batgrbproduct analysis for trigger=1047531
batgrbproduct Analysis for Trigger=1047531
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 v2.48
Process Start Time (local time): Sun May 9 21:54:13 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1047531/GCN5_download_cron
======================================================================
Trigger: 01047531 Segment: 000
BAT Trigger Time: 642263567.424 [s; MET]
Trigger Stop: 642263568.448 [s; MET]
UTC: 2021-05-09T14:32:20.436060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 350.352300001742 Dec: 6.67546089388726 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 8.09
Flight Position: [ source = BAT ]
RA: 350.352300001742 Dec: 6.67546089388726 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 350.363267028889 Dec: 6.6503171829979 [deg; J2000]
{ 23h 21m 27.2s , +06d 39' 01.1" }
+/- 1.49419909739169 [arcmin] (estimated 90% radius based on SNR)
+/- 0.653210753880704 [arcmin] (formal 1-sigma fit error)
SNR: 17.1381296219005
Angular difference between Flight and Ground position is 1.644112 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 8.21599996089935 +/- 0.754360728118585
Measured from: -1.09599995613098
to: 7.12000000476837 [s; relative to TRIGTIME]
T50: 4.12399995326996 +/- 1.33024509166779
Measured from: 0.644000053405762
to: 4.76800000667572 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.24399995803833
to: 4.24399995803833 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.64800000190735
to: 7.62800002098083 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.296977 0.290211 0.105470 0.017193
0.021583 0.022096 0.018744 0.015945 [error]
Peak 0.047368 0.058197 0.041451 -0.001703
0.007419 0.007697 0.006678 0.005015 [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 9.15e-08 1.12e-07 9.87e-08 1.50e-07 3.54e-07 4.52e-07 erg/cm2
Error 1.09e-08 1.04e-08 1.68e-08 4.88e-08 3.88e-08 6.97e-08 erg/cm2
Peak flux Power-law 4.69e-01 3.98e-01 2.30e-01 1.99e-01 1.18e+00 1.30e+00 ph/cm2/s
Error 9.85e-02 5.99e-02 5.06e-02 8.11e-02 1.78e-01 1.99e-01 ph/cm2/s
Fluence Cutoff-PL 8.43e-08 1.30e-07 8.20e-08 1.71e-08 3.10e-07 3.13e-07 erg/cm2
Error 1.23e-08 1.51e-08 2.29e-08 2.96e-08 4.10e-08 4.95e-08 erg/cm2
Peak flux Cutoff-PL 3.64e-01 4.97e-01 2.41e-01 3.01e-02 1.13e+00 1.13e+00 ph/cm2/s
Error 1.18e-01 8.31e-02 6.50e-02 4.22e-02 1.79e-01 1.81e-01 ph/cm2/s
Fluence Band 8.33e-08 1.29e-07 8.10e-08 3.89e-08 3.16e-07 3.34e-07 erg/cm2
Error 1.21e-08 -------- -------- 6.42e-08 -------- -------- 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 2.177 0.174 - - 4.08e-03 5.06e-04 78.230 57
CPL 0.755 0.999 33.0 8.3 3.02e-02 7.27e-02 70.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.789 0.243 - - 8.63e-03 1.49e-03 74.550 57
CPL -0.299 1.375 48.7 10.5 1.23e-01 4.14e-01 64.590 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 9.276 -1.648 7.628
T90 8.216 -1.096 7.120
T50 4.124 0.644 4.768
Peak 1.000 3.244 4.244
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
350.3633 +6.6503 0.0112 23.0 -167.3 0.7057 17.1 TRIG_01047531
------------------------------------------
Foreground time interval of the image:
-1.648 7.628 (delta_t = 9.276 [sec])
Background time interval of the image:
-60.424 -1.648 (delta_t = 58.776 [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 -1.648 sec. to 7.628 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17727 ( -0.169057 0.178443 )
Norm@50keV : 4.07520E-03 ( -0.000509703 0.000502169 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 78.23 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 3.25e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 9.276 sec: 0.666702 ( -0.0596772 0.0596817 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.54314e-07 ( -3.83981e-08 3.92889e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.648 sec. to 7.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.755100 ( -1.09902 0.899506 )
Epeak [keV] : 32.9850 ( -10.3448 6.23836 )
Norm@50keV : 3.01870E-02 ( -0.0301874 0.115192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 70.16 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.66e-02 with 56 degrees of freedom
Photon flux (15-150 keV) in 9.276 sec: 0.637073 ( -0.061176 0.06157 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10058e-07 ( -3.83702e-08 4.35471e-08 ) ergs/cm2
Band function
