batgrbproduct Analysis for Trigger=676423
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 28 08:49:50 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger676423
======================================================================
Trigger: 00676423 Segment: 000
BAT Trigger Time: 478294344 [s; MET]
Trigger Stop: 478294416 [s; MET]
UTC: 2016-02-27T19:32:08.096040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 194.788571324558 Dec: 78.6392014846058 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.02
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.02
Flight Position: [ source = BAT ]
RA: 194.788571324558 Dec: 78.6392014846058 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 195.033726915832 Dec: 78.6721985463556 [deg; J2000]
{ 13h 00m 08.1s , +78d 40' 19.9" }
+/- 2.83561595939957 [arcmin] (estimated 90% radius based on SNR)
+/- 1.16379395960203 [arcmin] (formal 1-sigma fit error)
SNR: 6.86245042388509
Angular difference between Flight and Ground position is 3.505905 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 316.544000029564 +/- 75.3682152632844
Measured from: -93.0960000157356
to: 223.448000013828 [s; relative to TRIGTIME]
T50: 185.504000008106 +/- 13.8431441578225
Measured from: 13.4480000138283
to: 198.952000021935 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 198.620000004768
to: 199.620000004768 [s; relative to TRIGTIME]
Total Fluence
Measured from: -99.7519999742508
to: 236.184000015259 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.457564 2.289112 1.378967 0.330014
0.109891 0.110139 0.095125 0.078505 [error]
Peak 0.010043 0.031023 0.033464 0.008931
0.004758 0.004990 0.004355 0.003477 [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 5.20e-07 8.70e-07 1.10e-06 2.81e-06 3.27e-06 5.30e-06 erg/cm2
Error 5.10e-08 5.36e-08 9.18e-08 4.87e-07 2.20e-07 5.65e-07 erg/cm2
Peak flux Power-law 1.49e-01 1.96e-01 1.90e-01 3.28e-01 6.43e-01 8.63e-01 ph/cm2/s
Error 5.05e-02 4.19e-02 3.29e-02 1.18e-01 1.13e-01 1.49e-01 ph/cm2/s
Fluence Cutoff-PL 4.53e-07 9.53e-07 1.14e-06 8.51e-07 3.05e-06 3.39e-06 erg/cm2
Error 6.12e-08 7.03e-08 1.04e-07 5.12e-07 2.47e-07 5.59e-07 erg/cm2
Peak flux Cutoff-PL 8.73e-02 2.23e-01 2.27e-01 6.57e-02 5.90e-01 6.02e-01 ph/cm2/s
Error 6.18e-02 5.34e-02 4.45e-02 -------- 1.23e-01 1.54e-01 ph/cm2/s
Fluence Band 4.44e-07 9.58e-07 1.11e-06 1.40e-06 3.06e-06 3.93e-06 erg/cm2
Error 7.03e-08 8.65e-08 -------- -------- 2.63e-07 -------- 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 1.654 0.104 - - 1.05e-03 6.62e-05 51.620 57
CPL 0.747 0.514 65.8 16.4 3.12e-03 2.08e-03 40.420 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.047 0.274 - - 5.57e-03 9.49e-04 75.840 57
CPL -1.220 2.439 76.2 55.6 6.30e-02 6.82e-01 71.100 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: 253.952000 sec.
T50 in the 50-300 keV band: 159.424000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 335.936 -99.752 236.184
T90 316.544 -93.096 223.448
T50 185.504 13.448 198.952
Peak 1.000 198.620 199.620
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
195.0337 78.6722 0.0280 27.1336 -82.6992 1.7880554 6.862 TRIG_00676423
Foreground time interval of the image:
-99.752 93.301 (delta_t = 193.053 [sec])
Background time interval of the image:
-239.000 -99.752 (delta_t = 139.248 [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 -99.752 sec. to 236.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65437 ( -0.10367 0.104912 )
Norm@50keV : 1.04863E-03 ( -6.63954e-05 6.60721e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.62 using 59 PHA bins.
# Reduced chi-squared = 0.9056 for 57 degrees of freedom
# Null hypothesis probability = 6.764100e-01
Photon flux (15-150 keV) in 335.9 sec: 0.137122 ( -0.0084383 0.00844964 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27449e-06 ( -2.19046e-07 2.20434e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -99.752 sec. to 236.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.746891 ( -0.544255 0.483501 )
Epeak [keV] : 65.7679 ( -9.78619 23.1073 )
Norm@50keV : 3.11632E-03 ( -0.00135147 0.00281653 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.42 using 59 PHA bins.
