batgrbproduct Analysis for Trigger=673978
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 17 17:27:29 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger673978/GCN5_download_cron
======================================================================
Trigger: 00673978 Segment: 000
BAT Trigger Time: 477342647.296 [s; MET]
Trigger Stop: 477342648.32 [s; MET]
UTC: 2016-02-16T19:10:31.443760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 311.705819095242 Dec: -71.5551525128288 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 20.11
Image Trigger?: NO
Rate S/N Ratio: 74.1822081094921 [ if not an image trigger ]
Image S/N Ratio: 20.11
Flight Position: [ source = BAT ]
RA: 311.705819095242 Dec: -71.5551525128288 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 311.679179433766 Dec: -71.5502839473414 [deg; J2000]
{ 20h 46m 43.0s , -71d 33' 01.0" }
+/- 0.909807626011147 [arcmin] (estimated 90% radius based on SNR)
+/- 0.298470491925989 [arcmin] (formal 1-sigma fit error)
SNR: 34.8146350891311
Angular difference between Flight and Ground position is 0.584074 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 11 +/- 1
Measured from: -0.295999884605408
to: 10.7040001153946 [s; relative to TRIGTIME]
T50: 2 +/- 1
Measured from: 0.704000115394592
to: 2.70400011539459 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.703999996185303
to: 1.7039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.296000003814697
to: 11.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.648034 1.181179 0.869312 0.337326
0.045725 0.044533 0.039344 0.029668 [error]
Peak 0.172185 0.306873 0.283996 0.088923
0.015394 0.016724 0.016173 0.011504 [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 2.69e-07 5.02e-07 7.21e-07 2.20e-06 2.05e-06 3.69e-06 erg/cm2
Error 2.29e-08 2.53e-08 3.88e-08 2.63e-07 9.61e-08 2.85e-07 erg/cm2
Peak flux Power-law 2.08e+00 2.36e+00 1.91e+00 2.58e+00 7.30e+00 8.94e+00 ph/cm2/s
Error 2.36e-01 1.63e-01 1.30e-01 3.68e-01 4.50e-01 5.37e-01 ph/cm2/s
Fluence Cutoff-PL 2.59e-07 5.10e-07 7.34e-07 1.70e-06 2.03e-06 3.21e-06 erg/cm2
Error 2.09e-08 2.85e-08 4.37e-08 5.87e-07 1.03e-07 6.19e-07 erg/cm2
Peak flux Cutoff-PL 1.99e+00 2.40e+00 1.96e+00 2.06e+00 7.24e+00 8.40e+00 ph/cm2/s
Error 2.88e-01 1.79e-01 1.53e-01 7.13e-01 4.59e-01 8.87e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 1.476 0.079 - - 1.80e-02 7.96e-04 53.400 57
CPL 1.293 0.271 207.5 0.0 2.19e-02 0.00e+00 52.310 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.303 0.102 - - 6.12e-02 3.59e-03 59.370 57
CPL 1.088 0.336 232.5 0.0 7.72e-02 2.98e-02 58.420 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: 10.624000 sec.
T50 in the 50-300 keV band: 2.624000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.000 -0.296 11.704
T90 11.000 -0.296 10.704
T50 2.000 0.704 2.704
Peak 1.000 0.704 1.704
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
311.6792 -71.5503 0.0055 41.2 -24.8 3.1202 34.8 TRIG_00673978
------------------------------------------
Foreground time interval of the image:
-0.296 11.704 (delta_t = 12.000 [sec])
Background time interval of the image:
-183.995 -0.296 (delta_t = 183.699 [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 -0.296 sec. to 11.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47605 ( -0.0790605 0.0789141 )
Norm@50keV : 1.79578E-02 ( -0.000795995 0.000795928 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.40 using 59 PHA bins.
# Reduced chi-squared = 0.9369 for 57 degrees of freedom
# Null hypothesis probability = 6.107814e-01
Photon flux (15-150 keV) in 12 sec: 2.22772 ( -0.107221 0.107538 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05254e-06 ( -9.5982e-08 9.61523e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 11.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29336 ( -0.315924 0.226634 )
Epeak [keV] : 207.537 ( )
Norm@50keV : 2.19364E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.31 using 59 PHA bins.
# Reduced chi-squared = 0.9341 for 56 degrees of freedom
# Null hypothesis probability = 6.154208e-01
Photon flux (15-150 keV) in 12 sec: 2.20567 ( -0.1125 0.11282 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03191e-06 ( -1.03164e-07 1.0242e-07 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 11.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.426554 ( -1.06639 3.7128 )
beta : -1.61444 ( -0.158487 0.125167 )
Epeak [keV] : 43.5137 ( -19.3634 41.7281 )
Norm@50keV : 0.273852 ( -0.273171 43.5491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.36 using 59 PHA bins.
