batgrbproduct analysis for trigger=761622
batgrbproduct Analysis for Trigger=761622
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): Wed Jul 12 13:13:31 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger761622/GCN5_download_cron
======================================================================
Trigger: 00761622 Segment: 000
BAT Trigger Time: 521504444.736 [s; MET]
Trigger Stop: 521504445.76 [s; MET]
UTC: 2017-07-11T22:20:25.381520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 45.7863907537336 Dec: 47.8503120698934 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.47
Image Trigger?: NO
Rate S/N Ratio: 72.5396443332885 [ if not an image trigger ]
Image S/N Ratio: 21.47
Flight Position: [ source = BAT ]
RA: 45.7863907537336 Dec: 47.8503120698934 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 45.7821139737987 Dec: 47.8447876505571 [deg; J2000]
{ 03h 03m 07.7s , +47d 50' 41.2" }
+/- 0.995887326665616 [arcmin] (estimated 90% radius based on SNR)
+/- 0.347686407283515 [arcmin] (formal 1-sigma fit error)
SNR: 30.5967451372686
Angular difference between Flight and Ground position is 0.373531 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 31.3399999141693 +/- 7.63462009249035
Measured from: -22.4039998650551
to: 8.93600004911423 [s; relative to TRIGTIME]
T50: 3.2399999499321 +/- 0.481331499129699
Measured from: -0.00799989700317383
to: 3.23200005292892 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0239999890327454
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.660000026226
to: 15.3679999709129 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.814087 0.985153 0.583921 0.114371
0.038699 0.040637 0.035595 0.031672 [error]
Peak 0.170050 0.230332 0.162702 0.023298
0.008052 0.008839 0.007719 0.005467 [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 2.43e-07 3.84e-07 4.57e-07 1.06e-06 1.39e-06 2.14e-06 erg/cm2
Error 2.01e-08 1.94e-08 3.49e-08 1.71e-07 8.05e-08 2.00e-07 erg/cm2
Peak flux Power-law 1.67e+00 1.59e+00 1.05e+00 1.07e+00 4.75e+00 5.38e+00 ph/cm2/s
Error 1.32e-01 7.66e-02 6.28e-02 1.32e-01 2.22e-01 2.45e-01 ph/cm2/s
Fluence Cutoff-PL 2.33e-07 3.96e-07 4.58e-07 6.33e-07 1.35e-06 1.72e-06 erg/cm2
Error 2.35e-08 2.46e-08 3.66e-08 3.27e-07 9.75e-08 4.15e-07 erg/cm2
Peak flux Cutoff-PL 1.53e+00 1.65e+00 1.09e+00 6.32e-01 4.63e+00 4.90e+00 ph/cm2/s
Error 1.61e-01 8.97e-02 7.03e-02 2.20e-01 2.35e-01 3.28e-01 ph/cm2/s
Fluence Band 2.23e-07 4.04e-07 4.43e-07 9.02e-07 1.35e-06 1.98e-06 erg/cm2
Error 2.53e-08 2.69e-08 3.75e-08 -------- 8.69e-08 -------- erg/cm2
Peak flux Band 1.52e+00 1.66e+00 1.09e+00 6.30e-01 4.63e+00 4.90e+00 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 1.748 0.096 - - 3.20e-03 1.77e-04 58.830 57
CPL 1.445 0.378 83.9 -29.2 4.66e-03 2.29e-03 56.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.599 0.081 - - 3.70e-02 1.74e-03 47.070 57
CPL 1.107 0.337 90.7 47.1 6.53e-02 2.58e-02 40.110 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: 9.024000 sec.
T50 in the 50-300 keV band: 2.624000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 47.028 -31.660 15.368
T90 31.340 -22.404 8.936
T50 3.240 -0.008 3.232
Peak 1.000 0.024 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
45.7821 +47.8448 0.0063 11.8 -11.3 2.5160 30.6 TRIG_00761622
------------------------------------------
Foreground time interval of the image:
-31.660 14.165 (delta_t = 45.825 [sec])
Background time interval of the image:
-239.736 -31.660 (delta_t = 208.076 [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 -31.660 sec. to 15.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74810 ( -0.095047 0.09629 )
Norm@50keV : 3.20299E-03 ( -0.000177917 0.000176584 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.83 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.081453e-01
Photon flux (15-150 keV) in 47.03 sec: 0.432794 ( -0.0221493 0.0221755 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39013e-06 ( -8.01561e-08 8.08766e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.660 sec. to 15.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44507 ( -0.412715 0.343151 )
Epeak [keV] : 83.9357 ( -25.5274 -83.9375 )
Norm@50keV : 4.65541E-03 ( -0.00154725 0.00302944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.96 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.392575e-01
Photon flux (15-150 keV) in 47.03 sec: 0.425133 ( -0.02403 0.023973 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34545e-06 ( -9.73333e-08 9.76484e-08 ) ergs/cm2
Band function
Time interval is from -31.660 sec. to 15.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.140999 ( -1.37992 0.707454 )
beta : -1.88165 ( 1.87895 0.154929 )
Epeak [keV] : 35.8083 ( -19.4982 54.9306 )
Norm@50keV : 3.73062E-02 ( -0.0371071 214.128 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9948 for 55 degrees of freedom
# Null hypothesis probability = 4.855107e-01
Photon flux (15-150 keV) in 47.03 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35074e-06 ( -1.35041e-06 -8.67045e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0287 ( )
R^2/D10^2 : 0.100237 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 135.42 using 59 PHA bins.
