batgrbproduct Analysis for Trigger=675998
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Feb 26 11:44:35 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger675998/GCN5_download_cron
======================================================================
Trigger: 00675998 Segment: 000
BAT Trigger Time: 478102872.32 [s; MET]
Trigger Stop: 478102899.2 [s; MET]
UTC: 2016-02-25T14:20:56.426440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 164.2420743311 Dec: 53.6552363651881 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.62
Image Trigger?: NO
Rate S/N Ratio: 10.816653826392 [ if not an image trigger ]
Image S/N Ratio: 8.62
Flight Position: [ source = BAT ]
RA: 164.2420743311 Dec: 53.6552363651881 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 164.218136612338 Dec: 53.6585158410607 [deg; J2000]
{ 10h 56m 52.4s , +53d 39' 30.7" }
+/- 1.89095628560679 [arcmin] (estimated 90% radius based on SNR)
+/- 0.860151010392037 [arcmin] (formal 1-sigma fit error)
SNR: 12.2421898399133
Angular difference between Flight and Ground position is 0.873606 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 157.408000051975 +/- 70.4733803939028
Measured from: -23.7999998927116
to: 133.608000159264 [s; relative to TRIGTIME]
T50: 37.3600000143051 +/- 10.3551154537195
Measured from: 0.00800013542175293
to: 37.3680001497269 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 37.1320000290871
to: 38.1320000290871 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.3759999871254
to: 135.287999987602 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.754239 0.837243 0.721582 0.187116
0.113804 0.117253 0.100808 0.084509 [error]
Peak 0.040736 0.024587 0.046799 0.013976
0.009343 0.010040 0.008322 0.006640 [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 2.40e-07 4.20e-07 5.62e-07 1.54e-06 1.64e-06 2.77e-06 erg/cm2
Error 5.47e-08 5.91e-08 9.95e-08 5.84e-07 2.41e-07 6.61e-07 erg/cm2
Peak flux Power-law 3.06e-01 3.47e-01 2.82e-01 3.83e-01 1.08e+00 1.32e+00 ph/cm2/s
Error 1.46e-01 9.73e-02 6.84e-02 2.17e-01 2.56e-01 2.84e-01 ph/cm2/s
Fluence Cutoff-PL 2.31e-07 4.31e-07 5.73e-07 1.08e-06 1.61e-06 2.31e-06 erg/cm2
Error 6.42e-08 7.19e-08 1.09e-07 1.08e-06 3.24e-07 9.66e-07 erg/cm2
Peak flux Cutoff-PL 3.27e-01 3.56e-01 2.77e-01 3.54e-01 1.09e+00 1.32e+00 ph/cm2/s
Error 1.48e-01 9.85e-02 -------- -------- 2.59e-01 2.22e-01 ph/cm2/s
Fluence Band 2.14e-07 4.34e-07 5.68e-07 1.26e-06 1.59e-06 2.48e-06 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 1.579 0.234 - - 1.05e-03 1.45e-04 57.380 57
CPL 1.340 0.792 139.3 0.0 1.39e-03 2.48e-03 57.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.298 0.434 - - 9.02e-03 1.95e-03 47.490 57
CPL 1.320 0.479 9999.4 0.0 9.07e-03 5.82e-03 47.510 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: 67.776000 sec.
