batgrbproduct analysis for trigger=741965
batgrbproduct Analysis for Trigger=741965
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 Mar 12 13:41:44 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger741965/GCN5_download_cron
======================================================================
Trigger: 00741965 Segment: 000
BAT Trigger Time: 510912541.696 [s; MET]
Trigger Stop: 510912545.792 [s; MET]
UTC: 2017-03-11T08:08:42.959380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.563140731264 Dec: -30.0629025629876 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.33
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 7.33
Flight Position: [ source = BAT ]
RA: 280.563140731264 Dec: -30.0629025629876 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.53922028331 Dec: -30.040839773871 [deg; J2000]
{ 18h 42m 09.4s , -30d 02' 27.0" }
+/- 2.02393159360432 [arcmin] (estimated 90% radius based on SNR)
+/- 0.845059127662672 [arcmin] (formal 1-sigma fit error)
SNR: 11.1095320447219
Angular difference between Flight and Ground position is 1.815393 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 6.31599992513657 +/- 0.96083295141137
Measured from: -0.563999831676483
to: 5.75200009346008 [s; relative to TRIGTIME]
T50: 3.783999979496 +/- 1.83555989372279
Measured from: 0.38400012254715
to: 4.16800010204315 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.73199999332428
to: 2.73199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.919999957084656
to: 6.08000004291534 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.101885 0.146219 0.085792 0.045244
0.021488 0.021830 0.019036 0.015451 [error]
Peak 0.021529 0.035539 0.031119 0.021524
0.008462 0.008315 0.007873 0.005888 [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 2.92e-08 5.81e-08 8.98e-08 3.04e-07 2.51e-07 4.82e-07 erg/cm2
Error 9.33e-09 1.07e-08 1.95e-08 1.55e-07 4.73e-08 1.67e-07 erg/cm2
Peak flux Power-law 2.17e-01 2.64e-01 2.34e-01 3.55e-01 8.39e-01 1.07e+00 ph/cm2/s
Error 1.04e-01 7.58e-02 6.22e-02 2.13e-01 2.03e-01 2.63e-01 ph/cm2/s
Fluence Cutoff-PL 2.96e-08 5.83e-08 8.93e-08 2.96e-07 2.50e-07 4.73e-07 erg/cm2
Error 9.33e-09 1.01e-08 1.94e-08 1.38e-07 4.56e-08 1.79e-07 erg/cm2
Peak flux Cutoff-PL 2.22e-01 2.67e-01 2.32e-01 3.44e-01 8.41e-01 1.07e+00 ph/cm2/s
Error 8.41e-02 7.62e-02 6.45e-02 3.03e-01 2.04e-01 2.89e-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 1.372 0.325 - - 3.69e-03 6.14e-04 57.590 57
CPL 2.508 0.635 166.9 0.0 9.12e-04 0.00e+00 55.060 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.179 0.440 - - 7.17e-03 1.66e-03 46.430 57
CPL 1.178 0.443 9999.2 0.0 7.20e-03 1.79e-03 46.440 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: 1.600000 sec.
T50 in the 50-300 keV band: 0.768000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.000 -0.920 6.080
T90 6.316 -0.564 5.752
T50 3.784 0.384 4.168
Peak 1.000 1.732 2.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.5392 -30.0408 0.0173 26.9 42.4 0.4439 11.1 TRIG_00741965
------------------------------------------
Foreground time interval of the image:
-0.920 6.080 (delta_t = 7.000 [sec])
Background time interval of the image:
-239.696 -235.766 (delta_t = 3.930 [sec])
-234.696 -74.256 (delta_t = 160.440 [sec])
-67.696 -0.920 (delta_t = 66.776 [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 -0.920 sec. to 6.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37200 ( -0.328823 0.32164 )
Norm@50keV : 3.68804E-03 ( -0.000615833 0.000612518 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.59 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.531864e-01
Photon flux (15-150 keV) in 7 sec: 0.446357 ( -0.0760708 0.0763042 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.50931e-07 ( -4.70374e-08 4.76608e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.920 sec. to 6.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50839 ( -1.13011 0.139847 )
Epeak [keV] : 166.893 ( )
Norm@50keV : 9.12231E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.06 using 59 PHA bins.
