batgrbproduct analysis for trigger=948244
batgrbproduct Analysis for Trigger=948244
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): Thu Jan 9 13:03:23 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger948244/GCN5_download_cron
======================================================================
Trigger: 00948244 Segment: 000
BAT Trigger Time: 600134536 [s; MET]
Trigger Stop: 600134600 [s; MET]
UTC: 2020-01-08T00:01:51.776040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 243.794634024531 Dec: -15.0314399709074 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.74
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.74
Flight Position: [ source = BAT ]
RA: 243.794634024531 Dec: -15.0314399709074 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 243.796097152486 Dec: -15.0654450867605 [deg; J2000]
{ 16h 15m 11.1s , -15d 03' 55.6" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 1.69655823514931 [arcmin] (formal 1-sigma fit error)
SNR: -6.42158191697534
Angular difference between Flight and Ground position is 2.042067 arcmin
Partial Coding Fraction: 0.2480469 [ including projection effects ]
Duration
T90: 208 +/- 128.996123972777
Measured from: 273.000000119209
to: 481.000000119209 [s; relative to TRIGTIME]
T50: 160 +/- 181.019335983756
Measured from: 305.000000119209
to: 465.000000119209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 504.5
to: 505.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: 273
to: 513 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.330528 0.536504 -0.200042 -0.320039
0.229292 0.223499 0.197667 0.183990 [error]
Peak 0.015581 0.007973 0.019603 -0.009309
0.014842 0.014442 0.012069 0.011140 [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 1.66e-06 2.99e-07 2.59e-08 2.43e-09 1.98e-06 1.98e-06 erg/cm2
Error 2.13e-07 1.04e-07 2.12e-08 3.96e-09 2.64e-07 2.64e-07 erg/cm2
Peak flux Power-law 1.74e-01 1.06e-01 4.14e-02 2.16e-02 3.33e-01 3.44e-01 ph/cm2/s
Error 2.34e-01 1.15e-01 7.06e-02 3.97e-01 3.55e-01 3.67e-01 ph/cm2/s
Fluence Cutoff-PL 1.74e-06 1.49e-07 5.14e-11 6.78e-19 1.88e-06 1.89e-06 erg/cm2
Error 2.29e-07 1.40e-07 1.73e-08 0.00e+00 2.43e-07 2.42e-07 erg/cm2
Peak flux Cutoff-PL 2.12e-01 8.02e-02 1.73e-02 4.51e-03 3.14e-01 3.13e-01 ph/cm2/s
Error -------- 1.19e-01 1.12e-01 -------- 3.53e-01 4.48e-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 5.528 0.641 - - 1.04e-04 6.83e-05 71.520 57
CPL 1.000 0.000 50.0 0.0 2.16e-03 0.00e+00 201.640 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.329 0.000 - - 1.87e-03 2.40e-03 59.870 57
CPL -10.000 0.000 84.3 0.0 1.85e+00 0.00e+00 59.740 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 240.000 273.000 513.000
T90 208.000 273.000 481.000
T50 160.000 305.000 465.000
Peak 1.000 504.500 505.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
243.7961 -15.0654 0.0302 40.7 -54.3 -3.7528 -6.4 TRIG_00948244
------------------------------------------
Foreground time interval of the image:
273.000 513.000 (delta_t = 240.000 [sec])
Background time interval of the image:
-17.799 81.110 (delta_t = 98.909 [sec])
82.000 273.000 (delta_t = 191.000 [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 273.000 sec. to 513.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.52800 ( -0.609267 0.672087 )
Norm@50keV : 1.04146E-04 ( -5.23718e-05 8.41344e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.52 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 57 degrees of freedom
# Null hypothesis probability = 9.330127e-02
Photon flux (15-150 keV) in 240 sec: 0.268095 ( -0.0338829 0.0338833 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98386e-06 ( -2.62313e-07 2.6508e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 273.000 sec. to 513.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.15996E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 201.64 using 59 PHA bins.
