batgrbproduct analysis for trigger=967774
batgrbproduct Analysis for Trigger=967774
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 25 18:30:09 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger967774/batgroup_hand_proc
======================================================================
Trigger: 00967774 Segment: 000
BAT Trigger Time: 609466606.592 [s; MET]
Trigger Stop: 609466610.688 [s; MET]
UTC: 2020-04-25T00:16:21.762420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 85.2407720384269 Dec: -13.4588771838186 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.62
Image Trigger?: NO
Rate S/N Ratio: 13.490737563232 [ if not an image trigger ]
Image S/N Ratio: 8.62
Flight Position: [ source = BAT ]
RA: 85.2407720384269 Dec: -13.4588771838186 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 85.2173769200413 Dec: -13.3994730425819 [deg; J2000]
{ 05h 40m 52.2s , -13d 23' 58.1" }
+/- 1.95064636822535 [arcmin] (estimated 90% radius based on SNR)
+/- 0.987794856144153 [arcmin] (formal 1-sigma fit error)
SNR: 11.7105583823982
Angular difference between Flight and Ground position is 3.816803 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 81 +/- 21.6621790224345
Measured from: -41.5920000076294
to: 39.4079999923706 [s; relative to TRIGTIME]
T50: 28 +/- 10.1980390271856
Measured from: -23.5920000076294
to: 4.40799999237061 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.40799999237061
to: 3.40799999237061 [s; relative to TRIGTIME]
Total Fluence
Measured from: -47.5920000076294
to: 58.4079999923706 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.526994 0.624328 0.581243 0.131340
0.069188 0.072306 0.063782 0.058385 [error]
Peak 0.020831 0.035056 0.025643 0.005298
0.007064 0.007723 0.006551 0.005949 [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 1.31e-07 2.72e-07 4.41e-07 1.61e-06 1.22e-06 2.45e-06 erg/cm2
Error 2.77e-08 3.30e-08 6.34e-08 5.35e-07 1.56e-07 5.75e-07 erg/cm2
Peak flux Power-law 1.91e-01 2.24e-01 1.89e-01 2.71e-01 7.01e-01 8.75e-01 ph/cm2/s
Error 7.87e-02 5.84e-02 5.18e-02 1.54e-01 1.65e-01 2.16e-01 ph/cm2/s
Fluence Cutoff-PL 1.32e-07 2.73e-07 4.40e-07 1.58e-06 1.22e-06 2.42e-06 erg/cm2
Error 2.76e-08 3.20e-08 4.77e-08 6.19e-07 1.50e-07 6.45e-07 erg/cm2
Peak flux Cutoff-PL 1.48e-01 2.50e-01 2.07e-01 7.89e-02 6.62e-01 6.84e-01 ph/cm2/s
Error 9.73e-02 7.39e-02 6.24e-02 2.32e-01 1.77e-01 2.57e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.44e-01 2.53e-01 2.04e-01 1.22e-01 6.64e-01 7.31e-01 ph/cm2/s
Error -------- 7.73e-02 -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.302 0.212 - - 1.17e-03 1.29e-04 77.590 57
CPL 1.299 0.214 10000.0 0.0 1.17e-03 0.00e+00 77.620 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.243 0.390 - - 5.93e-03 1.38e-03 46.050 57
CPL -0.105 1.767 78.6 -26.3 2.77e-02 4.13e-01 44.500 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: 43.328000 sec.
T50 in the 50-300 keV band: 29.952000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 106.000 -47.592 58.408
T90 81.000 -41.592 39.408
T50 28.000 -23.592 4.408
Peak 1.000 2.408 3.408
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
85.2174 -13.3995 0.0165 12.7 -4.7 1.6747 11.7 TRIG_00967774
------------------------------------------
Foreground time interval of the image:
-47.592 41.509 (delta_t = 89.101 [sec])
Background time interval of the image:
-239.592 -47.592 (delta_t = 192.000 [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 -47.592 sec. to 58.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30150 ( -0.212911 0.21025 )
Norm@50keV : 1.16591E-03 ( -0.000128827 0.00012848 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.59 using 59 PHA bins.
# Reduced chi-squared = 1.361 for 57 degrees of freedom
# Null hypothesis probability = 3.624079e-02
Photon flux (15-150 keV) in 106 sec: 0.139134 ( -0.0155619 0.0155963 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22081e-06 ( -1.5474e-07 1.56586e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -47.592 sec. to 58.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29863 ( -0.229921 0.197596 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.17063E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.62 using 59 PHA bins.
# Reduced chi-squared = 1.386 for 56 degrees of freedom
# Null hypothesis probability = 2.950154e-02
Photon flux (15-150 keV) in 106 sec: 0.139508 ( -0.015738 0.015274 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21823e-06 ( -1.51569e-07 1.4857e-07 ) ergs/cm2
Band function
Time interval is from -47.592 sec. to 58.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07036 ( 1.07026 1.07026 )
beta : -1.30147 ( 1.30148 0.212877 )
Epeak [keV] : 36.5282 ( -36.5942 -36.5942 )
Norm@50keV : 2.17896E-03 ( -0.0011394 412.334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.59 using 59 PHA bins.
