batgrbproduct Analysis for Trigger=623158
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 Jan 2 15:52:59 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger623158/batgroup_hand_proc
======================================================================
Trigger: 00623158 Segment: 000
BAT Trigger Time: 441786546.692 [s; MET]
Trigger Stop: 441786546.756 [s; MET]
UTC: 2015-01-01T06:28:53.699400 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 312.631006525829 Dec: 36.727689408524 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.46
Image Trigger?: NO
Rate S/N Ratio: 19.4422220952236 [ if not an image trigger ]
Image S/N Ratio: 7.46
Flight Position: [ source = BAT ]
RA: 312.631006525829 Dec: 36.727689408524 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 312.598527825013 Dec: 36.6688263563512 [deg; J2000]
{ 20h 50m 23.6s , +36d 40' 07.8" }
+/- 2.4795073189542 [arcmin] (estimated 90% radius based on SNR)
+/- 1.57888992092569 [arcmin] (formal 1-sigma fit error)
SNR: 8.31264521014016
Angular difference between Flight and Ground position is 3.861970 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 0.059999942779541 +/- 0.0144221847352656
Measured from: 0.00400012731552124
to: 0.0640000700950623 [s; relative to TRIGTIME]
T50: 0.031999945640564 +/- 0.0200000405311584
Measured from: 0.020000159740448
to: 0.052000105381012 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.46399998664856
to: 0.53600001335144 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0680000185966492 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.008859 0.015623 0.013816 0.001131
0.002283 0.002669 0.002776 0.002059 [error]
Peak -0.001793 0.024743 0.012229 0.009154
0.006914 0.007027 0.006066 0.005422 [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 2.32e-09 4.93e-09 8.23e-09 3.13e-08 2.27e-08 4.68e-08 erg/cm2
Error 7.62e-10 1.08e-09 2.05e-09 1.57e-08 5.24e-09 1.74e-08 erg/cm2
Peak flux Power-law 5.96e-02 9.15e-02 1.05e-01 2.32e-01 3.25e-01 4.89e-01 ph/cm2/s
Error 6.47e-02 5.70e-02 4.58e-02 2.94e-01 1.49e-01 2.53e-01 ph/cm2/s
Fluence Cutoff-PL 1.76e-09 5.70e-09 9.81e-09 8.49e-09 2.24e-08 2.58e-08 erg/cm2
Error 9.23e-10 1.42e-09 2.77e-09 1.59e-08 5.41e-09 1.52e-08 erg/cm2
Peak flux Cutoff-PL 4.98e-02 1.04e-01 1.16e-01 7.07e-02 3.15e-01 3.35e-01 ph/cm2/s
Error 6.33e-02 1.12e-01 7.32e-02 -------- 2.35e-01 3.11e-01 ph/cm2/s
Fluence Band 1.83e-09 5.54e-09 9.68e-09 1.08e-08 2.29e-08 2.81e-08 erg/cm2
Error 1.34e-09 -------- -------- -------- -------- -------- 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 1.260 0.309 - - 3.34e-02 6.98e-03 51.050 57
CPL -0.131 1.703 84.7 416.9 1.52e-01 6.21e-01 48.120 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 0.797 0.871 - - 2.83e-03 2.07e-03 68.340 57
CPL 3.791 0.000 238.2 66.5 1.85e-14 -3.37e+03 68.000 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 0.068 0.000 0.068
T90 0.060 0.004 0.064
T50 0.032 0.020 0.052
Peak 1.000 -0.464 0.536
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
312.5985 36.6688 0.0231 13.9419 -104.5558 0.0428160 8.313 TRIG_00623158
Foreground time interval of the image:
0.000 0.068 (delta_t = 0.068 [sec])
Background time interval of the image:
-126.591 0.000 (delta_t = 126.591 [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 0.000 sec. to 0.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25966 ( -0.304507 0.312973 )
Norm@50keV : 3.33772E-02 ( -0.00698725 0.00696971 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.05 using 59 PHA bins.
# Reduced chi-squared = 0.8957 for 57 degrees of freedom
# Null hypothesis probability = 6.965444e-01
Photon flux (15-150 keV) in 0.068 sec: 3.95391 ( -0.827017 0.827504 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26571e-08 ( -5.21976e-09 5.26215e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.131044 ( -2.0251 1.38077 )
Epeak [keV] : 84.6676 ( -24.2727 809.47 )
Norm@50keV : 0.152089 ( -0.152091 1.08994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.12 using 59 PHA bins.