Time interval is from -1.648 sec. to 7.628 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.614004 ( -1.0345 0.702153 )
beta : -3.58959 ( 3.34958 0.975083 )
Epeak [keV] : 33.0368 ( -9.28047 5.89963 )
Norm@50keV : 3.71736E-02 ( -0.0201243 459.153 )
------------------------------------------------------------
Photon flux (15-150 keV) in 9.276 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.157e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.81111 (-0.82175 0.90158)
R^2/D10^2 : 0.508829 (-0.16332 0.241738)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 80.52 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.18e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.054e-08 1.075e-08
25- 50 1.450e-07 1.725e-08
50-150 5.181e-08 1.350e-08
15-150 2.673e-07 2.959e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.8405 (-9.78903 14.0962)
Norm : 3.94155 (-0.576814 0.727472)
------------------------------------------------------------
#Fit statistic : Chi-Squared 71.15 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 9.85e-02 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.799e-08 9.935e-09
25- 50 1.234e-07 1.262e-08
50-150 1.125e-07 3.140e-08
15-150 3.238e-07 4.207e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.89971 (-1.91845 2.40523)
R1^2/D10^2 : 2.72664 (-1.88057 17.3974)
kT2 [keV] : 12.4439 (-2.66892 9.56061)
R2^2/D10^2 : 9.31399E-02 (-0.0872352 0.21041)
------------------------------------------------------------
#Fit statistic : Chi-Squared 69.98 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 8.41e-02 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.504e-08 4.553e-08
25- 50 1.283e-07 6.549e-08
50-150 9.002e-08 5.153e-08
15-150 3.033e-07 1.535e-07
Peak spectrum fit
Power-law model
Time interval is from 3.244 sec. to 4.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78916 ( -0.23569 0.250217 )
Norm@50keV : 8.62500E-03 ( -0.0015066 0.00148035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 74.55 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 5.93e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.18356 ( -0.178255 0.178292 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.94288e-08 ( -1.39397e-08 1.42871e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.244 sec. to 4.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.299442 ( -1.54141 1.20834 )
Epeak [keV] : 48.6953 ( -8.13369 12.7994 )
Norm@50keV : 0.123162 ( -0.123145 0.705503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 64.59 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.02e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 1.12967 ( -0.177963 0.17909 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.06272e-08 ( -1.26916e-08 1.39184e-08 ) ergs/cm2
Band function
Time interval is from 3.244 sec. to 4.244 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.282796 ( -1.18391 1.48538 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 48.8463 ( -8.27513 12.6434 )
Norm@50keV : 0.120160 ( -0.12011 0.24583 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0595e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2011 (-1.69994 1.9248)
R^2/D10^2 : 0.294642 (-0.123582 0.214504)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.24 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.88e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.288e-09 2.485e-09
25- 50 2.980e-08 5.705e-09
50-150 2.697e-08 9.150e-09
15-150 6.606e-08 1.463e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 89.2873 (-31.7822 69.9813)
Norm : 5.52446 (-1.01954 1.24807)
------------------------------------------------------------
#Fit statistic : Chi-Squared 69.64 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.21e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.441e-08 2.960e-09
25- 50 2.433e-08 4.195e-09
50-150 3.687e-08 2.124e-08
15-150 7.561e-08 2.400e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.71651 (-4.50398 5.88385)
R1^2/D10^2 : 3.08184 (-2.99261 -3.064)
kT2 [keV] : 14.0846 (-2.56044 4.52806)
R2^2/D10^2 : 0.152348 (-0.126117 0.10937)
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.27 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.08e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.228e-08 6.540e-09
25- 50 2.720e-08 1.439e-08
50-150 3.138e-08 1.900e-08
15-150 7.086e-08 3.714e-08
Plot creation:
Sun May 9 21:58:22 EDT 2021