batgrbproduct Analysis for Trigger=518626
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): Mon Mar 26 13:13:25 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger518626/batgroup_hand_proc_good
======================================================================
Trigger: 00518626 Segment: 000
BAT Trigger Time: 354417637.312 [s; MET]
Trigger Stop: 354417637.824 [s; MET]
UTC: 2012-03-26T01:20:29.280140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.92454494837 Dec: 69.2780331370331 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: NO
Rate S/N Ratio: 10.1488915650922 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 273.92454494837 Dec: 69.2780331370331 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.905534084917 Dec: 69.2484455921614 [deg; J2000]
{ 18h 15m 37.3s , +69d 14' 54.4" }
+/- 0.835698967239911 [arcmin] (estimated 90% radius based on SNR)
+/- 0.240207893077141 [arcmin] (formal 1-sigma fit error)
SNR: 39.3075264234235
Angular difference between Flight and Ground position is 1.820615 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 69.6199999451637 +/- 8.3293170973786
Measured from: -55.067999958992
to: 14.5519999861717 [s; relative to TRIGTIME]
T50: 5.19199997186661 +/- 0.433626552206227
Measured from: 1.89600002765656
to: 7.08799999952316 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.58799999952316
to: 4.58799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: -67.8999999761581
to: 22.5640000104904 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.863893 1.978683 0.943081 0.117087
0.051027 0.050468 0.043490 0.036400 [error]
Peak 0.192799 0.232561 0.111106 0.015903
0.007761 0.008035 0.006563 0.004369 [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 5.90e-07 7.73e-07 7.43e-07 1.27e-06 2.53e-06 3.37e-06 erg/cm2
Error 3.55e-08 2.77e-08 4.33e-08 1.55e-07 9.78e-08 1.93e-07 erg/cm2
Peak flux Power-law 2.00e+00 1.55e+00 8.08e-01 6.09e-01 4.64e+00 4.97e+00 ph/cm2/s
Error 1.46e-01 7.15e-02 5.43e-02 8.05e-02 2.18e-01 2.25e-01 ph/cm2/s
Fluence Cutoff-PL 5.34e-07 8.15e-07 7.34e-07 4.94e-07 2.58e-06 0.00e+00 erg/cm2
Error 4.39e-08 3.47e-08 4.80e-08 2.19e-07 2.56e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.77e+00 1.67e+00 8.21e-01 2.47e-01 4.44e+00 4.51e+00 ph/cm2/s
Error 1.76e-01 9.22e-02 6.13e-02 1.05e-01 2.35e-01 2.61e-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 2.058 0.073 - - 3.02e-03 1.25e-04 68.410 57
CPL 1.409 0.338 41.1 6.9 6.69e-03 2.87e-03 55.800 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.940 0.084 - - 3.17e-02 1.62e-03 73.260 57
CPL 1.127 0.410 48.4 6.9 8.74e-02 4.76e-02 59.110 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: 12.096000 sec.
T50 in the 50-300 keV band: 3.648000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 90.464 -67.900 22.564
T90 69.620 -55.068 14.552
T50 5.192 1.896 7.088
Peak 1.000 3.588 4.588
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.9055 +69.2484 0.0049 15.3 -119.7 4.3454 39.3 TRIG_00518626
------------------------------------------
Foreground time interval of the image:
-67.900 10.989 (delta_t = 78.889 [sec])
Background time interval of the image:
-239.312 -67.900 (delta_t = 171.412 [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 -67.900 sec. to 22.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05829 ( -0.0726988 0.073815 )
Norm@50keV : 3.01746E-03 ( -0.000125045 0.000124196 )
------------------------------------------------------------
# Chi-Squared = 68.41 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 57 degrees of freedom
# Null hypothesis probability = 1.432557e-01
Photon flux (15-150 keV) in 90.46 sec: 0.465186 ( -0.0177791 0.0178425 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52683e-06 ( -9.75466e-08 9.80062e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -67.900 sec. to 22.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40857 ( -0.352198 0.324338 )
Epeak [keV] : 41.0757 ( -7.83326 5.99254 )
Norm@50keV : 6.69499E-03 ( -0.002163 0.00358684 )
------------------------------------------------------------
# Chi-Squared = 55.80 using 59 PHA bins.
# Reduced chi-squared = 0.9965 for 56 degrees of freedom
# Null hypothesis probability = 4.823113e-01
Photon flux (15-150 keV) in 90.46 sec: 0.443384 ( -0.020362 0.020488 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57654e-06 ( -2.13685e-07 2.98283e-07 ) ergs/cm2
Band function
Time interval is from -67.900 sec. to 22.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12590 ( -0.553025 0.850004 )
beta : -2.44121 ( 2.44353 0.244356 )
Epeak [keV] : 38.7222 ( -6.10788 7.17188 )
Norm@50keV : 1.00387E-02 ( -0.00522048 0.0264422 )
------------------------------------------------------------
# Chi-Squared = 55.01 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 55 degrees of freedom
# Null hypothesis probability = 4.744158e-01
Photon flux (15-150 keV) in 90.46 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] : 10.8271 ( )
R^2/D10^2 : 0.148892 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 165.75 using 59 PHA bins.
