batgrbproduct Analysis for Trigger=661775
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 04:54:21 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger661775/GCN5_download_cron
======================================================================
Trigger: 00661775 Segment: 000
BAT Trigger Time: 467611119.488 [s; MET]
Trigger Stop: 467611120 [s; MET]
UTC: 2015-10-27T03:58:24.159080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.491599210451 Dec: 61.3808915516615 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.26
Image Trigger?: NO
Rate S/N Ratio: 29.1547594742265 [ if not an image trigger ]
Image S/N Ratio: 9.26
Flight Position: [ source = BAT ]
RA: 272.491599210451 Dec: 61.3808915516615 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.498176794594 Dec: 61.3610024881433 [deg; J2000]
{ 18h 09m 59.6s , +61d 21' 39.6" }
+/- 1.09139413663534 [arcmin] (estimated 90% radius based on SNR)
+/- 0.376726034959086 [arcmin] (formal 1-sigma fit error)
SNR: 26.8447230721506
Angular difference between Flight and Ground position is 1.208233 arcmin
Partial Coding Fraction: 0.1894531 [ including projection effects ]
Duration
T90: 129.651999950409 +/- 5.47526252023579
Measured from: 0.65200012922287
to: 130.304000079632 [s; relative to TRIGTIME]
T50: 94.5759999752045 +/- 6.66225692853002
Measured from: 19.0040001273155
to: 113.58000010252 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.203999996185303
to: 1.2039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.739999949932098
to: 167.776000022888 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.256558 4.347462 3.319655 0.987880
0.100064 0.103666 0.090810 0.076611 [error]
Peak 0.161779 0.262111 0.285139 0.118424
0.017709 0.020566 0.020398 0.015647 [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 1.33e-06 2.14e-06 2.60e-06 6.20e-06 7.86e-06 1.23e-05 erg/cm2
Error 7.63e-08 7.13e-08 9.33e-08 5.00e-07 2.31e-07 5.51e-07 erg/cm2
Peak flux Power-law 1.86e+00 2.19e+00 1.86e+00 2.67e+00 6.86e+00 8.58e+00 ph/cm2/s
Error 2.94e-01 2.11e-01 1.58e-01 4.82e-01 5.71e-01 6.73e-01 ph/cm2/s
Fluence Cutoff-PL 1.30e-06 2.16e-06 2.63e-06 5.43e-06 7.81e-06 1.15e-05 erg/cm2
Error 9.83e-08 7.58e-08 1.07e-07 1.22e-06 2.48e-07 1.18e-06 erg/cm2
Peak flux Cutoff-PL 1.86e+00 2.19e+00 1.86e+00 2.65e+00 6.86e+00 8.56e+00 ph/cm2/s
Error 3.33e-01 2.16e-01 1.81e-01 7.57e-01 5.77e-01 9.36e-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 1.720 0.054 - - 5.04e-03 1.46e-04 42.060 57
CPL 1.615 0.179 203.5 0.0 5.63e-03 0.00e+00 41.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.239 0.135 - - 5.81e-02 4.52e-03 49.520 57
CPL 1.234 0.329 9998.4 0.0 5.84e-02 2.19e-02 49.520 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: 120.960000 sec.
T50 in the 50-300 keV band: 105.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 168.516 -0.740 167.776
T90 129.652 0.652 130.304
T50 94.576 19.004 113.580
Peak 1.000 0.204 1.204
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.4982 +61.3610 0.0071 51.8 1.2 3.1237 26.8 TRIG_00661775
------------------------------------------
Foreground time interval of the image:
-0.740 8.213 (delta_t = 8.953 [sec])
Background time interval of the image:
-49.287 -12.168 (delta_t = 37.119 [sec])
-11.488 -0.740 (delta_t = 10.748 [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 -0.740 sec. to 167.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72018 ( -0.0542032 0.0543958 )
Norm@50keV : 5.04302E-03 ( -0.000146018 0.00014599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.06 using 59 PHA bins.
# Reduced chi-squared = 0.7379 for 57 degrees of freedom
# Null hypothesis probability = 9.306072e-01
Photon flux (15-150 keV) in 168.5 sec: 0.674562 ( -0.022772 0.0228843 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.85586e-06 ( -2.31133e-07 2.31244e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.740 sec. to 167.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61520 ( -0.220714 0.137253 )
Epeak [keV] : 203.543 ( )
Norm@50keV : 5.63101E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.36 using 59 PHA bins.
# Reduced chi-squared = 0.7386 for 56 degrees of freedom
# Null hypothesis probability = 9.281297e-01
Photon flux (15-150 keV) in 168.5 sec: 0.668651 ( -0.025358 0.025451 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.81326e-06 ( -2.497e-07 2.45757e-07 ) ergs/cm2
Band function
Time interval is from -0.740 sec. to 167.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34963 ( 1.26783 1.26783 )
beta : -1.77455 ( 1.77288 0.102218 )
Epeak [keV] : 72.4445 ( -67.7209 -67.7209 )
Norm@50keV : 8.06082E-03 ( -0.00318058 51.1443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.66 using 59 PHA bins.
