batgrbproduct analysis for trigger=778154
batgrbproduct Analysis for Trigger=778154
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 Oct 12 19:09:29 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger778154/GCN5_download_cron
======================================================================
Trigger: 00778154 Segment: 000
BAT Trigger Time: 529439587.008 [s; MET]
Trigger Stop: 529439587.264 [s; MET]
UTC: 2017-10-11T18:32:47.183100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 236.760536734419 Dec: -10.0707462179219 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.59
Image Trigger?: NO
Rate S/N Ratio: 40.8656334834051 [ if not an image trigger ]
Image S/N Ratio: 14.59
Flight Position: [ source = BAT ]
RA: 236.760536734419 Dec: -10.0707462179219 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 236.76465222834 Dec: -10.066836458908 [deg; J2000]
{ 15h 47m 03.5s , -10d 04' 00.6" }
+/- 0.958487189262815 [arcmin] (estimated 90% radius based on SNR)
+/- 0.257632364694634 [arcmin] (formal 1-sigma fit error)
SNR: 32.3164500489902
Angular difference between Flight and Ground position is 0.337847 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 2.66799998283386 +/- 0.463396136818244
Measured from: 0.0720000863075256
to: 2.74000006914139 [s; relative to TRIGTIME]
T50: 1.21599996089935 +/- 0.108811769854415
Measured from: 0.480000078678131
to: 1.69600003957748 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0759999752044678
to: 1.07599997520447 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0600000023841858
to: 3.58799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.615252 0.723196 0.476380 0.112628
0.025450 0.028497 0.025155 0.026480 [error]
Peak 0.233525 0.318374 0.237744 0.079559
0.014166 0.016324 0.014693 0.014343 [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 1.84e-07 3.02e-07 3.76e-07 9.29e-07 1.12e-06 1.79e-06 erg/cm2
Error 1.44e-08 1.42e-08 2.57e-08 1.36e-07 5.94e-08 1.56e-07 erg/cm2
Peak flux Power-law 2.25e+00 2.30e+00 1.66e+00 1.91e+00 6.96e+00 8.12e+00 ph/cm2/s
Error 2.20e-01 1.37e-01 1.24e-01 2.93e-01 3.96e-01 4.73e-01 ph/cm2/s
Fluence Cutoff-PL 1.79e-07 3.07e-07 3.78e-07 6.82e-07 1.10e-06 1.55e-06 erg/cm2
Error 1.71e-08 1.75e-08 2.64e-08 2.85e-07 7.06e-08 2.56e-07 erg/cm2
Peak flux Cutoff-PL 2.17e+00 2.36e+00 1.68e+00 1.42e+00 6.89e+00 7.63e+00 ph/cm2/s
Error 2.57e-01 1.64e-01 1.33e-01 4.49e-01 4.14e-01 7.71e-01 ph/cm2/s
Fluence Band 1.74e-07 3.10e-07 3.71e-07 8.27e-07 1.10e-06 1.69e-06 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 1.683 0.088 - - 3.32e-02 1.65e-03 43.500 57
CPL 1.501 0.309 129.9 0.0 4.13e-02 0.00e+00 42.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.475 0.101 - - 5.61e-02 3.28e-03 48.900 57
CPL 1.247 0.347 160.4 -42.9 7.37e-02 3.31e-02 47.870 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: 1.664000 sec.
T50 in the 50-300 keV band: 0.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 3.648 -0.060 3.588
T90 2.668 0.072 2.740
T50 1.216 0.480 1.696
Peak 1.000 0.076 1.076
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
236.7647 -10.0668 0.0060 22.0 -79.6 1.9795 32.3 TRIG_00778154
------------------------------------------
Foreground time interval of the image:
-0.060 3.588 (delta_t = 3.648 [sec])
Background time interval of the image:
-59.707 -0.060 (delta_t = 59.647 [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 -0.060 sec. to 3.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68291 ( -0.0875847 0.0885444 )
Norm@50keV : 3.31883E-02 ( -0.00165131 0.00164117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.50 using 59 PHA bins.
# Reduced chi-squared = 0.7632 for 57 degrees of freedom
# Null hypothesis probability = 9.060317e-01
Photon flux (15-150 keV) in 3.648 sec: 4.38179 ( -0.206423 0.206678 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12256e-06 ( -5.92333e-08 5.96641e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 3.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50064 ( -0.365248 0.252153 )
Epeak [keV] : 129.901 ( )
Norm@50keV : 4.13306E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.68 using 59 PHA bins.