# Reduced chi-squared = 2.9080 for 57 degrees of freedom
# Null hypothesis probability = 1.501872e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.288e-07 2.261e-08
25- 50 9.108e-07 3.704e-08
50-150 5.957e-07 5.229e-08
15-150 1.835e-06 6.830e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.7812 (-7.09321 8.46281)
Norm : 2.27607 (-0.148979 0.162133)
------------------------------------------------------------
# Chi-Squared = 55.94 using 59 PHA bins.
# Reduced chi-squared = 0.9814 for 57 degrees of freedom
# Null hypothesis probability = 5.148763e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.244e-07 2.831e-08
25- 50 8.201e-07 3.080e-08
50-150 1.005e-06 9.069e-08
15-150 2.349e-06 9.951e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.45823 (-1.0268 0.98548)
R1^2/D10^2 : 0.749535 (-0.280785 0.631005)
kT2 [keV] : 19.3418 (-3.03232 4.52122)
R2^2/D10^2 : 1.06124E-02 (-0.00622795 0.0120357)
------------------------------------------------------------
# Chi-Squared = 62.11 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 55 degrees of freedom
# Null hypothesis probability = 2.376645e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.847e-07 6.884e-08
25- 50 8.248e-07 9.019e-08
50-150 1.001e-06 2.145e-07
15-150 2.311e-06 3.162e-07
Peak spectrum fit
Power-law model
Time interval is from 3.588 sec. to 4.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94034 ( -0.0830812 0.0845589 )
Norm@50keV : 3.17418E-02 ( -0.00163066 0.00161902 )
------------------------------------------------------------
# Chi-Squared = 73.26 using 59 PHA bins.
# Reduced chi-squared = 1.285 for 57 degrees of freedom
# Null hypothesis probability = 7.221158e-02
Photon flux (15-150 keV) in 1 sec: 4.63531 ( -0.218211 0.218588 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9203e-07 ( -1.46189e-08 1.46934e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.588 sec. to 4.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12736 ( -0.432402 0.388486 )
Epeak [keV] : 48.4045 ( -5.65137 8.07558 )
Norm@50keV : 8.73670E-02 ( -0.03308 0.06206 )
------------------------------------------------------------
# Chi-Squared = 59.11 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 56 degrees of freedom
# Null hypothesis probability = 3.627228e-01
Photon flux (15-150 keV) in 1 sec: 4.44248 ( -0.23442 0.23487 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93743e-07 ( -2.7389e-08 3.8513e-08 ) ergs/cm2
Band function
Time interval is from 3.588 sec. to 4.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.633956 ( -0.643043 1.3209 )
beta : -2.42024 ( -0.670684 0.287594 )
Epeak [keV] : 42.3259 ( -8.31487 7.9186 )
Norm@50keV : 0.177425 ( -0.101249 1.22799 )
------------------------------------------------------------
# Chi-Squared = 56.01 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 55 degrees of freedom
# Null hypothesis probability = 4.366927e-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] : 11.1683 ( )
R^2/D10^2 : 1.41096 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 122.29 using 59 PHA bins.
# Reduced chi-squared = 2.1454 for 57 degrees of freedom
# Null hypothesis probability = 1.152850e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.688e-08 2.810e-09
25- 50 1.063e-07 5.500e-09
50-150 7.578e-08 8.500e-09
15-150 2.190e-07 1.180e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.2855 (-10.5635 13.3288)
Norm : 21.8680 (-1.59385 1.74431)
------------------------------------------------------------
# Chi-Squared = 59.50 using 59 PHA bins.
# Reduced chi-squared = 1.044 for 57 degrees of freedom
# Null hypothesis probability = 3.846925e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.661e-08 3.845e-09
25- 50 9.240e-08 4.290e-09
50-150 1.274e-07 1.310e-08
15-150 2.764e-07 1.545e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.72271 (-1.36644 1.14422)
R1^2/D10^2 : 4.23143 (-1.45058 3.35982)
kT2 [keV] : 24.1153 (-6.07838 11.3469)
R2^2/D10^2 : 4.39651E-02 (-0.0331108 0.108637)
------------------------------------------------------------
# Chi-Squared = 60.90 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 55 degrees of freedom
# Null hypothesis probability = 2.719428e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.892e-08 6.800e-09
25- 50 9.822e-08 1.212e-08
50-150 1.262e-07 5.261e-08
15-150 2.733e-07 6.385e-08
Plot creation:
Mon Mar 26 13:48:22 EDT 2012