batgrbproduct analysis for trigger=900285
batgrbproduct Analysis for Trigger=900285
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 Apr 25 16:03:21 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger900285/GCN5_download_cron
======================================================================
Trigger: 00900285 Segment: 000
BAT Trigger Time: 577792865.984 [s; MET]
Trigger Stop: 577792867.008 [s; MET]
UTC: 2019-04-24T10:00:43.191560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.6808760446314 Dec: 20.2334856376405 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.72
Image Trigger?: NO
Rate S/N Ratio: 15.1657508881031 [ if not an image trigger ]
Image S/N Ratio: 6.72
Flight Position: [ source = BAT ]
RA: 48.6808760446314 Dec: 20.2334856376405 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 48.6925264972252 Dec: 20.2388717586469 [deg; J2000]
{ 03h 14m 46.2s , +20d 14' 19.9" }
+/- 1.4133774428187 [arcmin] (estimated 90% radius based on SNR)
+/- 0.543620329277125 [arcmin] (formal 1-sigma fit error)
SNR: 18.5551244578905
Angular difference between Flight and Ground position is 0.731174 arcmin
Partial Coding Fraction: 0.4101562 [ including projection effects ]
Duration
T90: 10.6640000343323 +/- 2.25634473343057
Measured from: -0.803999900817871
to: 9.8600001335144 [s; relative to TRIGTIME]
T50: 5.19200003147125 +/- 0.916375441274666
Measured from: 1.35200011730194
to: 6.54400014877319 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.09600007534027
to: 2.09600007534027 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.31199991703033
to: 12.0440000295639 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.449041 0.690788 0.564510 0.137256
0.046367 0.049910 0.044907 0.036049 [error]
Peak 0.047044 0.088191 0.084938 0.022237
0.012712 0.014085 0.013490 0.011027 [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 1.52e-07 2.88e-07 4.23e-07 1.33e-06 1.20e-06 2.19e-06 erg/cm2
Error 2.06e-08 2.40e-08 4.25e-08 2.85e-07 1.04e-07 3.17e-07 erg/cm2
Peak flux Power-law 4.77e-01 6.17e-01 5.84e-01 9.77e-01 2.00e+00 2.65e+00 ph/cm2/s
Error 1.59e-01 1.24e-01 1.00e-01 3.71e-01 3.32e-01 4.46e-01 ph/cm2/s
Fluence Cutoff-PL 1.43e-07 3.00e-07 4.35e-07 7.69e-07 1.17e-06 1.65e-06 erg/cm2
Error 2.40e-08 2.95e-08 4.69e-08 4.64e-07 1.13e-07 6.08e-07 erg/cm2
Peak flux Cutoff-PL 4.80e-01 6.18e-01 5.83e-01 9.64e-01 2.00e+00 2.64e+00 ph/cm2/s
Error 1.61e-01 1.27e-01 1.11e-01 4.01e-01 2.49e-01 5.59e-01 ph/cm2/s
Fluence Band 1.37e-07 3.10e-07 4.17e-07 1.14e-06 1.17e-06 2.01e-06 erg/cm2
Error 2.67e-08 -------- 4.41e-08 -------- 1.08e-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 1.448 0.134 - - 9.36e-03 7.43e-04 54.360 57
CPL 1.077 0.503 125.8 -38.4 1.44e-02 9.32e-03 52.850 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.080 0.285 - - 1.73e-02 2.76e-03 52.640 57
CPL 1.080 0.291 9999.4 0.0 1.74e-02 1.55e-02 52.640 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: 6.528000 sec.
T50 in the 50-300 keV band: 3.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 13.356 -1.312 12.044
T90 10.664 -0.804 9.860
T50 5.192 1.352 6.544
Peak 1.000 1.096 2.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
48.6925 +20.2389 0.0104 33.7 -74.9 1.8732 18.6 TRIG_00900285
------------------------------------------
Foreground time interval of the image:
-1.312 12.044 (delta_t = 13.356 [sec])
Background time interval of the image:
-239.984 -1.312 (delta_t = 238.672 [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 -1.312 sec. to 12.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44835 ( -0.133404 0.13384 )
Norm@50keV : 9.35860E-03 ( -0.0007438 0.000742013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.36 using 59 PHA bins.
# Reduced chi-squared = 0.9538 for 57 degrees of freedom
# Null hypothesis probability = 5.745765e-01
Photon flux (15-150 keV) in 13.36 sec: 1.15285 ( -0.0925313 0.0926486 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19682e-06 ( -1.0402e-07 1.04644e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.312 sec. to 12.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07703 ( -0.573727 0.433139 )
Epeak [keV] : 125.796 ( -48.9919 -125.796 )
Norm@50keV : 1.44025E-02 ( -0.00550244 0.0131281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9437 for 56 degrees of freedom
# Null hypothesis probability = 5.950419e-01
Photon flux (15-150 keV) in 13.36 sec: 1.13652 ( -0.09535 0.09529 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16755e-06 ( -1.13505e-07 1.12843e-07 ) ergs/cm2
Band function
Time interval is from -1.312 sec. to 12.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.33229 ( -4.23779 -1.33693 )
beta : -1.58290 ( 1.58283 0.191202 )
Epeak [keV] : 34.8796 ( -13.7085 50.402 )
Norm@50keV : 0.756035 ( -0.777058 199.273 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.36 using 59 PHA bins.
