batgrbproduct Analysis for Trigger=661869
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 Oct 28 17:58:42 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger661869/GCN5_download_cron
======================================================================
Trigger: 00661869 Segment: 000
BAT Trigger Time: 467678456 [s; MET]
Trigger Stop: 467678576 [s; MET]
UTC: 2015-10-27T22:40:40.667480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 76.2377464873154 Dec: -6.42683741237344 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.49
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.49
Flight Position: [ source = BAT ]
RA: 76.2377464873154 Dec: -6.42683741237344 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 76.1876161412714 Dec: -6.42783525944579 [deg; J2000]
{ 05h 04m 45.0s , -06d 25' 40.2" }
+/- 2.44811324712067 [arcmin] (estimated 90% radius based on SNR)
+/- 1.37526973613355 [arcmin] (formal 1-sigma fit error)
SNR: 8.4653477428557
Angular difference between Flight and Ground position is 2.989515 arcmin
Partial Coding Fraction: 0.1738281 [ including projection effects ]
Duration
T90: 80 +/- 35.7770876399966
Measured from: 1.00000011920929
to: 81.0000001192093 [s; relative to TRIGTIME]
T50: 16 +/- 35.7770876399966
Measured from: 33.0000001192093
to: 49.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 40.5
to: 41.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1
to: 97 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.941628 0.775098 0.760926 0.024217
0.119923 0.125091 0.109890 0.098762 [error]
Peak 0.023353 0.013280 0.008817 -0.012975
0.012486 0.012550 0.011852 0.010575 [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 2.79e-07 4.20e-07 4.73e-07 1.01e-06 1.48e-06 2.18e-06 erg/cm2
Error 6.12e-08 6.06e-08 1.11e-07 4.85e-07 2.55e-07 5.93e-07 erg/cm2
Peak flux Power-law 1.19e-01 8.33e-02 3.84e-02 2.47e-02 2.53e-01 2.65e-01 ph/cm2/s
Error 1.62e-01 9.51e-02 6.31e-02 3.91e-01 2.86e-01 3.06e-01 ph/cm2/s
Fluence Cutoff-PL 2.75e-07 4.28e-07 4.77e-07 8.09e-07 1.46e-06 1.99e-06 erg/cm2
Error 5.10e-08 7.04e-08 1.15e-07 6.55e-07 2.67e-07 6.09e-07 erg/cm2
Peak flux Cutoff-PL 1.00e-01 1.08e-01 2.86e-02 1.08e-03 2.38e-01 2.38e-01 ph/cm2/s
Error 1.63e-01 1.47e-01 7.37e-02 -------- 2.82e-01 3.00e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.10e-01 9.49e-02 3.96e-02 8.89e-03 2.52e-01 2.54e-01 ph/cm2/s
Error -------- -------- -------- -------- 2.83e-01 3.03e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.829 0.273 - - 1.67e-03 2.85e-04 58.470 57
CPL 2.008 0.000 4.0 0.0 1.38e-03 0.00e+00 58.810 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.122 0.000 - - 1.59e-03 2.09e-03 46.020 57
CPL -10.000 0.000 40.7 0.0 6.97e+03 0.00e+00 45.860 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: 24.832000 sec.
T50 in the 50-300 keV band: 13.184000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 96.000 1.000 97.000
T90 80.000 1.000 81.000
T50 16.000 33.000 49.000
Peak 1.000 40.500 41.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
76.1876 -6.4278 0.0227 37.4 118.1 2.3411 8.5 TRIG_00661869
------------------------------------------
Foreground time interval of the image:
1.000 97.000 (delta_t = 96.000 [sec])
Background time interval of the image:
-239.000 -210.700 (delta_t = 28.300 [sec])
-210.000 1.000 (delta_t = 211.000 [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 1.000 sec. to 97.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82876 ( -0.264111 0.281818 )
Norm@50keV : 1.67273E-03 ( -0.000289674 0.000279869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.47 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 57 degrees of freedom
# Null hypothesis probability = 4.210714e-01
Photon flux (15-150 keV) in 96 sec: 0.233118 ( -0.0338813 0.0339068 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.47708e-06 ( -2.52738e-07 2.58024e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.000 sec. to 97.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00849 ( -2.00849 -2.00849 )
Epeak [keV] : 4.02629 ( )
Norm@50keV : 1.38283E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.81 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 56 degrees of freedom
# Null hypothesis probability = 3.731260e-01
Photon flux (15-150 keV) in 96 sec: 0.231861 ( -0.034706 0.034614 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4635e-06 ( -2.65498e-07 2.67734e-07 ) ergs/cm2
Band function
Time interval is from 1.000 sec. to 97.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.70686 ( -1.19783 0.87119 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 131.333 ( -107.796 -130.073 )
Norm@50keV : 1.91453E-03 ( -0.000509846 0.00419319 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.41 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 55 degrees of freedom
# Null hypothesis probability = 3.512684e-01
Photon flux (15-150 keV) in 96 sec: 0.230780 ( ) 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] : 13.4636 (-2.90141 3.2868)
R^2/D10^2 : 3.56197E-02 (-0.019204 0.049881)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.05 using 59 PHA bins.
