batgrbproduct Analysis for Trigger=648601
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 Jul 12 20:42:34 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger648601/GCN5_download_cron
======================================================================
Trigger: 00648601 Segment: 000
BAT Trigger Time: 458331798.528 [s; MET]
Trigger Stop: 458331799.552 [s; MET]
UTC: 2015-07-11T18:23:03.688560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 221.630798971157 Dec: -35.4711122907382 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.97
Image Trigger?: NO
Rate S/N Ratio: 11.5758369027902 [ if not an image trigger ]
Image S/N Ratio: 7.97
Flight Position: [ source = BAT ]
RA: 221.630798971157 Dec: -35.4711122907382 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 221.623657006846 Dec: -35.4639838466694 [deg; J2000]
{ 14h 46m 29.7s , -35d 27' 50.3" }
+/- 0.992156531838041 [arcmin] (estimated 90% radius based on SNR)
+/- 0.434863780609483 [arcmin] (formal 1-sigma fit error)
SNR: 30.761238323197
Angular difference between Flight and Ground position is 0.552030 arcmin
Partial Coding Fraction: 0.328125 [ including projection effects ]
Duration
T90: 71.0039999485016 +/- 14.1552811438769
Measured from: -27.959999859333
to: 43.0440000891685 [s; relative to TRIGTIME]
T50: 14.5759999752045 +/- 3.47929933311532
Measured from: -4.12399989366531
to: 10.4520000815392 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.98000001907349
to: 2.98000001907349 [s; relative to TRIGTIME]
Total Fluence
Measured from: -34.0600000023842
to: 70.2360000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.864944 2.639546 1.743092 0.422608
0.109267 0.101345 0.085064 0.070767 [error]
Peak 0.100896 0.145789 0.118821 0.046826
0.013451 0.013308 0.012265 0.008961 [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 7.84e-07 1.21e-06 1.40e-06 3.11e-06 4.31e-06 6.50e-06 erg/cm2
Error 6.48e-08 5.97e-08 8.68e-08 4.16e-07 2.09e-07 4.79e-07 erg/cm2
Peak flux Power-law 1.27e+00 1.25e+00 8.63e-01 9.37e-01 3.76e+00 4.33e+00 ph/cm2/s
Error 2.26e-01 1.34e-01 1.01e-01 2.30e-01 3.81e-01 4.11e-01 ph/cm2/s
Fluence Cutoff-PL 7.41e-07 1.24e-06 1.43e-06 2.05e-06 4.23e-06 5.46e-06 erg/cm2
Error 7.92e-08 6.98e-08 9.42e-08 9.44e-07 2.31e-07 8.78e-07 erg/cm2
Peak flux Cutoff-PL 1.29e+00 1.26e+00 8.57e-01 9.12e-01 3.77e+00 4.33e+00 ph/cm2/s
Error 2.29e-01 1.33e-01 1.01e-01 2.25e-01 3.82e-01 4.10e-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 1.789 0.085 - - 4.49e-03 2.14e-04 70.240 57
CPL 1.488 0.341 86.6 -31.7 6.32e-03 2.48e-03 67.840 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.538 0.171 - - 2.98e-02 2.86e-03 45.640 57
CPL 1.541 0.172 9999.3 0.0 2.99e-02 2.27e-02 45.650 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: 55.360000 sec.
T50 in the 50-300 keV band: 9.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 104.296 -34.060 70.236
T90 71.004 -27.960 43.044
T50 14.576 -4.124 10.452
Peak 1.000 1.980 2.980
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
221.6237 -35.4640 0.0063 46.9 -161.3 5.2409 30.8 TRIG_00648601
------------------------------------------
Foreground time interval of the image:
-34.060 11.273 (delta_t = 45.333 [sec])
Background time interval of the image:
-239.528 -34.060 (delta_t = 205.468 [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 -34.060 sec. to 70.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78869 ( -0.0843569 0.0850752 )
Norm@50keV : 4.48636E-03 ( -0.000214139 0.000213594 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.24 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 57 degrees of freedom
# Null hypothesis probability = 1.118188e-01
Photon flux (15-150 keV) in 104.3 sec: 0.615523 ( -0.0312643 0.0313882 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.3096e-06 ( -2.0918e-07 2.09596e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -34.060 sec. to 70.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48830 ( -0.355165 0.32683 )
Epeak [keV] : 86.5877 ( -23.1185 -86.588 )
Norm@50keV : 6.31833E-03 ( -0.00189946 0.0030702 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.84 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 56 degrees of freedom
# Null hypothesis probability = 1.334537e-01
Photon flux (15-150 keV) in 104.3 sec: 0.603865 ( -0.033534 0.033676 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.22572e-06 ( -2.31317e-07 2.29742e-07 ) ergs/cm2
Band function
Time interval is from -34.060 sec. to 70.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -5.38496E-02 ( -3.11567 -0.618425 )
beta : -1.89614 ( -2.1887 0.123615 )
Epeak [keV] : 35.6630 ( -9.05497 117.901 )
Norm@50keV : 5.99774E-02 ( -0.0602709 189.455 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.82 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 55 degrees of freedom
# Null hypothesis probability = 1.507223e-01
Photon flux (15-150 keV) in 104.3 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] : 13.5791 ( )
R^2/D10^2 : 9.06064E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 178.21 using 59 PHA bins.