T50 in the 50-300 keV band: 38.656000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 165.664 -30.376 135.288
T90 157.408 -23.800 133.608
T50 37.360 0.008 37.368
Peak 1.000 37.132 38.132
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
164.2181 +53.6585 0.0157 41.6 20.0 2.9732 12.2 TRIG_00675998
------------------------------------------
Foreground time interval of the image:
-30.376 108.681 (delta_t = 139.057 [sec])
Background time interval of the image:
-239.320 -30.376 (delta_t = 208.944 [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 -30.376 sec. to 135.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57876 ( -0.232509 0.235614 )
Norm@50keV : 1.05299E-03 ( -0.000145087 0.000144009 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.38 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.609619e-01
Photon flux (15-150 keV) in 165.7 sec: 0.134439 ( -0.0186183 0.0186913 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.63614e-06 ( -2.39649e-07 2.41723e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.376 sec. to 135.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33970 ( -1.11857 0.465581 )
Epeak [keV] : 139.283 ( -139.297 -139.297 )
Norm@50keV : 1.39133E-03 ( -0.00139126 0.00357163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 56 degrees of freedom
# Null hypothesis probability = 4.304723e-01
Photon flux (15-150 keV) in 165.7 sec: 0.133117 ( -0.019414 0.019304 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61214e-06 ( -2.6253e-07 3.84744e-07 ) ergs/cm2
Band function
Time interval is from -30.376 sec. to 135.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04008 ( 1.04093 1.04093 )
beta : -1.84111 ( 1.82884 0.468314 )
Epeak [keV] : 82.1655 ( -85.2052 -85.2052 )
Norm@50keV : 2.03459E-03 ( -0.000932987 0.05927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.07 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.982325e-01
Photon flux (15-150 keV) in 165.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59356e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.6705 (-2.17781 2.65634)
R^2/D10^2 : 1.63058E-02 (-0.0073831 0.0128197)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.71 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.376029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.222e-07 3.140e-08
25- 50 4.754e-07 9.818e-08
50-150 6.894e-07 1.862e-07
15-150 1.287e-06 2.438e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 196.902 (-94.0356 -196.324)
Norm : 0.547229 (-0.0738539 0.0911681)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.21 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.671515e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.262e-07 1.278e-07
25- 50 4.344e-07 2.374e-07
50-150 9.488e-07 5.213e-07
15-150 1.609e-06 8.774e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.40195 (-1.97692 8.40977)
R1^2/D10^2 : 0.729677 (-0.701765 15.5567)
kT2 [keV] : 18.9706 (-3.996 -18.9676)
R2^2/D10^2 : 5.73719E-03 (-0.00573017 0.00832307)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.49 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.486159e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.389e-07 1.212e-07
25- 50 4.040e-07 1.726e-07
50-150 8.565e-07 3.607e-07
15-150 1.499e-06 5.420e-07
Peak spectrum fit
Power-law model
Time interval is from 37.132 sec. to 38.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29847 ( -0.444741 0.422685 )
Norm@50keV : 9.02025E-03 ( -0.0019574 0.00193998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.49 using 59 PHA bins.
# Reduced chi-squared = 0.8332 for 57 degrees of freedom
# Null hypothesis probability = 8.111775e-01
Photon flux (15-150 keV) in 1 sec: 1.07582 ( -0.255653 0.257087 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.91698e-08 ( -2.01013e-08 2.01495e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 37.132 sec. to 38.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32013 ( -0.555063 0.403356 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 9.06836E-03 ( -0.00193675 0.00970998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.51 using 59 PHA bins.
# Reduced chi-squared = 0.8485 for 56 degrees of freedom
# Null hypothesis probability = 7.830543e-01
Photon flux (15-150 keV) in 1 sec: 1.09169 ( -0.274756 0.24317 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.90115e-08 ( -1.95595e-08 1.94495e-08 ) ergs/cm2
Band function
Time interval is from 37.132 sec. to 38.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06021 ( 1.06018 1.06018 )
beta : -1.29819 ( -0.37849 0.444679 )
Epeak [keV] : 31.5929 ( -31.6525 -31.6525 )
Norm@50keV : 1.76997E-02 ( -0.0106043 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.49 using 59 PHA bins.
# Reduced chi-squared = 0.8635 for 55 degrees of freedom
# Null hypothesis probability = 7.539897e-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] : 23.9886 (-6.82982 11.9743)
R^2/D10^2 : 2.52608E-02 (-0.0177465 0.0509065)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.51 using 59 PHA bins.
# Reduced chi-squared = 0.9914 for 57 degrees of freedom
# Null hypothesis probability = 4.934012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.580e-09 1.353e-09
25- 50 1.432e-08 7.520e-09
50-150 6.141e-08 2.925e-08
15-150 7.832e-08 4.219e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-81.5148 -200)
Norm : 4.54376 (-0.991834 0.991834)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.99 using 59 PHA bins.
# Reduced chi-squared = 0.8769 for 57 degrees of freedom
# Null hypothesis probability = 7.333254e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.132e-08 6.955e-09
25- 50 2.178e-08 1.250e-08
50-150 4.777e-08 2.739e-08
15-150 8.087e-08 4.713e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.62306 (-1.38771 2.31839)
R1^2/D10^2 : 23.3893 (-21.2757 232.892)
kT2 [keV] : 31.8368 (-9.88334 24.5733)
R2^2/D10^2 : 9.74334E-03 (-0.00765022 0.0215827)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.61 using 59 PHA bins.
# Reduced chi-squared = 0.7928 for 55 degrees of freedom
# Null hypothesis probability = 8.658895e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.438e-08 8.162e-09
25- 50 1.288e-08 6.343e-09
50-150 6.563e-08 3.858e-08
15-150 9.289e-08 4.658e-08
Plot creation:
Fri Feb 26 11:53:39 EST 2016