batgrbproduct analysis for trigger=844615
batgrbproduct Analysis for Trigger=844615
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): Wed Jun 27 02:31:26 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger844615/GCN5_download_cron
======================================================================
Trigger: 00844615 Segment: 000
BAT Trigger Time: 551694098.112 [s; MET]
Trigger Stop: 551694099.136 [s; MET]
UTC: 2018-06-26T08:21:16.945520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 243.567509280255 Dec: 14.7644605261108 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.71
Image Trigger?: NO
Rate S/N Ratio: 15.9687194226713 [ if not an image trigger ]
Image S/N Ratio: 11.71
Flight Position: [ source = BAT ]
RA: 243.567509280255 Dec: 14.7644605261108 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 243.568771521691 Dec: 14.7590701496152 [deg; J2000]
{ 16h 14m 16.5s , +14d 45' 32.7" }
+/- 0.79094045388477 [arcmin] (estimated 90% radius based on SNR)
+/- 0.274470094785407 [arcmin] (formal 1-sigma fit error)
SNR: 42.5233286680043
Angular difference between Flight and Ground position is 0.331610 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 29.9079998731613 +/- 1.36662506760594
Measured from: -6.47599983215332
to: 23.432000041008 [s; relative to TRIGTIME]
T50: 13.0119998455048 +/- 0.769355503205248
Measured from: -1.9119998216629
to: 11.1000000238419 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -3.69200003147125
to: -2.69200003147125 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.50800001621246
to: 25.7000000476837 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.828434 3.409342 1.841950 0.328581
0.082511 0.081516 0.068214 0.053694 [error]
Peak 0.118832 0.204224 0.126347 0.023728
0.014870 0.015845 0.014027 0.009835 [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 1.10e-06 1.49e-06 1.48e-06 2.66e-06 4.93e-06 6.73e-06 erg/cm2
Error 6.32e-08 5.03e-08 6.96e-08 2.68e-07 1.66e-07 3.22e-07 erg/cm2
Peak flux Power-law 1.58e+00 1.39e+00 8.37e-01 7.62e-01 4.13e+00 4.57e+00 ph/cm2/s
Error 2.35e-01 1.38e-01 1.07e-01 1.85e-01 4.09e-01 4.43e-01 ph/cm2/s
Fluence Cutoff-PL 1.03e-06 1.53e-06 1.50e-06 1.60e-06 4.80e-06 5.67e-06 erg/cm2
Error 7.86e-08 5.95e-08 7.38e-08 5.68e-07 1.93e-07 6.05e-07 erg/cm2
Peak flux Cutoff-PL 1.18e+00 1.64e+00 9.44e-01 1.88e-01 3.92e+00 3.95e+00 ph/cm2/s
Error 2.85e-01 1.86e-01 1.36e-01 1.30e-01 4.21e-01 3.32e-01 ph/cm2/s
Fluence Band 9.72e-07 1.56e-06 1.45e-06 2.17e-06 4.77e-06 6.18e-06 erg/cm2
Error 8.95e-08 6.69e-08 7.47e-08 3.81e-07 1.86e-07 4.34e-07 erg/cm2
Peak flux Band 1.18e+00 1.63e+00 9.43e-01 1.89e-01 3.92e+00 3.95e+00 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 2.006 0.063 - - 1.52e-02 5.26e-04 46.500 57
CPL 1.644 0.265 47.9 12.4 2.32e-02 7.22e-03 40.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.729 0.154 - - 3.08e-02 3.16e-03 62.020 57
CPL -0.021 0.926 55.9 9.2 2.47e-01 3.66e-01 46.530 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: 27.584000 sec.
T50 in the 50-300 keV band: 12.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 35.208 -9.508 25.700
T90 29.908 -6.476 23.432
T50 13.012 -1.912 11.100
Peak 1.000 -3.692 -2.692
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
243.5688 +14.7591 0.0046 41.4 167.1 5.8847 42.5 TRIG_00844615
------------------------------------------
Foreground time interval of the image:
-9.508 9.589 (delta_t = 19.097 [sec])
Background time interval of the image:
-188.511 -9.508 (delta_t = 179.003 [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 -9.508 sec. to 25.700 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00597 ( -0.0625337 0.0631701 )
Norm@50keV : 1.51931E-02 ( -0.000527294 0.000525348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.50 using 59 PHA bins.
# Reduced chi-squared = 0.8159 for 57 degrees of freedom
# Null hypothesis probability = 8.382384e-01
Photon flux (15-150 keV) in 35.21 sec: 2.28526 ( -0.0832709 0.08364 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.93482e-06 ( -1.65551e-07 1.65804e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.508 sec. to 25.700 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64365 ( -0.27391 0.256953 )
Epeak [keV] : 47.9147 ( -12.7003 12.0785 )
Norm@50keV : 2.31883E-02 ( -0.00587459 0.00856753 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.59 using 59 PHA bins.
