batgrbproduct analysis for trigger=870201
batgrbproduct Analysis for Trigger=870201
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): Sun Nov 4 01:08:14 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger870201/GCN5_download_cron
======================================================================
Trigger: 00870201 Segment: 000
BAT Trigger Time: 562911772.288 [s; MET]
Trigger Stop: 562911774.336 [s; MET]
UTC: 2018-11-03T04:22:30.430260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 197.10891460287 Dec: 52.2305069576985 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: NO
Rate S/N Ratio: 10.770329614269 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 197.10891460287 Dec: 52.2305069576985 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 197.09277072898 Dec: 52.2199472433238 [deg; J2000]
{ 13h 08m 22.3s , +52d 13' 11.8" }
+/- 2.0064962070683 [arcmin] (estimated 90% radius based on SNR)
+/- 0.927356729629006 [arcmin] (formal 1-sigma fit error)
SNR: 11.2476968878924
Angular difference between Flight and Ground position is 0.868035 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 8.38399982452393 +/- 2.41000585275786
Measured from: -0.503999829292297
to: 7.87999999523163 [s; relative to TRIGTIME]
T50: 3.4559999704361 +/- 1.2959012195006
Measured from: 0.456000089645386
to: 3.91200006008148 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.460000038146973
to: 0.539999961853027 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.888000011444092
to: 10.1840000152588 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.216134 0.188059 0.109277 0.051521
0.025397 0.026304 0.022342 0.019210 [error]
Peak 0.030629 0.049506 0.018770 0.015860
0.007783 0.008319 0.007158 0.005781 [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 5.70e-08 8.22e-08 8.81e-08 1.76e-07 2.82e-07 4.03e-07 erg/cm2
Error 1.13e-08 1.16e-08 2.16e-08 8.58e-08 4.98e-08 1.09e-07 erg/cm2
Peak flux Power-law 3.11e-01 2.78e-01 1.71e-01 1.60e-01 8.29e-01 9.21e-01 ph/cm2/s
Error 1.02e-01 6.30e-02 5.55e-02 1.01e-01 1.87e-01 2.14e-01 ph/cm2/s
Fluence Cutoff-PL 5.67e-08 8.32e-08 8.78e-08 1.46e-07 2.79e-07 3.74e-07 erg/cm2
Error 1.17e-08 1.43e-08 2.31e-08 1.15e-07 5.56e-08 1.44e-07 erg/cm2
Peak flux Cutoff-PL 3.07e-01 2.95e-01 1.69e-01 8.32e-02 8.21e-01 8.53e-01 ph/cm2/s
Error 1.05e-01 9.64e-02 1.41e-02 1.37e-01 1.53e-01 1.53e-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 1.900 0.267 - - 2.77e-03 4.94e-04 45.430 57
CPL 1.813 0.000 88.2 0.0 3.12e-03 0.00e+00 45.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.700 0.382 - - 6.24e-03 1.59e-03 77.490 57
CPL -9.998 -2.607 29.3 2.7 1.11e+06 1.93e+06 70.670 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: 5.952000 sec.
T50 in the 50-300 keV band: 3.008000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 11.072 -0.888 10.184
T90 8.384 -0.504 7.880
T50 3.456 0.456 3.912
Peak 1.000 -0.460 0.540
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
197.0928 +52.2199 0.0172 20.7 -115.3 0.5369 11.2 TRIG_00870201
------------------------------------------
Foreground time interval of the image:
-0.888 10.184 (delta_t = 11.072 [sec])
Background time interval of the image:
-239.288 -0.888 (delta_t = 238.400 [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 -0.888 sec. to 10.184 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90004 ( -0.258146 0.275894 )
Norm@50keV : 2.76844E-03 ( -0.000502593 0.000486028 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.43 using 59 PHA bins.
# Reduced chi-squared = 0.7970 for 57 degrees of freedom
# Null hypothesis probability = 8.650604e-01
Photon flux (15-150 keV) in 11.07 sec: 0.397306 ( -0.055761 0.0557615 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81755e-07 ( -4.90063e-08 5.05338e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.888 sec. to 10.184 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81291 ( )
Epeak [keV] : 88.2298 ( )
Norm@50keV : 3.11684E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.41 using 59 PHA bins.
# Reduced chi-squared = 0.8108 for 56 degrees of freedom
# Null hypothesis probability = 8.432630e-01
Photon flux (15-150 keV) in 11.07 sec: 0.396080 ( -0.057171 0.05662 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78838e-07 ( -5.84839e-08 5.28094e-08 ) ergs/cm2
Band function
Time interval is from -0.888 sec. to 10.184 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.89048 ( -4.89048 -4.89048 )
beta : -2.06996 ( -0.456006 0.320493 )
Epeak [keV] : 22.8631 ( -22.8631 4.65224 )
Norm@50keV : 628.903 ( -87.8019 3.16577e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.01 using 59 PHA bins.