# Reduced chi-squared = 3.6008 for 56 degrees of freedom
# Null hypothesis probability = 2.547274e-18
Photon flux (15-150 keV) in 240 sec: 0.264972 ( -0.034207 0.033971 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88494e-06 ( -2.42071e-07 2.43725e-07 ) ergs/cm2
Band function
Time interval is from 273.000 sec. to 513.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60317 ( 1.68861 1.68861 )
beta : -6.93973 ( 9.97813 19.9091 )
Epeak [keV] : 2.01205 ( -1.90239 6.14533 )
Norm@50keV : 0.212849 ( -0.212811 2.37653e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.46 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 55 degrees of freedom
# Null hypothesis probability = 9.077106e-02
Photon flux (15-150 keV) in 240 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] : 2.63233 (-0.291385 0.334565)
R^2/D10^2 : 91.3176 (-52.2077 128.268)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.23 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 57 degrees of freedom
# Null hypothesis probability = 1.284971e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.735e-06 5.791e-07
25- 50 1.564e-07 7.093e-08
50-150 8.083e-11 7.641e-11
15-150 1.891e-06 7.230e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.86057 (-0.82018 1.06394)
Norm : 68.3578 (-34.6445 76.4567)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.66 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.211443e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.713e-06 6.122e-07
25- 50 2.029e-07 7.963e-08
50-150 9.102e-10 8.271e-10
15-150 1.917e-06 6.335e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.54038 (-2.54006 0.383906)
R1^2/D10^2 : 113.719 (-71.4692 -114.728)
kT2 [keV] : 8.89471 (-9.01476 -9.01476)
R2^2/D10^2 : 1.24664E-02 (-0.0119996 197.621)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.62 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 55 degrees of freedom
# Null hypothesis probability = 1.025155e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.726e-06 9.336e-07
25- 50 2.273e-07 1.366e-07
50-150 3.521e-08 2.876e-08
15-150 1.989e-06 1.074e-06
Peak spectrum fit
Power-law model
Time interval is from 504.500 sec. to 505.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.32889 ( -2.34393 -2.34393 )
Norm@50keV : 1.87293E-03 ( -0.00184894 0.00295819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.87 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 57 degrees of freedom
# Null hypothesis probability = 3.720857e-01
Photon flux (15-150 keV) in 1 sec: 0.332906 ( -0.332925 0.37624 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78129e-08 ( -1.77974e-08 2.72114e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 504.500 sec. to 505.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -10.0000 ( 10 10 )
Epeak [keV] : 84.2872 ( -84.1668 -84.1668 )
Norm@50keV : 1.85209 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.74 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 56 degrees of freedom
# Null hypothesis probability = 3.412994e-01
Photon flux (15-150 keV) in 1 sec: 0.313809 ( -0.313809 0.391744 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8081e-08 ( -1.8081e-08 2.67605e-08 ) ergs/cm2
Band function
Time interval is from 504.500 sec. to 505.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11300 ( 1.98562 1.98562 )
beta : -2.32499 ( 9.37164 9.37164 )
Epeak [keV] : 3.40979 ( -20.12 -20.12 )
Norm@50keV : 0.111985 ( -0.113034 2.52793e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.87 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.035722e-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] : 3.52465 (-3.52352 -3.52352)
R^2/D10^2 : 14.7225 (-14.7455 -14.7455)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.654017e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.007e-09 4.711e-09
25- 50 1.736e-09 1.143e-09
50-150 9.335e-12 1.258e-11
15-150 8.753e-09 7.010e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.7381 (-98.9514 -98.9514)
Norm : 1.31364 (-1.33939 -1.33939)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.653558e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.653e-09 5.280e-09
25- 50 1.921e-09 1.982e-09
50-150 5.826e-11 1.052e-10
15-150 8.633e-09 6.835e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.12339 (-3.10954 130.019)
R1^2/D10^2 : 23.9789 (-26.4577 -26.4577)
kT2 [keV] : 24.8319 (-25.2129 -25.2129)
R2^2/D10^2 : 4.58025E-03 (-0.00440396 0.0504428)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.89 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.352920e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.226e-09 3.958e-09
25- 50 3.744e-09 2.646e-09
50-150 1.274e-08 1.105e-08
15-150 2.271e-08 1.363e-08
Plot creation:
Thu Jan 9 13:09:41 EST 2020