batgrbproduct analysis for trigger=974942
batgrbproduct Analysis for Trigger=974942
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 May 30 06:00:12 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger974942/GCN5_download_cron
======================================================================
Trigger: 00974942 Segment: 000
BAT Trigger Time: 612406620.8 [s; MET]
Trigger Stop: 612406632.96 [s; MET]
UTC: 2020-05-29T00:56:35.779500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 238.751484339386 Dec: -11.0573217127229 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.33
Image Trigger?: NO
Rate S/N Ratio: 19.2613602842582 [ if not an image trigger ]
Image S/N Ratio: 16.33
Flight Position: [ source = BAT ]
RA: 238.751484339386 Dec: -11.0573217127229 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 238.755591513501 Dec: -11.0762517255703 [deg; J2000]
{ 15h 55m 01.3s , -11d 04' 34.5" }
+/- 1.1978650046484 [arcmin] (estimated 90% radius based on SNR)
+/- 0.432358248801639 [arcmin] (formal 1-sigma fit error)
SNR: 23.5021247248624
Angular difference between Flight and Ground position is 1.161264 arcmin
Partial Coding Fraction: 0.5 [ including projection effects ]
Duration
T90: 79.567999958992 +/- 7.25663423168268
Measured from: 0.868000149726868
to: 80.4360001087189 [s; relative to TRIGTIME]
T50: 36.7639999389648 +/- 4.98128494583565
Measured from: 8.75200021266937
to: 45.5160001516342 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.58399999141693
to: 2.58399999141693 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.23599994182587
to: 92.9240000247955 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.900501 2.106347 1.325586 0.240404
0.100829 0.089438 0.074249 0.061947 [error]
Peak 0.064549 0.080926 0.053593 0.016191
0.011356 0.010272 0.008830 0.006952 [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 6.39e-07 9.25e-07 9.98e-07 2.00e-06 3.18e-06 4.57e-06 erg/cm2
Error 5.49e-08 4.75e-08 7.57e-08 3.23e-07 1.74e-07 3.85e-07 erg/cm2
Peak flux Power-law 7.11e-01 6.08e-01 3.55e-01 3.10e-01 1.81e+00 1.98e+00 ph/cm2/s
Error 1.68e-01 8.90e-02 7.30e-02 1.29e-01 2.65e-01 2.82e-01 ph/cm2/s
Fluence Cutoff-PL 6.08e-07 9.51e-07 1.01e-06 1.26e-06 3.10e-06 3.82e-06 erg/cm2
Error 6.63e-08 5.70e-08 7.93e-08 5.00e-07 2.02e-07 7.54e-07 erg/cm2
Peak flux Cutoff-PL 7.13e-01 6.09e-01 3.54e-01 3.06e-01 1.81e+00 1.98e+00 ph/cm2/s
Error 1.34e-01 9.40e-02 7.58e-02 2.26e-01 2.67e-01 2.82e-01 ph/cm2/s
Fluence Band 6.02e-07 9.47e-07 1.00e-06 1.28e-06 3.09e-06 3.84e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 7.11e-01 6.09e-01 3.55e-01 3.07e-01 1.81e+00 1.98e+00 ph/cm2/s
Error -------- 9.49e-02 7.58e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.892 0.098 - - 3.67e-03 2.02e-04 74.440 57
CPL 1.586 0.381 64.6 -23.9 5.29e-03 2.46e-03 72.480 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.777 0.268 - - 1.32e-02 2.08e-03 46.410 57
CPL 1.783 0.274 9999.4 -0.0 1.32e-02 1.39e-02 46.410 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: 79.104000 sec.
T50 in the 50-300 keV band: 31.616000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 94.160 -1.236 92.924
T90 79.568 0.868 80.436
T50 36.764 8.752 45.516
Peak 1.000 1.584 2.584
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
238.7556 -11.0763 0.0082 29.0 61.5 4.2425 23.5 TRIG_00974942
------------------------------------------
Foreground time interval of the image:
-1.236 53.401 (delta_t = 54.637 [sec])
Background time interval of the image:
-60.800 -1.236 (delta_t = 59.564 [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 -1.236 sec. to 92.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89162 ( -0.0971185 0.0986256 )
Norm@50keV : 3.67486E-03 ( -0.000203092 0.000201583 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.44 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 57 degrees of freedom
# Null hypothesis probability = 6.029844e-02
Photon flux (15-150 keV) in 94.16 sec: 0.525515 ( -0.0280577 0.0281515 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.18106e-06 ( -1.74014e-07 1.74931e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.236 sec. to 92.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58618 ( -0.405399 0.355738 )
Epeak [keV] : 64.6067 ( -16.8389 -64.6067 )
Norm@50keV : 5.28728E-03 ( -0.001717 0.00319424 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.48 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 56 degrees of freedom
# Null hypothesis probability = 6.839991e-02
Photon flux (15-150 keV) in 94.16 sec: 0.514761 ( -0.030752 0.030828 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.09674e-06 ( -2.01841e-07 2.02284e-07 ) ergs/cm2
Band function
Time interval is from -1.236 sec. to 92.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58619 ( -0.358184 0.359371 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 64.5987 ( -16.7735 -64.5987 )
Norm@50keV : 5.28611E-03 ( -0.001717 0.00319534 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.48 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 55 degrees of freedom
# Null hypothesis probability = 5.717005e-02
Photon flux (15-150 keV) in 94.16 sec: 0.518431 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.09448e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2458 ( )
R^2/D10^2 : 0.109333 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 161.72 using 59 PHA bins.
