batgrbproduct analysis for trigger=973628
batgrbproduct Analysis for Trigger=973628
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 May 23 14:28:16 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger973628/batgroup_hand_proc
======================================================================
Trigger: 00973628 Segment: 000
BAT Trigger Time: 611840519.104 [s; MET]
Trigger Stop: 611840519.232 [s; MET]
UTC: 2020-05-22T11:41:34.120260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 5.6665227392278 Dec: -0.281632466181719 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.79
Image Trigger?: NO
Rate S/N Ratio: 30.6267856622271 [ if not an image trigger ]
Image S/N Ratio: 9.79
Flight Position: [ source = BAT ]
RA: 5.6665227392278 Dec: -0.281632466181719 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 5.66782439003557 Dec: -0.263856485130308 [deg; J2000]
{ 00h 22m 40.3s , -00d 15' 49.9" }
+/- 1.59272349933067 [arcmin] (estimated 90% radius based on SNR)
+/- 0.642255218385053 [arcmin] (formal 1-sigma fit error)
SNR: 15.6439492161112
Angular difference between Flight and Ground position is 1.069414 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 0.615999937057495 +/- 0.0785875019843526
Measured from: -0.00399994850158691
to: 0.611999988555908 [s; relative to TRIGTIME]
T50: 0.375999927520752 +/- 0.0519999724168052
Measured from: 0.0520000457763672
to: 0.427999973297119 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.169999957084656
to: 0.830000042915344 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0159999132156372
to: 0.672000050544739 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.045601 0.069664 0.051853 0.016226
0.005911 0.006551 0.005889 0.004600 [error]
Peak 0.046536 0.072450 0.053824 0.019442
0.006831 0.007474 0.006629 0.005261 [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 1.41e-08 2.67e-08 3.91e-08 1.22e-07 1.11e-07 2.02e-07 erg/cm2
Error 2.36e-09 2.90e-09 5.41e-09 3.47e-08 1.33e-08 3.94e-08 erg/cm2
Peak flux Power-law 4.62e-01 4.89e-01 3.68e-01 4.48e-01 1.49e+00 1.77e+00 ph/cm2/s
Error 8.67e-02 5.93e-02 5.21e-02 1.26e-01 1.72e-01 2.09e-01 ph/cm2/s
Fluence Cutoff-PL 1.24e-08 2.98e-08 4.12e-08 3.67e-08 1.04e-07 1.20e-07 erg/cm2
Error 2.71e-09 3.81e-09 6.25e-09 -------- 1.43e-08 3.79e-08 erg/cm2
Peak flux Cutoff-PL 4.08e-01 5.35e-01 3.91e-01 1.90e-01 1.46e+00 1.52e+00 ph/cm2/s
Error 9.84e-02 7.46e-02 6.03e-02 1.58e-01 1.74e-01 2.27e-01 ph/cm2/s
Fluence Band 1.20e-08 3.09e-08 3.81e-08 8.19e-08 1.06e-07 1.62e-07 erg/cm2
Error 3.05e-09 -------- 7.73e-09 -------- -------- -------- erg/cm2
Peak flux Band 4.16e-01 5.23e-01 3.92e-01 2.37e-01 1.47e+00 1.57e+00 ph/cm2/s
Error 9.74e-02 -------- 5.78e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.452 0.170 - - 1.68e-02 1.83e-03 38.930 57
CPL 0.535 0.762 77.8 52.6 5.04e-02 0.00e+00 33.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.412 0.183 - - 1.22e-02 1.42e-03 47.540 57
CPL 0.602 0.799 84.1 113.7 3.22e-02 3.72e-02 43.650 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: 0.512000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.688 -0.016 0.672
T90 0.616 -0.004 0.612
T50 0.376 0.052 0.428
Peak 1.000 -0.170 0.830
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
5.6678 -0.2639 0.0123 24.8 170.5 0.1881 15.6 TRIG_00973628
------------------------------------------
Foreground time interval of the image:
-0.016 0.672 (delta_t = 0.688 [sec])
Background time interval of the image:
-239.104 -0.016 (delta_t = 239.088 [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 -0.016 sec. to 0.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45184 ( -0.168983 0.171227 )
Norm@50keV : 1.68135E-02 ( -0.00183456 0.00182433 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.93 using 59 PHA bins.
# Reduced chi-squared = 0.6829 for 57 degrees of freedom
# Null hypothesis probability = 9.678493e-01
Photon flux (15-150 keV) in 0.688 sec: 2.07299 ( -0.219698 0.2198 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10659e-07 ( -1.32613e-08 1.34042e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 0.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.534902 ( -0.829632 0.694608 )
Epeak [keV] : 77.7636 ( -18.3751 86.7387 )
Norm@50keV : 5.04323E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.59 using 59 PHA bins.
# Reduced chi-squared = 0.5998 for 56 degrees of freedom
# Null hypothesis probability = 9.923877e-01
Photon flux (15-150 keV) in 0.688 sec: 2.01885 ( -0.22362 0.22364 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03934e-07 ( -1.42044e-08 1.44177e-08 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 0.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.534690 ( -0.453687 1.26395 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 77.7447 ( -18.3609 86.7257 )
Norm@50keV : 5.04449E-02 ( -0.005244 0.005244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.59 using 59 PHA bins.
