batgrbproduct Analysis for Trigger=672525
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): Wed Feb 3 21:53:35 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger672525/GCN5_download_cron
======================================================================
Trigger: 00672525 Segment: 000
BAT Trigger Time: 476158406.4 [s; MET]
Trigger Stop: 476158422.784 [s; MET]
UTC: 2016-02-03T02:13:10.612140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 161.951792632841 Dec: -24.7621168677871 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.81
Image Trigger?: NO
Rate S/N Ratio: 14.1774468787578 [ if not an image trigger ]
Image S/N Ratio: 8.81
Flight Position: [ source = BAT ]
RA: 161.951792632841 Dec: -24.7621168677871 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 161.967410774445 Dec: -24.771636583435 [deg; J2000]
{ 10h 47m 52.2s , -24d 46' 17.9" }
+/- 1.6771638158786 [arcmin] (estimated 90% radius based on SNR)
+/- 0.783236155971686 [arcmin] (formal 1-sigma fit error)
SNR: 14.5310253304108
Angular difference between Flight and Ground position is 1.024828 arcmin
Partial Coding Fraction: 0.203125 [ including projection effects ]
Duration
T90: 20.160000026226 +/- 3.23612604894565
Measured from: 3.86400014162064
to: 24.0240001678467 [s; relative to TRIGTIME]
T50: 9.50400006771088 +/- 2.92480701662574
Measured from: 8.53600013256073
to: 18.0400002002716 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 11.9800000190735
to: 12.9800000190735 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.4640000462532
to: 25.7840000391006 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.724348 0.792881 0.459629 0.072033
0.075309 0.078588 0.064851 0.053872 [error]
Peak 0.060201 0.053488 0.030217 0.020686
0.015248 0.017868 0.014779 0.011595 [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 2.38e-07 3.37e-07 3.55e-07 6.90e-07 1.15e-06 1.62e-06 erg/cm2
Error 3.86e-08 3.71e-08 6.34e-08 2.47e-07 1.47e-07 3.12e-07 erg/cm2
Peak flux Power-law 5.75e-01 4.30e-01 2.15e-01 1.53e-01 1.29e+00 1.37e+00 ph/cm2/s
Error 2.41e-01 1.38e-01 1.19e-01 1.83e-01 4.06e-01 4.46e-01 ph/cm2/s
Fluence Cutoff-PL 2.24e-07 3.60e-07 3.55e-07 2.94e-07 1.10e-06 1.23e-06 erg/cm2
Error 4.41e-08 5.05e-08 6.95e-08 4.40e-07 1.64e-07 4.43e-07 erg/cm2
Peak flux Cutoff-PL 5.74e-01 4.30e-01 2.15e-01 1.52e-01 1.29e+00 1.37e+00 ph/cm2/s
Error 2.49e-01 1.78e-01 1.21e-01 1.82e-01 4.05e-01 4.54e-01 ph/cm2/s
Fluence Band 2.22e-07 3.59e-07 3.53e-07 3.60e-07 1.09e-06 1.29e-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 1.926 0.203 - - 5.13e-03 6.71e-04 42.960 57
CPL 1.385 0.847 50.3 0.0 1.03e-02 0.00e+00 41.690 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.003 0.632 - - 8.60e-03 3.69e-03 53.710 57
CPL 2.014 2.332 48.7 0.0 8.46e-03 0.00e+00 53.710 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: 17.536000 sec.
T50 in the 50-300 keV band: 8.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 24.320 1.464 25.784
T90 20.160 3.864 24.024
T50 9.504 8.536 18.040
Peak 1.000 11.980 12.980
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
161.9674 -24.7716 0.0132 34.8 110.2 2.1205 14.5 TRIG_00672525
------------------------------------------
Foreground time interval of the image:
1.464 25.784 (delta_t = 24.320 [sec])
Background time interval of the image:
-239.400 -144.680 (delta_t = 94.720 [sec])
-143.400 -30.260 (delta_t = 113.140 [sec])
-29.400 1.464 (delta_t = 30.864 [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 1.464 sec. to 25.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92618 ( -0.197452 0.207667 )
Norm@50keV : 5.12571E-03 ( -0.000678233 0.000662861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.96 using 59 PHA bins.
# Reduced chi-squared = 0.7536 for 57 degrees of freedom
# Null hypothesis probability = 9.159286e-01
Photon flux (15-150 keV) in 24.32 sec: 0.743906 ( -0.0826205 0.0826832 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14649e-06 ( -1.46119e-07 1.4839e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.464 sec. to 25.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38493 ( -0.982381 0.71113 )
Epeak [keV] : 50.2590 ( )
Norm@50keV : 1.02518E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.69 using 59 PHA bins.
