batgrbproduct analysis for trigger=853882
batgrbproduct Analysis for Trigger=853882
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): Sun Aug 19 09:28:24 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger853882/GCN5_download_cron
======================================================================
Trigger: 00853882 Segment: 000
BAT Trigger Time: 556288240 [s; MET]
Trigger Stop: 556288368 [s; MET]
UTC: 2018-08-18T12:30:18.552260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 104.235169748593 Dec: 39.328619125846 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.17
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.17
Flight Position: [ source = BAT ]
RA: 104.235169748593 Dec: 39.328619125846 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 104.227137241559 Dec: 39.3097616039524 [deg; J2000]
{ 06h 56m 54.5s , +39d 18' 35.1" }
+/- 1.65306750644118 [arcmin] (estimated 90% radius based on SNR)
+/- 0.69288938679163 [arcmin] (formal 1-sigma fit error)
SNR: 14.8345603959692
Angular difference between Flight and Ground position is 1.191302 arcmin
Partial Coding Fraction: 0.890625 [ including projection effects ]
Duration
T90: 134.40399992466 +/- 9.78261668948041
Measured from: -86.7399998903275
to: 47.6640000343323 [s; relative to TRIGTIME]
T50: 110.508000016212 +/- 4.48591761445796
Measured from: -80.9519999027252
to: 29.5560001134872 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -82.1119999885559
to: -81.1119999885559 [s; relative to TRIGTIME]
Total Fluence
Measured from: -93.5800000429153
to: 62.7439999580383 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.229164 1.667712 0.888055 0.160156
0.087607 0.090796 0.078267 0.068091 [error]
Peak 0.044197 0.065864 0.024040 0.016869
0.007490 0.008201 0.006816 0.005697 [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 4.12e-07 6.43e-07 7.55e-07 1.72e-06 2.31e-06 3.52e-06 erg/cm2
Error 4.33e-08 4.34e-08 7.58e-08 3.53e-07 1.78e-07 4.23e-07 erg/cm2
Peak flux Power-law 4.49e-01 3.91e-01 2.34e-01 2.10e-01 1.16e+00 1.28e+00 ph/cm2/s
Error 1.10e-01 6.35e-02 5.64e-02 9.94e-02 1.89e-01 2.12e-01 ph/cm2/s
Fluence Cutoff-PL 3.79e-07 6.93e-07 7.57e-07 6.15e-07 2.17e-06 2.44e-06 erg/cm2
Error 5.00e-08 5.84e-08 8.46e-08 4.97e-07 2.06e-07 5.36e-07 erg/cm2
Peak flux Cutoff-PL 4.52e-01 3.92e-01 2.32e-01 2.05e-01 1.16e+00 1.28e+00 ph/cm2/s
Error 1.10e-01 6.43e-02 5.64e-02 1.37e-01 1.88e-01 2.31e-01 ph/cm2/s
Fluence Band 3.63e-07 7.14e-07 7.20e-07 1.16e-06 2.20e-06 2.95e-06 erg/cm2
Error 5.31e-08 4.85e-08 8.43e-08 -------- 1.46e-07 -------- 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 1.768 0.120 - - 1.60e-03 1.19e-04 47.270 57
CPL 1.088 0.554 60.6 30.3 3.76e-03 2.94e-03 42.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.744 0.290 - - 8.63e-03 1.60e-03 63.600 57
CPL 2.013 -0.368 5.5 0.0 6.08e-03 0.00e+00 63.470 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: 159.936000 sec.
T50 in the 50-300 keV band: 114.816000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 156.324 -93.580 62.744
T90 134.404 -86.740 47.664
T50 110.508 -80.952 29.556
Peak 1.000 -82.112 -81.112
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
104.2271 +39.3098 0.0129 29.4 -8.7 2.8008 14.8 TRIG_00853882
------------------------------------------
Foreground time interval of the image:
-77.499 62.744 (delta_t = 140.243 [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
Time interval is from -93.580 sec. to 62.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76754 ( -0.119098 0.121457 )
Norm@50keV : 1.60376E-03 ( -0.000119767 0.000118637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.27 using 59 PHA bins.
# Reduced chi-squared = 0.8293 for 57 degrees of freedom
# Null hypothesis probability = 8.174012e-01
Photon flux (15-150 keV) in 156.3 sec: 0.218275 ( -0.0148856 0.0148994 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31085e-06 ( -1.77205e-07 1.78845e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -93.580 sec. to 62.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08819 ( -0.593072 0.51524 )
Epeak [keV] : 60.5851 ( -11.524 48.9768 )
Norm@50keV : 3.76033E-03 ( -0.00176173 0.00410939 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.02 using 59 PHA bins.