# Reduced chi-squared = 0.7393 for 55 degrees of freedom
# Null hypothesis probability = 9.254987e-01
Photon flux (15-150 keV) in 168.5 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] : 15.4032 ( )
R^2/D10^2 : 6.29792E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 340.58 using 59 PHA bins.
# Reduced chi-squared = 5.9750 for 57 degrees of freedom
# Null hypothesis probability = 5.243012e-42
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.247e-07 3.092e-08
25- 50 2.136e-06 8.931e-08
50-150 3.488e-06 1.921e-07
15-150 6.148e-06 1.896e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 152.473 (-20.9775 21.7744)
Norm : 2.70717 (-0.0999669 0.12292)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.40 using 59 PHA bins.
# Reduced chi-squared = 0.8316 for 57 degrees of freedom
# Null hypothesis probability = 8.136391e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.170e-06 7.144e-08
25- 50 2.174e-06 1.188e-07
50-150 4.319e-06 9.621e-07
15-150 7.663e-06 1.088e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.74820 (-0.743502 0.771347)
R1^2/D10^2 : 0.537715 (-0.149257 0.231152)
kT2 [keV] : 28.8236 (-3.10426 4.18407)
R2^2/D10^2 : 4.91212E-03 (-0.00189974 0.00264082)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.83 using 59 PHA bins.
# Reduced chi-squared = 0.9606 for 55 degrees of freedom
# Null hypothesis probability = 5.578274e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.070e-06 9.815e-08
25- 50 2.256e-06 1.415e-07
50-150 4.356e-06 3.977e-07
15-150 7.681e-06 5.240e-07
Peak spectrum fit
Power-law model
Time interval is from 0.204 sec. to 1.204 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23871 ( -0.135397 0.133917 )
Norm@50keV : 5.81291E-02 ( -0.00452906 0.00451752 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.52 using 59 PHA bins.
# Reduced chi-squared = 0.8688 for 57 degrees of freedom
# Null hypothesis probability = 7.487890e-01
Photon flux (15-150 keV) in 1 sec: 6.86270 ( -0.569458 0.571856 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.83499e-07 ( -4.74948e-08 4.75956e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.204 sec. to 1.204 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23422 ( -0.522029 0.135235 )
Epeak [keV] : 9998.43 ( -9998.43 -9998.43 )
Norm@50keV : 5.83994E-02 ( -0.0045011 0.0393857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.52 using 59 PHA bins.
# Reduced chi-squared = 0.8843 for 56 degrees of freedom
# Null hypothesis probability = 7.170625e-01
Photon flux (15-150 keV) in 1 sec: 6.86017 ( -0.58339 0.57003 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84811e-07 ( -4.9276e-08 4.6578e-08 ) ergs/cm2
Band function
Time interval is from 0.204 sec. to 1.204 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.82364 ( -4.82364 -4.82364 )
beta : -1.26782 ( -0.145431 0.142927 )
Epeak [keV] : 24.3367 ( -24.3367 5.99684 )
Norm@50keV : 4165.95 ( -321.271 1.69963e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.18 using 59 PHA bins.
# Reduced chi-squared = 0.8943 for 55 degrees of freedom
# Null hypothesis probability = 6.953705e-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] : 21.0242 (-2.13512 2.44466)
R^2/D10^2 : 0.265293 (-0.0810363 0.113847)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.66 using 59 PHA bins.
# Reduced chi-squared = 1.626 for 57 degrees of freedom
# Null hypothesis probability = 1.976237e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.214e-08 3.600e-09
25- 50 1.139e-07 1.450e-08
50-150 3.753e-07 4.425e-08
15-150 5.113e-07 4.890e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-16.7879 -200)
Norm : 29.0931 (-2.29149 2.29149)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.78 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 57 degrees of freedom
# Null hypothesis probability = 1.553677e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.247e-08 6.655e-09
25- 50 1.394e-07 1.855e-08
50-150 3.057e-07 9.950e-08
15-150 5.176e-07 9.825e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.40067 (-1.69296 2.08304)
R1^2/D10^2 : 5.23337 (-2.9426 8.14247)
kT2 [keV] : 33.1403 (-6.11597 11.5098)
R2^2/D10^2 : 5.12530E-02 (-0.0309824 0.0504395)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8759 for 55 degrees of freedom
# Null hypothesis probability = 7.309577e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.687e-08 2.081e-08
25- 50 1.270e-07 4.275e-08
50-150 4.078e-07 1.245e-07
15-150 5.917e-07 1.983e-07
Plot creation:
Wed Oct 28 05:02:46 EDT 2015