# Reduced chi-squared = 2.3758 for 57 degrees of freedom
# Null hypothesis probability = 2.500637e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.443e-07 1.326e-08
25- 50 4.554e-07 2.641e-08
50-150 3.968e-07 4.908e-08
15-150 9.965e-07 6.302e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 115.022 (-23.1997 31.8447)
Norm : 1.83972 (-0.123365 0.145299)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.26 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 57 degrees of freedom
# Null hypothesis probability = 4.652920e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.257e-07 1.921e-08
25- 50 4.008e-07 2.582e-08
50-150 7.002e-07 2.086e-07
15-150 1.327e-06 2.116e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.88613 (-1.12185 1.21597)
R1^2/D10^2 : 0.546370 (-0.222676 0.451463)
kT2 [keV] : 24.4579 (-4.81314 9.06389)
R2^2/D10^2 : 5.43676E-03 (-0.00365297 0.00727302)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.80 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 55 degrees of freedom
# Null hypothesis probability = 3.723112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.193e-07 3.720e-08
25- 50 4.059e-07 5.851e-08
50-150 7.105e-07 2.197e-07
15-150 1.336e-06 3.426e-07
Peak spectrum fit
Power-law model
Time interval is from 0.024 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59942 ( -0.080674 0.0814056 )
Norm@50keV : 3.69655E-02 ( -0.00174406 0.00173843 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.07 using 59 PHA bins.
# Reduced chi-squared = 0.8259 for 57 degrees of freedom
# Null hypothesis probability = 8.228636e-01
Photon flux (15-150 keV) in 1 sec: 4.74938 ( -0.221895 0.22217 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.4573e-07 ( -1.75043e-08 1.75847e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.024 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10725 ( -0.349289 0.324377 )
Epeak [keV] : 90.7056 ( -19.2181 74.8997 )
Norm@50keV : 6.53457E-02 ( -0.020013 0.0316689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.11 using 59 PHA bins.
# Reduced chi-squared = 0.7162 for 56 degrees of freedom
# Null hypothesis probability = 9.461171e-01
Photon flux (15-150 keV) in 1 sec: 4.62843 ( -0.23465 0.23479 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33384e-07 ( -1.9384e-08 1.9401e-08 ) ergs/cm2
Band function
Time interval is from 0.024 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10361 ( -0.326041 0.28796 )
beta : -9.37119 ( 9.3716 19.3716 )
Epeak [keV] : 91.0920 ( -14.9389 68.1253 )
Norm@50keV : 6.53983E-02 ( -0.0197449 0.0134245 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.11 using 59 PHA bins.
# Reduced chi-squared = 0.7293 for 55 degrees of freedom
# Null hypothesis probability = 9.341184e-01
Photon flux (15-150 keV) in 1 sec: 4.62715 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.34653e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.4750 ( )
R^2/D10^2 : 0.594514 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 132.14 using 59 PHA bins.
# Reduced chi-squared = 2.3183 for 57 degrees of freedom
# Null hypothesis probability = 6.661842e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.622e-08 2.170e-09
25- 50 1.007e-07 5.825e-09
50-150 1.413e-07 1.340e-08
15-150 2.682e-07 1.430e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 175.175 (-36.8488 -174.65)
Norm : 19.3844 (-0.964339 1.04013)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.76 using 59 PHA bins.
# Reduced chi-squared = 0.7151 for 57 degrees of freedom
# Null hypothesis probability = 9.486050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.903e-08 3.550e-09
25- 50 9.284e-08 1.059e-08
50-150 1.947e-07 6.007e-08
15-150 3.365e-07 7.145e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.26029 (-0.972365 1.11989)
R1^2/D10^2 : 6.90593 (-2.96618 5.94607)
kT2 [keV] : 22.1604 (-2.52397 3.54175)
R2^2/D10^2 : 0.104741 (-0.0457483 0.063465)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.53 using 59 PHA bins.
# Reduced chi-squared = 0.7005 for 55 degrees of freedom
# Null hypothesis probability = 9.551396e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.762e-08 9.045e-09
25- 50 9.203e-08 1.117e-08
50-150 1.894e-07 2.875e-08
15-150 3.291e-07 4.470e-08
Plot creation:
Wed Jul 12 13:18:30 EDT 2017