batgrbproduct Analysis for Trigger=631747
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): Fri Feb 20 13:01:51 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger631747/batgroup_hand_proc
======================================================================
Trigger: 00631747 Segment: 000
BAT Trigger Time: 446056956.928 [s; MET]
Trigger Stop: 446056957.44 [s; MET]
UTC: 2015-02-19T16:42:23.719980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 94.2997091618841 Dec: 9.1157816007906 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 13.51
Image Trigger?: NO
Rate S/N Ratio: 28.1247222208505 [ if not an image trigger ]
Image S/N Ratio: 13.51
Flight Position: [ source = BAT ]
RA: 94.2997091618841 Dec: 9.1157816007906 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 94.2854698100144 Dec: 9.13106378177477 [deg; J2000]
{ 06h 17m 08.5s , +09d 07' 51.8" }
+/- 1.54555014978778 [arcmin] (estimated 90% radius based on SNR)
+/- 0.561608290826642 [arcmin] (formal 1-sigma fit error)
SNR: 16.3305068251008
Angular difference between Flight and Ground position is 1.245931 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 3.26399999856949 +/- 0.603774809282987
Measured from: -1.33599996566772
to: 1.92800003290176 [s; relative to TRIGTIME]
T50: 1.02400004863739 +/- 0.320000004768374
Measured from: -0.0559999942779541
to: 0.968000054359436 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0759999752044678
to: 0.924000024795532 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.783999979496
to: 2.12000000476837 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.282466 0.034130 -0.007162 0.003645
0.012303 0.010258 0.008635 0.006895 [error]
Peak 0.149475 0.017542 -0.003869 -0.000106
0.007206 0.005373 0.004504 0.003602 [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 7.99e-08 1.40e-08 1.16e-09 1.05e-10 9.51e-08 9.51e-08 erg/cm2
Error 9.80e-09 4.20e-09 8.24e-10 1.49e-10 1.16e-08 1.16e-08 erg/cm2
Peak flux Power-law 1.45e+00 1.57e-01 7.07e-03 3.33e-04 1.61e+00 1.61e+00 ph/cm2/s
Error 1.87e-01 4.48e-02 4.79e-03 4.52e-04 1.99e-01 1.99e-01 ph/cm2/s
Fluence Cutoff-PL 8.16e-08 1.13e-08 1.67e-10 1.31e-13 9.30e-08 9.30e-08 erg/cm2
Error 1.05e-08 6.18e-09 9.80e-10 1.22e-10 1.12e-08 1.15e-08 erg/cm2
Peak flux Cutoff-PL 1.51e+00 1.09e-01 1.94e-04 1.07e-09 1.62e+00 1.62e+00 ph/cm2/s
Error 2.13e-01 9.29e-02 5.17e-03 3.06e-04 2.02e-01 2.02e-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 5.584 0.565 - - 2.91e-04 1.66e-04 42.910 57
CPL 1.778 0.000 1.2 0.0 4.67e-01 0.00e+00 42.160 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 5.472 0.555 - - 6.62e-04 3.70e-04 52.240 57
CPL 1.302 0.000 3.3 0.0 2.23e+00 0.00e+00 50.540 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 3.904 -1.784 2.120
T90 3.264 -1.336 1.928
T50 1.024 -0.056 0.968
Peak 1.000 -0.076 0.924
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
94.2855 9.1311 0.0117 0.0531 144.2309 0.3195207 16.331 TRIG_00631747
Foreground time interval of the image:
-1.784 2.120 (delta_t = 3.904 [sec])
Background time interval of the image:
-239.928 -1.784 (delta_t = 238.144 [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 -1.784 sec. to 2.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.58444 ( -0.546191 0.583037 )
Norm@50keV : 2.91331E-04 ( -0.000131207 0.000200375 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.91 using 59 PHA bins.
# Reduced chi-squared = 0.7527 for 57 degrees of freedom
# Null hypothesis probability = 9.168125e-01
Photon flux (15-150 keV) in 3.904 sec: 0.792808 ( -0.0946342 0.0946431 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.51022e-08 ( -1.1545e-08 1.15835e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.784 sec. to 2.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77800 ( )
Epeak [keV] : 1.16524 ( )
Norm@50keV : 0.467355 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.16 using 59 PHA bins.
# Reduced chi-squared = 0.7529 for 56 degrees of freedom
# Null hypothesis probability = 9.145771e-01
Photon flux (15-150 keV) in 3.904 sec: 0.790639 ( -0.095124 0.095045 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.30058e-08 ( -1.12146e-08 1.1112e-08 ) ergs/cm2
Band function
Time interval is from -1.784 sec. to 2.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20043 ( )
beta : -3.70558 ( )
Epeak [keV] : 58.8915 ( )
Norm@50keV : 4.05187E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 191.18 using 59 PHA bins.