# Reduced chi-squared = 2.8372 for 57 degrees of freedom
# Null hypothesis probability = 5.799733e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.270e-07 3.121e-08
25- 50 1.054e-06 6.356e-08
50-150 9.628e-07 1.112e-07
15-150 2.343e-06 1.332e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 90.7680 (-15.2479 20.7108)
Norm : 2.32873 (-0.184883 0.20685)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.92 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 57 degrees of freedom
# Null hypothesis probability = 6.534326e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.723e-07 5.009e-08
25- 50 9.698e-07 5.009e-08
50-150 1.484e-06 4.524e-07
15-150 3.026e-06 4.426e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.66050 (-0.927419 1.04406)
R1^2/D10^2 : 1.36096 (-0.638948 1.45287)
kT2 [keV] : 20.0400 (-2.63943 3.7523)
R2^2/D10^2 : 1.35155E-02 (-0.0067017 0.0104796)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.53 using 59 PHA bins.
# Reduced chi-squared = 1.337 for 55 degrees of freedom
# Null hypothesis probability = 4.827404e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.978e-07 1.207e-07
25- 50 9.285e-07 1.413e-07
50-150 1.494e-06 3.234e-07
15-150 3.020e-06 4.468e-07
Peak spectrum fit
Power-law model
Time interval is from 1.584 sec. to 2.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77656 ( -0.260355 0.274828 )
Norm@50keV : 1.32487E-02 ( -0.00210362 0.00205008 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.41 using 59 PHA bins.
# Reduced chi-squared = 0.8142 for 57 degrees of freedom
# Null hypothesis probability = 8.407134e-01
Photon flux (15-150 keV) in 1 sec: 1.80932 ( -0.264251 0.265126 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22084e-07 ( -1.96064e-08 1.98581e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.584 sec. to 2.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78296 ( -0.277239 0.271558 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 1.32213E-02 ( -0.00210348 0.025715 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.41 using 59 PHA bins.
# Reduced chi-squared = 0.8288 for 56 degrees of freedom
# Null hypothesis probability = 8.157936e-01
Photon flux (15-150 keV) in 1 sec: 1.80941 ( -0.27023 0.26404 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21776e-07 ( -2.0141e-08 2.0161e-08 ) ergs/cm2
Band function
Time interval is from 1.584 sec. to 2.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.47553 ( 7.43588 2.47553 )
beta : -1.77656 ( -0.274827 0.26036 )
Epeak [keV] : 84.6915 ( -84.6915 -84.6915 )
Norm@50keV : 1.80069 ( -0.28592 0.278635 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.41 using 59 PHA bins.
# Reduced chi-squared = 0.8438 for 55 degrees of freedom
# Null hypothesis probability = 7.885850e-01
Photon flux (15-150 keV) in 1 sec: 1.80890 ( ) 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] : 13.6429 (-2.84181 3.36406)
R^2/D10^2 : 0.262897 (-0.141615 0.347244)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.92 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 57 degrees of freedom
# Null hypothesis probability = 2.201970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.036e-08 3.195e-09
25- 50 3.753e-08 9.055e-09
50-150 4.538e-08 1.327e-08
15-150 9.327e-08 2.001e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 128.727 (-56.7642 -127.026)
Norm : 7.46251 (-1.26679 1.81126)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8305 for 57 degrees of freedom
# Null hypothesis probability = 8.154875e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.937e-08 7.186e-09
25- 50 3.507e-08 1.459e-08
50-150 6.473e-08 3.895e-08
15-150 1.192e-07 5.769e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.19008 (-1.7465 2.16167)
R1^2/D10^2 : 6.91056 (-5.1555 37.6154)
kT2 [keV] : 22.4902 (-5.62156 11.0469)
R2^2/D10^2 : 3.56782E-02 (-0.0271655 0.0697391)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8287 for 55 degrees of freedom
# Null hypothesis probability = 8.135644e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.277e-08 1.275e-08
25- 50 3.163e-08 1.484e-08
50-150 6.761e-08 3.951e-08
15-150 1.220e-07 5.973e-08
Plot creation:
Sat May 30 06:03:42 EDT 2020