batgrbproduct Analysis for Trigger=501095
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 Aug 21 04:42:54 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger501095/GCN5_download_cron
======================================================================
Trigger: 00501095 Segment: 000
BAT Trigger Time: 335554715.072 [s; MET]
Trigger Stop: 335554717.12 [s; MET]
UTC: 2011-08-20T17:38:27.791540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 343.335365253431 Dec: 70.3055248184936 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: NO
Rate S/N Ratio: 12.5299640861417 [ if not an image trigger ]
Image S/N Ratio: 8.09
Flight Position: [ source = BAT ]
RA: 343.335365253431 Dec: 70.3055248184936 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 343.209443282197 Dec: 70.307166691821 [deg; J2000]
{ 22h 52m 50.3s , +70d 18' 25.8" }
+/- 1.84359252195938 [arcmin] (estimated 90% radius based on SNR)
+/- 0.644902120001282 [arcmin] (formal 1-sigma fit error)
SNR: 12.6939575073301
Angular difference between Flight and Ground position is 2.547979 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 258.287999927998 +/- 8.74726584150895
Measured from: -1.58799988031387
to: 256.700000047684 [s; relative to TRIGTIME]
T50: 243.671999931335 +/- 199.752087119005
Measured from: 4.16400009393692
to: 247.836000025272 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.55599999427795
to: 2.55599999427795 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.07200002670288
to: 270.29599994421 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.644507 0.565379 0.369095 -0.002418
0.075524 0.077141 0.068015 0.059901 [error]
Peak 0.025113 0.028671 0.009215 0.005480
0.004799 0.004961 0.004386 0.003624 [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 1.77e-07 2.43e-07 2.47e-07 4.58e-07 8.14e-07 1.13e-06 erg/cm2
Error 3.42e-08 3.39e-08 6.49e-08 2.40e-07 1.45e-07 3.11e-07 erg/cm2
Peak flux Power-law 2.28e-01 1.72e-01 8.70e-02 6.28e-02 5.17e-01 5.50e-01 ph/cm2/s
Error 6.43e-02 3.74e-02 3.30e-02 4.51e-02 1.10e-01 1.22e-01 ph/cm2/s
Fluence Cutoff-PL 1.77e-07 2.44e-07 2.47e-07 4.53e-07 8.12e-07 1.11e-06 erg/cm2
Error 3.40e-08 3.67e-08 6.48e-08 3.65e-07 1.49e-07 3.76e-07 erg/cm2
Peak flux Cutoff-PL 2.19e-01 1.96e-01 7.29e-02 1.03e-02 4.97e-01 4.98e-01 ph/cm2/s
Error 7.13e-02 6.29e-02 5.92e-02 5.39e-02 1.17e-01 1.01e-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 4.63e-01 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 1.976 0.284 - - 3.25e-04 6.08e-05 60.930 57
CPL 1.977 0.952 9999.1 0.0 3.25e-04 5.13e-04 60.930 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.987 0.407 - - 3.46e-03 1.00e-03 55.820 57
CPL 0.880 3.097 36.1 0.0 1.76e-02 0.00e+00 55.150 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: 5.184000 sec.
T50 in the 50-300 keV band: 2.816000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 273.368 -3.072 270.296
T90 258.288 -1.588 256.700
T50 243.672 4.164 247.836
Peak 1.000 1.556 2.556
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
343.2094 +70.3072 0.0151 11.5 -117.9 0.6500 12.7 TRIG_00501095
------------------------------------------
Foreground time interval of the image:
-3.072 27.429 (delta_t = 30.501 [sec])
Background time interval of the image:
-239.072 -3.072 (delta_t = 236.000 [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
-3.072000 176.338000
177.928000 270.296000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97638 ( -0.271527 0.296995 )
Norm@50keV : 3.25209E-04 ( -6.21143e-05 5.94892e-05 )
------------------------------------------------------------
# Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.365191e-01
Photon flux (15-150 keV) in 271.8 sec: 4.82590E-02 ( -0.00655507 0.0065551 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.14223e-07 ( -1.42637e-07 1.47994e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-3.072000 176.338000
177.928000 270.296000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97695 ( -0.912872 0.991702 )
Epeak [keV] : 9999.11 ( )
Norm@50keV : 3.25173E-04 ( -0.000325178 0.000700664 )
------------------------------------------------------------
# Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 56 degrees of freedom
# Null hypothesis probability = 3.031597e-01
Photon flux (15-150 keV) in 271.8 sec: 4.82365E-02 ( -0.006548 0.0065581 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.11638e-07 ( -1.48338e-07 1.50463e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-3.072000 176.338000
177.928000 270.296000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.69955 ( 2.69955 2.69955 )
beta : -1.97635 ( -0.297021 0.271593 )
Epeak [keV] : 55.7571 ( -55.7571 -55.7571 )
Norm@50keV : 4.42010E-02 ( -0.00844275 0.00808491 )
------------------------------------------------------------
# Chi-Squared = 60.93 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Null hypothesis probability = 2.711831e-01
Photon flux (15-150 keV) in 271.8 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] : 9.86640 (-1.91293 2.45674)
R^2/D10^2 : 2.26493E-02 (-0.0223428 0.0284784)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 81.00 using 59 PHA bins.
