batgrbproduct Analysis for Trigger=621915
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 Dec 21 01:28:24 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger621915/GCN5_download_cron
======================================================================
Trigger: 00621915 Segment: 000
BAT Trigger Time: 440748185.6 [s; MET]
Trigger Stop: 440748186.624 [s; MET]
UTC: 2014-12-20T06:02:52.659420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 195.049884054191 Dec: 32.1436131040692 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.59
Image Trigger?: NO
Rate S/N Ratio: 48.2078831727758 [ if not an image trigger ]
Image S/N Ratio: 15.59
Flight Position: [ source = BAT ]
RA: 195.049884054191 Dec: 32.1436131040692 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 195.057486936089 Dec: 32.1464859258063 [deg; J2000]
{ 13h 00m 13.8s , +32d 08' 47.3" }
+/- 1.1274257302194 [arcmin] (estimated 90% radius based on SNR)
+/- 0.360288982128627 [arcmin] (formal 1-sigma fit error)
SNR: 25.6275467312891
Angular difference between Flight and Ground position is 0.422960 arcmin
Partial Coding Fraction: 0.1972656 [ including projection effects ]
Duration
T90: 7.21599996089935 +/- 0.473776347689343
Measured from: -0.419999897480011
to: 6.79600006341934 [s; relative to TRIGTIME]
T50: 3.05999994277954 +/- 0.951100420580729
Measured from: 0.372000098228455
to: 3.432000041008 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.120000004768372
to: 0.879999995231628 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.90800005197525
to: 7.2960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.658881 1.196118 1.274317 0.423200
0.052683 0.059592 0.055790 0.041659 [error]
Peak 0.143587 0.349093 0.448024 0.175924
0.020687 0.026727 0.027403 0.019456 [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 2.79e-07 5.80e-07 9.45e-07 3.46e-06 2.61e-06 5.26e-06 erg/cm2
Error 2.73e-08 3.49e-08 5.25e-08 4.18e-07 1.35e-07 4.46e-07 erg/cm2
Peak flux Power-law 2.07e+00 2.71e+00 2.61e+00 4.47e+00 8.87e+00 1.19e+01 ph/cm2/s
Error 3.13e-01 2.61e-01 2.05e-01 7.07e-01 7.10e-01 9.25e-01 ph/cm2/s
Fluence Cutoff-PL 2.36e-07 6.08e-07 1.02e-06 1.67e-06 2.57e-06 3.53e-06 erg/cm2
Error 3.42e-08 3.97e-08 6.77e-08 6.14e-07 1.40e-07 6.09e-07 erg/cm2
Peak flux Cutoff-PL 1.68e+00 2.84e+00 2.91e+00 2.39e+00 8.73e+00 9.83e+00 ph/cm2/s
Error 3.83e-01 2.95e-01 2.86e-01 9.79e-01 7.16e-01 1.18e+00 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 1.297 0.083 - - 3.22e-02 1.63e-03 67.990 57
CPL 0.615 0.381 117.4 45.0 6.48e-02 2.55e-02 57.140 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.056 0.120 - - 7.68e-02 5.94e-03 84.750 57
CPL 0.266 0.560 129.6 82.1 1.71e-01 1.01e-01 77.800 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: 7.488000 sec.
T50 in the 50-300 keV band: 2.944000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.204 -0.908 7.296
T90 7.216 -0.420 6.796
T50 3.060 0.372 3.432
Peak 1.000 -0.120 0.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
195.0575 +32.1465 0.0075 50.8 -154.0 3.7092 25.6 TRIG_00621915
------------------------------------------
Foreground time interval of the image:
-0.908 7.296 (delta_t = 8.204 [sec])
Background time interval of the image:
-239.600 -0.908 (delta_t = 238.692 [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 -0.908 sec. to 7.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29696 ( -0.0831753 0.0824929 )
Norm@50keV : 3.21971E-02 ( -0.00162975 0.00162829 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.99 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 57 degrees of freedom
# Null hypothesis probability = 1.512693e-01
Photon flux (15-150 keV) in 8.204 sec: 3.83905 ( -0.209998 0.210596 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61217e-06 ( -1.35326e-07 1.35428e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.908 sec. to 7.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.615017 ( -0.397521 0.364791 )
Epeak [keV] : 117.365 ( -23.4003 66.6957 )
Norm@50keV : 6.48035E-02 ( -0.0197855 0.0311366 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.14 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.325158e-01
Photon flux (15-150 keV) in 8.204 sec: 3.73236 ( -0.21645 0.21747 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56539e-06 ( -1.40551e-07 1.39993e-07 ) ergs/cm2
Band function
Time interval is from -0.908 sec. to 7.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.362887 ( -0.571062 1.01287 )
beta : -1.70505 ( 1.7096 0.274232 )
Epeak [keV] : 92.0959 ( -35.1512 75.8193 )
Norm@50keV : 8.89033E-02 ( -0.0422592 0.265839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.45 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.205138e-01
Photon flux (15-150 keV) in 8.204 sec: 3.70541 ( 3.29459 -0.22112 ) 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] : 19.2151 (-1.10316 1.19229)
R^2/D10^2 : 0.202872 (-0.038356 0.046293)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.58 using 59 PHA bins.