# Reduced chi-squared = 3.4761 for 55 degrees of freedom
# Null hypothesis probability = 6.101954e-17
Photon flux (15-150 keV) in 3.904 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] : 2.57175 (-0.269248 0.32103)
R^2/D10^2 : 320.232 (-185.547 432.671)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.66 using 59 PHA bins.
# Reduced chi-squared = 0.7660 for 57 degrees of freedom
# Null hypothesis probability = 9.030454e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.402e-08 2.247e-08
25- 50 6.916e-09 2.757e-09
50-150 2.872e-12 2.780e-12
15-150 9.094e-08 2.834e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.79277 (-0.749891 0.981924)
Norm : 213.466 (-106.604 220.176)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.25 using 59 PHA bins.
# Reduced chi-squared = 0.7412 for 57 degrees of freedom
# Null hypothesis probability = 9.276949e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.268e-08 2.241e-08
25- 50 9.479e-09 3.482e-09
50-150 3.952e-11 3.553e-11
15-150 9.220e-08 2.542e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.77153E-04 ( )
R1^2/D10^2 : 2.58295E+05 (-258295 -258295)
kT2 [keV] : 2.57111 (-0.269125 0.321148)
R2^2/D10^2 : 320.848 (-185.544 432.549)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.64 using 59 PHA bins.
#Fit statistic : Chi-Squared = 43.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 55 degrees of freedom
# Reduced chi-squared = 0.7938 for 55 degrees of freedom
# Null hypothesis probability = 4.504301e-01
# Null hypothesis probability = 8.646165e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.044e-08 2.510e-03
25- 50 1.467e-08 2.122e-02
50-150 5.354e-11 5.276e-01
15-150 8.517e-08 5.067e-01
Peak spectrum fit
Power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.47159 ( -0.535272 0.574637 )
Norm@50keV : 6.62365E-04 ( -0.000296329 0.000444503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.24 using 59 PHA bins.
# Reduced chi-squared = 0.9166 for 57 degrees of freedom
# Null hypothesis probability = 6.537576e-01
Photon flux (15-150 keV) in 1 sec: 1.61321 ( -0.199444 0.19945 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.99163e-08 ( -6.32944e-09 6.35621e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30204 ( )
Epeak [keV] : 3.32260 ( )
Norm@50keV : 2.22843 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.54 using 59 PHA bins.
# Reduced chi-squared = 0.9025 for 56 degrees of freedom
# Null hypothesis probability = 6.808519e-01
Photon flux (15-150 keV) in 1 sec: 1.62089 ( -0.20192 0.20291 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84977e-08 ( -6.0213e-09 5.9709e-09 ) ergs/cm2
Band function
Time interval is from -0.076 sec. to 0.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.15235 ( 1.04 1.04 )
beta : -6.37678 ( 6.27883 1.08606 )
Epeak [keV] : 11.8692 ( -4.22238 1.44886 )
Norm@50keV : 1.60764E+05 ( -160371 4.64416e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.01 using 59 PHA bins.
# Reduced chi-squared = 0.8911 for 55 degrees of freedom
# Null hypothesis probability = 7.016239e-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] : 2.62012 (-0.267077 0.312119)
R^2/D10^2 : 577.864 (-321.902 725.129)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.87 using 59 PHA bins.
# Reduced chi-squared = 0.8924 for 57 degrees of freedom
# Null hypothesis probability = 7.030777e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.428e-08 1.245e-08
25- 50 3.920e-09 1.580e-09
50-150 1.941e-12 1.806e-12
15-150 4.820e-08 1.627e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.90687 (-0.754697 0.975935)
Norm : 401.481 (-193.99 387.601)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.52 using 59 PHA bins.
# Reduced chi-squared = 0.8864 for 57 degrees of freedom
# Null hypothesis probability = 7.150083e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.337e-08 1.218e-08
25- 50 5.251e-09 1.994e-09
50-150 2.473e-11 2.205e-11
15-150 4.864e-08 1.311e-08
Double BB
R1^2/D10^2 : 0.354032 ( )
kT2 [keV] : 2.42990 (-2.35206 0.623655)
R2^2/D10^2 : 926.434 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.54 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.37 using 59 PHA bins.
# Reduced chi-squared = 0.9007 for 55 degrees of freedom
# Reduced chi-squared = 0.9000 for 55 degrees of freedom
# Reduced chi-squared = 0.8976 for 55 degrees of freedom
# Null hypothesis probability = 6.826244e-01
# Null hypothesis probability = 6.838806e-01
# Null hypothesis probability = 6.887924e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.381e-08 2.412e-08
25- 50 6.193e-09 3.045e-09
50-150 2.070e-10 1.089e-10
15-150 5.021e-08 2.639e-08
Plot creation:
Fri Feb 20 13:36:58 EST 2015