# Reduced chi-squared = 1.421 for 57 degrees of freedom
# Null hypothesis probability = 2.003029e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.215e-07 3.165e-08
25- 50 2.963e-07 6.122e-08
50-150 1.487e-07 5.433e-08
15-150 5.665e-07 1.260e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 74.1559 (-28.6132 63.7252)
Norm : 0.230507 (-0.0457265 0.0616886)
------------------------------------------------------------
# Chi-Squared = 62.65 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 57 degrees of freedom
# Null hypothesis probability = 2.827701e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.616e-07 3.084e-08
25- 50 2.611e-07 4.569e-08
50-150 3.498e-07 2.099e-07
15-150 7.725e-07 2.229e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.06986 (-1.24978 1.68748)
R1^2/D10^2 : 0.574210 (-0.4438 3.12367)
kT2 [keV] : 18.6860 (-4.96427 8.25208)
R2^2/D10^2 : 1.74824E-03 (-0.00128553 0.00382613)
------------------------------------------------------------
# Chi-Squared = 59.30 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 55 degrees of freedom
# Null hypothesis probability = 3.217490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.871e-07 1.023e-07
25- 50 2.144e-07 9.741e-08
50-150 3.995e-07 2.294e-07
15-150 8.010e-07 3.401e-07
Peak spectrum fit
Power-law model
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98744 ( -0.382314 0.43122 )
Norm@50keV : 3.46493E-03 ( -0.00102228 0.000984991 )
------------------------------------------------------------
# Chi-Squared = 55.82 using 59 PHA bins.
# Reduced chi-squared = 0.9793 for 57 degrees of freedom
# Null hypothesis probability = 5.194739e-01
Photon flux (15-150 keV) in 1 sec: 0.516760 ( -0.109833 0.109877 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19323e-08 ( -8.55806e-09 9.0907e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.880332 ( -4.93427 1.2599 )
Epeak [keV] : 36.1324 ( )
Norm@50keV : 1.76057E-02 ( )
------------------------------------------------------------
# Chi-Squared = 55.15 using 59 PHA bins.
# Reduced chi-squared = 0.9849 for 56 degrees of freedom
# Null hypothesis probability = 5.068652e-01
Photon flux (15-150 keV) in 1 sec: 0.497084 ( -0.116848 0.117913 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71097e-08 ( -9.0602e-09 1.2696e-08 ) ergs/cm2
Band function
Time interval is from 1.556 sec. to 2.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.886703 ( 1.86659 2.16943 )
beta : -10.00000 ( 1.05329e+15 1.05329e+15 )
Epeak [keV] : 36.1442 ( -31.2838 -35.9924 )
Norm@50keV : 1.74333E-02 ( -0.0190041 36.7441 )
------------------------------------------------------------
# Chi-Squared = 55.15 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 55 degrees of freedom
# Null hypothesis probability = 4.687821e-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] : 8.48502 (-1.64646 2.125)
R^2/D10^2 : 0.468098 (-0.273268 0.612946)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.95 using 59 PHA bins.
# Reduced chi-squared = 0.9816 for 57 degrees of freedom
# Null hypothesis probability = 5.145588e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.344e-09 2.433e-09
25- 50 1.227e-08 4.787e-09
50-150 3.895e-09 2.444e-09
15-150 2.251e-08 9.714e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.2256 (-27.2841 83.4463)
Norm : 2.76458 (-0.836959 1.29801)
------------------------------------------------------------
# Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 0.9684 for 57 degrees of freedom
# Null hypothesis probability = 5.428434e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.913e-09 2.677e-09
25- 50 1.042e-08 4.054e-09
50-150 1.157e-08 7.898e-09
15-150 2.890e-08 1.196e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.58303 (-5.72575 2.18591)
R1^2/D10^2 : 0.662334 (-0.398407 1.58517)
kT2 [keV] : 50.7568 (-53.9058 -53.9059)
R2^2/D10^2 : 4.19726E-04 (-0.000376667 0.426423)
------------------------------------------------------------
# Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9663 for 55 degrees of freedom
# Null hypothesis probability = 5.457524e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.716e-09 3.699e-09
25- 50 1.135e-08 6.557e-09
50-150 1.280e-08 8.080e-09
15-150 3.086e-08 1.498e-08
Plot creation:
Sun Aug 21 05:03:10 EDT 2011