# Reduced chi-squared = 0.8593 for 56 degrees of freedom
# Null hypothesis probability = 7.638749e-01
Photon flux (15-150 keV) in 0.068 sec: 3.92600 ( -0.83391 0.83193 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.23976e-08 ( -5.39111e-09 5.42375e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.131097 ( -1.06705 4.3814 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 84.6515 ( -21.5046 193.724 )
Norm@50keV : 0.152120 ( -0.15212 1.08661 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.12 using 59 PHA bins.
# Reduced chi-squared = 0.8749 for 55 degrees of freedom
# Null hypothesis probability = 7.327502e-01
Photon flux (15-150 keV) in 0.068 sec: 3.96292 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.28602e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.2288 (-3.56522 4.52064)
R^2/D10^2 : 0.276437 (-0.146635 0.28714)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.42 using 59 PHA bins.
# Reduced chi-squared = 0.8671 for 57 degrees of freedom
# Null hypothesis probability = 7.519077e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.245e-09 4.864e-10
25- 50 5.814e-09 2.061e-09
50-150 1.407e-08 5.221e-09
15-150 2.113e-08 6.552e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 16.1190 (-3.41196 3.40844)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.53 using 59 PHA bins.
# Reduced chi-squared = 0.9216 for 57 degrees of freedom
# Null hypothesis probability = 6.431967e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.745e-09 1.639e-09
25- 50 5.281e-09 3.079e-09
50-150 1.158e-08 6.790e-09
15-150 1.961e-08 1.160e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.48379 (-3.47775 -3.47775)
R1^2/D10^2 : 29.5912 (-29.7491 1.18242e+07)
kT2 [keV] : 19.8890 (-4.38091 -19.8871)
R2^2/D10^2 : 0.196055 (-0.196127 0.146862)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.74 using 59 PHA bins.
# Reduced chi-squared = 0.8679 for 55 degrees of freedom
# Null hypothesis probability = 7.457916e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.918e-09 8.320e-10
25- 50 5.271e-09 2.544e-09
50-150 1.482e-08 9.058e-09
15-150 2.201e-08 1.190e-08
Peak spectrum fit
Power-law model
Time interval is from -0.464 sec. to 0.536 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.797022 ( -1.01693 0.724131 )
Norm@50keV : 2.82860E-03 ( -0.00282863 0.0013118 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.34 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.443979e-01
Photon flux (15-150 keV) in 1 sec: 0.325136 ( -0.147278 0.151605 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.30958e-08 ( -1.45961e-08 1.48498e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.464 sec. to 0.536 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.79137 ( )
Epeak [keV] : 238.208 ( -238.208 -105.28 )
Norm@50keV : 1.84796E-14 ( 6737.89 -1.84796e-14 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.00 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 56 degrees of freedom
# Null hypothesis probability = 1.306236e-01
Photon flux (15-150 keV) in 1 sec: 0.315068 ( -0.315068 0.155739 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.01632e-08 ( -3.01632e-08 1.72733e-08 ) ergs/cm2
Band function
Time interval is from -0.464 sec. to 0.536 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93764 ( -4.93764 -4.93764 )
beta : -1.83361 ( 1.83361 1.55636 )
Epeak [keV] : 51.8422 ( -51.8422 23.1694 )
Norm@50keV : 3.47739 ( -1.40699 647050 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.56 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 55 degrees of freedom
# Null hypothesis probability = 1.365157e-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] : 19.2102 (-7.48823 34.2819)
R^2/D10^2 : 1.89327E-02 (-0.0189232 0.080059)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.38 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.437158e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.368e-09 9.115e-10
25- 50 6.630e-09 4.173e-09
50-150 1.802e-08 1.280e-08
15-150 2.602e-08 1.761e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-121.142 -199.363)
Norm : 1.34518 (-0.636807 0.636807)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.02 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 57 degrees of freedom
# Null hypothesis probability = 1.003144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.350e-09 2.235e-09
25- 50 6.443e-09 4.204e-09
50-150 1.413e-08 9.345e-09
15-150 2.393e-08 1.545e-08
Double BB
R1^2/D10^2 : 4.89327E-02 ( )
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 6.45278E-05 (-6.45903e-05 0.0537483)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.38 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.66 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.64 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 55 degrees of freedom
# Reduced chi-squared = 1.212 for 55 degrees of freedom
# Reduced chi-squared = 1.212 for 55 degrees of freedom
# Null hypothesis probability = 1.061296e-01
# Null hypothesis probability = 1.348233e-01
# Null hypothesis probability = 1.350574e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Fri Jan 2 16:02:00 EST 2015