batgrbproduct Analysis for Trigger=502024
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): Thu Sep 1 21:07:40 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger502024/GCN5_download_cron
======================================================================
Trigger: 00502024 Segment: 000
BAT Trigger Time: 336571649.664 [s; MET]
Trigger Stop: 336571657.856 [s; MET]
UTC: 2011-09-01T12:07:22.343860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.251751459167 Dec: -29.3460900568357 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: NO
Rate S/N Ratio: 11.1803398874989 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 266.251751459167 Dec: -29.3460900568357 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.307789539035 Dec: -29.269621823853 [deg; J2000]
{ 17h 45m 13.9s , -29d 16' 10.6" }
+/- 2.84933665494166 [arcmin] (estimated 90% radius based on SNR)
+/- 2.13689439258166 [arcmin] (formal 1-sigma fit error)
SNR: 6.81529140482891
Angular difference between Flight and Ground position is 5.444884 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 8.57600003480911 +/- 2.94156417057189
Measured from: 1.68000012636185
to: 10.256000161171 [s; relative to TRIGTIME]
T50: 1.98400002717972 +/- 3.07882574251269
Measured from: 5.71200013160706
to: 7.69600015878677 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.62800002098083
to: 6.62800002098083 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.36000001430511
to: 11.3440000414848 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.151913 0.009903 0.023438 -0.002527
0.018499 0.016286 0.013778 0.011752 [error]
Peak 0.032053 0.017111 0.000568 -0.002955
0.005957 0.005163 0.004382 0.003780 [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 4.56e-08 6.65e-09 4.39e-10 3.09e-11 5.27e-08 5.27e-08 erg/cm2
Error 9.92e-09 5.25e-09 9.57e-10 1.61e-10 1.40e-08 1.41e-08 erg/cm2
Peak flux Power-law 3.03e-01 1.18e-01 2.69e-02 7.38e-03 4.53e-01 4.55e-01 ph/cm2/s
Error 8.78e-02 4.66e-02 2.21e-02 1.21e-02 1.22e-01 1.24e-01 ph/cm2/s
Fluence Cutoff-PL 4.94e-08 1.84e-09 1.76e-14 2.08e-26 5.12e-08 5.12e-08 erg/cm2
Error 1.14e-08 7.67e-09 9.75e-11 0.00e+00 1.17e-08 1.17e-08 erg/cm2
Peak flux Cutoff-PL 3.01e-01 1.27e-01 2.06e-02 1.40e-03 4.50e-01 4.51e-01 ph/cm2/s
Error 9.19e-02 5.54e-02 2.55e-02 1.11e-02 1.20e-01 1.21e-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 5.919 1.302 - - 4.61e-05 7.75e-05 40.300 57
CPL 1.000 0.000 50.0 0.0 2.25e-03 0.00e+00 83.820 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.136 0.763 - - 1.49e-03 9.52e-04 42.340 57
CPL 1.885 0.000 2.8 0.0 1.10e-02 0.00e+00 41.960 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 9.984 1.360 11.344
T90 8.576 1.680 10.256
T50 1.984 5.712 7.696
Peak 1.000 5.628 6.628
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.3078 -29.2696 0.0282 13.2 38.7 0.2081 6.8 TRIG_00502024
------------------------------------------
Foreground time interval of the image:
1.360 11.344 (delta_t = 9.984 [sec])
Background time interval of the image:
-239.664 1.360 (delta_t = 241.024 [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 1.360 sec. to 11.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.91892 ( -1.16829 1.4355 )
Norm@50keV : 4.61085E-05 ( -4.61085e-05 0.000108884 )
------------------------------------------------------------
# Chi-Squared = 40.30 using 59 PHA bins.
# Reduced chi-squared = 0.7071 for 57 degrees of freedom
# Null hypothesis probability = 9.540214e-01
Photon flux (15-150 keV) in 9.984 sec: 0.174932 ( -0.0402663 0.0404121 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.2672e-08 ( -1.35436e-08 1.45423e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.360 sec. to 11.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.24958E-03 ( )
------------------------------------------------------------
# Chi-Squared = 83.82 using 59 PHA bins.
# Reduced chi-squared = 1.497 for 56 degrees of freedom
# Null hypothesis probability = 9.417238e-03
Photon flux (15-150 keV) in 9.984 sec: 0.178931 ( -0.039454 0.038592 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.12186e-08 ( -1.16875e-08 1.16906e-08 ) ergs/cm2
Band function
Time interval is from 1.360 sec. to 11.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.80552 ( 6.64101 6.64101 )
beta : -5.91780 ( -2.0564 0.546047 )
Epeak [keV] : 1.41873 ( -1.41873 -1.41873 )
Norm@50keV : 6.27440E-03 ( -0.0062744 0.0147928 )
------------------------------------------------------------
# Chi-Squared = 40.30 using 59 PHA bins.
# Reduced chi-squared = 0.7328 for 55 degrees of freedom
# Null hypothesis probability = 9.312054e-01
Photon flux (15-150 keV) in 9.984 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] : 2.32167 (-0.445535 0.537602)
R^2/D10^2 : 154.521 (-154.521 690.229)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 39.42 using 59 PHA bins.
