batgrbproduct analysis for trigger=844015
batgrbproduct Analysis for Trigger=844015
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 v2.46
Process Start Time (local time): Sun Jun 24 10:20:21 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger844015/batgroup_hand_proc
======================================================================
Trigger: 00844015 Segment: 000
BAT Trigger Time: 551464937.536 [s; MET]
Trigger Stop: 551464938.56 [s; MET]
UTC: 2018-06-23T16:41:56.383500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 214.511433345221 Dec: -60.2943173268399 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.68
Image Trigger?: NO
Rate S/N Ratio: 21.6794833886788 [ if not an image trigger ]
Image S/N Ratio: 7.68
Flight Position: [ source = BAT ]
RA: 214.511433345221 Dec: -60.2943173268399 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 214.528304880577 Dec: -60.2682278847358 [deg; J2000]
{ 14h 18m 06.8s , -60d 16' 05.6" }
+/- 0.869028475349914 [arcmin] (estimated 90% radius based on SNR)
+/- 0.252421402495833 [arcmin] (formal 1-sigma fit error)
SNR: 37.1717198594497
Angular difference between Flight and Ground position is 1.643841 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 114.879999995232 +/- 6.81986998340227
Measured from: -37.1720000505447
to: 77.7079999446869 [s; relative to TRIGTIME]
T50: 57.9679999351501 +/- 1.19814527588882
Measured from: 4.67599999904633
to: 62.6439999341965 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 59.1080000400543
to: 60.1080000400543 [s; relative to TRIGTIME]
Total Fluence
Measured from: -61.8200000524521
to: 114.067999958992 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.807966 6.713337 5.368042 1.519563
0.101476 0.102134 0.088507 0.071203 [error]
Peak 0.173210 0.243054 0.220925 0.070395
0.008414 0.009447 0.009098 0.006202 [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 1.48e-06 2.80e-06 4.10e-06 1.28e-05 1.16e-05 2.12e-05 erg/cm2
Error 6.61e-08 7.12e-08 9.68e-08 7.26e-07 2.41e-07 7.58e-07 erg/cm2
Peak flux Power-law 1.61e+00 1.80e+00 1.44e+00 1.90e+00 5.56e+00 6.76e+00 ph/cm2/s
Error 1.32e-01 8.81e-02 7.35e-02 2.08e-01 2.44e-01 2.96e-01 ph/cm2/s
Fluence Cutoff-PL 1.46e-06 2.81e-06 4.12e-06 1.19e-05 1.16e-05 2.03e-05 erg/cm2
Error 8.41e-08 7.38e-08 1.10e-07 1.59e-06 2.64e-07 1.82e-06 erg/cm2
Peak flux Cutoff-PL 1.57e+00 1.82e+00 1.46e+00 1.69e+00 5.53e+00 6.54e+00 ph/cm2/s
Error 1.24e-01 9.45e-02 6.44e-02 4.22e-01 2.51e-01 4.16e-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 1.452 0.040 - - 6.90e-03 1.40e-04 64.670 57
CPL 1.415 0.105 890.6 0.0 7.16e-03 9.02e-04 64.510 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.325 0.077 - - 4.64e-02 1.97e-03 51.310 57
CPL 1.218 0.222 399.5 0.0 5.21e-02 1.45e-02 50.890 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: 87.168000 sec.
T50 in the 50-300 keV band: 49.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 175.888 -61.820 114.068
T90 114.880 -37.172 77.708
T50 57.968 4.676 62.644
Peak 1.000 59.108 60.108
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
214.5283 -60.2682 0.0052 23.4516 -74.7558 4.6644762 37.172 TRIG_00844015
Foreground time interval of the image:
-35.635 16.165 (delta_t = 51.800 [sec])
Background time interval of the image:
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 -61.820 sec. to 114.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45201 ( -0.0399166 0.0398529 )
Norm@50keV : 6.89770E-03 ( -0.000140401 0.00014033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.67 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.265698e-01
Photon flux (15-150 keV) in 175.9 sec: 0.850471 ( -0.0201059 0.0201852 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16061e-05 ( -2.4105e-07 2.4127e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -61.820 sec. to 114.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41477 ( -0.157029 0.053309 )
Epeak [keV] : 890.648 ( -924.952 -924.952 )
Norm@50keV : 7.15932E-03 ( -0.000625442 0.0011789 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.51 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 56 degrees of freedom
# Null hypothesis probability = 2.035536e-01
Photon flux (15-150 keV) in 175.9 sec: 0.845798 ( -0.021263 0.024007 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15698e-05 ( -2.5203e-07 2.75934e-07 ) ergs/cm2
Band function
Time interval is from -61.820 sec. to 114.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.14019E-02 ( -1.49267 -1.49267 )
beta : -1.46865 ( -0.046545 0.0453937 )
Epeak [keV] : 37.2546 ( -37.2427 133.12 )
Norm@50keV : 6.90329E-02 ( -0.06917 399.309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.64 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 55 degrees of freedom
# Null hypothesis probability = 2.236444e-01
Photon flux (15-150 keV) in 175.9 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] : 18.3449 ( )
R^2/D10^2 : 4.62571E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 574.94 using 59 PHA bins.