# Reduced chi-squared = 0.9337 for 55 degrees of freedom
# Null hypothesis probability = 6.146400e-01
Photon flux (15-150 keV) in 13.36 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17366e-06 ( -1.17357e-06 -1.08354e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.5278 (-1.55382 1.74507)
R^2/D10^2 : 0.117683 (-0.0366126 0.0525576)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.47 using 59 PHA bins.
# Reduced chi-squared = 1.535 for 57 degrees of freedom
# Null hypothesis probability = 5.834026e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.888e-08 1.140e-08
25- 50 3.234e-07 3.614e-08
50-150 5.385e-07 8.196e-08
15-150 9.408e-07 9.492e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-39.6161 -200)
Norm : 4.73863 (-0.371804 0.371804)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.64 using 59 PHA bins.
# Reduced chi-squared = 0.9587 for 57 degrees of freedom
# Null hypothesis probability = 5.640102e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.583e-07 1.530e-08
25- 50 3.046e-07 3.741e-08
50-150 6.680e-07 2.745e-07
15-150 1.131e-06 2.882e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.69629 (-1.72344 2.04495)
R1^2/D10^2 : 0.858818 (-0.439589 1.09825)
kT2 [keV] : 28.4847 (-6.51666 15.3293)
R2^2/D10^2 : 1.10374E-02 (-0.00833868 0.0179962)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.29 using 59 PHA bins.
# Reduced chi-squared = 0.9325 for 55 degrees of freedom
# Null hypothesis probability = 6.172553e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.385e-07 4.864e-08
25- 50 3.114e-07 9.512e-08
50-150 7.254e-07 3.523e-07
15-150 1.175e-06 4.395e-07
Peak spectrum fit
Power-law model
Time interval is from 1.096 sec. to 2.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07951 ( -0.291316 0.279081 )
Norm@50keV : 1.73107E-02 ( -0.00276946 0.00275349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.64 using 59 PHA bins.
# Reduced chi-squared = 0.9235 for 57 degrees of freedom
# Null hypothesis probability = 6.391514e-01
Photon flux (15-150 keV) in 1 sec: 2.00414 ( -0.330717 0.332513 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82193e-07 ( -3.08439e-08 3.10109e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.096 sec. to 2.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07953 ( -0.305033 0.277888 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.74075E-02 ( -0.00273195 0.0283059 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.64 using 59 PHA bins.
# Reduced chi-squared = 0.9401 for 56 degrees of freedom
# Null hypothesis probability = 6.026839e-01
Photon flux (15-150 keV) in 1 sec: 2.00495 ( -0.16812 0.33021 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82129e-07 ( -3.1161e-08 3.1157e-08 ) ergs/cm2
Band function
Time interval is from 1.096 sec. to 2.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.87696 ( -4.87696 -4.87696 )
beta : -1.14305 ( -0.331848 0.32037 )
Epeak [keV] : 28.0243 ( -28.0243 10.9146 )
Norm@50keV : 530.857 ( -83.3311 4.95305e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9554 for 55 degrees of freedom
# Null hypothesis probability = 5.688970e-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] : 23.5056 (-5.13683 7.15456)
R^2/D10^2 : 5.62020E-02 (-0.0312736 0.0670515)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.29 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.641322e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.568e-09 2.162e-09
25- 50 3.058e-08 9.025e-09
50-150 1.260e-07 3.847e-08
15-150 1.622e-07 4.191e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-45.2705 -200)
Norm : 8.32826 (-1.36131 1.36131)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.97 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.353148e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.074e-08 1.188e-08
25- 50 3.989e-08 2.237e-08
50-150 8.749e-08 4.870e-08
15-150 1.481e-07 8.360e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.64423 (-2.7927 3.84539)
R1^2/D10^2 : 1.31138 (-0.989874 3.44633)
kT2 [keV] : 38.7252 (-12.3161 42.0112)
R2^2/D10^2 : 1.07051E-02 (-0.00910346 0.0246638)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.96 using 59 PHA bins.
# Reduced chi-squared = 0.9265 for 55 degrees of freedom
# Null hypothesis probability = 6.298012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.549e-08 9.010e-09
25- 50 3.591e-08 1.950e-08
50-150 1.363e-07 7.480e-08
15-150 1.877e-07 9.935e-08
Plot creation:
Thu Apr 25 16:09:49 EDT 2019