batgrbproduct Analysis for Trigger=671828
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): Thu Jan 28 05:36:45 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger671828/GCN5_download_cron
======================================================================
Trigger: 00671828 Segment: 000
BAT Trigger Time: 475577003.072 [s; MET]
Trigger Stop: 475577004.096 [s; MET]
UTC: 2016-01-27T08:43:07.315740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 225.956116498615 Dec: 0.0890830115484875 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.7
Image Trigger?: NO
Rate S/N Ratio: 11.13552872566 [ if not an image trigger ]
Image S/N Ratio: 7.7
Flight Position: [ source = BAT ]
RA: 225.956116498615 Dec: 0.0890830115484875 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 225.965712204385 Dec: 0.0796502615178855 [deg; J2000]
{ 15h 03m 51.8s , +00d 04' 46.7" }
+/- 1.79451549337549 [arcmin] (estimated 90% radius based on SNR)
+/- 0.70469788736015 [arcmin] (formal 1-sigma fit error)
SNR: 13.1927899600768
Angular difference between Flight and Ground position is 0.807338 arcmin
Partial Coding Fraction: 0.4179688 [ including projection effects ]
Duration
T90: 6.15599989891052 +/- 0.936657860780595
Measured from: -0.707999885082245
to: 5.44800001382828 [s; relative to TRIGTIME]
T50: 3.57199996709824 +/- 0.672059531867363
Measured from: 0.74400007724762
to: 4.31600004434586 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.34399998188019
to: 4.34399998188019 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.43600004911423
to: 5.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.357093 0.306304 0.091156 0.000752
0.030977 0.030672 0.025385 0.021638 [error]
Peak 0.081048 0.060069 0.038377 0.005434
0.012629 0.012282 0.010053 0.007853 [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 1.14e-07 1.20e-07 8.89e-08 1.06e-07 3.64e-07 4.30e-07 erg/cm2
Error 1.63e-08 1.51e-08 2.14e-08 4.77e-08 5.11e-08 7.88e-08 erg/cm2
Peak flux Power-law 7.28e-01 4.71e-01 1.97e-01 1.13e-01 1.45e+00 1.51e+00 ph/cm2/s
Error 1.90e-01 1.02e-01 7.17e-02 7.34e-02 3.04e-01 3.19e-01 ph/cm2/s
Fluence Cutoff-PL 1.07e-07 1.40e-07 7.17e-08 1.16e-08 3.28e-07 3.30e-07 erg/cm2
Error 1.81e-08 2.09e-08 2.75e-08 2.57e-08 5.00e-08 5.59e-08 erg/cm2
Peak flux Cutoff-PL 6.35e-01 5.87e-01 1.96e-01 1.92e-02 1.43e+00 1.44e+00 ph/cm2/s
Error 2.20e-01 1.41e-01 9.11e-02 4.26e-02 3.00e-01 3.03e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 6.36e-01 5.86e-01 1.96e-01 1.95e-02 1.44e+00 1.44e+00 ph/cm2/s
Error 2.16e-01 1.40e-01 8.91e-02 -------- 3.00e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.432 0.233 - - 5.19e-03 9.25e-04 50.230 57
CPL 0.986 1.114 25.6 0.0 4.16e-02 0.00e+00 44.150 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.255 0.367 - - 8.52e-03 2.43e-03 64.410 57
CPL 0.498 1.692 35.0 0.0 9.26e-02 0.00e+00 59.960 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 7.140 -1.436 5.704
T90 6.156 -0.708 5.448
T50 3.572 0.744 4.316
Peak 1.000 3.344 4.344
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
225.9657 +0.0797 0.0146 32.2 -109.8 0.7811 13.2 TRIG_00671828
------------------------------------------
Foreground time interval of the image:
-1.436 5.704 (delta_t = 7.140 [sec])
Background time interval of the image:
-239.072 -1.436 (delta_t = 237.636 [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 -1.436 sec. to 5.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43237 ( -0.223279 0.243444 )
Norm@50keV : 5.18782E-03 ( -0.00092941 0.000920905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.23 using 59 PHA bins.
# Reduced chi-squared = 0.8812 for 57 degrees of freedom
# Null hypothesis probability = 7.251495e-01
Photon flux (15-150 keV) in 7.14 sec: 0.978372 ( -0.112153 0.112153 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64066e-07 ( -5.03073e-08 5.18846e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.436 sec. to 5.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.986193 ( -1.32941 0.897832 )
Epeak [keV] : 25.5988 ( )
Norm@50keV : 4.15851E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.15 using 59 PHA bins.
