batgrbproduct analysis for trigger=785850
batgrbproduct Analysis for Trigger=785850
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): Sat Nov 4 21:58:22 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger785850/GCN5_download_cron
======================================================================
Trigger: 00785850 Segment: 000
BAT Trigger Time: 531443452.012 [s; MET]
Trigger Stop: 531443452.076 [s; MET]
UTC: 2017-11-03T23:10:32.067600 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 249.535607366346 Dec: -10.2151202797463 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: NO
Rate S/N Ratio: 77.2657750883274 [ if not an image trigger ]
Image S/N Ratio: 9.35
Flight Position: [ source = BAT ]
RA: 249.535607366346 Dec: -10.2151202797463 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 249.509840200756 Dec: -10.2063610430431 [deg; J2000]
{ 16h 38m 02.4s , -10d 12' 22.9" }
+/- 1.45615905322818 [arcmin] (estimated 90% radius based on SNR)
+/- 0.602935362243535 [arcmin] (formal 1-sigma fit error)
SNR: 17.7812763020579
Angular difference between Flight and Ground position is 1.609753 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 3.90399998426437 +/- 1.10585354902182
Measured from: -0.323999881744385
to: 3.58000010251999 [s; relative to TRIGTIME]
T50: 0.319999992847443 +/- 0.961199290916573
Measured from: -0.00399988889694214
to: 0.3160001039505 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.368000030517578
to: 0.631999969482422 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.37200003862381
to: 4.66799998283386 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.145704 0.210928 0.162426 0.086782
0.019787 0.019512 0.017746 0.015386 [error]
Peak 0.104118 0.157324 0.150189 0.065936
0.010462 0.011296 0.011177 0.009730 [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 4.11e-08 8.46e-08 1.36e-07 4.89e-07 3.77e-07 7.51e-07 erg/cm2
Error 7.70e-09 9.31e-09 1.73e-08 1.41e-07 4.27e-08 1.52e-07 erg/cm2
Peak flux Power-law 9.24e-01 1.13e+00 1.00e+00 1.53e+00 3.59e+00 4.59e+00 ph/cm2/s
Error 1.35e-01 9.77e-02 9.00e-02 3.00e-01 2.72e-01 3.78e-01 ph/cm2/s
Fluence Cutoff-PL 4.15e-08 8.49e-08 1.36e-07 4.79e-07 3.76e-07 7.40e-07 erg/cm2
Error 7.79e-09 9.34e-09 1.72e-08 2.05e-07 4.23e-08 2.47e-07 erg/cm2
Peak flux Cutoff-PL 9.27e-01 1.13e+00 1.00e+00 1.51e+00 3.59e+00 4.57e+00 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- 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 1.314 0.184 - - 7.60e-03 7.59e-04 51.890 57
CPL 1.316 0.189 9999.4 0.0 7.61e-03 4.04e-03 51.910 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.174 0.136 - - 3.07e-02 2.29e-03 56.120 57
CPL 1.169 0.270 9999.2 0.0 3.08e-02 8.86e-03 56.140 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: 0.576000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 5.040 -0.372 4.668
T90 3.904 -0.324 3.580
T50 0.320 -0.004 0.316
Peak 1.000 -0.368 0.632
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
249.5098 -10.2064 0.0108 21.5 -96.4 0.6467 17.8 TRIG_00785850
------------------------------------------
Foreground time interval of the image:
-0.372 4.668 (delta_t = 5.040 [sec])
Background time interval of the image:
-239.012 -55.922 (delta_t = 183.090 [sec])
-55.012 -0.372 (delta_t = 54.640 [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 -0.372 sec. to 4.668 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31440 ( -0.18432 0.182814 )
Norm@50keV : 7.59710E-03 ( -0.000760081 0.000757888 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.89 using 59 PHA bins.
# Reduced chi-squared = 0.9104 for 57 degrees of freedom
# Null hypothesis probability = 6.666176e-01
Photon flux (15-150 keV) in 5.04 sec: 0.908802 ( -0.0926393 0.0928586 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77055e-07 ( -4.24468e-08 4.28843e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.372 sec. to 4.668 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31582 ( -0.197965 0.179498 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 7.61212E-03 ( -0.00270514 0.00536937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.91 using 59 PHA bins.
