batgrbproduct analysis for trigger=864882
batgrbproduct Analysis for Trigger=864882
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 Oct 2 21:44:59 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger864882/GCN5_download_cron
======================================================================
Trigger: 00864882 Segment: 000
BAT Trigger Time: 560126376 [s; MET]
Trigger Stop: 560126440 [s; MET]
UTC: 2018-10-01T22:39:14.315220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.6451806043689 Dec: 22.0022693804837 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.06
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.06
Flight Position: [ source = BAT ]
RA: 83.6451806043689 Dec: 22.0022693804837 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.6433127489345 Dec: 22.0043651986371 [deg; J2000]
{ 05h 34m 34.4s , +22d 00' 15.7" }
+/- 0.947187018264927 [arcmin] (estimated 90% radius based on SNR)
+/- 0.356681883827862 [arcmin] (formal 1-sigma fit error)
SNR: 32.8686307574846
Angular difference between Flight and Ground position is 0.163125 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 582.663999915123 +/- 18.4809589359804
Measured from: 1.22000014781952
to: 583.884000062943 [s; relative to TRIGTIME]
T50: 336.763999938965 +/- 18.0536556107287
Measured from: 122.960000157356
to: 459.724000096321 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -46.8999999761581
to: -45.8999999761581 [s; relative to TRIGTIME]
Total Fluence
Measured from: -46.7039999961853
to: 618.003999948502 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 9.932452 9.691848 4.841297 1.086144
0.216851 0.223287 0.193448 0.173367 [error]
Peak 0.046392 -0.004037 0.012083 0.019559
0.017306 0.017334 0.016204 0.014706 [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 3.55e-06 4.34e-06 3.86e-06 5.90e-06 1.38e-05 1.76e-05 erg/cm2
Error 2.03e-07 1.42e-07 2.04e-07 6.69e-07 4.63e-07 8.33e-07 erg/cm2
Peak flux Power-law 3.05e-01 9.19e-02 1.52e-02 2.88e-03 4.14e-01 4.15e-01 ph/cm2/s
Error 2.76e-01 1.19e-01 4.99e-02 4.16e-02 4.11e-01 4.14e-01 ph/cm2/s
Fluence Cutoff-PL 3.48e-06 4.39e-06 3.85e-06 4.82e-06 1.36e-05 1.65e-05 erg/cm2
Error 2.52e-07 1.66e-07 2.09e-07 1.33e-06 5.80e-07 1.71e-06 erg/cm2
Peak flux Cutoff-PL 4.27e-01 1.05e-01 3.95e-05 1.77e-14 5.32e-01 5.31e-01 ph/cm2/s
Error 3.10e-01 1.42e-01 1.88e-02 0.00e+00 3.69e-01 3.69e-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 2.172 0.069 - - 2.22e-03 8.24e-05 44.780 57
CPL 1.993 -0.881 1.9 13.7 2.75e-03 1.72e-04 44.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.556 3.874 - - 9.81e-04 2.06e-03 52.910 57
CPL 1.000 0.000 50.0 0.0 6.02e-03 0.00e+00 55.120 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 664.708 -46.704 618.004
T90 582.664 1.220 583.884
T50 336.764 122.960 459.724
Peak 1.000 -46.900 -45.900
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
83.6433 +22.0044 0.0058 35.7 -154.4 20.5111 32.9 TRIG_00864882
------------------------------------------
Foreground time interval of the image:
-15.699 245.260 (delta_t = 260.959 [sec])
246.000 505.401 (delta_t = 259.401 [sec])
Background time interval of the image:
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
-46.704000 245.260000
246.000000 618.004000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.17228 ( -0.0689004 0.0698732 )
Norm@50keV : 2.21875E-03 ( -8.26866e-05 8.21159e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.78 using 59 PHA bins.
# Reduced chi-squared = 0.7856 for 57 degrees of freedom
# Null hypothesis probability = 8.799408e-01
Photon flux (15-150 keV) in 664 sec: 0.362052 ( -0.0131409 0.0132175 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38e-05 ( -4.6236e-07 4.64036e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-46.704000 245.260000
246.000000 618.004000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99261 ( -0.231179 -1.99261 )
Epeak [keV] : 1.94082 ( -0.565289 26.8722 )
Norm@50keV : 2.74517E-03 ( -0.0001411 0.000202656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.27 using 59 PHA bins.