# Reduced chi-squared = 0.7621 for 56 degrees of freedom
# Null hypothesis probability = 9.051062e-01
Photon flux (15-150 keV) in 3.648 sec: 4.33322 ( -0.22442 0.22418 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10213e-06 ( -7.07603e-08 7.04757e-08 ) ergs/cm2
Band function
Time interval is from -0.060 sec. to 3.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.749536 ( -0.0914717 -0.0914717 )
beta : -1.72496 ( 1.72213 0.104086 )
Epeak [keV] : 27.3239 ( -29.4193 85.4995 )
Norm@50keV : 2.29379 ( -2.2938 3441.5 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.00 using 59 PHA bins.
# Reduced chi-squared = 0.7636 for 55 degrees of freedom
# Null hypothesis probability = 9.012172e-01
Photon flux (15-150 keV) in 3.648 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10255e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8820 ( )
R^2/D10^2 : 0.800744 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 143.09 using 59 PHA bins.
# Reduced chi-squared = 2.5104 for 57 degrees of freedom
# Null hypothesis probability = 2.373744e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.028e-07 9.831e-09
25- 50 3.506e-07 1.932e-08
50-150 3.659e-07 3.562e-08
15-150 8.193e-07 4.779e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 144.020 (-31.4608 39.7338)
Norm : 17.9046 (-0.977841 1.22663)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7682 for 57 degrees of freedom
# Null hypothesis probability = 9.005486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.683e-07 1.279e-08
25- 50 3.101e-07 2.681e-08
50-150 6.017e-07 1.808e-07
15-150 1.080e-06 2.030e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.49136 (-1.16339 1.3075)
R1^2/D10^2 : 6.37253 (-2.88514 6.62309)
kT2 [keV] : 23.7075 (-4.00522 6.82517)
R2^2/D10^2 : 6.83948E-02 (-0.0408635 0.0704095)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.86 using 59 PHA bins.
# Reduced chi-squared = 0.8702 for 55 degrees of freedom
# Null hypothesis probability = 7.416745e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.696e-07 3.267e-08
25- 50 3.084e-07 4.372e-08
50-150 6.003e-07 1.211e-07
15-150 1.078e-06 1.709e-07
Peak spectrum fit
Power-law model
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47498 ( -0.100377 0.101042 )
Norm@50keV : 5.61175E-02 ( -0.00329114 0.0032772 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.90 using 59 PHA bins.
# Reduced chi-squared = 0.8579 for 57 degrees of freedom
# Null hypothesis probability = 7.686745e-01
Photon flux (15-150 keV) in 1 sec: 6.95960 ( -0.396156 0.396371 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.34608e-07 ( -3.49408e-08 3.52053e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24683 ( -0.415586 0.278334 )
Epeak [keV] : 160.355 ( -74.5729 -160.356 )
Norm@50keV : 7.37068E-02 ( -0.0200137 0.0460939 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.87 using 59 PHA bins.
# Reduced chi-squared = 0.8548 for 56 degrees of freedom
# Null hypothesis probability = 7.718380e-01
Photon flux (15-150 keV) in 1 sec: 6.88570 ( -0.41461 0.41405 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.23515e-07 ( -4.0011e-08 3.9814e-08 ) ergs/cm2
Band function
Time interval is from 0.076 sec. to 1.076 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.35287 ( -11.9962 -4.11241 )
beta : -1.57395 ( -0.138354 0.125554 )
Epeak [keV] : 27.4684 ( -5.16055 3.60179 )
Norm@50keV : 227.122 ( -227.057 1415.82 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.44 using 59 PHA bins.
# Reduced chi-squared = 0.8081 for 55 degrees of freedom
# Null hypothesis probability = 8.448156e-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] : 14.2479 ( )
R^2/D10^2 : 0.938364 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.91 using 59 PHA bins.
# Reduced chi-squared = 2.0336 for 57 degrees of freedom
# Null hypothesis probability = 6.675919e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.017e-08 4.435e-09
25- 50 1.520e-07 1.115e-08
50-150 2.050e-07 2.470e-08
15-150 3.971e-07 2.845e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-32.663 -200)
Norm : 28.3944 (-1.59848 1.59848)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.21 using 59 PHA bins.
# Reduced chi-squared = 0.8634 for 57 degrees of freedom
# Null hypothesis probability = 7.587157e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.089e-08 4.435e-09
25- 50 1.364e-07 9.300e-09
50-150 2.991e-07 6.725e-08
15-150 5.063e-07 7.265e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.59198 (-1.40451 1.56632)
R1^2/D10^2 : 5.63902 (-2.44211 5.2653)
kT2 [keV] : 29.5171 (-6.3495 13.2033)
R2^2/D10^2 : 5.82408E-02 (-0.0401746 0.0794756)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.03 using 59 PHA bins.
# Reduced chi-squared = 0.8551 for 55 degrees of freedom
# Null hypothesis probability = 7.689760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.439e-08 1.138e-08
25- 50 1.390e-07 2.443e-08
50-150 3.240e-07 1.105e-07
15-150 5.274e-07 1.477e-07
Plot creation:
Thu Oct 12 19:13:47 EDT 2017