batgrbproduct analysis for trigger=848584
batgrbproduct Analysis for Trigger=848584
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 Jul 19 16:16:05 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger848584/GCN5_download_cron
======================================================================
Trigger: 00848584 Segment: 000
BAT Trigger Time: 553615496 [s; MET]
Trigger Stop: 553615984 [s; MET]
UTC: 2018-07-18T14:04:34.716080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.070082686342 Dec: -47.8094525873492 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.39
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.39
Flight Position: [ source = BAT ]
RA: 248.070082686342 Dec: -47.8094525873492 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.136728611436 Dec: -47.9144490743842 [deg; J2000]
{ 16h 32m 32.8s , -47d 54' 52.0" }
+/- 6.49711859474969 [arcmin] (estimated 90% radius based on SNR)
+/- 4.88775722041904 [arcmin] (formal 1-sigma fit error)
SNR: 2.09936848762923
Angular difference between Flight and Ground position is 6.847260 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 376.524000048637 +/- 160.003206575211
Measured from: 2.06000006198883
to: 378.584000110626 [s; relative to TRIGTIME]
T50: 171.207999944687 +/- 159.625544247162
Measured from: 54.672000169754
to: 225.880000114441 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 349.524000048637
to: 350.524000048637 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.4559999704361
to: 413.72000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.317019 0.897505 0.001402 0.286109
0.135550 0.130588 0.111158 0.104051 [error]
Peak 0.014330 0.009617 0.015014 0.008833
0.006748 0.006204 0.005376 0.004946 [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 3.81e-07 3.21e-07 1.84e-07 1.57e-07 9.56e-07 1.04e-06 erg/cm2
Error 6.44e-08 6.42e-08 7.58e-08 1.18e-07 1.88e-07 2.52e-07 erg/cm2
Peak flux Power-law 7.91e-02 9.66e-02 8.55e-02 1.30e-01 3.07e-01 3.91e-01 ph/cm2/s
Error 7.31e-02 7.39e-02 4.36e-02 1.80e-01 1.40e-01 1.83e-01 ph/cm2/s
Fluence Cutoff-PL 3.75e-07 3.66e-07 9.90e-08 4.72e-09 8.45e-07 8.45e-07 erg/cm2
Error 6.96e-08 8.31e-08 1.04e-07 5.94e-08 1.66e-07 1.76e-07 erg/cm2
Peak flux Cutoff-PL 7.81e-02 9.69e-02 8.59e-02 1.22e-01 3.06e-01 3.83e-01 ph/cm2/s
Error 8.19e-02 7.56e-02 5.43e-02 1.79e-01 1.44e-01 2.19e-01 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 2.802 0.370 - - 2.05e-04 6.31e-05 79.120 57
CPL 0.848 1.774 18.1 12.6 4.49e-03 1.10e-01 75.950 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.177 0.950 - - 2.62e-03 1.15e-03 82.520 57
CPL 2.114 0.000 41.4 0.0 8.45e-04 1.08e-03 82.350 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 423.176 -9.456 413.720
T90 376.524 2.060 378.584
T50 171.208 54.672 225.880
Peak 1.000 349.524 350.524
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.1367 -47.9144 0.0915 13.3 37.0 6.6708 2.1 TRIG_00848584
------------------------------------------
Foreground time interval of the image:
-9.456 278.410 (delta_t = 287.866 [sec])
280.000 413.720 (delta_t = 133.720 [sec])
Background time interval of the image:
-12.199 -9.456 (delta_t = 2.743 [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
Multiple GTIs in the spectrum
tstart tstop
-9.456000 278.410000
280.000000 413.720000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.80236 ( -0.343329 0.396213 )
Norm@50keV : 2.05184E-04 ( -6.16141e-05 6.44888e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.12 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.792566e-02
Photon flux (15-150 keV) in 421.6 sec: 4.90667E-02 ( -0.00734983 0.00735955 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.55717e-07 ( -1.82047e-07 1.94729e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-9.456000 278.410000
280.000000 413.720000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.848272 ( -2.40553 1.14265 )
Epeak [keV] : 18.1412 ( -16.831 8.40551 )
Norm@50keV : 4.48996E-03 ( -0.00448469 0.214768 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.95 using 59 PHA bins.
# Reduced chi-squared = 1.356 for 56 degrees of freedom
# Null hypothesis probability = 3.921762e-02
Photon flux (15-150 keV) in 421.6 sec: 4.77296E-02 ( -0.0071449 0.0070998 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.44714e-07 ( -1.49917e-07 1.81794e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-9.456000 278.410000
280.000000 413.720000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.907735 ( 1.16962 1.16962 )
beta : -9.56369 ( 9.56369 19.5635 )
Epeak [keV] : 17.7348 ( -10.3756 5.52538 )
Norm@50keV : 4.09398E-03 ( -0.000599762 0.00771549 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.95 using 59 PHA bins.
