batgrbproduct analysis for trigger=808625
batgrbproduct Analysis for Trigger=808625
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): Mon Feb 5 20:04:03 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger808625/batgroup_hand_proc
======================================================================
Trigger: 00808625 Segment: 000
BAT Trigger Time: 539497549.76 [s; MET]
Trigger Stop: 539497550.272 [s; MET]
UTC: 2018-02-05T04:25:29.331960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 126.806396594374 Dec: 11.5396155071366 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.76
Image Trigger?: NO
Rate S/N Ratio: 23.1516738055805 [ if not an image trigger ]
Image S/N Ratio: 10.76
Flight Position: [ source = BAT ]
RA: 126.806396594374 Dec: 11.5396155071366 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 126.818861495607 Dec: 11.5364276577778 [deg; J2000]
{ 08h 27m 16.5s , +11d 32' 11.1" }
+/- 1.09327842001865 [arcmin] (estimated 90% radius based on SNR)
+/- 0.51222263892537 [arcmin] (formal 1-sigma fit error)
SNR: 26.7786513156498
Angular difference between Flight and Ground position is 0.757332 arcmin
Partial Coding Fraction: 0.5 [ including projection effects ]
Duration
T90: 15.5359998941422 +/- 3.12326232779722
Measured from: -6.31599998474121
to: 9.21999990940094 [s; relative to TRIGTIME]
T50: 6.11199986934662 +/- 0.596161084846529
Measured from: -4.68799996376038
to: 1.42399990558624 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.195999979972839
to: 0.804000020027161 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.0440000295639
to: 10.8680000305176 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.754964 0.732618 0.396098 0.059213
0.038867 0.040050 0.033652 0.027988 [error]
Peak 0.123567 0.152525 0.108172 0.017880
0.011139 0.011644 0.010116 0.007478 [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 2.34e-07 3.10e-07 3.03e-07 5.28e-07 1.02e-06 1.37e-06 erg/cm2
Error 2.27e-08 1.96e-08 3.30e-08 1.17e-07 7.45e-08 1.49e-07 erg/cm2
Peak flux Power-law 1.29e+00 1.13e+00 6.86e-01 6.27e-01 3.37e+00 3.73e+00 ph/cm2/s
Error 1.70e-01 9.69e-02 8.02e-02 1.43e-01 2.87e-01 3.14e-01 ph/cm2/s
Fluence Cutoff-PL 2.28e-07 3.18e-07 3.02e-07 3.66e-07 1.00e-06 1.21e-06 erg/cm2
Error 2.60e-08 2.48e-08 3.43e-08 2.36e-07 8.64e-08 2.57e-07 erg/cm2
Peak flux Cutoff-PL 1.15e+00 1.21e+00 7.20e-01 3.13e-01 3.29e+00 3.40e+00 ph/cm2/s
Error 2.04e-01 1.20e-01 9.13e-02 1.97e-01 2.96e-01 3.56e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.16e+00 1.21e+00 7.21e-01 3.35e-01 3.30e+00 3.43e+00 ph/cm2/s
Error -------- -------- 9.04e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.036 0.126 - - 6.16e-03 4.80e-04 58.370 57
CPL 1.827 0.405 36.5 0.0 8.05e-03 0.00e+00 57.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.725 0.144 - - 2.52e-02 2.29e-03 68.720 57
CPL 1.054 0.613 68.4 57.0 5.62e-02 4.57e-02 64.620 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: 6.272000 sec.
T50 in the 50-300 keV band: 4.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 17.912 -7.044 10.868
T90 15.536 -6.316 9.220
T50 6.112 -4.688 1.424
Peak 1.000 -0.196 0.804
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
126.8189 +11.5364 0.0072 26.0 87.9 1.9917 26.8 TRIG_00808625
------------------------------------------
Foreground time interval of the image:
-7.044 10.868 (delta_t = 17.912 [sec])
Background time interval of the image:
-239.760 -117.710 (delta_t = 122.050 [sec])
-109.760 -7.044 (delta_t = 102.716 [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 -7.044 sec. to 10.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03640 ( -0.124093 0.128213 )
Norm@50keV : 6.16354E-03 ( -0.000483311 0.000475743 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.37 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.249344e-01
Photon flux (15-150 keV) in 17.91 sec: 0.940349 ( -0.0607564 0.0608381 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.02024e-06 ( -7.4125e-08 7.48944e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.044 sec. to 10.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82655 ( -0.508502 0.300671 )
Epeak [keV] : 36.5434 ( )
Norm@50keV : 8.04753E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.78 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 56 degrees of freedom
# Null hypothesis probability = 4.094733e-01
Photon flux (15-150 keV) in 17.91 sec: 0.929704 ( -0.06482 0.064827 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00012e-06 ( -8.60898e-08 8.67005e-08 ) ergs/cm2
Band function
Time interval is from -7.044 sec. to 10.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.82661 ( 1.8555 0.453631 )
beta : -10.0000 ( 10 4.9738e-14 )
Epeak [keV] : 36.5377 ( -17.8953 -36.5377 )
Norm@50keV : 8.04497E-03 ( -0.00199231 0.00716267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.78 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.731067e-01
Photon flux (15-150 keV) in 17.91 sec: 0.930529 ( ) 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] : 10.2238 ( )
R^2/D10^2 : 0.382391 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 120.39 using 59 PHA bins.
