batgrbproduct analysis for trigger=880127
batgrbproduct Analysis for Trigger=880127
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sat Dec 29 14:34:25 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger880127/GCN5_download_cron
======================================================================
Trigger: 00880127 Segment: 000
BAT Trigger Time: 567733850.56 [s; MET]
Trigger Stop: 567733851.584 [s; MET]
UTC: 2018-12-28T23:50:28.401380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 18.1589928953243 Dec: -60.9510462205385 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.61
Image Trigger?: NO
Rate S/N Ratio: 28.6181760425084 [ if not an image trigger ]
Image S/N Ratio: 6.61
Flight Position: [ source = BAT ]
RA: 18.1589928953243 Dec: -60.9510462205385 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 18.2481798110228 Dec: -60.9164235040204 [deg; J2000]
{ 01h 12m 59.6s , -60d 54' 59.1" }
+/- 3.40836621569759 [arcmin] (estimated 90% radius based on SNR)
+/- 1.98029464736509 [arcmin] (formal 1-sigma fit error)
SNR: 5.27640374839687
Angular difference between Flight and Ground position is 3.327768 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 0.720000147819519 +/- 0.195305021966266
Measured from: 0.176000118255615
to: 0.896000266075134 [s; relative to TRIGTIME]
T50: 0.399999976158142 +/- 0.288444091457054
Measured from: 0.336000204086304
to: 0.736000180244446 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0520000457763672
to: 1.05200004577637 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.160000085830688
to: 0.944000005722046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.016412 0.008621 0.051130 0.067145
0.010303 0.011412 0.012059 0.015127 [error]
Peak 0.013259 0.009749 0.056952 0.070177
0.011626 0.012850 0.013581 0.017159 [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 9.66e-10 5.73e-09 2.96e-08 6.76e-07 9.55e-08 7.13e-07 erg/cm2
Error 1.77e-09 6.06e-09 2.06e-08 1.10e-06 3.37e-08 9.84e-07 erg/cm2
Peak flux Power-law 4.97e-02 1.30e-01 2.72e-01 1.46e+00 7.32e-01 1.91e+00 ph/cm2/s
Error 7.72e-02 1.25e-01 1.89e-01 2.27e+00 2.93e-01 2.12e+00 ph/cm2/s
Fluence Cutoff-PL 1.09e-09 6.10e-09 2.98e-08 6.28e-07 9.52e-08 6.58e-07 erg/cm2
Error 1.73e-09 6.07e-09 2.38e-08 -------- 3.40e-08 -------- erg/cm2
Peak flux Cutoff-PL 5.15e-02 1.32e-01 2.72e-01 1.42e+00 7.34e-01 1.87e+00 ph/cm2/s
Error 7.70e-02 1.25e-01 2.33e-01 -------- 2.93e-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 -0.368 1.554 - - 5.36e-03 4.64e-03 71.000 57
CPL -0.343 2.055 9999.4 0.0 5.58e-03 8.76e-01 71.010 56
The chi2 of BB fit is 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 -0.068 1.840 - - 5.29e-03 4.22e-03 66.840 57
CPL -0.065 2.183 9999.4 0.0 5.40e-03 0.00e+00 66.840 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.784 0.160 0.944
T90 0.720 0.176 0.896
T50 0.400 0.336 0.736
Peak 1.000 0.052 1.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
18.2482 -60.9164 0.0365 19.3 10.2 0.1350 5.3 TRIG_00880127
------------------------------------------
Foreground time interval of the image:
0.160 0.944 (delta_t = 0.784 [sec])
Background time interval of the image:
-60.560 -49.337 (delta_t = 11.223 [sec])
-48.560 0.160 (delta_t = 48.720 [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 0.160 sec. to 0.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.367928 ( -2.15017 0.957037 )
Norm@50keV : 5.36314E-03 ( -0.00536223 0.00390907 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.00 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 57 degrees of freedom
# Null hypothesis probability = 1.006036e-01
Photon flux (15-150 keV) in 0.784 sec: 0.843247 ( -0.843247 0.3337 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.54763e-08 ( -3.38026e-08 3.3665e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.160 sec. to 0.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.342741 ( -3.18368 0.926104 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.57551E-03 ( -0.00554303 1.74568 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.01 using 59 PHA bins.
# Reduced chi-squared = 1.268 for 56 degrees of freedom
# Null hypothesis probability = 8.535433e-02
Photon flux (15-150 keV) in 0.784 sec: 0.850180 ( -0.320059 0.31711 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.51886e-08 ( -3.35905e-08 3.44113e-08 ) ergs/cm2
Band function
Time interval is from 0.160 sec. to 0.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.513040 ( 0.51249 0.51249 )
beta : 0.368154 ( -0.95758 1.41421 )
Epeak [keV] : 14.5204 ( -14.5187 -14.5187 )
Norm@50keV : 8.86774E-03 ( -0.00886812 23533.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.00 using 59 PHA bins.
