batgrbproduct analysis for trigger=908288
batgrbproduct Analysis for Trigger=908288
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 Jun 13 13:57:06 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger908288/batgroup_hand_proc
======================================================================
Trigger: 00908288 Segment: 000
BAT Trigger Time: 582091661.376 [s; MET]
Trigger Stop: 582091677.76 [s; MET]
UTC: 2019-06-13T04:07:18.310160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 182.558815925826 Dec: 67.2327743021234 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.12
Image Trigger?: NO
Rate S/N Ratio: 13.4164078649987 [ if not an image trigger ]
Image S/N Ratio: 7.12
Flight Position: [ source = BAT ]
RA: 182.558815925826 Dec: 67.2327743021234 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 182.552200551074 Dec: 67.2443496778828 [deg; J2000]
{ 12h 10m 12.5s , +67d 14' 39.7" }
+/- 2.21309317450172 [arcmin] (estimated 90% radius based on SNR)
+/- 1.12206915476289 [arcmin] (formal 1-sigma fit error)
SNR: 9.77826195173616
Angular difference between Flight and Ground position is 0.711298 arcmin
Partial Coding Fraction: 0.09667969 [ including projection effects ]
Duration
T90: 17.6319999694824 +/- 3.11392230173736
Measured from: 1.74399995803833
to: 19.3759999275208 [s; relative to TRIGTIME]
T50: 9.12000000476837 +/- 2.72512455032588
Measured from: 5.2960000038147
to: 14.4160000085831 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.88399994373322
to: 7.88399994373322 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.623999953269958
to: 20.3199999332428 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.544444 0.796054 0.882720 0.361634
0.141762 0.118954 0.107718 0.090518 [error]
Peak 0.104727 0.045834 0.074682 0.065429
0.030756 0.025742 0.025136 0.020389 [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-07 3.62e-07 6.23e-07 2.47e-06 1.71e-06 3.63e-06 erg/cm2
Error 5.08e-08 6.55e-08 9.81e-08 9.23e-07 2.52e-07 9.59e-07 erg/cm2
Peak flux Power-law 8.41e-01 4.67e-01 1.63e-01 7.43e-02 1.51e+00 1.55e+00 ph/cm2/s
Error 4.65e-01 1.92e-01 1.00e-01 8.80e-02 6.54e-01 6.56e-01 ph/cm2/s
Fluence Cutoff-PL 1.62e-07 3.64e-07 6.30e-07 2.18e-06 1.70e-06 3.30e-06 erg/cm2
Error 5.88e-08 6.87e-08 1.12e-07 1.74e-06 2.62e-07 1.40e-06 erg/cm2
Peak flux Cutoff-PL 7.65e-01 5.20e-01 1.82e-01 4.19e-02 1.50e+00 1.51e+00 ph/cm2/s
Error 6.54e-01 2.61e-01 1.45e-01 8.43e-02 6.56e-01 6.67e-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 1.218 0.263 - - 8.58e-03 1.24e-03 54.440 57
CPL 1.103 1.573 444.2 0.0 9.64e-03 1.36e-02 54.410 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.519 0.760 - - 7.60e-03 5.62e-03 76.620 57
CPL 1.751 0.000 15.9 0.0 1.97e-02 0.00e+00 76.430 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: 17.024000 sec.
T50 in the 50-300 keV band: 9.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.696 0.624 20.320
T90 17.632 1.744 19.376
T50 9.120 5.296 14.416
Peak 1.000 6.884 7.884
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
182.5522 67.2443 0.0195 39.2161 -91.1197 3.0031648 9.778 TRIG_00908288
Foreground time interval of the image:
0.624 20.320 (delta_t = 19.696 [sec])
Background time interval of the image:
-239.376 0.624 (delta_t = 240.000 [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 0.624 sec. to 20.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21832 ( -0.267894 0.258055 )
Norm@50keV : 8.57885E-03 ( -0.00124844 0.00123997 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.44 using 59 PHA bins.
# Reduced chi-squared = 0.9551 for 57 degrees of freedom
# Null hypothesis probability = 5.717613e-01
Photon flux (15-150 keV) in 19.7 sec: 1.00966 ( -0.157967 0.159932 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70587e-06 ( -2.51553e-07 2.52946e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.624 sec. to 20.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10334 ( -1.02362 2.12166 )
Epeak [keV] : 444.170 ( -349.447 -349.447 )
Norm@50keV : 9.64148E-03 ( -0.00893781 0.0182344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.41 using 59 PHA bins.