# Reduced chi-squared = 0.7217 for 56 degrees of freedom
# Null hypothesis probability = 9.420396e-01
Photon flux (15-150 keV) in 335.9 sec: 0.131396 ( -0.008926 0.008938 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.04519e-06 ( -2.4559e-07 2.4914e-07 ) ergs/cm2
Band function
Time interval is from -99.752 sec. to 236.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.620882 ( -0.560888 1.7946 )
beta : -2.42881 ( 2.42796 0.616953 )
Epeak [keV] : 61.6743 ( -23.7776 23.1805 )
Norm@50keV : 3.69897E-03 ( -0.00192326 0.0735882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.89 using 59 PHA bins.
# Reduced chi-squared = 0.7253 for 55 degrees of freedom
# Null hypothesis probability = 9.374288e-01
Photon flux (15-150 keV) in 335.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06101e-06 ( -3.05866e-06 -2.48344e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.3273 (-0.894266 0.966013)
R^2/D10^2 : 2.33087E-02 (-0.00527592 0.00674407)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.32 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.160222e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.947e-07 3.089e-08
25- 50 1.042e-06 7.457e-08
50-150 1.187e-06 1.542e-07
15-150 2.524e-06 1.765e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 143.184 (-34.5386 49.3205)
Norm : 0.569596 (-0.0397715 0.0478527)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.69 using 59 PHA bins.
# Reduced chi-squared = 0.7665 for 57 degrees of freedom
# Null hypothesis probability = 9.024547e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.892e-07 4.283e-08
25- 50 9.026e-07 1.114e-07
50-150 1.758e-06 5.949e-07
15-150 3.150e-06 7.049e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.81201 (-2.11423 2.15732)
R1^2/D10^2 : 9.56530E-02 (-0.0454623 0.10144)
kT2 [keV] : 22.4207 (-5.06866 13.535)
R2^2/D10^2 : 2.39319E-03 (-0.00198525 0.0048013)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.45 using 59 PHA bins.
# Reduced chi-squared = 0.7536 for 55 degrees of freedom
# Null hypothesis probability = 9.117594e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.223e-07 1.184e-07
25- 50 9.808e-07 2.806e-07
50-150 1.631e-06 7.385e-07
15-150 3.034e-06 9.869e-07
Peak spectrum fit
Power-law model
Time interval is from 198.620 sec. to 199.620 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04666 ( -0.282995 0.265112 )
Norm@50keV : 5.56909E-03 ( -0.000952918 0.000945036 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.84 using 59 PHA bins.
# Reduced chi-squared = 1.331 for 57 degrees of freedom
# Null hypothesis probability = 4.828029e-02
Photon flux (15-150 keV) in 1 sec: 0.643048 ( -0.112704 0.113636 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.9254e-08 ( -1.01917e-08 1.02459e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 198.620 sec. to 199.620 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.22046 ( -3.03861 1.83989 )
Epeak [keV] : 76.2037 ( -16.3684 94.8571 )
Norm@50keV : 6.30095E-02 ( -0.0635873 1.30014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.10 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 56 degrees of freedom
# Null hypothesis probability = 8.418183e-02
Photon flux (15-150 keV) in 1 sec: 0.590386 ( -0.123206 0.12352 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16582e-08 ( -1.18562e-08 1.23744e-08 ) ergs/cm2
Band function
Time interval is from 198.620 sec. to 199.620 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.49112 ( -2.61649 -2.3548 )
beta : -2.04638 ( -6.22205 0.729738 )
Epeak [keV] : 58.2840 ( -18.345 36.8943 )
Norm@50keV : 0.923740 ( -0.910732 2.24854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.47 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 55 degrees of freedom
# Null hypothesis probability = 1.048024e-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] : 18.9247 (-2.9647 3.95975)
R^2/D10^2 : 3.89991E-02 (-0.0185691 0.0307174)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.34 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.586119e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.749e-09 8.765e-10
25- 50 1.319e-08 3.875e-09
50-150 3.468e-08 9.630e-09
15-150 5.062e-08 1.153e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-43.7797 -200)
Norm : 2.72318 (-0.470428 0.470428)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.29 using 59 PHA bins.
# Reduced chi-squared = 1.479 for 57 degrees of freedom
# Null hypothesis probability = 1.088179e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.781e-09 3.966e-09
25- 50 1.304e-08 7.385e-09
50-150 2.861e-08 1.641e-08
15-150 4.843e-08 2.808e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.34 using 59 PHA bins.
#Fit statistic : Chi-Squared = 69.15 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.75 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.63 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 55 degrees of freedom
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Reduced chi-squared = 1.232 for 55 degrees of freedom
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 6.840630e-02
# Null hypothesis probability = 9.500759e-02
# Null hypothesis probability = 1.159372e-01
# Null hypothesis probability = 1.179176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Sun Feb 28 12:09:55 EST 2016