batgrbproduct analysis for trigger=828672
batgrbproduct Analysis for Trigger=828672
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 26 07:08:48 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger828672/GCN5_download_cron
======================================================================
Trigger: 00828672 Segment: 000
BAT Trigger Time: 546331602.624 [s; MET]
Trigger Stop: 546331603.648 [s; MET]
UTC: 2018-04-25T06:46:21.783300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 64.4693420741548 Dec: -32.9558700086783 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: NO
Rate S/N Ratio: 11.916375287813 [ if not an image trigger ]
Image S/N Ratio: 7.04
Flight Position: [ source = BAT ]
RA: 64.4693420741548 Dec: -32.9558700086783 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 64.4483264682538 Dec: -32.9513840411841 [deg; J2000]
{ 04h 17m 47.6s , -32d 57' 05.0" }
+/- 1.42082450865153 [arcmin] (estimated 90% radius based on SNR)
+/- 0.60795078179264 [arcmin] (formal 1-sigma fit error)
SNR: 18.4163460042098
Angular difference between Flight and Ground position is 1.091764 arcmin
Partial Coding Fraction: 0.2734375 [ including projection effects ]
Duration
T90: 11.9039998054504 +/- 2.71227132798173
Measured from: -0.135999798774719
to: 11.7680000066757 [s; relative to TRIGTIME]
T50: 4.54399991035461 +/- 1.2959012195006
Measured from: 1.59200012683868
to: 6.1360000371933 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.18800008296967
to: 2.18800008296967 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.967999935150146
to: 12.7280000448227 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.355796 0.640681 0.557618 0.069771
0.043941 0.047355 0.042951 0.035347 [error]
Peak 0.056193 0.061134 0.106359 0.032330
0.012802 0.013906 0.013497 0.010636 [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 1.30e-07 2.66e-07 4.25e-07 1.52e-06 1.18e-06 2.34e-06 erg/cm2
Error 1.88e-08 2.36e-08 4.14e-08 3.19e-07 1.04e-07 3.48e-07 erg/cm2
Peak flux Power-law 3.86e-01 5.69e-01 6.26e-01 1.29e+00 1.97e+00 2.87e+00 ph/cm2/s
Error 1.41e-01 1.28e-01 1.01e-01 4.55e-01 3.34e-01 4.96e-01 ph/cm2/s
Fluence Cutoff-PL 1.21e-07 2.78e-07 4.39e-07 8.36e-07 1.15e-06 1.67e-06 erg/cm2
Error 2.14e-08 2.84e-08 4.61e-08 5.59e-07 1.13e-07 6.17e-07 erg/cm2
Peak flux Cutoff-PL 3.09e-01 5.73e-01 6.80e-01 7.56e-01 1.92e+00 2.32e+00 ph/cm2/s
Error 1.85e-01 1.42e-01 1.07e-01 5.73e-01 3.52e-01 7.55e-01 ph/cm2/s
Fluence Band 1.11e-07 2.80e-07 3.69e-07 9.85e-07 1.03e-06 1.75e-06 erg/cm2
Error 2.22e-08 3.14e-08 4.23e-08 -------- 1.01e-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 1.322 0.135 - - 8.76e-03 7.04e-04 50.300 57
CPL 0.914 0.510 136.2 -42.0 1.40e-02 8.84e-03 48.330 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.863 0.284 - - 1.72e-02 2.94e-03 70.540 57
CPL 0.203 1.302 168.5 0.0 3.17e-02 5.82e-02 69.660 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: 3.456000 sec.
T50 in the 50-300 keV band: 1.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 13.696 -0.968 12.728
T90 11.904 -0.136 11.768
T50 4.544 1.592 6.136
Peak 1.000 1.188 2.188
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
64.4483 -32.9514 0.0104 36.6 -62.3 1.6058 18.4 TRIG_00828672
------------------------------------------
Foreground time interval of the image:
-0.968 11.277 (delta_t = 12.245 [sec])
Background time interval of the image:
-239.624 -0.968 (delta_t = 238.656 [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 -0.968 sec. to 12.728 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32211 ( -0.13546 0.13409 )
Norm@50keV : 8.75793E-03 ( -0.000704023 0.000703794 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.30 using 59 PHA bins.
# Reduced chi-squared = 0.8825 for 57 degrees of freedom
# Null hypothesis probability = 7.225386e-01
Photon flux (15-150 keV) in 13.7 sec: 1.04922 ( -0.0869899 0.0871248 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17939e-06 ( -1.03628e-07 1.04185e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.968 sec. to 12.728 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.914388 ( -0.557522 0.462297 )
Epeak [keV] : 136.164 ( -52.2165 -136.164 )
Norm@50keV : 1.40135E-02 ( -0.00558249 0.0121059 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.33 using 59 PHA bins.