# Reduced chi-squared = 1.8874 for 57 degrees of freedom
# Null hypothesis probability = 5.894670e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.203e-07 1.345e-08
25- 50 5.832e-07 4.295e-08
50-150 1.586e-06 1.272e-07
15-150 2.289e-06 1.317e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 16.4546 (-0.834538 0.834227)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.67 using 59 PHA bins.
# Reduced chi-squared = 1.626 for 57 degrees of freedom
# Null hypothesis probability = 1.972289e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.361e-07 1.944e-08
25- 50 6.465e-07 3.741e-08
50-150 1.418e-06 8.327e-08
15-150 2.401e-06 1.337e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.60595 (-2.67053 2.9556)
R1^2/D10^2 : 1.11780 (-0.541199 1.74807)
kT2 [keV] : 30.4630 (-6.00425 16.4225)
R2^2/D10^2 : 3.22089E-02 (-0.0249524 0.0437006)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.43 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 55 degrees of freedom
# Null hypothesis probability = 3.176097e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.078e-07 4.824e-08
25- 50 6.342e-07 1.276e-07
50-150 1.722e-06 6.483e-07
15-150 2.564e-06 7.810e-07
Peak spectrum fit
Power-law model
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05575 ( -0.121291 0.11873 )
Norm@50keV : 7.67771E-02 ( -0.00595092 0.00592924 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.75 using 59 PHA bins.
# Reduced chi-squared = 1.487 for 57 degrees of freedom
# Null hypothesis probability = 9.975059e-03
Photon flux (15-150 keV) in 1 sec: 8.87138 ( -0.708873 0.710603 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.14415e-07 ( -6.37525e-08 6.38315e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.266124 ( -0.595965 0.524313 )
Epeak [keV] : 129.608 ( -32.3582 131.772 )
Norm@50keV : 0.170973 ( -0.0692332 0.13342 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.80 using 59 PHA bins.
# Reduced chi-squared = 1.389 for 56 degrees of freedom
# Null hypothesis probability = 2.862203e-02
Photon flux (15-150 keV) in 1 sec: 8.72561 ( -0.71464 0.71651 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.05268e-07 ( -6.6221e-08 6.5782e-08 ) ergs/cm2
Band function
Time interval is from -0.120 sec. to 0.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.479552 ( -1.08646 -0.49698 )
beta : -1.43498 ( 1.43544 0.305643 )
Epeak [keV] : 78.0051 ( -36.6341 95.3053 )
Norm@50keV : 0.450077 ( -0.484746 199.292 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.96 using 59 PHA bins.
# Reduced chi-squared = 1.381 for 55 degrees of freedom
# Null hypothesis probability = 3.207082e-02
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] : 21.5622 (-1.90022 2.16395)
R^2/D10^2 : 0.350942 (-0.0949554 0.124787)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.02 using 59 PHA bins.
# Reduced chi-squared = 1.667 for 57 degrees of freedom
# Null hypothesis probability = 1.178036e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.047e-08 4.705e-09
25- 50 1.592e-07 1.940e-08
50-150 5.526e-07 6.420e-08
15-150 7.423e-07 6.955e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 37.2214 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 129.78 using 59 PHA bins.
# Reduced chi-squared = 2.2768 for 57 degrees of freedom
# Null hypothesis probability = 1.338155e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.268e-08 8.330e-09
25- 50 1.783e-07 2.510e-08
50-150 3.910e-07 1.075e-07
15-150 6.620e-07 1.613e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.5582 (-4.45143 4.44396)
R1^2/D10^2 : 1.20220 (-0.549237 1.4079)
kT2 [keV] : 42.0817 (-14.1462 -45.4002)
R2^2/D10^2 : 2.90870E-02 (-0.018576 0.111627)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.24 using 59 PHA bins.
# Reduced chi-squared = 1.386 for 55 degrees of freedom
# Null hypothesis probability = 3.053505e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.661e-08 1.700e-08
25- 50 1.776e-07 6.985e-08
50-150 5.806e-07 2.858e-07
15-150 8.048e-07 3.514e-07
Plot creation:
Sun Dec 21 01:32:15 EST 2014