batgrbproduct analysis for trigger=958141
batgrbproduct Analysis for Trigger=958141
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): Tue Feb 25 10:09:41 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger958141/GCN5_download_cron
======================================================================
Trigger: 00958141 Segment: 000
BAT Trigger Time: 604207513.792 [s; MET]
Trigger Stop: 604207517.888 [s; MET]
UTC: 2020-02-24T03:24:49.304000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.794294261897 Dec: 41.6752702574759 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.8
Image Trigger?: NO
Rate S/N Ratio: 10.7238052947636 [ if not an image trigger ]
Image S/N Ratio: 6.8
Flight Position: [ source = BAT ]
RA: 248.794294261897 Dec: 41.6752702574759 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.767855470646 Dec: 41.6112446399565 [deg; J2000]
{ 16h 35m 04.3s , +41d 36' 40.5" }
+/- 2.65740788632042 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10353918638152 [arcmin] (formal 1-sigma fit error)
SNR: 7.52921146645206
Angular difference between Flight and Ground position is 4.020288 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 13 +/- 4.12310562561766
Measured from: -0.791999936103821
to: 12.2080000638962 [s; relative to TRIGTIME]
T50: 6 +/- 4.12310562561766
Measured from: 1.20800006389618
to: 7.20800006389618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.20799994468689
to: 3.20799994468689 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.79200005531311
to: 13.2079999446869 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.097285 0.089810 0.103164 0.032775
0.021682 0.021304 0.018681 0.016218 [error]
Peak 0.012763 0.014019 0.016721 0.004852
0.006226 0.006121 0.005303 0.004527 [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 2.42e-08 4.59e-08 6.74e-08 2.11e-07 1.91e-07 3.49e-07 erg/cm2
Error 8.54e-09 9.41e-09 1.85e-08 1.33e-07 4.40e-08 1.46e-07 erg/cm2
Peak flux Power-law 8.97e-02 1.15e-01 1.08e-01 1.78e-01 3.72e-01 4.90e-01 ph/cm2/s
Error 6.35e-02 4.99e-02 4.09e-02 1.57e-01 1.33e-01 1.81e-01 ph/cm2/s
Fluence Cutoff-PL 2.45e-08 4.60e-08 6.78e-08 1.95e-07 1.91e-07 3.31e-07 erg/cm2
Error 8.68e-09 9.24e-09 1.85e-08 1.86e-07 4.35e-08 1.90e-07 erg/cm2
Peak flux Cutoff-PL 8.81e-02 1.16e-01 1.09e-01 1.63e-01 3.71e-01 4.75e-01 ph/cm2/s
Error 6.84e-02 5.42e-02 4.73e-02 1.87e-01 1.37e-01 3.36e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 9.70e-02 1.49e-01 1.35e-01 8.59e-02 4.30e-01 4.65e-01 ph/cm2/s
Error -------- -------- 5.02e-02 1.02e-01 -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.447 0.387 - - 1.55e-03 3.13e-04 38.520 57
CPL 1.459 0.480 9999.4 0.0 1.54e-03 1.43e-03 38.540 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.095 0.660 - - 3.21e-03 1.11e-03 73.320 57
CPL 1.018 1.637 710.0 0.0 3.49e-03 1.25e-01 73.320 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 14.000 -0.792 13.208
T90 13.000 -0.792 12.208
T50 6.000 1.208 7.208
Peak 1.000 2.208 3.208
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.7679 +41.6112 0.0255 6.9 156.3 0.2973 7.5 TRIG_00958141
------------------------------------------
Foreground time interval of the image:
-0.792 10.068 (delta_t = 10.860 [sec])
11.208 13.208 (delta_t = 2.000 [sec])
Background time interval of the image:
-239.792 -0.792 (delta_t = 239.000 [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
Multiple GTIs in the spectrum
tstart tstop
-0.792000 10.068000
11.208000 13.208000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44676 ( -0.381745 0.392743 )
Norm@50keV : 1.54829E-03 ( -0.000317097 0.000309439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.52 using 59 PHA bins.
# Reduced chi-squared = 0.6758 for 57 degrees of freedom
# Null hypothesis probability = 9.712236e-01
Photon flux (15-150 keV) in 12.86 sec: 0.190652 ( -0.0374228 0.0375438 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90649e-07 ( -4.35059e-08 4.44633e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-0.792000 10.068000
11.208000 13.208000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45937 ( -0.575167 0.384237 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.54167E-03 ( -0.000316472 0.00253457 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.54 using 59 PHA bins.