# Reduced chi-squared = 1.381 for 55 degrees of freedom
# Null hypothesis probability = 3.212586e-02
Photon flux (15-150 keV) in 421.6 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] : 6.28045 (-0.970032 1.07829)
R^2/D10^2 : 0.149109 (-0.0736927 0.161192)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.94 using 59 PHA bins.
# Reduced chi-squared = 1.385 for 57 degrees of freedom
# Null hypothesis probability = 2.880661e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.508e-07 8.160e-08
25- 50 3.858e-07 1.178e-07
50-150 4.245e-08 2.443e-08
15-150 7.791e-07 1.712e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.9514 (-5.96893 8.83278)
Norm : 0.538429 (-0.162573 0.257984)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.14 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 57 degrees of freedom
# Null hypothesis probability = 4.603206e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.794e-07 7.494e-08
25- 50 3.561e-07 9.469e-08
50-150 1.242e-07 7.569e-08
15-150 8.596e-07 1.977e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.74441 (-1.8858 5.86283)
R1^2/D10^2 : 3.45232 (-3.79449 4368.72)
kT2 [keV] : 7.81857 (-1.71455 4.39419)
R2^2/D10^2 : 4.72657E-02 (-0.04532 0.11506)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.91 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 55 degrees of freedom
# Null hypothesis probability = 3.834768e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.696e-07 1.825e-07
25- 50 3.801e-07 2.226e-07
50-150 8.856e-08 6.065e-08
15-150 8.382e-07 4.231e-07
Peak spectrum fit
Power-law model
Time interval is from 349.524 sec. to 350.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17667 ( -0.961266 0.939411 )
Norm@50keV : 2.61954E-03 ( -0.00115702 0.00113825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.52 using 59 PHA bins.
# Reduced chi-squared = 1.448 for 57 degrees of freedom
# Null hypothesis probability = 1.517764e-02
Photon flux (15-150 keV) in 1 sec: 0.306509 ( -0.13822 0.141155 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67548e-08 ( -1.26593e-08 1.30953e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 349.524 sec. to 350.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11351 ( -0.888741 -0.888741 )
Epeak [keV] : 41.4357 ( -9990.44 -9990.44 )
Norm@50keV : 8.44858E-04 ( -0.000835092 0.00133472 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.35 using 59 PHA bins.
# Reduced chi-squared = 1.471 for 56 degrees of freedom
# Null hypothesis probability = 1.249818e-02
Photon flux (15-150 keV) in 1 sec: 0.305521 ( -0.145694 0.141766 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67059e-08 ( -1.30561e-08 1.31053e-08 ) ergs/cm2
Band function
Time interval is from 349.524 sec. to 350.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17139 ( -1.16809 5.55781 )
beta : -9.37113 ( 9.37113 9.37113 )
Epeak [keV] : 9802.27 ( -9450.65 -9494.67 )
Norm@50keV : 2.63242E-03 ( -0.00114217 427800 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.52 using 59 PHA bins.
# Reduced chi-squared = 1.500 for 55 degrees of freedom
# Null hypothesis probability = 9.562701e-03
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] : 22.9227 (-10.0453 25.119)
R^2/D10^2 : 9.12604E-03 (-0.00912606 0.0490038)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.13 using 59 PHA bins.
# Reduced chi-squared = 1.458 for 57 degrees of freedom
# Null hypothesis probability = 1.355477e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.705e-10 5.775e-10
25- 50 4.714e-09 2.951e-09
50-150 1.850e-08 1.240e-08
15-150 2.409e-08 1.550e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-199.363 -199.363)
Norm : 1.27795 (-0.567716 0.567696)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.19 using 59 PHA bins.
# Reduced chi-squared = 1.459 for 57 degrees of freedom
# Null hypothesis probability = 1.340821e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.182e-09 2.097e-09
25- 50 6.121e-09 4.136e-09
50-150 1.342e-08 8.930e-09
15-150 2.273e-08 1.501e-08
Double BB
#Fit statistic : Chi-Squared = 77.30 using 59 PHA bins.
# Reduced chi-squared = 1.416 for 55 degrees of freedom
# Reduced chi-squared = 1.416 for 55 degrees of freedom
# Reduced chi-squared = 1.415 for 55 degrees of freedom
# Reduced chi-squared = 1.415 for 55 degrees of freedom
# Reduced chi-squared = 1.407 for 55 degrees of freedom
# Reduced chi-squared = 1.406 for 55 degrees of freedom
# Null hypothesis probability = 2.282510e-02
# Null hypothesis probability = 2.292362e-02
# Null hypothesis probability = 2.301096e-02
# Null hypothesis probability = 2.311756e-02
# Null hypothesis probability = 2.489407e-02
# Null hypothesis probability = 2.534381e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.954e-09 6.920e-10
25- 50 4.220e-09 2.812e-09
50-150 1.918e-08 1.238e-08
15-150 2.536e-08 1.579e-08
Plot creation:
Thu Jul 19 16:19:18 EDT 2018