# Reduced chi-squared = 1.291 for 55 degrees of freedom
# Null hypothesis probability = 7.207148e-02
Photon flux (15-150 keV) in 0.784 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] : 98.2328 (-98.2254 -98.2254)
R^2/D10^2 : 1.24699E-03 (-0.00124717 0.00866171)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.14 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 57 degrees of freedom
# Null hypothesis probability = 9.855207e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.835e-10 4.516e-10
25- 50 4.699e-09 3.606e-09
50-150 9.139e-08 8.479e-08
15-150 9.668e-08 9.824e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-115.227 -199.363)
Norm : 2.87490 (-1.40001 1.40001)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.83 using 59 PHA bins.
# Reduced chi-squared = 1.436 for 57 degrees of freedom
# Null hypothesis probability = 1.724757e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.612e-09 3.875e-09
25- 50 1.080e-08 7.326e-09
50-150 2.368e-08 1.598e-08
15-150 4.009e-08 2.769e-08
Double BB
# Reduced chi-squared = 1.219 for 55 degrees of freedom
# Reduced chi-squared = 1.217 for 55 degrees of freedom
# Reduced chi-squared = 1.215 for 55 degrees of freedom
# Reduced chi-squared = 1.215 for 55 degrees of freedom
# Null hypothesis probability = 9.074310e-02
# Null hypothesis probability = 9.779926e-02
# Null hypothesis probability = 1.123320e-01
# Null hypothesis probability = 1.223128e-01
# Null hypothesis probability = 1.272633e-01
# Null hypothesis probability = 1.274513e-01
# Null hypothesis probability = 1.302386e-01
# Null hypothesis probability = 1.316316e-01
# Null hypothesis probability = 1.320813e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.392e-09 3.063e-09
25- 50 5.647e-09 2.298e-09
50-150 8.971e-08 3.448e-08
15-150 9.975e-08 3.003e-08
Peak spectrum fit
Power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.75349E-02 ( -2.78914 0.890503 )
Norm@50keV : 5.29012E-03 ( -0.00529014 0.00315806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.84 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.749332e-01
Photon flux (15-150 keV) in 1 sec: 0.732044 ( -0.290013 0.296701 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.84788e-08 ( -3.80685e-08 3.81066e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.54105E-02 ( -2.50102 1.86552 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 5.39740E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.84 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 56 degrees of freedom
# Null hypothesis probability = 1.522230e-01
Photon flux (15-150 keV) in 1 sec: 0.733567 ( -0.290937 0.294903 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.83542e-08 ( -3.78666e-08 3.85138e-08 ) ergs/cm2
Band function
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.829048 ( 0.829048 0.829048 )
beta : 6.75284E-02 ( -0.890615 2.79374 )
Epeak [keV] : 16.2378 ( -16.2356 -16.2356 )
Norm@50keV : 7.53880E-03 ( -0.00753843 44793.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.84 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 55 degrees of freedom
# Null hypothesis probability = 1.315329e-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] : 60.5660 (-60.566 -60.566)
R^2/D10^2 : 2.45865E-03 (-0.00245865 0.0125656)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.97 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.720417e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.446e-10 5.150e-10
25- 50 6.350e-09 3.743e-09
50-150 9.189e-08 5.540e-08
15-150 9.908e-08 5.620e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-117.381 -199.363)
Norm : 2.47704 (-1.23621 1.23623)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.45 using 59 PHA bins.
# Reduced chi-squared = 1.324 for 57 degrees of freedom
# Null hypothesis probability = 5.141072e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.168e-09 4.343e-09
25- 50 1.187e-08 8.580e-09
50-150 2.602e-08 1.796e-08
15-150 4.406e-08 3.037e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.14776 (-5.18756 -5.18756)
R1^2/D10^2 : 1.22088 (-1.19818 1724.68)
kT2 [keV] : 77.4470 (-78.7574 -78.7574)
R2^2/D10^2 : 1.48637E-03 (-0.00144168 0.00926087)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.94 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 55 degrees of freedom
# Null hypothesis probability = 1.482618e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.010e-09 3.122e-09
25- 50 7.647e-09 3.872e-09
50-150 9.123e-08 6.615e-08
15-150 1.029e-07 6.340e-08
Plot creation:
Sat Dec 29 14:36:46 EST 2018