batgrbproduct Analysis for Trigger=674734
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): Sun Feb 21 07:37:40 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger674734/GCN5_download_cron
======================================================================
Trigger: 00674734 Segment: 000
BAT Trigger Time: 477659469.696 [s; MET]
Trigger Stop: 477659470.72 [s; MET]
UTC: 2016-02-20T11:10:53.826540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 259.854260978407 Dec: -18.1230465541461 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.83
Image Trigger?: NO
Rate S/N Ratio: 20.8086520466848 [ if not an image trigger ]
Image S/N Ratio: 10.83
Flight Position: [ source = BAT ]
RA: 259.854260978407 Dec: -18.1230465541461 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 259.850808642126 Dec: -18.1227364103901 [deg; J2000]
{ 17h 19m 24.2s , -18d 07' 21.9" }
+/- 0.693808511789594 [arcmin] (estimated 90% radius based on SNR)
+/- 0.220123678658102 [arcmin] (formal 1-sigma fit error)
SNR: 51.2765642351761
Angular difference between Flight and Ground position is 0.197742 arcmin
Partial Coding Fraction: 0.3867188 [ including projection effects ]
Duration
T90: 31.3599999547005 +/- 2.55184091742984
Measured from: -3.64399987459183
to: 27.7160000801086 [s; relative to TRIGTIME]
T50: 8.28799992799759 +/- 0.548802335859839
Measured from: 4.80400013923645
to: 13.092000067234 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.46000003814697
to: 7.46000003814697 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.57599997520447
to: 37.5400000214577 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.782560 3.410940 3.483641 1.120876
0.078158 0.082986 0.074868 0.057078 [error]
Peak 0.127431 0.279437 0.320213 0.112736
0.013536 0.016540 0.016708 0.012705 [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 6.70e-07 1.48e-06 2.59e-06 1.06e-05 7.09e-06 1.53e-05 erg/cm2
Error 3.79e-08 5.02e-08 7.32e-08 6.83e-07 1.90e-07 7.10e-07 erg/cm2
Peak flux Power-law 1.44e+00 1.98e+00 2.01e+00 3.70e+00 6.62e+00 9.14e+00 ph/cm2/s
Error 1.74e-01 1.50e-01 1.26e-01 4.81e-01 4.09e-01 5.86e-01 ph/cm2/s
Fluence Cutoff-PL 5.89e-07 1.51e-06 2.73e-06 6.45e-06 6.99e-06 1.13e-05 erg/cm2
Error 4.89e-08 5.39e-08 9.35e-08 1.30e-06 1.98e-07 1.29e-06 erg/cm2
Peak flux Cutoff-PL 1.13e+00 2.07e+00 2.25e+00 1.85e+00 6.46e+00 7.29e+00 ph/cm2/s
Error 2.18e-01 1.69e-01 1.73e-01 6.10e-01 4.17e-01 7.28e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.13e+00 2.07e+00 2.25e+00 2.21e+00 6.45e+00 7.67e+00 ph/cm2/s
Error -------- 1.94e-01 -------- -------- 4.23e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.195 0.046 - - 1.55e-02 4.18e-04 56.260 57
CPL 0.748 0.197 168.7 56.3 2.39e-02 4.47e-03 39.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.980 0.097 - - 5.76e-02 3.50e-03 63.770 57
CPL 0.104 0.470 128.1 47.6 1.38e-01 6.59e-02 51.420 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: 24.512000 sec.
T50 in the 50-300 keV band: 6.784000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 45.116 -7.576 37.540
T90 31.360 -3.644 27.716
T50 8.288 4.804 13.092
Peak 1.000 6.460 7.460
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
259.8508 -18.1227 0.0038 40.8 11.0 10.2806 51.3 TRIG_00674734
------------------------------------------
Foreground time interval of the image:
-7.576 37.540 (delta_t = 45.116 [sec])
Background time interval of the image:
-239.696 -7.576 (delta_t = 232.120 [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 -7.576 sec. to 37.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19503 ( -0.0466044 0.046288 )
Norm@50keV : 1.54601E-02 ( -0.000418242 0.000417557 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.26 using 59 PHA bins.
# Reduced chi-squared = 0.9871 for 57 degrees of freedom
# Null hypothesis probability = 5.027388e-01
Photon flux (15-150 keV) in 45.12 sec: 1.81345 ( -0.0531344 0.0532663 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.08718e-06 ( -1.90609e-07 1.90355e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.576 sec. to 37.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.748074 ( -0.201333 0.192502 )
Epeak [keV] : 168.728 ( -33.9004 78.6691 )
Norm@50keV : 2.38755E-02 ( -0.00397231 0.00496439 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.67 using 59 PHA bins.
