batgrbproduct analysis for trigger=926515
batgrbproduct Analysis for Trigger=926515
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): Sat Sep 28 11:05:25 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger926515/batgroup_hand_proc
======================================================================
Trigger: 00926515 Segment: 000
BAT Trigger Time: 591184360 [s; MET]
Trigger Stop: 591184424 [s; MET]
UTC: 2019-09-26T09:52:16.353280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 100.598926332506 Dec: 59.5111569925745 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.13
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.13
Flight Position: [ source = BAT ]
RA: 100.598926332506 Dec: 59.5111569925745 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 100.616130821008 Dec: 59.5308933649202 [deg; J2000]
{ 06h 42m 27.9s , +59d 31' 51.2" }
+/- 2.26279996564204 [arcmin] (estimated 90% radius based on SNR)
+/- 1.23778103941021 [arcmin] (formal 1-sigma fit error)
SNR: 9.47285748524771
Angular difference between Flight and Ground position is 1.294772 arcmin
Partial Coding Fraction: 0.5 [ including projection effects ]
Duration
T90: 368.931999921799 +/- 20.9358796011286
Measured from: 11.3200000524521
to: 380.251999974251 [s; relative to TRIGTIME]
T50: 192.391999959946 +/- 118.065813095575
Measured from: 47.6799999475479
to: 240.071999907494 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 52.9479999542236
to: 53.9479999542236 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00399994850158691
to: 395.463999986649 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.889602 1.773760 0.970890 0.034758
0.125815 0.129669 0.112540 0.099295 [error]
Peak 0.031541 0.025983 0.008060 0.010941
0.008330 0.008503 0.007045 0.006592 [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 6.22e-07 7.74e-07 7.02e-07 1.11e-06 2.48e-06 3.20e-06 erg/cm2
Error 7.48e-08 6.40e-08 1.12e-07 3.53e-07 2.47e-07 4.73e-07 erg/cm2
Peak flux Power-law 2.53e-01 1.88e-01 9.27e-02 6.52e-02 5.64e-01 5.99e-01 ph/cm2/s
Error 1.23e-01 6.74e-02 5.63e-02 8.89e-02 2.00e-01 2.16e-01 ph/cm2/s
Fluence Cutoff-PL 6.22e-07 7.75e-07 7.01e-07 1.09e-06 2.48e-06 3.19e-06 erg/cm2
Error 7.36e-08 6.41e-08 1.11e-07 3.65e-07 2.43e-07 6.98e-07 erg/cm2
Peak flux Cutoff-PL 2.56e-01 1.88e-01 9.09e-02 6.22e-02 5.64e-01 5.98e-01 ph/cm2/s
Error 1.23e-01 1.12e-01 7.36e-02 9.72e-02 2.00e-01 2.40e-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 2.142 0.176 - - 6.71e-04 7.56e-05 57.420 57
CPL 2.288 0.138 123.5 0.0 5.54e-04 0.00e+00 56.700 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.018 0.717 - - 3.73e-03 1.75e-03 66.500 57
CPL -0.953 4.195 31.6 0.0 3.77e-01 0.00e+00 66.340 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 395.468 -0.004 395.464
T90 368.932 11.320 380.252
T50 192.392 47.680 240.072
Peak 1.000 52.948 53.948
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
100.6161 +59.5309 0.0204 28.6 114.7 1.3668 9.5 TRIG_00926515
------------------------------------------
Foreground time interval of the image:
-0.004 73.301 (delta_t = 73.305 [sec])
Background time interval of the image:
-239.000 -0.004 (delta_t = 238.996 [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 -0.004 sec. to 395.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14202 ( -0.171991 0.180986 )
Norm@50keV : 6.71180E-04 ( -7.66132e-05 7.46448e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.42 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.594685e-01
Photon flux (15-150 keV) in 395.5 sec: 0.107838 ( -0.00881177 0.00882119 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47734e-06 ( -2.44336e-07 2.4919e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 395.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28759 ( -0.271478 0.00451376 )
Epeak [keV] : 123.539 ( )
Norm@50keV : 5.53813E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.70 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 56 degrees of freedom
# Null hypothesis probability = 4.486113e-01
Photon flux (15-150 keV) in 395.5 sec: 0.107793 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.47556e-06 ( -2.4273e-07 2.42445e-07 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 395.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.31868 ( 9.31868 9.31868 )
beta : -2.14202 ( -0.18081 0.171873 )
Epeak [keV] : 18.0960 ( -18.096 -18.096 )
Norm@50keV : 9.12227E-02 ( -0.0104128 0.0101453 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.42 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 55 degrees of freedom
# Null hypothesis probability = 3.855612e-01
Photon flux (15-150 keV) in 395.5 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] : 7.94124 (-0.847697 1.00256)
R^2/D10^2 : 0.114565 (-0.0434632 0.0674306)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.95 using 59 PHA bins.