# Reduced chi-squared = 0.6916 for 57 degrees of freedom
# Null hypothesis probability = 9.633015e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.858e-08 2.626e-08
25- 50 2.622e-09 1.618e-09
50-150 3.900e-13 4.882e-13
15-150 5.120e-08 2.829e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.08914 (-1.13439 1.68702)
Norm : 89.9197 (-89.9194 315.439)
------------------------------------------------------------
# Chi-Squared = 39.69 using 59 PHA bins.
# Reduced chi-squared = 0.6962 for 57 degrees of freedom
# Null hypothesis probability = 9.606926e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.754e-08 2.645e-08
25- 50 3.673e-09 2.304e-09
50-150 6.207e-12 7.213e-12
15-150 5.122e-08 2.876e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.25942 (-0.446337 0.522912)
R1^2/D10^2 : 185.591 (-185.788 918.391)
kT2 [keV] : 24.8262 (-25.2746 -25.2746)
R2^2/D10^2 : 7.59374E-04 (-0.000741382 0.0255029)
------------------------------------------------------------
# Chi-Squared = 37.20 using 59 PHA bins.
# Reduced chi-squared = 0.6764 for 55 degrees of freedom
# Null hypothesis probability = 9.685071e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.797e-08 2.548e-08
25- 50 6.867e-09 3.944e-09
50-150 2.107e-08 1.982e-08
15-150 7.591e-08 3.940e-08
Peak spectrum fit
Power-law model
Time interval is from 5.628 sec. to 6.628 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.13648 ( -0.647019 0.879846 )
Norm@50keV : 1.48766E-03 ( -0.000869877 0.00103485 )
------------------------------------------------------------
# Chi-Squared = 42.34 using 59 PHA bins.
# Reduced chi-squared = 0.7428 for 57 degrees of freedom
# Null hypothesis probability = 9.262715e-01
Photon flux (15-150 keV) in 1 sec: 0.452602 ( -0.122265 0.122725 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9092e-08 ( -6.36157e-09 7.18864e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.628 sec. to 6.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88544 ( )
Epeak [keV] : 2.78649 ( )
Norm@50keV : 1.09667E-02 ( )
------------------------------------------------------------
# Chi-Squared = 41.96 using 59 PHA bins.
# Reduced chi-squared = 0.7493 for 56 degrees of freedom
# Null hypothesis probability = 9.181704e-01
Photon flux (15-150 keV) in 1 sec: 0.450370 ( -0.119147 0.120833 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81615e-08 ( -5.8725e-09 7.4906e-09 ) ergs/cm2
Band function
Time interval is from 5.628 sec. to 6.628 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.96672 ( 1.90482 1.90482 )
beta : -9.37167 ( 9.99999 20 )
Epeak [keV] : 0.863692 ( -0.863692 20.8198 )
Norm@50keV : 9.68078E-03 ( -0.00507634 0.0119554 )
------------------------------------------------------------
# Chi-Squared = 41.94 using 59 PHA bins.
# Reduced chi-squared = 0.7626 for 55 degrees of freedom
# Null hypothesis probability = 9.023316e-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] : 4.92257 (-1.55712 2.33111)
R^2/D10^2 : 4.03321 (-4.08019 23.4866)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 44.59 using 59 PHA bins.
# Reduced chi-squared = 0.7823 for 57 degrees of freedom
# Null hypothesis probability = 8.840900e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.211e-09 5.395e-09
25- 50 5.787e-09 3.629e-09
50-150 2.181e-10 2.182e-10
15-150 1.522e-08 9.280e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.2942 (-8.10116 15.4771)
Norm : 6.64006 (-3.48498 10.7681)
------------------------------------------------------------
# Chi-Squared = 42.16 using 59 PHA bins.
# Reduced chi-squared = 0.7396 for 57 degrees of freedom
# Null hypothesis probability = 9.291402e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.005e-09 4.199e-09
25- 50 7.000e-09 4.106e-09
50-150 1.623e-09 1.491e-09
15-150 1.763e-08 8.247e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.94439 (-1.48921 2.05075)
R1^2/D10^2 : 38.5799 (-33.7312 3827.87)
kT2 [keV] : 9.41095 (-4.2895 9.79204)
R2^2/D10^2 : 0.150413 (-0.141115 2.20738)
------------------------------------------------------------
# Chi-Squared = 40.94 using 59 PHA bins.
# Reduced chi-squared = 0.7443 for 55 degrees of freedom
# Null hypothesis probability = 9.208374e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.065e-09 4.703e-09
25- 50 6.906e-09 3.865e-09
50-150 2.634e-09 2.186e-09
15-150 1.860e-08 9.810e-09
Plot creation:
Thu Sep 1 21:24:08 EDT 2011