 35.950 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: 0.704000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.000 0.008 19.008
T90 17.912 0.176 18.088
T50 11.612 0.684 12.296
Peak 1.000 0.008 1.008
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
60.5553 -50.2434 0.0259 19.5 -69.3 0.4540 7.5 TRIG_00965484
------------------------------------------
Foreground time interval of the image:
0.008 16.789 (delta_t = 16.781 [sec])
Background time interval of the image:
-239.512 -57.267 (delta_t = 182.245 [sec])
-56.512 0.008 (delta_t = 56.520 [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 0.008 sec. to 19.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14239 ( -0.404316 0.467069 )
Norm@50keV : 1.30051E-03 ( -0.000407872 0.000388879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.34 using 59 PHA bins.
# Reduced chi-squared = 0.7778 for 57 degrees of freedom
# Null hypothesis probability = 8.894570e-01
Photon flux (15-150 keV) in 19 sec: 0.208991 ( -0.0410711 0.0411042 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.30614e-07 ( -6.0142e-08 6.44446e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 19.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.61515 ( -1.41873 0.275167 )
Epeak [keV] : 211.727 ( )
Norm@50keV : 7.40350E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.74 using 59 PHA bins.
# Reduced chi-squared = 0.7810 for 56 degrees of freedom
# Null hypothesis probability = 8.833252e-01
Photon flux (15-150 keV) in 19 sec: 0.208462 ( -0.040764 0.040827 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31219e-07 ( -6.45856e-08 6.2168e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 19.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.85968 ( -4.85968 -4.85968 )
beta : -2.22646 ( -0.908381 0.453316 )
Epeak [keV] : 18.6023 ( -18.6023 7.30948 )
Norm@50keV : 1337.70 ( -261.119 3.19276e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.16 using 59 PHA bins.
# Reduced chi-squared = 0.8029 for 55 degrees of freedom
# Null hypothesis probability = 8.521198e-01
Photon flux (15-150 keV) in 19 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] : 7.02526 (-1.5877 2.10969)
R^2/D10^2 : 0.374902 (-0.24294 0.6973)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.28 using 59 PHA bins.
# Reduced chi-squared = 0.8996 for 57 degrees of freedom
# Null hypothesis probability = 6.885905e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.669e-08 2.630e-08
25- 50 7.818e-08 3.271e-08
50-150 1.312e-08 8.814e-09
15-150 1.480e-07 5.614e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.6598 (-22.2863 66.9896)
Norm : 1.21799 (-0.401909 0.744138)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.13 using 59 PHA bins.
# Reduced chi-squared = 0.8093 for 57 degrees of freedom
# Null hypothesis probability = 8.478785e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.564e-08 1.561e-08
25- 50 7.790e-08 2.486e-08
50-150 7.075e-08 4.490e-08
15-150 2.043e-07 8.183e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.79851 (-1.55831 1.87076)
R1^2/D10^2 : 0.746136 (-0.502384 0.749348)
kT2 [keV] : 53.2970 (-35.8078 -53.3235)
R2^2/D10^2 : 2.61680E-04 (-0.000243183 0.00185631)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.03 using 59 PHA bins.
# Reduced chi-squared = 0.7643 for 55 degrees of freedom
# Null hypothesis probability = 9.005011e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.167e-08 3.466e-08
25- 50 6.643e-08 3.809e-08
50-150 1.439e-07 8.505e-08
15-150 2.720e-07 1.334e-07
Peak spectrum fit
Power-law model
Time interval is from 0.008 sec. to 1.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42366 ( -0.262332 0.266491 )
Norm@50keV : 9.91284E-03 ( -0.00166832 0.00165642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.12 using 59 PHA bins.
# Reduced chi-squared = 0.6864 for 57 degrees of freedom
# Null hypothesis probability = 9.660984e-01
Photon flux (15-150 keV) in 1 sec: 1.21384 ( -0.199799 0.200002 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.53357e-08 ( -1.75678e-08 1.78555e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 1.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.262314 ( -1.52189 1.11759 )
Epeak [keV] : 74.9720 ( -20.2397 351.77 )
Norm@50keV : 3.82734E-02 ( -0.0382733 0.170648 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.95 using 59 PHA bins.
# Reduced chi-squared = 0.6419 for 56 degrees of freedom
# Null hypothesis probability = 9.829663e-01
Photon flux (15-150 keV) in 1 sec: 1.17012 ( -0.205853 0.20522 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.89502e-08 ( -1.82517e-08 1.89708e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 1.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.262069 ( -0.857573 1.8498 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 74.9526 ( -19.9997 265.732 )
Norm@50keV : 3.82877E-02 ( -0.0382874 0.171514 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.95 using 59 PHA bins.
# Reduced chi-squared = 0.6536 for 55 degrees of freedom
# Null hypothesis probability = 9.781507e-01
Photon flux (15-150 keV) in 1 sec: 1.18748 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.16611e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.6905 (-2.64907 3.25658)
R^2/D10^2 : 0.126252 (-0.06085 0.112802)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.20 using 59 PHA bins.
# Reduced chi-squared = 0.6878 for 57 degrees of freedom
# Null hypothesis probability = 9.653737e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.454e-09 2.182e-09
25- 50 2.670e-08 6.600e-09
50-150 4.560e-08 1.534e-08
15-150 7.875e-08 2.123e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.358 (-85.7679 -199.362)
Norm : 5.02205 (-0.81506 0.816215)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.29 using 59 PHA bins.
# Reduced chi-squared = 0.6718 for 57 degrees of freedom
# Null hypothesis probability = 9.730341e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.251e-08 7.235e-09
25- 50 2.406e-08 1.360e-08
50-150 5.276e-08 3.030e-08
15-150 8.932e-08 5.095e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.15094 (-3.20522 8.76025)
R1^2/D10^2 : 2.29912 (-2.18442 272.899)
kT2 [keV] : 18.9523 (-4.31589 37.6978)
R2^2/D10^2 : 5.84187E-02 (-0.0577196 0.0729975)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.41 using 59 PHA bins.
# Reduced chi-squared = 0.6438 for 55 degrees of freedom
# Null hypothesis probability = 9.814869e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.042e-08 5.720e-09
25- 50 2.424e-08 1.256e-08
50-150 5.250e-08 3.024e-08
15-150 8.716e-08 4.648e-08
Plot creation:
Fri Apr 10 07:06:40 EDT 2020