# Reduced chi-squared = 2.1121 for 57 degrees of freedom
# Null hypothesis probability = 1.959003e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.468e-07 1.621e-08
25- 50 3.766e-07 2.794e-08
50-150 2.095e-07 3.646e-08
15-150 7.329e-07 5.472e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.4882 (-12.4896 17.1492)
Norm : 4.60552 (-0.493417 0.570233)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.490695e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.107e-07 2.006e-08
25- 50 3.320e-07 2.194e-08
50-150 4.148e-07 6.260e-08
15-150 9.576e-07 7.065e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.45079 (-1.04089 1.12292)
R1^2/D10^2 : 3.14242 (-1.57183 4.28473)
kT2 [keV] : 19.3234 (-3.45695 5.30216)
R2^2/D10^2 : 2.46428E-02 (-0.0151202 0.0306011)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.151446e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.232e-07 5.514e-08
25- 50 3.101e-07 7.110e-08
50-150 4.406e-07 1.547e-07
15-150 9.739e-07 2.588e-07
Peak spectrum fit
Power-law model
Time interval is from -0.196 sec. to 0.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72498 ( -0.142251 0.146317 )
Norm@50keV : 2.51737E-02 ( -0.00230697 0.00228198 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.72 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 57 degrees of freedom
# Null hypothesis probability = 1.373702e-01
Photon flux (15-150 keV) in 1 sec: 3.37306 ( -0.286561 0.2868 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3265e-07 ( -2.20962e-08 2.22801e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.196 sec. to 0.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05376 ( -0.6533 0.572311 )
Epeak [keV] : 68.4223 ( -15.0176 98.9135 )
Norm@50keV : 5.62152E-02 ( -0.0273656 0.0640377 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.62 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 56 degrees of freedom
# Null hypothesis probability = 2.008359e-01
Photon flux (15-150 keV) in 1 sec: 3.28797 ( -0.29662 0.29581 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23343e-07 ( -2.3403e-08 2.3677e-08 ) ergs/cm2
Band function
Time interval is from -0.196 sec. to 0.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05358 ( -0.501705 0.736023 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 68.3960 ( -14.419 99.4791 )
Norm@50keV : 5.62273E-02 ( -0.0273741 0.0640499 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.62 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Null hypothesis probability = 1.757636e-01
Photon flux (15-150 keV) in 1 sec: 3.29852 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22857e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5837 (-1.34387 1.47358)
R^2/D10^2 : 0.530248 (-0.165083 0.241994)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.83 using 59 PHA bins.
# Reduced chi-squared = 1.611 for 57 degrees of freedom
# Null hypothesis probability = 2.361753e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.072e-08 3.180e-09
25- 50 7.473e-08 7.890e-09
50-150 8.936e-08 1.668e-08
15-150 1.848e-07 1.915e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 128.365 (-37.2375 57.8518)
Norm : 14.1064 (-1.40945 1.77749)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.22 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.126316e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.663e-08 4.145e-09
25- 50 6.627e-08 9.015e-09
50-150 1.222e-07 4.983e-08
15-150 2.251e-07 5.770e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.37488 (-1.21505 1.7221)
R1^2/D10^2 : 19.7106 (-14.5271 74.1986)
kT2 [keV] : 17.7120 (-2.36785 3.36481)
R2^2/D10^2 : 0.176131 (-0.0894195 0.132127)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.95 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 55 degrees of freedom
# Null hypothesis probability = 2.421985e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.834e-08 1.682e-08
25- 50 6.340e-08 1.587e-08
50-150 1.154e-07 2.565e-08
15-150 2.172e-07 5.015e-08
Plot creation:
Mon Feb 5 21:39:49 EST 2018