# Reduced chi-squared = 1.8938 for 57 degrees of freedom
# Null hypothesis probability = 5.379660e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.139e-07 7.416e-08
25- 50 8.879e-07 1.054e-07
50-150 2.275e-07 6.694e-08
15-150 1.629e-06 1.760e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.6128 (-13.5989 20.3562)
Norm : 0.570780 (-0.0879643 0.104513)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.29 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 57 degrees of freedom
# Null hypothesis probability = 1.872184e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.598e-07 6.407e-08
25- 50 8.317e-07 7.574e-08
50-150 8.870e-07 2.094e-07
15-150 2.279e-06 2.462e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.51242 (-0.741741 0.801436)
R1^2/D10^2 : 0.425227 (-0.181695 0.359182)
kT2 [keV] : 26.4704 (-6.21707 10.8911)
R2^2/D10^2 : 8.73555E-04 (-0.000580423 0.00136114)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.23 using 59 PHA bins.
# Reduced chi-squared = 0.9314 for 55 degrees of freedom
# Null hypothesis probability = 6.194892e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.357e-07 1.303e-07
25- 50 7.284e-07 1.515e-07
50-150 1.255e-06 6.640e-07
15-150 2.619e-06 8.171e-07
Peak spectrum fit
Power-law model
Time interval is from 52.948 sec. to 53.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01841 ( -0.674346 0.760461 )
Norm@50keV : 3.72982E-03 ( -0.00179315 0.00170151 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.50 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.823781e-01
Photon flux (15-150 keV) in 1 sec: 0.564263 ( -0.199832 0.199832 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44315e-08 ( -1.45162e-08 1.5871e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 52.948 sec. to 53.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.952624 ( -5.47249 2.91668 )
Epeak [keV] : 31.5823 ( )
Norm@50keV : 0.377468 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.34 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 56 degrees of freedom
# Null hypothesis probability = 1.624207e-01
Photon flux (15-150 keV) in 1 sec: 0.564033 0.530449 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.76043e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from 52.948 sec. to 53.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96538 ( -4.96538 -4.96538 )
beta : -2.38424 ( -2.33635 0.861494 )
Epeak [keV] : 22.5828 ( -22.5828 9.52854 )
Norm@50keV : 1278.92 ( -439.697 8.11532e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.18 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 55 degrees of freedom
# Null hypothesis probability = 1.636926e-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] : 8.21838 (-2.56469 3.34822)
R^2/D10^2 : 0.588829 (-0.588818 1.98368)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.46 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.832083e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.332e-09 4.698e-09
25- 50 1.344e-08 8.945e-09
50-150 3.853e-09 3.034e-09
15-150 2.462e-08 1.551e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 48.3429 (-29.0685 -48.3411)
Norm : 3.27274 (-1.615 3.54655)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.59 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 57 degrees of freedom
# Null hypothesis probability = 1.802964e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.939e-09 5.165e-09
25- 50 1.126e-08 7.085e-09
50-150 1.059e-08 8.485e-09
15-150 2.979e-08 1.891e-08
Double BB
R1^2/D10^2 : 8.25036E-05 (-6.40925e-05 6.41501e-05)
kT2 [keV] : 7.14144 (-2.38595 2.92246)
R2^2/D10^2 : 0.936234 (-0.655737 3.98569)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.25 using 59 PHA bins.
#Fit statistic : Chi-Squared = 62.49 using 59 PHA bins.
#Fit statistic : Chi-Squared = 62.43 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 55 degrees of freedom
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Reduced chi-squared = 1.135 for 55 degrees of freedom
# Null hypothesis probability = 1.424390e-01
# Null hypothesis probability = 2.273973e-01
# Null hypothesis probability = 2.291312e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.906e-09 5.750e-09
25- 50 1.260e-08 9.395e-09
50-150 5.110e-09 4.228e-09
15-150 2.561e-08 2.089e-08
Plot creation:
Sat Sep 28 11:17:35 EDT 2019