batgrbproduct Analysis for Trigger=538290
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): Wed Nov 14 10:38:33 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger538290/GCN5_download_cron
======================================================================
Trigger: 00538290 Segment: 000
BAT Trigger Time: 374525242.368 [s; MET]
Trigger Stop: 374525244.416 [s; MET]
UTC: 2012-11-13T18:47:12.498220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 152.477975037096 Dec: -58.2868630066638 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.08
Image Trigger?: NO
Rate S/N Ratio: 5.8309518948453 [ if not an image trigger ]
Image S/N Ratio: 7.08
Flight Position: [ source = BAT ]
RA: 152.477975037096 Dec: -58.2868630066638 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 152.515580968409 Dec: -58.287929335227 [deg; J2000]
{ 10h 10m 03.7s , -58d 17' 16.5" }
+/- 3.7043326554308 [arcmin] (estimated 90% radius based on SNR)
+/- 3.02677143874174 [arcmin] (formal 1-sigma fit error)
SNR: 4.68463276069651
Angular difference between Flight and Ground position is 1.187798 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 838.12399995327 +/- 49.2002920140546
Measured from: -176.067999839783
to: 662.056000113487 [s; relative to TRIGTIME]
T50: 508.119999945164 +/- 41.8842273433721
Measured from: 45.6200001239777
to: 553.740000069141 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 569.840000033379
to: 570.840000033379 [s; relative to TRIGTIME]
Total Fluence
Measured from: -209.391999959946
to: 695.152000010014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.618035 7.003093 0.803472 -0.178372
0.179270 0.178965 0.152358 0.138965 [error]
Peak 0.045510 0.027537 0.006815 0.004567
0.006131 0.006237 0.005404 0.005225 [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 2.76e-06 2.41e-06 1.44e-06 1.30e-06 7.17e-06 7.91e-06 erg/cm2
Error 2.21e-07 1.73e-07 2.11e-07 3.49e-07 5.21e-07 6.91e-07 erg/cm2
Peak flux Power-law 3.87e-01 2.10e-01 7.14e-02 3.15e-02 6.85e-01 7.00e-01 ph/cm2/s
Error 8.99e-02 5.29e-02 3.73e-02 3.03e-02 1.39e-01 1.46e-01 ph/cm2/s
Fluence Cutoff-PL 2.41e-06 2.93e-06 6.40e-07 1.07e-08 5.99e-06 0.00e+00 erg/cm2
Error 2.59e-07 2.35e-07 2.35e-07 2.14e-08 4.56e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.87e-01 2.10e-01 7.12e-02 3.12e-02 6.85e-01 6.99e-01 ph/cm2/s
Error 8.96e-02 5.28e-02 3.72e-02 3.52e-02 1.48e-01 1.45e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.899 0.000 - - 6.99e-04 0.00e+00 136.490 57
CPL -0.224 0.719 24.3 2.5 6.52e-02 0.00e+00 44.240 56
The chi2 of BB fit is 53.95 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 2.557 0.499 - - 3.37e-03 1.34e-03 69.060 57
CPL 1.695 0.000 10.1 0.0 1.40e-02 0.00e+00 69.240 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 904.544 -209.392 695.152
T90 838.124 -176.068 662.056
T50 508.120 45.620 553.740
Peak 1.000 569.840 570.840
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
152.5156 -58.2879 0.0409 4.7 107.7 8.1239 4.7 TRIG_00538290
------------------------------------------
Foreground time interval of the image:
-209.392 -112.208 (delta_t = 97.184 [sec])
-111.368 640.033 (delta_t = 751.401 [sec])
Background time interval of the image:
-239.368 -209.392 (delta_t = 29.976 [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
Multiple GTIs in the spectrum
tstart tstop
-209.392000 -112.208000
-111.368000 695.152000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.89879 ( )
Norm@50keV : 6.99407E-04 ( )
------------------------------------------------------------
# Chi-Squared = 136.49 using 59 PHA bins.
# Reduced chi-squared = 2.3946 for 57 degrees of freedom
# Null hypothesis probability = 1.807228e-08
Photon flux (15-150 keV) in 903.7 sec: 0.168462 ( -0.0107656 0.0107723 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1653e-06 ( -5.16483e-07 5.25314e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-209.392000 -112.208000
-111.368000 695.152000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.224262 ( -0.759275 0.67785 )
Epeak [keV] : 24.3468 ( -2.83938 2.12071 )
Norm@50keV : 6.52248E-02 ( )
------------------------------------------------------------
# Chi-Squared = 44.24 using 59 PHA bins.
# Reduced chi-squared = 0.7901 for 56 degrees of freedom
# Null hypothesis probability = 8.719280e-01
Photon flux (15-150 keV) in 903.7 sec: 0.155132 ( -0.008465 0.008542 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.99142e-06 ( -4.45099e-07 4.66228e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-209.392000 -112.208000
-111.368000 695.152000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.213647 ( -0.659577 0.738516 )
beta : -9.37167 ( 10 19.9967 )
Epeak [keV] : 24.3341 ( -1.53384 2.14469 )
Norm@50keV : 6.43215E-02 ( -0.0396744 0.136049 )
------------------------------------------------------------
# Chi-Squared = 44.25 using 59 PHA bins.
# Reduced chi-squared = 0.8046 for 55 degrees of freedom
# Null hypothesis probability = 8.497535e-01
Photon flux (15-150 keV) in 903.7 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] : 6.97967 (-0.25771 0.266719)
R^2/D10^2 : 0.310178 (-0.0494669 0.0592735)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 53.95 using 59 PHA bins.