# Reduced chi-squared = 0.7905 for 56 degrees of freedom
# Null hypothesis probability = 8.714241e-01
Photon flux (15-150 keV) in 664 sec: 0.358138 ( -0.015335 0.015369 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3633e-05 ( -5.86378e-07 5.727e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-46.704000 245.260000
246.000000 618.004000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.15430 ( )
beta : -9.37167 ( )
Epeak [keV] : 63.6677 ( )
Norm@50keV : 4.90465E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 129.51 using 59 PHA bins.
# Reduced chi-squared = 2.3547 for 55 degrees of freedom
# Null hypothesis probability = 6.001952e-08
Photon flux (15-150 keV) in 664 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] : 10.4988 ( )
R^2/D10^2 : 0.122999 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 263.45 using 59 PHA bins.
# Reduced chi-squared = 4.6220 for 57 degrees of freedom
# Null hypothesis probability = 2.660140e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.861e-06 1.199e-07
25- 50 4.948e-06 1.723e-07
50-150 2.968e-06 2.530e-07
15-150 9.777e-06 3.320e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.4418 (-5.74792 6.61839)
Norm : 1.80488 (-0.118531 0.129077)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.28 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.579339e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.007e-06 1.564e-07
25- 50 4.564e-06 1.524e-07
50-150 5.153e-06 3.901e-07
15-150 1.272e-05 4.416e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.94418 (-0.574559 0.598661)
R1^2/D10^2 : 0.904663 (-0.280902 0.459406)
kT2 [keV] : 20.6114 (-2.35496 3.09724)
R2^2/D10^2 : 6.22979E-03 (-0.00266622 0.00406062)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.92 using 59 PHA bins.
# Reduced chi-squared = 0.9077 for 55 degrees of freedom
# Null hypothesis probability = 6.684386e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.117e-06 2.898e-07
25- 50 4.418e-06 3.340e-07
50-150 5.613e-06 7.274e-07
15-150 1.315e-05 1.066e-06
Peak spectrum fit
Power-law model
Time interval is from -46.900 sec. to -45.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.55617 ( -2.21164 5.53711 )
Norm@50keV : 9.80590E-04 ( -0.000970191 0.00314758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.91 using 59 PHA bins.
# Reduced chi-squared = 0.9282 for 57 degrees of freedom
# Null hypothesis probability = 6.293275e-01
Photon flux (15-150 keV) in 1 sec: 0.414429 ( -0.414429 0.408127 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59494e-08 ( -1.57119e-08 2.35037e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -46.900 sec. to -45.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 6.01939E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.12 using 59 PHA bins.
# Reduced chi-squared = 0.9842 for 56 degrees of freedom
# Null hypothesis probability = 5.083151e-01
Photon flux (15-150 keV) in 1 sec: 0.531648 0.532419 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3019e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from -46.900 sec. to -45.900 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.99773 ( -5.00411 1.88102 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 18.6695 ( -8.35725 12.7478 )
Norm@50keV : 961.169 ( -961.169 83228.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.18 using 59 PHA bins.
# Reduced chi-squared = 0.9306 for 55 degrees of freedom
# Null hypothesis probability = 6.212516e-01
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] : 4.22831 (-2.04982 3.41967)
R^2/D10^2 : 9.86436 (-10.1406 400.477)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.57 using 59 PHA bins.
# Reduced chi-squared = 0.9047 for 57 degrees of freedom
# Null hypothesis probability = 6.783199e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.167e-08 8.535e-09
25- 50 4.921e-09 3.897e-09
50-150 8.286e-11 1.133e-10
15-150 1.667e-08 1.044e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.1840 (-10.0768 71.0219)
Norm : 14.9443 (-14.98 516.599)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.28 using 59 PHA bins.
# Reduced chi-squared = 0.9173 for 57 degrees of freedom
# Null hypothesis probability = 6.523303e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.037e-08 6.820e-09
25- 50 4.576e-09 3.919e-09
50-150 3.297e-10 5.965e-10
15-150 1.528e-08 1.107e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.44809 (-4.14637 3.48971)
R1^2/D10^2 : 7.78964 (-10.0172 396.767)
kT2 [keV] : 0.229235 (-0.229235 -0.229235)
R2^2/D10^2 : 1.40100E-05 (-1.42567e-05 -1.42567e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.60 using 59 PHA bins.
# Reduced chi-squared = 0.9382 for 55 degrees of freedom
# Null hypothesis probability = 6.052469e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.158e-08 8.745e-09
25- 50 5.604e-09 4.477e-09
50-150 1.251e-10 1.210e-10
15-150 1.731e-08 1.443e-08
Plot creation:
Tue Oct 2 21:49:34 EDT 2018