# Reduced chi-squared = 1.352 for 57 degrees of freedom
# Null hypothesis probability = 3.964246e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.313e-07 3.917e-08
25- 50 4.694e-07 1.220e-07
50-150 5.487e-07 1.916e-07
15-150 1.149e-06 2.881e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 101.855 (-41.0602 -102.518)
Norm : 1.02269 (-0.181202 0.242347)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.00 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.022005e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.566e-07 5.098e-08
25- 50 4.454e-07 9.686e-08
50-150 7.292e-07 4.082e-07
15-150 1.431e-06 4.914e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.36920 (-1.17395 1.53205)
R1^2/D10^2 : 1.90828 (-1.39813 5.81484)
kT2 [keV] : 20.6178 (-4.3942 6.62956)
R2^2/D10^2 : 6.47606E-03 (-0.00410671 0.00911178)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.62 using 59 PHA bins.
# Reduced chi-squared = 0.9749 for 55 degrees of freedom
# Null hypothesis probability = 5.275688e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.018e-07 1.662e-07
25- 50 3.717e-07 1.746e-07
50-150 8.110e-07 4.798e-07
15-150 1.484e-06 6.940e-07
Peak spectrum fit
Power-law model
Time interval is from 40.500 sec. to 41.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12227 ( -2.11894 -2.11894 )
Norm@50keV : 1.58908E-03 ( -0.00159078 0.00258414 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.02 using 59 PHA bins.
# Reduced chi-squared = 0.8074 for 57 degrees of freedom
# Null hypothesis probability = 8.506744e-01
Photon flux (15-150 keV) in 1 sec: 0.252794 ( -0.252794 0.318814 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48147e-08 ( -1.48147e-08 2.49915e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.500 sec. to 41.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -10.0000 ( )
Epeak [keV] : 40.7402 ( )
Norm@50keV : 6965.53 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.86 using 59 PHA bins.
# Reduced chi-squared = 0.8190 for 56 degrees of freedom
# Null hypothesis probability = 8.310773e-01
Photon flux (15-150 keV) in 1 sec: 0.237746 0.175266 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22307e-08 ( -1.22307e-08 2.68828e-08 ) ergs/cm2
Band function
Time interval is from 40.500 sec. to 41.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.66973 ( -4.66973 -4.66973 )
beta : -4.80310 ( 4.8031 4.8031 )
Epeak [keV] : 38.7015 ( )
Norm@50keV : 12.6342 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.92 using 59 PHA bins.
# Reduced chi-squared = 0.8348 for 55 degrees of freedom
# Null hypothesis probability = 8.035592e-01
Photon flux (15-150 keV) in 1 sec: 0.251551 ( 6.74845 -0.251551 ) 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] : 9.15623 (-9.15627 -9.15627)
R^2/D10^2 : 0.175513 (-0.175512 -0.175512)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.90 using 59 PHA bins.
# Reduced chi-squared = 0.8052 for 57 degrees of freedom
# Null hypothesis probability = 8.537260e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.890e-09 2.296e-09
25- 50 6.308e-09 5.750e-09
50-150 2.536e-09 2.344e-09
15-150 1.173e-08 9.760e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.7764 (-50.0065 -50.0065)
Norm : 1.47227 (-1.46992 -1.46992)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.94 using 59 PHA bins.
# Reduced chi-squared = 0.8059 for 57 degrees of freedom
# Null hypothesis probability = 8.527610e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.596e-09 2.936e-09
25- 50 5.157e-09 4.485e-09
50-150 4.985e-09 7.365e-09
15-150 1.374e-08 1.481e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.40136 (-3.48554 -3.48554)
R1^2/D10^2 : 1.67367 (-3.17176 -3.17176)
kT2 [keV] : 9.62056 (-10.04 -10.04)
R2^2/D10^2 : 0.131410 (-0.108482 -0.108482)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.87 using 59 PHA bins.
# Reduced chi-squared = 0.8341 for 55 degrees of freedom
# Null hypothesis probability = 8.048251e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.097e-09 2.648e-09
25- 50 5.887e-09 6.120e-09
50-150 2.677e-09 1.981e-09
15-150 1.166e-08 1.754e-08
Plot creation:
Wed Oct 28 18:08:54 EDT 2015