# Reduced chi-squared = 0.6107 for 55 degrees of freedom
# Null hypothesis probability = 9.899274e-01
Photon flux (15-150 keV) in 0.688 sec: 2.04017 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05965e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6810 (-1.7851 2.07274)
R^2/D10^2 : 0.266314 (-0.098652 0.15246)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.03 using 59 PHA bins.
# Reduced chi-squared = 0.8076 for 57 degrees of freedom
# Null hypothesis probability = 8.503615e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.295e-09 1.583e-09
25- 50 3.231e-08 4.558e-09
50-150 4.693e-08 1.009e-08
15-150 8.753e-08 1.173e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-62.9333 -200)
Norm : 8.56088 (-0.895777 0.895777)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.80 using 59 PHA bins.
# Reduced chi-squared = 0.6457 for 57 degrees of freedom
# Null hypothesis probability = 9.826757e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.467e-08 8.118e-09
25- 50 2.822e-08 1.219e-08
50-150 6.188e-08 3.369e-08
15-150 1.048e-07 5.221e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.70454 (-2.48788 2.99551)
R1^2/D10^2 : 1.39907 (-0.847405 2.42811)
kT2 [keV] : 24.0885 (-6.13673 15.4738)
R2^2/D10^2 : 3.47547E-02 (-0.0291933 0.0770485)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.09 using 59 PHA bins.
# Reduced chi-squared = 0.5835 for 55 degrees of freedom
# Null hypothesis probability = 9.942427e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.249e-08 6.105e-09
25- 50 3.010e-08 1.565e-08
50-150 6.290e-08 3.407e-08
15-150 1.055e-07 5.460e-08
Peak spectrum fit
Power-law model
Time interval is from -0.170 sec. to 0.830 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41246 ( -0.182888 0.183848 )
Norm@50keV : 1.21961E-02 ( -0.00142297 0.00141713 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.54 using 59 PHA bins.
# Reduced chi-squared = 0.8341 for 57 degrees of freedom
# Null hypothesis probability = 8.096543e-01
Photon flux (15-150 keV) in 1 sec: 1.48951 ( -0.171497 0.17163 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1755e-07 ( -1.5076e-08 1.52367e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.170 sec. to 0.830 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.602442 ( -0.855764 0.74226 )
Epeak [keV] : 84.0906 ( -23.1774 204.317 )
Norm@50keV : 3.22300E-02 ( -0.0181839 0.0563055 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.65 using 59 PHA bins.
# Reduced chi-squared = 0.7794 for 56 degrees of freedom
# Null hypothesis probability = 8.852593e-01
Photon flux (15-150 keV) in 1 sec: 1.45632 ( -0.17399 0.17409 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11001e-07 ( -1.63029e-08 1.6423e-08 ) ergs/cm2
Band function
Time interval is from -0.170 sec. to 0.830 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99145 ( -14.8953 -4.99145 )
beta : -1.69416 ( -0.342398 0.251043 )
Epeak [keV] : 30.4299 ( -6.38783 5.03695 )
Norm@50keV : 390.620 ( -43.7127 1225.48 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.42 using 59 PHA bins.
# Reduced chi-squared = 0.7349 for 55 degrees of freedom
# Null hypothesis probability = 9.294057e-01
Photon flux (15-150 keV) in 1 sec: 1.46999 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13399e-07 ( -1.13392e-07 -1.52937e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.8246 (-2.04908 2.44738)
R^2/D10^2 : 0.184673 (-0.0763249 0.125729)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.06 using 59 PHA bins.
# Reduced chi-squared = 0.9835 for 57 degrees of freedom
# Null hypothesis probability = 5.103758e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.513e-09 1.851e-09
25- 50 3.346e-08 5.850e-09
50-150 4.978e-08 1.220e-08
15-150 9.175e-08 1.439e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-59.3801 -200)
Norm : 6.16447 (-0.699984 0.699984)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.59 using 59 PHA bins.
# Reduced chi-squared = 0.8173 for 57 degrees of freedom
# Null hypothesis probability = 8.360899e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.535e-08 8.595e-09
25- 50 2.953e-08 1.620e-08
50-150 6.476e-08 3.545e-08
15-150 1.097e-07 5.740e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.16785 (-2.15986 2.63919)
R1^2/D10^2 : 0.909362 (-0.508834 1.49413)
kT2 [keV] : 27.6958 (-7.68994 20.559)
R2^2/D10^2 : 1.52605E-02 (-0.013207 0.0383754)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.67 using 59 PHA bins.
# Reduced chi-squared = 0.7395 for 55 degrees of freedom
# Null hypothesis probability = 9.252686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.306e-08 7.230e-09
25- 50 3.165e-08 1.657e-08
50-150 6.939e-08 4.022e-08
15-150 1.141e-07 5.890e-08
Plot creation:
Sat May 23 14:40:02 EDT 2020