# Reduced chi-squared = 10.087 for 57 degrees of freedom
# Null hypothesis probability = 1.123166e-86
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.449e-07 2.331e-08
25- 50 2.555e-06 8.179e-08
50-150 6.272e-06 1.935e-07
15-150 9.372e-06 2.295e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-3.76305 -200)
Norm : 3.54019 (-0.071759 0.071759)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.78 using 59 PHA bins.
# Reduced chi-squared = 1.9260 for 57 degrees of freedom
# Null hypothesis probability = 3.362795e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.551e-06 3.773e-08
25- 50 2.984e-06 6.420e-08
50-150 6.544e-06 1.583e-07
15-150 1.108e-05 2.603e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.71682 (-0.613449 0.655328)
R1^2/D10^2 : 0.604039 (-0.147604 0.207863)
kT2 [keV] : 30.6563 (-2.29659 2.88071)
R2^2/D10^2 : 6.61442E-03 (-0.00175405 0.00208678)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.23 using 59 PHA bins.
# Reduced chi-squared = 1.368 for 55 degrees of freedom
# Null hypothesis probability = 3.636744e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.281e-06 9.129e-08
25- 50 2.878e-06 1.231e-07
50-150 7.338e-06 3.483e-07
15-150 1.150e-05 4.292e-07
Peak spectrum fit
Power-law model
Time interval is from 59.108 sec. to 60.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32527 ( -0.0765853 0.0767324 )
Norm@50keV : 4.63775E-02 ( -0.00196648 0.0019657 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.31 using 59 PHA bins.
# Reduced chi-squared = 0.9002 for 57 degrees of freedom
# Null hypothesis probability = 6.873418e-01
Photon flux (15-150 keV) in 1 sec: 5.55954 ( -0.244027 0.244321 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.55534e-07 ( -2.14645e-08 2.15313e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.108 sec. to 60.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21782 ( -0.297036 0.146199 )
Epeak [keV] : 399.504 ( -399.451 -399.451 )
Norm@50keV : 5.20545E-02 ( -0.0101274 0.0188964 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.89 using 59 PHA bins.
# Reduced chi-squared = 0.9088 for 56 degrees of freedom
# Null hypothesis probability = 6.680040e-01
Photon flux (15-150 keV) in 1 sec: 5.52870 ( -0.25599 0.24669 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53021e-07 ( -2.2794e-08 2.1631e-08 ) ergs/cm2
Band function
Time interval is from 59.108 sec. to 60.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21862 ( 0.828469 0.828469 )
beta : -2.74197 ( 8.33126 18.2367 )
Epeak [keV] : 407.312 ( -175.048 -407.189 )
Norm@50keV : 5.19600E-02 ( -0.00460015 0.00696756 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.90 using 59 PHA bins.
# Reduced chi-squared = 0.9254 for 55 degrees of freedom
# Null hypothesis probability = 6.321226e-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] : 18.0630 ( )
R^2/D10^2 : 0.343712 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 176.40 using 59 PHA bins.
# Reduced chi-squared = 3.0947 for 57 degrees of freedom
# Null hypothesis probability = 3.947271e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.243e-08 1.865e-09
25- 50 1.040e-07 6.400e-09
50-150 2.465e-07 1.890e-08
15-150 3.729e-07 2.060e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-8.61673 -200)
Norm : 23.0451 (-0.983465 0.983465)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.85 using 59 PHA bins.
# Reduced chi-squared = 1.383 for 57 degrees of freedom
# Null hypothesis probability = 2.926581e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.740e-08 2.575e-09
25- 50 1.104e-07 5.250e-09
50-150 2.421e-07 1.165e-08
15-150 4.100e-07 1.775e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.81355 (-1.09158 1.32547)
R1^2/D10^2 : 5.51183 (-2.44132 4.83934)
kT2 [keV] : 28.4634 (-3.44065 5.19296)
R2^2/D10^2 : 6.38715E-02 (-0.0277295 0.0362699)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.93 using 59 PHA bins.
# Reduced chi-squared = 0.9806 for 55 degrees of freedom
# Null hypothesis probability = 5.153634e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.829e-08 8.440e-09
25- 50 1.023e-07 1.247e-08
50-150 3.017e-07 3.610e-08
15-150 4.523e-07 5.465e-08
Plot creation:
Sun Jun 24 10:30:29 EDT 2018