# Reduced chi-squared = 1.411 for 55 degrees of freedom
# Null hypothesis probability = 2.409495e-02
Photon flux (15-150 keV) in 106 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] : 16.6625 (-2.98468 4.0402)
R^2/D10^2 : 1.07775E-02 (-0.00544221 0.0102814)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.75 using 59 PHA bins.
# Reduced chi-squared = 1.9781 for 57 degrees of freedom
# Null hypothesis probability = 1.551072e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.494e-08 1.612e-08
25- 50 2.827e-07 4.685e-08
50-150 5.568e-07 1.350e-07
15-150 9.044e-07 1.561e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-41.8757 -200)
Norm : 0.570163 (-0.0632465 0.0632465)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.89 using 59 PHA bins.
# Reduced chi-squared = 1.472 for 57 degrees of freedom
# Null hypothesis probability = 1.175404e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.505e-07 8.390e-08
25- 50 2.896e-07 1.592e-07
50-150 6.351e-07 3.481e-07
15-150 1.075e-06 5.862e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.29112 (-1.97904 2.27693)
R1^2/D10^2 : 9.35157E-02 (-0.049126 0.136886)
kT2 [keV] : 76.7402 (-41.5232 -77.447)
R2^2/D10^2 : 1.32055E-04 (-0.00010198 0.000677043)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.58 using 59 PHA bins.
# Reduced chi-squared = 1.338 for 55 degrees of freedom
# Null hypothesis probability = 4.784897e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.327e-07 4.578e-08
25- 50 2.846e-07 1.115e-07
50-150 9.128e-07 4.776e-07
15-150 1.330e-06 5.949e-07
Peak spectrum fit
Power-law model
Time interval is from 2.408 sec. to 3.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24304 ( -0.396401 0.384041 )
Norm@50keV : 5.93265E-03 ( -0.0013803 0.0013785 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.05 using 59 PHA bins.
# Reduced chi-squared = 0.8078 for 57 degrees of freedom
# Null hypothesis probability = 8.500590e-01
Photon flux (15-150 keV) in 1 sec: 0.700883 ( -0.164938 0.165423 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.94786e-08 ( -1.5282e-08 1.56495e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.408 sec. to 3.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.104780 ( -2.01906 1.51493 )
Epeak [keV] : 78.6378 ( -25.9373 -78.6362 )
Norm@50keV : 2.77494E-02 ( -0.0277518 0.798008 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.50 using 59 PHA bins.
# Reduced chi-squared = 0.7946 for 56 degrees of freedom
# Null hypothesis probability = 8.660174e-01
Photon flux (15-150 keV) in 1 sec: 0.662466 ( -0.179103 0.175103 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.34883e-08 ( -1.62412e-08 1.7741e-08 ) ergs/cm2
Band function
Time interval is from 2.408 sec. to 3.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.199004 ( -0.273691 -0.273691 )
beta : -2.25067 ( 2.30215 2.50743 )
Epeak [keV] : 74.9278 ( -73.3725 83.6824 )
Norm@50keV : 3.16414E-02 ( -0.0352261 155.372 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.40 using 59 PHA bins.
# Reduced chi-squared = 0.8072 for 55 degrees of freedom
# Null hypothesis probability = 8.460920e-01
Photon flux (15-150 keV) in 1 sec: 0.663867 ( ) 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] : 16.7243 (-3.71098 5.48014)
R^2/D10^2 : 5.96620E-02 (-0.0370239 0.0817007)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.19 using 59 PHA bins.
# Reduced chi-squared = 0.7927 for 57 degrees of freedom
# Null hypothesis probability = 8.707942e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.414e-09 1.781e-09
25- 50 1.491e-08 6.410e-09
50-150 2.961e-08 1.575e-08
15-150 4.793e-08 2.083e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-91.5689 -199.363)
Norm : 2.89317 (-0.677999 0.678021)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.11 using 59 PHA bins.
# Reduced chi-squared = 0.8265 for 57 degrees of freedom
# Null hypothesis probability = 8.219129e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.204e-09 4.358e-09
25- 50 1.386e-08 8.170e-09
50-150 3.039e-08 1.798e-08
15-150 5.146e-08 3.075e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.93504 (-3.92676 -3.92676)
R1^2/D10^2 : 2.61124 (-2.61467 -2.61467)
kT2 [keV] : 18.3379 (-4.7671 -18.3366)
R2^2/D10^2 : 4.15739E-02 (-0.0415868 0.0801047)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.30 using 59 PHA bins.
# Reduced chi-squared = 0.8055 for 55 degrees of freedom
# Null hypothesis probability = 8.484760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.975e-09 2.932e-09
25- 50 1.380e-08 7.980e-09
50-150 3.200e-08 1.892e-08
15-150 5.077e-08 2.955e-08
Plot creation:
Sat Apr 25 18:39:12 EDT 2020