batgrbproduct analysis for trigger=965784
batgrbproduct Analysis for Trigger=965784
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 Apr 12 10:01:27 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger965784/GCN5_download_cron
======================================================================
Trigger: 00965784 Segment: 000
BAT Trigger Time: 608272167.208 [s; MET]
Trigger Stop: 608272167.272 [s; MET]
UTC: 2020-04-11T04:29:02.456120 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 47.6594073722997 Dec: -52.3144792843281 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.06
Image Trigger?: NO
Rate S/N Ratio: 34.9714169000914 [ if not an image trigger ]
Image S/N Ratio: 10.06
Flight Position: [ source = BAT ]
RA: 47.6594073722997 Dec: -52.3144792843281 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 47.6941031097034 Dec: -52.3184087644893 [deg; J2000]
{ 03h 10m 46.6s , -52d 19' 06.3" }
+/- 1.62877091602703 [arcmin] (estimated 90% radius based on SNR)
+/- 0.8864110660548 [arcmin] (formal 1-sigma fit error)
SNR: 15.1516953262241
Angular difference between Flight and Ground position is 1.294226 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.327999949455261 +/- 0.104000054872973
Measured from: -0.111999869346619
to: 0.216000080108643 [s; relative to TRIGTIME]
T50: 0.123999953269958 +/- 0.0282842442734789
Measured from: 0.0240001678466797
to: 0.148000121116638 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.437999963760376
to: 0.562000036239624 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.127999901771545
to: 0.248000025749207 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.026148 0.052572 0.054755 0.017423
0.004862 0.005538 0.005363 0.004247 [error]
Peak 0.030001 0.056486 0.054228 0.020372
0.007081 0.007744 0.007126 0.006087 [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 6.53e-09 1.75e-08 3.78e-08 2.13e-07 1.02e-07 2.75e-07 erg/cm2
Error 1.46e-09 2.40e-09 4.69e-09 5.90e-08 1.27e-08 6.16e-08 erg/cm2
Peak flux Power-law 2.41e-01 3.34e-01 3.41e-01 6.36e-01 1.12e+00 1.55e+00 ph/cm2/s
Error 7.20e-02 6.09e-02 5.41e-02 2.20e-01 1.66e-01 2.55e-01 ph/cm2/s
Fluence Cutoff-PL 5.52e-09 1.88e-08 4.10e-08 7.78e-08 9.73e-08 1.43e-07 erg/cm2
Error 1.72e-09 2.89e-09 5.72e-09 8.44e-08 1.39e-08 8.39e-08 erg/cm2
Peak flux Cutoff-PL 2.28e-01 3.41e-01 3.52e-01 4.67e-01 1.11e+00 1.39e+00 ph/cm2/s
Error 8.35e-02 6.77e-02 6.43e-02 3.25e-01 1.70e-01 3.73e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 0.888 0.187 - - 2.40e-02 2.77e-03 76.210 57
CPL 0.086 0.852 131.3 684.5 5.69e-02 6.18e-02 73.010 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.969 0.254 - - 9.74e-03 1.43e-03 55.670 57
CPL 0.699 0.794 263.1 0.0 1.31e-02 1.61e-02 55.430 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.376 -0.128 0.248
T90 0.328 -0.112 0.216
T50 0.124 0.024 0.148
Peak 1.000 -0.438 0.562
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
47.6941 -52.3184 0.0128 8.3 -161.8 0.1494 15.2 TRIG_00965784
------------------------------------------
Foreground time interval of the image:
-0.128 0.248 (delta_t = 0.376 [sec])
Background time interval of the image:
-239.208 -0.128 (delta_t = 239.080 [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 -0.128 sec. to 0.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.887630 ( -0.191143 0.183766 )
Norm@50keV : 2.40404E-02 ( -0.00277006 0.00276006 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.21 using 59 PHA bins.
# Reduced chi-squared = 1.337 for 57 degrees of freedom
# Null hypothesis probability = 4.550138e-02
Photon flux (15-150 keV) in 0.376 sec: 2.75911 ( -0.317309 0.317701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01934e-07 ( -1.26132e-08 1.27047e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.128 sec. to 0.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 8.60922E-02 ( -0.936694 0.766402 )
Epeak [keV] : 131.328 ( -44.2662 1324.67 )
Norm@50keV : 5.69446E-02 ( -0.0315395 0.0920088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.01 using 59 PHA bins.