# Reduced chi-squared = 0.7445 for 56 degrees of freedom
# Null hypothesis probability = 9.226741e-01
Photon flux (15-150 keV) in 24.32 sec: 0.728666 ( -0.085915 0.085667 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09562e-06 ( -1.61285e-07 1.66451e-07 ) ergs/cm2
Band function
Time interval is from 1.464 sec. to 25.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37582 ( 1.37586 2.99525 )
beta : -2.67884 ( 2.75778 12.3959 )
Epeak [keV] : 50.3520 ( -49.9214 -49.9214 )
Norm@50keV : 1.03360E-02 ( -0.00577316 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.69 using 59 PHA bins.
# Reduced chi-squared = 0.7579 for 55 degrees of freedom
# Null hypothesis probability = 9.073181e-01
Photon flux (15-150 keV) in 24.32 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09387e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8761 (-1.33627 1.54956)
R^2/D10^2 : 0.254494 (-0.101403 0.165019)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.40 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.601771e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.526e-07 3.261e-08
25- 50 4.253e-07 6.275e-08
50-150 2.817e-07 7.633e-08
15-150 8.595e-07 1.142e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.2218 (-22.9961 41.2788)
Norm : 3.51899 (-0.558281 0.695539)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.73 using 59 PHA bins.
# Reduced chi-squared = 0.7322 for 57 degrees of freedom
# Null hypothesis probability = 9.355138e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.217e-07 3.508e-08
25- 50 3.630e-07 4.511e-08
50-150 5.047e-07 2.275e-07
15-150 1.089e-06 2.237e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.89030 (-3.76653 2.8226)
R1^2/D10^2 : 1.61794 (-1.12559 236.917)
kT2 [keV] : 18.4644 (-16.3894 18.2136)
R2^2/D10^2 : 2.45589E-02 (-0.0224849 0.036475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.39 using 59 PHA bins.
# Reduced chi-squared = 0.7889 for 55 degrees of freedom
# Null hypothesis probability = 8.710133e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.170e-07 1.170e-07
25- 50 3.596e-07 1.881e-07
50-150 4.888e-07 2.735e-07
15-150 1.065e-06 5.512e-07
Peak spectrum fit
Power-law model
Time interval is from 11.980 sec. to 12.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00290 ( -0.560101 0.704811 )
Norm@50keV : 8.59718E-03 ( -0.00384627 0.00352652 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.71 using 59 PHA bins.
# Reduced chi-squared = 0.9423 for 57 degrees of freedom
# Null hypothesis probability = 5.991430e-01
Photon flux (15-150 keV) in 1 sec: 1.29130 ( -0.405655 0.405699 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.92942e-08 ( -3.09747e-08 3.27966e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 11.980 sec. to 12.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01429 ( -3.59713 1.06696 )
Epeak [keV] : 48.7231 ( )
Norm@50keV : 8.46317E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.71 using 59 PHA bins.
# Reduced chi-squared = 0.9592 for 56 degrees of freedom
# Null hypothesis probability = 5.619103e-01
Photon flux (15-150 keV) in 1 sec: 1.29097 ( -0.405097 0.40505 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.92781e-08 ( -3.43246e-08 3.26149e-08 ) ergs/cm2
Band function
Time interval is from 11.980 sec. to 12.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27014 ( 1.26326 1.26326 )
beta : -2.07316 ( 2.08014 0.631048 )
Epeak [keV] : 27.3001 ( -26.007 -26.007 )
Norm@50keV : 2.86647E-02 ( -0.0391889 2887.12 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.67 using 59 PHA bins.
# Reduced chi-squared = 0.9758 for 55 degrees of freedom
# Null hypothesis probability = 5.255913e-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] : 9.07771 (-3.34427 4.67939)
R^2/D10^2 : 0.888019 (-0.882373 4.18199)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.48 using 59 PHA bins.
# Reduced chi-squared = 0.9909 for 57 degrees of freedom
# Null hypothesis probability = 4.944906e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.431e-08 8.800e-09
25- 50 3.082e-08 1.873e-08
50-150 1.207e-08 9.710e-09
15-150 5.721e-08 3.691e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.3261 (-39.455 -64.3261)
Norm : 6.62657 (-2.64012 5.28051)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.91 using 59 PHA bins.
# Reduced chi-squared = 0.9458 for 57 degrees of freedom
# Null hypothesis probability = 5.917530e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.683e-08 1.053e-08
25- 50 2.615e-08 1.610e-08
50-150 3.148e-08 2.701e-08
15-150 7.446e-08 5.154e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.26545 (-5.31525 -5.31525)
R1^2/D10^2 : 5.14242 (-4.97774 -4.97774)
kT2 [keV] : 18.8338 (-19.5618 -19.5618)
R2^2/D10^2 : 3.59433E-02 (-0.0316181 1.16399)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9790 for 55 degrees of freedom
# Null hypothesis probability = 5.188726e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.783e-08 1.069e-08
25- 50 2.335e-08 1.244e-08
50-150 3.186e-08 2.349e-08
15-150 7.304e-08 4.065e-08
Plot creation:
Wed Feb 3 21:58:57 EST 2016