# Reduced chi-squared = 0.9269 for 56 degrees of freedom
# Null hypothesis probability = 6.305304e-01
Photon flux (15-150 keV) in 5.04 sec: 0.909153 ( -0.093326 0.092137 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.75946e-07 ( -4.12327e-08 4.32941e-08 ) ergs/cm2
Band function
Time interval is from -0.372 sec. to 4.668 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.77751 ( -4.77751 -4.77751 )
beta : -1.37628 ( -0.210663 0.202336 )
Epeak [keV] : 24.7186 ( -24.7186 6.11133 )
Norm@50keV : 501.369 ( -49.6406 2.62518e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.76 using 59 PHA bins.
# Reduced chi-squared = 0.9230 for 55 degrees of freedom
# Null hypothesis probability = 6.370752e-01
Photon flux (15-150 keV) in 5.04 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] : 16.7656 (-2.34129 2.86096)
R^2/D10^2 : 7.05734E-02 (-0.0288848 0.0471141)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.70 using 59 PHA bins.
# Reduced chi-squared = 1.433 for 57 degrees of freedom
# Null hypothesis probability = 1.764140e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.044e-08 4.287e-09
25- 50 8.942e-08 1.250e-08
50-150 1.787e-07 3.354e-08
15-150 2.885e-07 4.163e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-37.3205 -200)
Norm : 3.74675 (-0.375667 0.375667)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.544738e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.703e-08 2.575e-08
25- 50 9.047e-08 4.974e-08
50-150 1.984e-07 1.075e-07
15-150 3.359e-07 1.809e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.10150 (-2.49878 2.02941)
R1^2/D10^2 : 0.599407 (-0.385848 1.44162)
kT2 [keV] : 41.8252 (-17.1385 -42.6108)
R2^2/D10^2 : 3.16327E-03 (-0.00250887 0.0119157)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.92 using 59 PHA bins.
# Reduced chi-squared = 0.9439 for 55 degrees of freedom
# Null hypothesis probability = 5.931833e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.967e-08 1.620e-08
25- 50 8.880e-08 3.685e-08
50-150 2.605e-07 1.326e-07
15-150 3.890e-07 1.681e-07
Peak spectrum fit
Power-law model
Time interval is from -0.368 sec. to 0.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17359 ( -0.136847 0.135833 )
Norm@50keV : 3.06691E-02 ( -0.00228897 0.00228781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 0.9846 for 57 degrees of freedom
# Null hypothesis probability = 5.080055e-01
Photon flux (15-150 keV) in 1 sec: 3.58712 ( -0.271389 0.271664 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13516e-07 ( -2.6987e-08 2.72083e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.368 sec. to 0.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16926 ( -0.353646 0.185774 )
Epeak [keV] : 9999.25 ( -9999.26 -9999.26 )
Norm@50keV : 3.08206E-02 ( -0.00229724 0.0154314 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.14 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.697232e-01
Photon flux (15-150 keV) in 1 sec: 3.58736 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13724e-07 ( -2.7093e-08 2.6699e-08 ) ergs/cm2
Band function
Time interval is from -0.368 sec. to 0.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.39498 ( -4.39498 -4.39498 )
beta : -1.23423 ( -0.156879 0.151417 )
Epeak [keV] : 26.3202 ( -26.3202 5.57566 )
Norm@50keV : 659.198 ( -49.023 7.15796e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9913 for 55 degrees of freedom
# Null hypothesis probability = 4.928333e-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] : 18.8957 (-2.06758 2.40766)
R^2/D10^2 : 0.195004 (-0.062143 0.0890893)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.27 using 59 PHA bins.
# Reduced chi-squared = 1.8293 for 57 degrees of freedom
# Null hypothesis probability = 1.346842e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.371e-08 1.950e-09
25- 50 6.570e-08 7.235e-09
50-150 1.722e-07 2.650e-08
15-150 2.516e-07 2.670e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-17.4019 -200)
Norm : 14.5819 (-1.11101 1.11101)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.51 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 57 degrees of freedom
# Null hypothesis probability = 3.673634e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.632e-08 3.825e-09
25- 50 6.986e-08 9.790e-09
50-150 1.532e-07 5.473e-08
15-150 2.594e-07 6.910e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.26419 (-1.48879 2.01086)
R1^2/D10^2 : 2.92874 (-1.5884 3.57748)
kT2 [keV] : 35.3330 (-7.8752 17.786)
R2^2/D10^2 : 2.33563E-02 (-0.0157707 0.0277502)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9829 for 55 degrees of freedom
# Null hypothesis probability = 5.106013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.986e-08 9.615e-09
25- 50 6.477e-08 1.600e-08
50-150 2.258e-07 8.855e-08
15-150 3.204e-07 9.985e-08
Plot creation:
Sat Nov 4 22:31:49 EDT 2017