# Reduced chi-squared = 0.9465 for 57 degrees of freedom
# Null hypothesis probability = 5.903047e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.187e-06 1.369e-07
25- 50 2.978e-06 1.270e-07
50-150 4.884e-07 7.496e-08
15-150 5.654e-06 2.205e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.9086 (-1.67141 1.85234)
Norm : 1.79449 (-0.174665 0.195533)
------------------------------------------------------------
# Chi-Squared = 61.46 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.194730e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.797e-06 1.541e-07
25- 50 2.705e-06 1.134e-07
50-150 1.009e-06 1.440e-07
15-150 6.511e-06 2.698e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.53886 (-1.43714 1.71813)
R1^2/D10^2 : 2.05736 (-1.55953 36.0298)
kT2 [keV] : 7.77964 (-0.627404 1.30424)
R2^2/D10^2 : 0.165093 (-0.10944 0.102067)
------------------------------------------------------------
# Chi-Squared = 42.80 using 59 PHA bins.
# Reduced chi-squared = 0.7783 for 55 degrees of freedom
# Null hypothesis probability = 8.843614e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.502e-06 1.047e-06
25- 50 2.890e-06 8.648e-07
50-150 6.385e-07 2.158e-07
15-150 6.031e-06 1.741e-06
Peak spectrum fit
Power-law model
Time interval is from 569.840 sec. to 570.840 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55688 ( -0.45155 0.545453 )
Norm@50keV : 3.36702E-03 ( -0.0013187 0.0013667 )
------------------------------------------------------------
# Chi-Squared = 69.06 using 59 PHA bins.
# Reduced chi-squared = 1.212 for 57 degrees of freedom
# Null hypothesis probability = 1.314184e-01
Photon flux (15-150 keV) in 1 sec: 0.685179 ( -0.138809 0.139385 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.42106e-08 ( -9.32427e-09 1.03913e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 569.840 sec. to 570.840 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.69478 ( )
Epeak [keV] : 10.0638 ( )
Norm@50keV : 1.40452E-02 ( )
------------------------------------------------------------
# Chi-Squared = 69.24 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 56 degrees of freedom
# Null hypothesis probability = 1.101031e-01
Photon flux (15-150 keV) in 1 sec: 0.684696 ( -0.156754 0.139291 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90664e-08 ( -1.25515e-08 1.73083e-08 ) ergs/cm2
Band function
Time interval is from 569.840 sec. to 570.840 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.24271 ( 1.25661 1.25661 )
beta : -2.85964 ( 2.7772 0.633466 )
Epeak [keV] : 19.4844 ( -14.4056 12.7472 )
Norm@50keV : 23.8278 ( -24.2474 1954.22 )
------------------------------------------------------------
# Chi-Squared = 68.32 using 59 PHA bins.
# Reduced chi-squared = 1.242 for 55 degrees of freedom
# Null hypothesis probability = 1.071198e-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] : 5.99888 (-1.2418 1.48655)
R^2/D10^2 : 2.49711 (-1.51646 4.3354)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 70.87 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 57 degrees of freedom
# Null hypothesis probability = 1.024335e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.194e-08 5.037e-09
25- 50 1.190e-08 5.542e-09
50-150 1.089e-09 8.444e-10
15-150 2.492e-08 1.030e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.3060 (-9.37375 18.9267)
Norm : 6.63559 (-2.58209 4.92071)
------------------------------------------------------------
# Chi-Squared = 69.26 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 57 degrees of freedom
# Null hypothesis probability = 1.279426e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.193e-08 3.528e-09
25- 50 1.201e-08 4.318e-09
50-150 4.897e-09 3.768e-09
15-150 2.883e-08 1.052e-08
Double BB
R1^2/D10^2 : 3.31268 ( )
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 7.55232E-05 (-5.10133e-05 5.06507e-05)
------------------------------------------------------------
# Chi-Squared = 69.27 using 59 PHA bins.
# Chi-Squared = 65.39 using 59 PHA bins.
# Chi-Squared = 64.94 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 55 degrees of freedom
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Null hypothesis probability = 9.331593e-02
# Null hypothesis probability = 1.592990e-01
# Null hypothesis probability = 1.688719e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.224e-08 7.195e-09
25- 50 1.147e-08 6.610e-09
50-150 4.659e-09 3.462e-09
15-150 2.836e-08 1.441e-08
Plot creation:
Wed Nov 14 11:00:57 EST 2012