# Reduced chi-squared = 0.9832 for 56 degrees of freedom
# Null hypothesis probability = 5.105535e-01
Photon flux (15-150 keV) in 7 sec: 0.448745 0.446227 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49948e-07 ( -4.57471e-08 4.53831e-08 ) ergs/cm2
Band function
Time interval is from -0.920 sec. to 6.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.73041 ( 1.03705 1.03705 )
beta : -1.38940 ( 1.37446 0.330586 )
Epeak [keV] : 20.5831 ( -53.6053 -53.6053 )
Norm@50keV : 103.674 ( -103.643 344892 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.47 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 55 degrees of freedom
# Null hypothesis probability = 3.839878e-01
Photon flux (15-150 keV) in 7 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] : 14.1336 (-3.82957 8.8939)
R^2/D10^2 : 5.86699E-02 (-0.0574224 0.120825)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.54 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 57 degrees of freedom
# Null hypothesis probability = 3.653129e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.731e-08 6.643e-09
25- 50 6.500e-08 1.977e-08
50-150 8.591e-08 3.578e-08
15-150 1.682e-07 5.533e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-77.6879 -200)
Norm : 1.83214 (-0.30577 0.30577)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.15 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 57 degrees of freedom
# Null hypothesis probability = 3.623342e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.194e-08 1.853e-08
25- 50 6.144e-08 3.424e-08
50-150 1.347e-07 7.690e-08
15-150 2.281e-07 1.282e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.76639 (-2.25241 2.62998)
R1^2/D10^2 : 0.400938 (-0.228715 0.500514)
kT2 [keV] : 73.4558 (-62.0226 -98.9114)
R2^2/D10^2 : 4.19813E-04 (-0.000191033 0.00203618)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.95 using 59 PHA bins.
# Reduced chi-squared = 0.9627 for 55 degrees of freedom
# Null hypothesis probability = 5.534299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.118e-08 1.894e-08
25- 50 5.951e-08 3.225e-08
50-150 1.747e-07 9.684e-08
15-150 2.654e-07 1.441e-07
Peak spectrum fit
Power-law model
Time interval is from 1.732 sec. to 2.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17895 ( -0.449873 0.430092 )
Norm@50keV : 7.16674E-03 ( -0.0016657 0.00166398 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.43 using 59 PHA bins.
# Reduced chi-squared = 0.8146 for 57 degrees of freedom
# Null hypothesis probability = 8.401669e-01
Photon flux (15-150 keV) in 1 sec: 0.838819 ( -0.202956 0.203916 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.31484e-08 ( -1.85807e-08 1.87842e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.732 sec. to 2.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17802 ( -0.45656 0.429997 )
Epeak [keV] : 9999.19 ( -9999.36 -9999.36 )
Norm@50keV : 7.20221E-03 ( -0.00166911 0.00190181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.44 using 59 PHA bins.
# Reduced chi-squared = 0.8292 for 56 degrees of freedom
# Null hypothesis probability = 8.151081e-01
Photon flux (15-150 keV) in 1 sec: 0.841400 ( -0.205947 0.20128 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.32287e-08 ( -1.86057e-08 1.85265e-08 ) ergs/cm2
Band function
Time interval is from 1.732 sec. to 2.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.911609 ( 0.908356 0.908356 )
beta : -1.17936 ( 1.17926 0.450184 )
Epeak [keV] : 66.3516 ( -68.2077 -68.2077 )
Norm@50keV : 1.26421E-02 ( -0.00711784 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.43 using 59 PHA bins.
# Reduced chi-squared = 0.8442 for 55 degrees of freedom
# Null hypothesis probability = 7.879458e-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] : 19.9185 (-6.26243 10.998)
R^2/D10^2 : 3.80939E-02 (-0.0281886 0.093606)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9219 for 57 degrees of freedom
# Null hypothesis probability = 6.426935e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.918e-09 1.749e-09
25- 50 1.450e-08 7.008e-09
50-150 4.261e-08 2.137e-08
15-150 6.003e-08 2.774e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-86.8021 -200)
Norm : 3.48312 (-0.828923 0.828923)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.98 using 59 PHA bins.
# Reduced chi-squared = 0.8594 for 57 degrees of freedom
# Null hypothesis probability = 7.660217e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.673e-09 5.220e-09
25- 50 1.669e-08 9.745e-09
50-150 3.659e-08 2.170e-08
15-150 6.195e-08 3.609e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.91661 (-7.41463 7.66383)
R1^2/D10^2 : 0.275662 (-0.221544 0.454936)
kT2 [keV] : 64.2007 (-66.2297 -68.8162)
R2^2/D10^2 : 1.06640E-03 (-0.000655964 0.0350752)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.72 using 59 PHA bins.
# Reduced chi-squared = 0.8495 for 55 degrees of freedom
# Null hypothesis probability = 7.788657e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.897e-09 3.698e-09
25- 50 1.651e-08 9.520e-09
50-150 5.199e-08 2.726e-08
15-150 7.439e-08 3.682e-08
Plot creation:
Sun Mar 12 13:52:11 EDT 2017