# Reduced chi-squared = 0.7248 for 56 degrees of freedom
# Null hypothesis probability = 9.396761e-01
Photon flux (15-150 keV) in 35.21 sec: 2.22330 ( -0.09278 0.09323 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7956e-06 ( -1.93479e-07 1.92563e-07 ) ergs/cm2
Band function
Time interval is from -9.508 sec. to 25.700 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10427 ( -0.55516 1.17305 )
beta : -2.19764 ( -0.194507 0.138159 )
Epeak [keV] : 39.4157 ( -5.79447 8.90997 )
Norm@50keV : 4.96492E-02 ( -0.0292174 0.289494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.58 using 59 PHA bins.
# Reduced chi-squared = 0.6651 for 55 degrees of freedom
# Null hypothesis probability = 9.736373e-01
Photon flux (15-150 keV) in 35.21 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76849e-06 ( -4.76824e-06 -1.85838e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.8112 ( )
R^2/D10^2 : 0.528766 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 232.97 using 59 PHA bins.
# Reduced chi-squared = 4.0871 for 57 degrees of freedom
# Null hypothesis probability = 3.899838e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.485e-07 3.468e-08
25- 50 1.694e-06 6.320e-08
50-150 1.406e-06 1.055e-07
15-150 3.648e-06 1.259e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.2092 (-7.73207 9.13356)
Norm : 10.5024 (-0.604763 0.648427)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.25 using 59 PHA bins.
# Reduced chi-squared = 0.7764 for 57 degrees of freedom
# Null hypothesis probability = 8.911790e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.572e-07 4.982e-08
25- 50 1.562e-06 5.458e-08
50-150 2.152e-06 1.470e-07
15-150 4.672e-06 1.620e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.23365 (-0.747012 0.750557)
R1^2/D10^2 : 2.59072 (-0.741928 1.2136)
kT2 [keV] : 24.5382 (-3.43466 4.92608)
R2^2/D10^2 : 2.14476E-02 (-0.0107407 0.0181722)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.35 using 59 PHA bins.
# Reduced chi-squared = 0.8428 for 55 degrees of freedom
# Null hypothesis probability = 7.903425e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.721e-07 8.415e-08
25- 50 1.604e-06 1.238e-07
50-150 2.221e-06 3.817e-07
15-150 4.697e-06 4.630e-07
Peak spectrum fit
Power-law model
Time interval is from -3.692 sec. to -2.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72939 ( -0.151224 0.155922 )
Norm@50keV : 3.07783E-02 ( -0.00317597 0.00315186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.02 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.019215e-01
Photon flux (15-150 keV) in 1 sec: 4.13060 ( -0.408298 0.408893 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.84362e-07 ( -3.01962e-08 3.03958e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.692 sec. to -2.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.12631E-02 ( -1.0227 0.829915 )
Epeak [keV] : 55.9222 ( -7.0037 11.3019 )
Norm@50keV : 0.247167 ( -0.153374 0.57775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.53 using 59 PHA bins.
# Reduced chi-squared = 0.8309 for 56 degrees of freedom
# Null hypothesis probability = 8.123943e-01
Photon flux (15-150 keV) in 1 sec: 3.91782 ( -0.42056 0.42098 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.63164e-07 ( -3.1185e-08 3.1907e-08 ) ergs/cm2
Band function
Time interval is from -3.692 sec. to -2.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.15238E-02 ( -0.80796 1.15209 )
beta : -10.0000 ( 10 1.42109e-14 )
Epeak [keV] : 55.9102 ( -6.77135 11.2841 )
Norm@50keV : 0.247282 ( -0.153477 0.578752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.53 using 59 PHA bins.
# Reduced chi-squared = 0.8460 for 55 degrees of freedom
# Null hypothesis probability = 7.848120e-01
Photon flux (15-150 keV) in 1 sec: 3.91988 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.62989e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.2967 (-1.22454 1.35014)
R^2/D10^2 : 0.749398 (-0.226169 0.318286)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.81 using 59 PHA bins.
# Reduced chi-squared = 0.9090 for 57 degrees of freedom
# Null hypothesis probability = 6.694031e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.808e-08 4.995e-09
25- 50 9.908e-08 1.199e-08
50-150 1.122e-07 2.183e-08
15-150 2.394e-07 2.840e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 118.397 (-33.5125 53.6561)
Norm : 17.7917 (-2.07966 2.52283)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.08 using 59 PHA bins.
# Reduced chi-squared = 0.9487 for 57 degrees of freedom
# Null hypothesis probability = 5.854188e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.636e-08 6.340e-09
25- 50 8.275e-08 1.052e-08
50-150 1.467e-07 5.781e-08
15-150 2.758e-07 6.760e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.75078 (-2.76276 99.7918)
R1^2/D10^2 : 135.264 (-127.808 -128.58)
kT2 [keV] : 14.2389 (-1.79681 90.1854)
R2^2/D10^2 : 0.557934 (-0.55416 0.218204)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8473 for 55 degrees of freedom
# Null hypothesis probability = 7.826314e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.831e-08 1.191e-08
25- 50 9.175e-08 1.523e-08
50-150 1.215e-07 2.838e-08
15-150 2.515e-07 4.160e-08
Plot creation:
Wed Jun 27 02:35:21 EDT 2018