# Reduced chi-squared = 0.9716 for 56 degrees of freedom
# Null hypothesis probability = 5.352530e-01
Photon flux (15-150 keV) in 19.7 sec: 1.00400 ( -0.166182 0.16355 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69916e-06 ( -2.65907e-07 2.58626e-07 ) ergs/cm2
Band function
Time interval is from 0.624 sec. to 20.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96356 ( -4.96356 -4.96356 )
beta : -1.28717 ( -0.296175 0.288368 )
Epeak [keV] : 27.5423 ( -27.5423 13.3145 )
Norm@50keV : 372.382 ( -52.5655 2.79547e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9684 for 55 degrees of freedom
# Null hypothesis probability = 5.413643e-01
Photon flux (15-150 keV) in 19.7 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] : 20.5331 (-3.70814 4.93749)
R^2/D10^2 : 4.14714E-02 (-0.0210808 0.0396592)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.62 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 57 degrees of freedom
# Null hypothesis probability = 2.279208e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.570e-08 1.981e-08
25- 50 3.329e-07 9.072e-08
50-150 1.044e-06 2.633e-07
15-150 1.442e-06 3.103e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-46.5373 -200)
Norm : 4.34196 (-0.628356 0.628356)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.70 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 57 degrees of freedom
# Null hypothesis probability = 3.777750e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.132e-07 1.212e-07
25- 50 4.100e-07 2.297e-07
50-150 8.992e-07 4.958e-07
15-150 1.522e-06 8.493e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.94610 (-4.03232 5.92911)
R1^2/D10^2 : 0.414285 (-0.318338 3.00085)
kT2 [keV] : 38.2254 (-24.9575 -38.2226)
R2^2/D10^2 : 4.64286E-03 (-0.00414831 0.0131135)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9841 for 55 degrees of freedom
# Null hypothesis probability = 5.079338e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.446e-07 8.174e-08
25- 50 3.868e-07 2.119e-07
50-150 1.182e-06 6.508e-07
15-150 1.713e-06 8.667e-07
Peak spectrum fit
Power-law model
Time interval is from 6.884 sec. to 7.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51943 ( -0.630066 0.890348 )
Norm@50keV : 7.60223E-03 ( -0.00760226 0.00364237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.62 using 59 PHA bins.
# Reduced chi-squared = 1.344 for 57 degrees of freedom
# Null hypothesis probability = 4.257701e-02
Photon flux (15-150 keV) in 1 sec: 1.51139 ( -0.652046 0.655649 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64238e-08 ( -3.2237e-08 3.22691e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.884 sec. to 7.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75136 ( )
Epeak [keV] : 15.8797 ( )
Norm@50keV : 1.96974E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.43 using 59 PHA bins.
# Reduced chi-squared = 1.365 for 56 degrees of freedom
# Null hypothesis probability = 3.617192e-02
Photon flux (15-150 keV) in 1 sec: 1.49820 ( -0.653078 0.65855 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.748e-08 ( -3.25859e-08 3.2683e-08 ) ergs/cm2
Band function
Time interval is from 6.884 sec. to 7.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97429 ( -4.97429 -4.97429 )
beta : -2.68753 ( -1.59766 0.728917 )
Epeak [keV] : 21.5144 ( -21.5144 11.4475 )
Norm@50keV : 5114.13 ( -2082.63 5.62395e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.24 using 59 PHA bins.
# Reduced chi-squared = 1.386 for 55 degrees of freedom
# Null hypothesis probability = 3.055147e-02
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] : 12.2928 (-12.2949 3.97394)
R^2/D10^2 : 0.322154 (-0.3219 23.5688)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.40 using 59 PHA bins.
# Reduced chi-squared = 1.375 for 57 degrees of freedom
# Null hypothesis probability = 3.158352e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.031e-08 7.160e-09
25- 50 3.338e-08 2.255e-08
50-150 3.081e-08 2.167e-08
15-150 7.450e-08 4.944e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.3995 (-26.0462 58.4586)
Norm : 9.19776 (-5.01368 11.6059)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.49 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.348232e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.182e-08 1.224e-08
25- 50 2.996e-08 1.715e-08
50-150 2.589e-08 1.887e-08
15-150 7.767e-08 4.472e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.87129 (-3.57003 6.94681)
R1^2/D10^2 : 26.6051 (-26.6998 -26.8539)
kT2 [keV] : 14.6304 (-5.16092 51.5876)
R2^2/D10^2 : 0.115285 (-0.115303 0.285855)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.54 using 59 PHA bins.
# Reduced chi-squared = 1.373 for 55 degrees of freedom
# Null hypothesis probability = 3.448249e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.579e-08 1.695e-08
25- 50 2.690e-08 1.665e-08
50-150 2.906e-08 2.025e-08
15-150 8.175e-08 4.540e-08
Plot creation:
Thu Jun 13 14:03:22 EDT 2019