# Reduced chi-squared = 0.8001 for 55 degrees of freedom
# Null hypothesis probability = 8.560179e-01
Photon flux (15-150 keV) in 11.07 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] : 9.33624 (-1.62881 2.05982)
R^2/D10^2 : 0.238496 (-0.126027 0.258086)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.89 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.062630e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.561e-08 1.287e-08
25- 50 1.026e-07 2.340e-08
50-150 4.373e-08 1.777e-08
15-150 1.919e-07 4.168e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.3028 (-29.9593 69.8818)
Norm : 1.88753 (-0.185483 0.495558)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.03 using 59 PHA bins.
# Reduced chi-squared = 0.8076 for 57 degrees of freedom
# Null hypothesis probability = 8.503833e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.409e-08 1.017e-08
25- 50 8.830e-08 1.683e-08
50-150 1.218e-07 7.463e-08
15-150 2.642e-07 7.350e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.97143 (-1.70752 2.03953)
R1^2/D10^2 : 1.02473 (-0.661731 2.58346)
kT2 [keV] : 24.8691 (-9.86574 47.9434)
R2^2/D10^2 : 4.40262E-03 (-0.00416379 0.0149815)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.12 using 59 PHA bins.
# Reduced chi-squared = 0.8021 for 55 degrees of freedom
# Null hypothesis probability = 8.532365e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.863e-08 2.862e-08
25- 50 8.239e-08 4.072e-08
50-150 1.411e-07 8.244e-08
15-150 2.821e-07 1.517e-07
Peak spectrum fit
Power-law model
Time interval is from -0.460 sec. to 0.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70049 ( -0.37333 0.390265 )
Norm@50keV : 6.23972E-03 ( -0.00161308 0.00156585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.49 using 59 PHA bins.
# Reduced chi-squared = 1.359 for 57 degrees of freedom
# Null hypothesis probability = 3.685953e-02
Photon flux (15-150 keV) in 1 sec: 0.828846 ( -0.186861 0.1869 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.777e-08 ( -1.51986e-08 1.57606e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.460 sec. to 0.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99764 ( 9.99919 4.78467 )
Epeak [keV] : 29.2685 ( -2.55146 2.79238 )
Norm@50keV : 1.10716E+06 ( -1.11194e+06 2.75596e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.67 using 59 PHA bins.
# Reduced chi-squared = 1.262 for 56 degrees of freedom
# Null hypothesis probability = 8.966932e-02
Photon flux (15-150 keV) in 1 sec: 0.821129 0.717530 0.714630 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7394e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.460 sec. to 0.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.41407 -5 )
beta : -2.72555 ( -2.32328 0.817164 )
Epeak [keV] : 29.9244 ( -4.88878 4.4472 )
Norm@50keV : 340.325 ( -71.2869 659.701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.26 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 55 degrees of freedom
# Null hypothesis probability = 9.350763e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2863e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.41626 (-1.55412 2.23055)
R^2/D10^2 : 0.789839 (-0.475357 0.951077)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.12 using 59 PHA bins.
# Reduced chi-squared = 1.353 for 57 degrees of freedom
# Null hypothesis probability = 3.914645e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.048e-08 4.474e-09
25- 50 1.999e-08 8.354e-09
50-150 6.185e-09 4.342e-09
15-150 3.665e-08 1.444e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 109.371 (-62.0758 -108.829)
Norm : 3.62807 (-0.943526 1.45306)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.22 using 59 PHA bins.
# Reduced chi-squared = 1.355 for 57 degrees of freedom
# Null hypothesis probability = 3.852977e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.476e-09 5.421e-09
25- 50 1.667e-08 9.795e-09
50-150 2.838e-08 2.080e-08
15-150 5.452e-08 3.491e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.41523 (-1.46554 1.03527)
R1^2/D10^2 : 1.15025 (-0.659295 0.811261)
kT2 [keV] : 64.7073 (-64.1128 -64.1129)
R2^2/D10^2 : 6.65563E-04 (-0.000636633 0.00953318)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.56 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 55 degrees of freedom
# Null hypothesis probability = 8.945010e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.099e-08 6.240e-09
25- 50 1.829e-08 1.071e-08
50-150 3.194e-08 1.718e-08
15-150 6.123e-08 3.002e-08
Plot creation:
Sun Nov 4 01:17:32 EDT 2018