# Reduced chi-squared = 0.7084 for 56 degrees of freedom
# Null hypothesis probability = 9.516156e-01
Photon flux (15-150 keV) in 45.12 sec: 1.76863 ( -0.05588 0.05607 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.98728e-06 ( -1.98122e-07 1.97445e-07 ) ergs/cm2
Band function
Time interval is from -7.576 sec. to 37.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.748235 ( -0.191927 0.0953483 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 168.790 ( -17.3727 53.5026 )
Norm@50keV : 2.38731E-02 ( -0.0029477 0.00298613 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.67 using 59 PHA bins.
# Reduced chi-squared = 0.7212 for 55 degrees of freedom
# Null hypothesis probability = 9.406176e-01
Photon flux (15-150 keV) in 45.12 sec: 1.75498 ( 5.24502 -0.05948 ) 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] : 21.3315 ( )
R^2/D10^2 : 6.78735E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 242.40 using 59 PHA bins.
# Reduced chi-squared = 4.2526 for 57 degrees of freedom
# Null hypothesis probability = 1.027678e-24
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.615e-07 1.381e-08
25- 50 1.357e-06 6.024e-08
50-150 4.608e-06 1.755e-07
15-150 6.227e-06 1.805e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 ( )
Norm : 7.88016 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 236.90 using 59 PHA bins.
# Reduced chi-squared = 4.1561 for 57 degrees of freedom
# Null hypothesis probability = 8.611144e-24
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.853e-07 2.549e-08
25- 50 1.703e-06 5.031e-08
50-150 3.735e-06 1.092e-07
15-150 6.324e-06 1.895e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.68737 (-1.01628 1.13634)
R1^2/D10^2 : 0.682760 (-0.209899 0.329275)
kT2 [keV] : 31.8095 (-2.76024 3.79215)
R2^2/D10^2 : 1.52159E-02 (-0.00492789 0.00580004)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.84 using 59 PHA bins.
# Reduced chi-squared = 0.6699 for 55 degrees of freedom
# Null hypothesis probability = 9.715372e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.487e-07 6.272e-08
25- 50 1.554e-06 1.101e-07
50-150 4.915e-06 3.522e-07
15-150 7.018e-06 3.971e-07
Peak spectrum fit
Power-law model
Time interval is from 6.460 sec. to 7.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.980480 ( -0.0981998 0.0967126 )
Norm@50keV : 5.75929E-02 ( -0.00350256 0.0034937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.77 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 57 degrees of freedom
# Null hypothesis probability = 2.507007e-01
Photon flux (15-150 keV) in 1 sec: 6.62429 ( -0.408952 0.409758 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2708e-07 ( -3.95299e-08 3.9729e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.460 sec. to 7.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.103864 ( -0.495506 0.444876 )
Epeak [keV] : 128.063 ( -26.1467 69.1342 )
Norm@50keV : 0.138319 ( -0.0485039 0.0833868 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.42 using 59 PHA bins.
# Reduced chi-squared = 0.9183 for 56 degrees of freedom
# Null hypothesis probability = 6.485487e-01
Photon flux (15-150 keV) in 1 sec: 6.46289 ( -0.41684 0.4175 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1341e-07 ( -4.1601e-08 4.139e-08 ) ergs/cm2
Band function
Time interval is from 6.460 sec. to 7.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.02330E-02 ( -0.451836 2.14313 )
beta : -1.87031 ( 1.90992 0.738969 )
Epeak [keV] : 123.021 ( -65.9363 69.4884 )
Norm@50keV : 0.145630 ( -0.0519344 1.38302 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.31 using 59 PHA bins.
# Reduced chi-squared = 0.9328 for 55 degrees of freedom
# Null hypothesis probability = 6.165853e-01
Photon flux (15-150 keV) in 1 sec: 6.44512 ( 0.55488 -0.4213 ) 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] : 22.3476 (-1.56322 1.73925)
R^2/D10^2 : 0.236991 (-0.0505196 0.0621235)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.20 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.773216e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.175e-08 2.635e-09
25- 50 1.160e-07 1.030e-08
50-150 4.331e-07 3.990e-08
15-150 5.709e-07 3.980e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 26.9455 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 151.48 using 59 PHA bins.
# Reduced chi-squared = 2.6575 for 57 degrees of freedom
# Null hypothesis probability = 1.662456e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.710e-08 4.800e-09
25- 50 1.291e-07 1.220e-08
50-150 2.831e-07 6.765e-08
15-150 4.792e-07 9.070e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.0608 (-3.8407 5.42753)
R1^2/D10^2 : 1.16500 (-0.674358 2.38819)
kT2 [keV] : 31.0400 (-5.84417 27.2081)
R2^2/D10^2 : 6.86654E-02 (-0.0603703 0.0800737)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.62 using 59 PHA bins.
# Reduced chi-squared = 0.9385 for 55 degrees of freedom
# Null hypothesis probability = 6.046928e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.420e-08 1.564e-08
25- 50 1.237e-07 4.949e-08
50-150 4.573e-07 1.905e-07
15-150 6.152e-07 2.284e-07
Plot creation:
Sun Feb 21 07:47:15 EST 2016