# Reduced chi-squared = 0.8631 for 56 degrees of freedom
# Null hypothesis probability = 7.569268e-01
Photon flux (15-150 keV) in 13.7 sec: 1.03434 ( -0.08893 0.08896 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14727e-06 ( -1.13362e-07 1.12233e-07 ) ergs/cm2
Band function
Time interval is from -0.968 sec. to 12.728 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97725 ( -3.5971 -4.97725 )
beta : -1.53799 ( -0.212737 0.174764 )
Epeak [keV] : 30.0290 ( -4.43691 3.97829 )
Norm@50keV : 271.990 ( -21.536 461.029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.09 using 59 PHA bins.
# Reduced chi-squared = 0.7107 for 55 degrees of freedom
# Null hypothesis probability = 9.483450e-01
Photon flux (15-150 keV) in 13.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02994e-06 ( -1.02985e-06 -9.98209e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.7209 (-1.81634 2.07643)
R^2/D10^2 : 8.48905E-02 (-0.0280281 0.0413742)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.19 using 59 PHA bins.
# Reduced chi-squared = 1.424 for 57 degrees of freedom
# Null hypothesis probability = 1.935214e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.652e-08 1.169e-08
25- 50 2.904e-07 3.274e-08
50-150 5.766e-07 8.747e-08
15-150 9.335e-07 1.019e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-25.7949 -200)
Norm : 4.37453 (-0.35345 0.35345)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.09 using 59 PHA bins.
# Reduced chi-squared = 0.9840 for 57 degrees of freedom
# Null hypothesis probability = 5.093262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.492e-07 1.438e-08
25- 50 2.870e-07 5.679e-08
50-150 6.295e-07 2.721e-07
15-150 1.066e-06 2.638e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.08461 (-1.49101 1.87434)
R1^2/D10^2 : 0.665170 (-0.316002 0.619188)
kT2 [keV] : 32.2457 (-7.40503 17.1719)
R2^2/D10^2 : 7.33874E-03 (-0.00532163 0.0106187)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.69 using 59 PHA bins.
# Reduced chi-squared = 0.7580 for 55 degrees of freedom
# Null hypothesis probability = 9.071979e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.242e-07 4.609e-08
25- 50 2.926e-07 8.456e-08
50-150 7.583e-07 3.552e-07
15-150 1.175e-06 4.448e-07
Peak spectrum fit
Power-law model
Time interval is from 1.188 sec. to 2.188 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.862860 ( -0.294671 0.273565 )
Norm@50keV : 1.72055E-02 ( -0.00296988 0.00290517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.54 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 57 degrees of freedom
# Null hypothesis probability = 1.072313e-01
Photon flux (15-150 keV) in 1 sec: 1.97481 ( -0.33313 0.335805 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95941e-07 ( -3.20762e-08 3.21908e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.188 sec. to 2.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.202797 ( -1.71533 0.887959 )
Epeak [keV] : 168.513 ( -167.509 -167.509 )
Norm@50keV : 3.17266E-02 ( -0.0173229 0.0990176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.66 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 56 degrees of freedom
# Null hypothesis probability = 1.037270e-01
Photon flux (15-150 keV) in 1 sec: 1.91914 ( -0.35314 0.35107 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92452e-07 ( -3.3749e-08 3.3263e-08 ) ergs/cm2
Band function
Time interval is from 1.188 sec. to 2.188 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.907850 ( -0.302526 0.308055 )
Epeak [keV] : 26.5548 ( -26.554 52.444 )
Norm@50keV : 740.123 ( -116.139 2.99355e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.83 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 55 degrees of freedom
# Null hypothesis probability = 8.593038e-02
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] : 25.5427 (-4.61394 6.52127)
R^2/D10^2 : 4.69829E-02 (-0.0234125 0.0406292)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.82 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 57 degrees of freedom
# Null hypothesis probability = 8.942969e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.264e-09 1.879e-09
25- 50 3.019e-08 8.055e-09
50-150 1.456e-07 4.029e-08
15-150 1.810e-07 4.590e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-35.3314 -200)
Norm : 8.18166 (-1.4004 1.4004)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.50 using 59 PHA bins.
# Reduced chi-squared = 1.535 for 57 degrees of freedom
# Null hypothesis probability = 5.802354e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.039e-08 1.184e-08
25- 50 3.922e-08 2.231e-08
50-150 8.602e-08 4.852e-08
15-150 1.456e-07 8.355e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.09508 (-3.60093 20.3399)
R1^2/D10^2 : 2.85857 (-3.00902 147.443)
kT2 [keV] : 28.6279 (-6.00237 -28.5252)
R2^2/D10^2 : 3.17152E-02 (-0.0158319 0.0384743)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.85 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 55 degrees of freedom
# Null hypothesis probability = 9.919090e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.168e-08 6.525e-09
25- 50 3.042e-08 1.441e-08
50-150 1.492e-07 6.394e-08
15-150 1.913e-07 8.364e-08
Plot creation:
Thu Apr 26 07:13:28 EDT 2018