# Reduced chi-squared = 0.7503 for 56 degrees of freedom
# Null hypothesis probability = 9.171262e-01
Photon flux (15-150 keV) in 156.3 sec: 0.211691 ( -0.015685 0.015666 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16869e-06 ( -2.04003e-07 2.07269e-07 ) ergs/cm2
Band function
Time interval is from -93.580 sec. to 62.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.338787 ( -1.07938 3.94938 )
beta : -2.12915 ( 2.12639 0.292878 )
Epeak [keV] : 43.8975 ( -15.7983 32.6325 )
Norm@50keV : 1.14787E-02 ( -0.0114683 12.8484 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.34 using 59 PHA bins.
# Reduced chi-squared = 0.7335 for 55 degrees of freedom
# Null hypothesis probability = 9.305902e-01
Photon flux (15-150 keV) in 156.3 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19667e-06 ( -2.19558e-06 -9.86722e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7727 (-0.909919 1.00178)
R^2/D10^2 : 5.65206E-02 (-0.0148845 0.0198478)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.50 using 59 PHA bins.
# Reduced chi-squared = 1.325 for 57 degrees of freedom
# Null hypothesis probability = 5.102570e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.585e-07 3.298e-08
25- 50 7.952e-07 6.072e-08
50-150 6.541e-07 1.071e-07
15-150 1.708e-06 1.374e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 105.178 (-23.9555 36.8431)
Norm : 0.954657 (-0.0863945 0.099643)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.32 using 59 PHA bins.
# Reduced chi-squared = 0.7425 for 57 degrees of freedom
# Null hypothesis probability = 9.265418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.899e-07 4.415e-08
25- 50 6.810e-07 5.471e-08
50-150 1.135e-06 3.605e-07
15-150 2.206e-06 3.962e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.66404 (-1.69838 1.59911)
R1^2/D10^2 : 0.195642 (-0.0852704 0.223688)
kT2 [keV] : 25.0176 (-6.97142 17.3572)
R2^2/D10^2 : 2.24041E-03 (-0.001869 0.00628435)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.58 using 59 PHA bins.
# Reduced chi-squared = 0.7559 for 55 degrees of freedom
# Null hypothesis probability = 9.094000e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.521e-07 8.190e-08
25- 50 7.254e-07 1.590e-07
50-150 1.118e-06 5.184e-07
15-150 2.196e-06 6.894e-07
Peak spectrum fit
Power-law model
Time interval is from -82.112 sec. to -81.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74407 ( -0.284361 0.294874 )
Norm@50keV : 8.63142E-03 ( -0.00162284 0.00157535 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.60 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.552599e-01
Photon flux (15-150 keV) in 1 sec: 1.16458 ( -0.188574 0.188602 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.96731e-08 ( -1.52239e-08 1.55979e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -82.112 sec. to -81.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01298 ( -1.27726 -2.01298 )
Epeak [keV] : 5.52169 ( )
Norm@50keV : 6.08254E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.47 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 56 degrees of freedom
# Null hypothesis probability = 2.300616e-01
Photon flux (15-150 keV) in 1 sec: 1.16477 ( -0.188099 0.18808 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.91683e-08 ( -1.67254e-08 1.58762e-08 ) ergs/cm2
Band function
Time interval is from -82.112 sec. to -81.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.79712 ( -5.921 -4.79712 )
beta : -2.20916 ( -0.642109 0.45937 )
Epeak [keV] : 28.1997 ( -9.0883 4.8055 )
Norm@50keV : 433.811 ( -68.727 6193.93 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.80 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 55 degrees of freedom
# Null hypothesis probability = 3.057890e-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] : 9.05236 (-1.41107 1.80172)
R^2/D10^2 : 0.817275 (-0.414402 0.752963)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.01 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.155133e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.308e-08 3.430e-09
25- 50 2.805e-08 7.245e-09
50-150 1.089e-08 4.999e-09
15-150 5.202e-08 1.352e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.4392 (-44.2175 -99.6511)
Norm : 5.17125 (-1.10775 1.4333)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.53 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.301732e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.352e-08 3.046e-09
25- 50 2.335e-08 7.075e-09
50-150 3.771e-08 2.081e-08
15-150 7.457e-08 2.680e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.82543 (-1.22492 1.54222)
R1^2/D10^2 : 1.30145 (-0.712058 1.65144)
kT2 [keV] : 199.737 (-199.737 -199.737)
R2^2/D10^2 : 1.52148E-04 (-6.08897e-05 0.00364843)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.50 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.38 using 59 PHA bins.
# Reduced chi-squared = 0.9728 for 55 degrees of freedom
# Reduced chi-squared = 0.9706 for 55 degrees of freedom
# Null hypothesis probability = 5.319505e-01
# Null hypothesis probability = 5.366943e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.449e-08 5.472e-09
25- 50 2.522e-08 1.047e-08
50-150 4.736e-08 3.667e-08
15-150 8.707e-08 4.199e-08
Plot creation:
Sun Aug 19 09:32:41 EDT 2018