# Reduced chi-squared = 0.7883 for 56 degrees of freedom
# Null hypothesis probability = 8.741995e-01
Photon flux (15-150 keV) in 7.14 sec: 0.947008 ( -0.112556 0.112982 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28326e-07 ( -4.73739e-08 5.27132e-08 ) ergs/cm2
Band function
Time interval is from -1.436 sec. to 5.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.984470 ( -1.08653 1.39631 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 25.5992 ( -9.10034 7.79463 )
Norm@50keV : 4.17007E-02 ( -0.041696 0.252866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.15 using 59 PHA bins.
# Reduced chi-squared = 0.8026 for 55 degrees of freedom
# Null hypothesis probability = 8.525430e-01
Photon flux (15-150 keV) in 7.14 sec: 0.914942 ( 6.08506 -0.914942 ) 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] : 7.94083 (-0.98305 1.08082)
R^2/D10^2 : 1.11437 (-0.451707 0.797935)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.58 using 59 PHA bins.
# Reduced chi-squared = 0.9224 for 57 degrees of freedom
# Null hypothesis probability = 6.415697e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.022e-08 1.789e-08
25- 50 1.559e-07 2.592e-08
50-150 3.994e-08 1.459e-08
15-150 2.860e-07 4.345e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.8950 (-8.10853 11.4447)
Norm : 7.03634 (-1.44528 1.90995)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.43 using 59 PHA bins.
# Reduced chi-squared = 0.7795 for 57 degrees of freedom
# Null hypothesis probability = 8.874564e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.096e-07 1.589e-08
25- 50 1.355e-07 1.928e-08
50-150 8.965e-08 3.401e-08
15-150 3.347e-07 5.351e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.89459 (-1.44031 1.95208)
R1^2/D10^2 : 12.0672 (-9.49699 102.521)
kT2 [keV] : 10.9513 (-2.292 4.42372)
R2^2/D10^2 : 0.227687 (-0.187124 0.464312)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.01 using 59 PHA bins.
# Reduced chi-squared = 0.7820 for 55 degrees of freedom
# Null hypothesis probability = 8.798291e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.094e-07 5.823e-08
25- 50 1.374e-07 7.251e-08
50-150 7.750e-08 4.484e-08
15-150 3.244e-07 1.643e-07
Peak spectrum fit
Power-law model
Time interval is from 3.344 sec. to 4.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.25480 ( -0.340577 0.392624 )
Norm@50keV : 8.52378E-03 ( -0.00246069 0.00240395 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.41 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.333737e-01
Photon flux (15-150 keV) in 1 sec: 1.45307 ( -0.304455 0.304455 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.08065e-08 ( -1.9714e-08 2.04683e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.344 sec. to 4.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.498267 ( -1.93008 1.45462 )
Epeak [keV] : 35.0172 ( )
Norm@50keV : 9.25736E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.342855e-01
Photon flux (15-150 keV) in 1 sec: 1.43446 ( -0.2979 0.30268 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62453e-08 ( -1.81509e-08 1.95074e-08 ) ergs/cm2
Band function
Time interval is from 3.344 sec. to 4.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.513156 ( -1.00639 2.14304 )
beta : -10.0000 ( 10 1.06581e-14 )
Epeak [keV] : 35.0273 ( -21.7996 12.7622 )
Norm@50keV : 9.05562E-02 ( -0.0905562 1.14579 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.96 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 3.007229e-01
Photon flux (15-150 keV) in 1 sec: 1.43570 ( 5.5643 -0.30072 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.60129e-08 ( -7.60059e-08 -1.80213e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.89057 (-2.21634 2.37546)
R^2/D10^2 : 0.747533 (-0.425999 1.23021)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.99 using 59 PHA bins.
# Reduced chi-squared = 1.105 for 57 degrees of freedom
# Null hypothesis probability = 2.727067e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.484e-08 6.543e-09
25- 50 3.631e-08 1.397e-08
50-150 1.836e-08 9.473e-09
15-150 6.951e-08 2.594e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.2376 (-16.5183 30.3837)
Norm : 9.04981 (-2.61825 3.85233)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.77 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 57 degrees of freedom
# Null hypothesis probability = 3.417631e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.158e-08 6.755e-09
25- 50 2.986e-08 8.050e-09
50-150 2.629e-08 1.529e-08
15-150 7.772e-08 3.059e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.10043 (-1.63862 2.65099)
R1^2/D10^2 : 13.2395 (-11.8195 138.442)
kT2 [keV] : 12.7366 (-3.12958 4.71361)
R2^2/D10^2 : 0.220675 (-0.172667 0.436205)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.06 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 3.631310e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.115e-08 1.209e-08
25- 50 3.082e-08 1.641e-08
50-150 2.598e-08 1.637e-08
15-150 7.796e-08 4.196e-08
Plot creation:
Thu Jan 28 05:41:54 EST 2016