# Reduced chi-squared = 3.1265 for 57 degrees of freedom
# Null hypothesis probability = 2.106245e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.690e-07 3.520e-08
25- 50 1.331e-06 7.927e-08
50-150 1.590e-06 1.533e-07
15-150 3.289e-06 1.752e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 121.687 (-23.3513 24.6274)
Norm : 2.54528 (-0.156679 0.212527)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.82 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 57 degrees of freedom
# Null hypothesis probability = 1.356628e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.911e-07 5.846e-08
25- 50 1.239e-06 7.457e-08
50-150 2.227e-06 5.982e-07
15-150 4.157e-06 6.305e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.03690 (-0.933988 1.01884)
R1^2/D10^2 : 0.717865 (-0.267303 0.481867)
kT2 [keV] : 25.0330 (-3.59698 5.4508)
R2^2/D10^2 : 6.99453E-03 (-0.00364006 0.00588053)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.92 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 55 degrees of freedom
# Null hypothesis probability = 1.300885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.782e-07 1.097e-07
25- 50 1.279e-06 1.464e-07
50-150 2.233e-06 4.401e-07
15-150 4.190e-06 5.465e-07
Peak spectrum fit
Power-law model
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53780 ( -0.170349 0.17196 )
Norm@50keV : 2.98337E-02 ( -0.00285881 0.00285272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.64 using 59 PHA bins.
# Reduced chi-squared = 0.8007 for 57 degrees of freedom
# Null hypothesis probability = 8.601024e-01
Photon flux (15-150 keV) in 1 sec: 3.76357 ( -0.380311 0.381589 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.81355e-07 ( -2.87016e-08 2.88007e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54112 ( -0.176534 0.167837 )
Epeak [keV] : 9999.32 ( -9999.36 -9999.36 )
Norm@50keV : 2.99000E-02 ( -0.0299035 0.0154301 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.65 using 59 PHA bins.
# Reduced chi-squared = 0.8152 for 56 degrees of freedom
# Null hypothesis probability = 8.367771e-01
Photon flux (15-150 keV) in 1 sec: 3.77482 ( -0.39368 0.37034 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.80137e-07 ( -2.7559e-08 2.9732e-08 ) ergs/cm2
Band function
Time interval is from 1.980 sec. to 2.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.74319 ( -4.74319 -4.74319 )
beta : -1.56994 ( -0.189263 0.180517 )
Epeak [keV] : 21.9657 ( -21.9657 7.32645 )
Norm@50keV : 4518.61 ( -428.23 1.68736e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.33 using 59 PHA bins.
# Reduced chi-squared = 0.8242 for 55 degrees of freedom
# Null hypothesis probability = 8.205453e-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] : 15.9783 (-2.25835 2.65061)
R^2/D10^2 : 0.328375 (-0.136097 0.23328)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.46 using 59 PHA bins.
# Reduced chi-squared = 1.570 for 57 degrees of freedom
# Null hypothesis probability = 3.887292e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.734e-08 3.310e-09
25- 50 7.288e-08 1.038e-08
50-150 1.300e-07 2.422e-08
15-150 2.202e-07 2.785e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 15.3446 (-1.46067 1.46057)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.91 using 59 PHA bins.
# Reduced chi-squared = 0.8404 for 57 degrees of freedom
# Null hypothesis probability = 7.991176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.822e-08 5.215e-09
25- 50 7.351e-08 1.946e-08
50-150 1.612e-07 7.939e-08
15-150 2.730e-07 8.570e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.13456 (-1.54621 1.94277)
R1^2/D10^2 : 4.32416 (-2.47788 6.55592)
kT2 [keV] : 35.0603 (-9.28152 24.1412)
R2^2/D10^2 : 1.83016E-02 (-0.0140927 0.0330057)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.12 using 59 PHA bins.
# Reduced chi-squared = 0.8023 for 55 degrees of freedom
# Null hypothesis probability = 8.530783e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.923e-08 1.489e-08
25- 50 7.203e-08 2.264e-08
50-150 1.764e-07 8.752e-08
15-150 2.877e-07 1.032e-07
Plot creation:
Sun Jul 12 20:46:46 EDT 2015