# Reduced chi-squared = 1.304 for 56 degrees of freedom
# Null hypothesis probability = 6.303894e-02
Photon flux (15-150 keV) in 0.376 sec: 2.69752 ( -0.32438 0.32396 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.73351e-08 ( -1.40116e-08 1.37939e-08 ) ergs/cm2
Band function
Time interval is from -0.128 sec. to 0.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.75055 -5 )
beta : -1.15110 ( -0.336279 0.251297 )
Epeak [keV] : 36.6785 ( -9.02087 7.71137 )
Norm@50keV : 186.879 ( -20.7676 705.446 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.13 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Null hypothesis probability = 9.527293e-02
Photon flux (15-150 keV) in 0.376 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] : 21.6330 (-3.03629 3.77401)
R^2/D10^2 : 0.108788 (-0.0426725 0.0660286)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.20 using 59 PHA bins.
# Reduced chi-squared = 1.390 for 57 degrees of freedom
# Null hypothesis probability = 2.752002e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.570e-09 7.825e-10
25- 50 1.869e-08 3.476e-09
50-150 6.530e-08 1.284e-08
15-150 8.756e-08 1.498e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-21.7594 -200)
Norm : 10.6501 (-1.30009 1.30009)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 106.63 using 59 PHA bins.
# Reduced chi-squared = 1.8707 for 57 degrees of freedom
# Null hypothesis probability = 7.495150e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.967e-09 5.544e-09
25- 50 1.917e-08 1.054e-08
50-150 4.205e-08 2.331e-08
15-150 7.119e-08 3.929e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.8401 (-6.71196 5.09846)
R1^2/D10^2 : 0.308720 (-0.167476 1.01377)
kT2 [keV] : 70.4587 (-70.5275 -70.5276)
R2^2/D10^2 : 2.65848E-03 (-0.00209145 0.0562807)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.08 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 55 degrees of freedom
# Null hypothesis probability = 7.115772e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.111e-09 2.520e-09
25- 50 2.045e-08 1.030e-08
50-150 7.273e-08 3.710e-08
15-150 9.829e-08 4.689e-08
Peak spectrum fit
Power-law model
Time interval is from -0.438 sec. to 0.562 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.968673 ( -0.260944 0.247469 )
Norm@50keV : 9.73707E-03 ( -0.00143366 0.00142779 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 0.9767 for 57 degrees of freedom
# Null hypothesis probability = 5.249935e-01
Photon flux (15-150 keV) in 1 sec: 1.11943 ( -0.166293 0.166628 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06488e-07 ( -1.69735e-08 1.71399e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.438 sec. to 0.562 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.699161 ( -1.09594 0.491353 )
Epeak [keV] : 263.111 ( -263.122 -263.122 )
Norm@50keV : 1.30624E-02 ( -0.00459189 0.0275613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.43 using 59 PHA bins.
# Reduced chi-squared = 0.9898 for 56 degrees of freedom
# Null hypothesis probability = 4.964764e-01
Photon flux (15-150 keV) in 1 sec: 1.10939 ( -0.170075 0.16997 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04708e-07 ( -1.8567e-08 1.8184e-08 ) ergs/cm2
Band function
Time interval is from -0.438 sec. to 0.562 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91516 ( -4.91516 -4.91516 )
beta : -1.16687 ( -0.363063 0.324025 )
Epeak [keV] : 33.4968 ( -33.4968 8.85255 )
Norm@50keV : 114.426 ( -16.4358 1.48689e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.27 using 59 PHA bins.
# Reduced chi-squared = 0.9686 for 55 degrees of freedom
# Null hypothesis probability = 5.408597e-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] : 21.4355 (-4.10809 5.5658)
R^2/D10^2 : 4.34562E-02 (-0.0221843 0.0420121)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.34 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.626779e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.739e-09 1.213e-09
25- 50 1.946e-08 4.715e-09
50-150 6.675e-08 2.030e-08
15-150 8.995e-08 2.109e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-36.823 -200)
Norm : 4.47105 (-0.685952 0.685952)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.37 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 57 degrees of freedom
# Null hypothesis probability = 1.260892e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.114e-08 6.375e-09
25- 50 2.142e-08 1.231e-08
50-150 4.699e-08 2.652e-08
15-150 7.955e-08 4.473e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.96491 (-4.00673 6.18452)
R1^2/D10^2 : 0.306684 (-0.219449 1.04042)
kT2 [keV] : 46.2793 (-23.5687 -46.2793)
R2^2/D10^2 : 3.54506E-03 (-0.00329237 0.0193991)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.94 using 59 PHA bins.
# Reduced chi-squared = 0.9807 for 55 degrees of freedom
# Null hypothesis probability = 5.151201e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.074e-09 4.117e-09
25- 50 2.157e-08 1.163e-08
50-150 7.842e-08 4.130e-08
15-150 1.071e-07 5.450e-08
Plot creation:
Sun Apr 12 10:05:09 EDT 2020