# Reduced chi-squared = 0.8430 for 55 degrees of freedom
# Null hypothesis probability = 7.899916e-01
Photon flux (15-150 keV) in 12 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] : 16.0169 ( )
R^2/D10^2 : 0.198123 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 170.70 using 59 PHA bins.
# Reduced chi-squared = 2.9948 for 57 degrees of freedom
# Null hypothesis probability = 2.802338e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.261e-07 1.119e-08
25- 50 5.310e-07 3.138e-08
50-150 9.526e-07 7.758e-08
15-150 1.610e-06 8.820e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-17.3492 -200)
Norm : 9.21538 (-0.408753 0.408753)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.75 using 59 PHA bins.
# Reduced chi-squared = 0.9957 for 57 degrees of freedom
# Null hypothesis probability = 4.843202e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.754e-07 1.398e-08
25- 50 5.297e-07 2.802e-08
50-150 1.162e-06 5.448e-08
15-150 1.967e-06 1.002e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.21138 (-1.01359 1.07191)
R1^2/D10^2 : 1.01073 (-0.297066 0.456241)
kT2 [keV] : 40.0179 (-8.03907 15.2021)
R2^2/D10^2 : 6.69083E-03 (-0.00397928 0.00707732)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.86 using 59 PHA bins.
# Reduced chi-squared = 0.7611 for 55 degrees of freedom
# Null hypothesis probability = 9.039507e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.193e-07 2.808e-08
25- 50 5.597e-07 5.928e-08
50-150 1.265e-06 3.790e-07
15-150 2.044e-06 4.855e-07
Peak spectrum fit
Power-law model
Time interval is from 0.704 sec. to 1.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30329 ( -0.101737 0.101386 )
Norm@50keV : 6.11530E-02 ( -0.00359443 0.00359443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.37 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.894207e-01
Photon flux (15-150 keV) in 1 sec: 7.30015 ( -0.450024 0.450814 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.0382e-07 ( -3.84299e-08 3.85336e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.704 sec. to 1.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08798 ( -0.406089 0.265051 )
Epeak [keV] : 232.456 ( -232.456 -232.456 )
Norm@50keV : 7.72031E-02 ( -0.0186709 0.0410027 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.42 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 56 degrees of freedom
# Null hypothesis probability = 3.866116e-01
Photon flux (15-150 keV) in 1 sec: 7.23623 ( -0.4553 0.46331 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.98041e-07 ( -4.0412e-08 4.0076e-08 ) ergs/cm2
Band function
Time interval is from 0.704 sec. to 1.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.50070 ( -10.7712 -3.50279 )
beta : -1.39615 ( -0.147685 0.129808 )
Epeak [keV] : 30.3219 ( -6.58563 96.0976 )
Norm@50keV : 172.910 ( -175.49 733.845 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.28 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 55 degrees of freedom
# Null hypothesis probability = 4.642322e-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] : 18.0137 ( )
R^2/D10^2 : 0.461923 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 123.91 using 59 PHA bins.
# Reduced chi-squared = 2.1739 for 57 degrees of freedom
# Null hypothesis probability = 7.279765e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.000e-08 3.720e-09
25- 50 1.388e-07 1.255e-08
50-150 3.271e-07 3.340e-08
15-150 4.959e-07 3.755e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.408 -200)
Norm : 30.5537 (-1.81611 1.81611)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.46 using 59 PHA bins.
# Reduced chi-squared = 1.341 for 57 degrees of freedom
# Null hypothesis probability = 4.365248e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.610e-08 5.395e-09
25- 50 1.464e-07 1.080e-08
50-150 3.211e-07 6.325e-08
15-150 5.436e-07 4.140e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.62425 (-1.42006 1.63776)
R1^2/D10^2 : 3.57843 (-1.47154 2.7672)
kT2 [keV] : 35.3072 (-6.93074 13.5965)
R2^2/D10^2 : 3.93741E-02 (-0.0246367 0.0426706)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.13 using 59 PHA bins.
# Reduced chi-squared = 0.9842 for 55 degrees of freedom
# Null hypothesis probability = 5.077484e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.752e-08 1.360e-08
25- 50 1.458e-07 2.559e-08
50-150 4.013e-07 1.435e-07
15-150 6.047e-07 1.567e-07
Plot creation:
Wed Feb 17 17:35:35 EST 2016