# Reduced chi-squared = 0.6881 for 56 degrees of freedom
# Null hypothesis probability = 9.638339e-01
Photon flux (15-150 keV) in 12.86 sec: 0.191082 ( -0.037984 0.037106 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9094e-07 ( -4.36276e-08 4.33163e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-0.792000 10.068000
11.208000 13.208000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19143 ( 1.19145 1.19145 )
beta : -1.44668 ( 1.44671 0.381714 )
Epeak [keV] : 27.2047 ( -27.1872 -27.1872 )
Norm@50keV : 3.13330E-03 ( -0.00188427 0.249396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.52 using 59 PHA bins.
# Reduced chi-squared = 0.7004 for 55 degrees of freedom
# Null hypothesis probability = 9.551827e-01
Photon flux (15-150 keV) in 12.86 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] : 18.4589 (-4.63496 6.45229)
R^2/D10^2 : 1.04496E-02 (-0.00649742 0.017007)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.50 using 59 PHA bins.
# Reduced chi-squared = 0.8509 for 57 degrees of freedom
# Null hypothesis probability = 7.811431e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.092e-09 4.209e-09
25- 50 4.284e-08 1.894e-08
50-150 1.066e-07 4.406e-08
15-150 1.585e-07 5.569e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-77.915 -199.363)
Norm : 0.776132 (-0.151124 0.151124)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.61 using 59 PHA bins.
# Reduced chi-squared = 0.6948 for 57 degrees of freedom
# Null hypothesis probability = 9.614980e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.485e-08 1.466e-08
25- 50 4.781e-08 2.784e-08
50-150 1.049e-07 6.130e-08
15-150 1.775e-07 1.043e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.61673 (-1.56113 2.25771)
R1^2/D10^2 : 3.47652 (-3.11663 104.553)
kT2 [keV] : 24.5988 (-6.71983 13.0487)
R2^2/D10^2 : 3.72073E-03 (-0.00270777 0.00396606)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.23 using 59 PHA bins.
# Reduced chi-squared = 0.6405 for 55 degrees of freedom
# Null hypothesis probability = 9.825304e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.950e-08 1.766e-08
25- 50 3.509e-08 1.653e-08
50-150 1.284e-07 7.934e-08
15-150 1.930e-07 9.630e-08
Peak spectrum fit
Power-law model
Time interval is from 2.208 sec. to 3.208 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09481 ( -0.695775 0.623644 )
Norm@50keV : 3.21120E-03 ( -0.00112192 0.00110535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.32 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.156358e-02
Photon flux (15-150 keV) in 1 sec: 0.372312 ( -0.132429 0.133819 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36299e-08 ( -1.2362e-08 1.26186e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.208 sec. to 3.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01757 ( -4.29213 -1.01779 )
Epeak [keV] : 709.960 ( -712.529 -712.529 )
Norm@50keV : 3.48513E-03 ( -0.0013226 0.24848 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.32 using 59 PHA bins.
# Reduced chi-squared = 1.309 for 56 degrees of freedom
# Null hypothesis probability = 6.004007e-02
Photon flux (15-150 keV) in 1 sec: 0.371017 ( -0.138595 0.134883 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.34985e-08 ( -1.99266e-08 1.27038e-08 ) ergs/cm2
Band function
Time interval is from 2.208 sec. to 3.208 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.897937 ( 0.897937 0.897937 )
beta : -1.09481 ( 1.09481 0.695854 )
Epeak [keV] : 47.4090 ( -47.409 -47.409 )
Norm@50keV : 5.54604E-03 ( -0.00343256 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.32 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 55 degrees of freedom
# Null hypothesis probability = 4.991880e-02
Photon flux (15-150 keV) in 1 sec: 0.430085 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54823e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.0281 (-7.28712 17.0237)
R^2/D10^2 : 1.73072E-02 (-0.0173146 0.0602644)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.72 using 59 PHA bins.
# Reduced chi-squared = 1.311 for 57 degrees of freedom
# Null hypothesis probability = 5.766045e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.338e-09 8.915e-10
25- 50 6.669e-09 4.206e-09
50-150 1.983e-08 1.304e-08
15-150 2.784e-08 1.822e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-116.559 -199.363)
Norm : 1.54988 (-0.547723 0.547723)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.86 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 57 degrees of freedom
# Null hypothesis probability = 5.640582e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.859e-09 2.424e-09
25- 50 7.424e-09 4.720e-09
50-150 1.628e-08 1.022e-08
15-150 2.757e-08 1.730e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.5900 (-8.5393 15.5315)
R1^2/D10^2 : 4.82217E-02 (-0.0443678 -0.0482364)
kT2 [keV] : 198.995 (-199.011 -199.011)
R2^2/D10^2 : 5.68666E-05 (-5.7116e-05 0.0491914)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.31 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 55 degrees of freedom
# Null hypothesis probability = 4.999553e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.958e-09 1.368e-09
25- 50 7.423e-09 5.195e-09
50-150 2.317e-08 9.420e-09
15-150 3.255e-08 1.510e-08
Plot creation:
Tue Feb 25 10:13:33 EST 2020