batgrbproduct Analysis for Trigger=458942
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 Aug 8 23:29:26 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger458942/GCN5_download_cron
======================================================================
Trigger: 00458942 Segment: 000
BAT Trigger Time: 334517874.24 [s; MET]
Trigger Stop: 334517875.264 [s; MET]
UTC: 2011-08-08T17:37:46.999980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 81.981847859047 Dec: -41.7107703537607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.72
Image Trigger?: NO
Rate S/N Ratio: 12.2065556157337 [ if not an image trigger ]
Image S/N Ratio: 6.72
Flight Position: [ source = BAT ]
RA: 81.981847859047 Dec: -41.7107703537607 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 81.8949481428044 Dec: -41.7082077438492 [deg; J2000]
{ 05h 27m 34.8s , -41d 42' 29.5" }
+/- 4.72270666251765 [arcmin] (estimated 90% radius based on SNR)
+/- 2.89171028334843 [arcmin] (formal 1-sigma fit error)
SNR: 3.31122292931704
Angular difference between Flight and Ground position is 3.895420 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: -2.98023223876953e-08
to: 1.02399995923042 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.002862 -0.004990 0.021255 0.031746
0.006891 0.007812 0.007082 0.007410 [error]
Peak -0.002862 -0.004990 0.021255 0.031746
0.006891 0.007812 0.007082 0.007410 [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 1.25e-10 1.33e-09 1.29e-08 8.51e-07 5.40e-08 8.64e-07 erg/cm2
Error 2.84e-10 1.74e-09 7.01e-09 4.53e-07 2.12e-08 4.51e-07 erg/cm2
Peak flux Power-law 3.70e-03 2.06e-02 9.98e-02 2.04e+00 3.15e-01 2.19e+00 ph/cm2/s
Error 8.59e-03 2.79e-02 5.66e-02 1.02e+00 1.40e-01 9.98e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 1.04e-03 1.12e-02 9.13e-02 3.15e-01 1.58e+00 0.00e+00 ph/cm2/s
Error 7.47e-03 2.56e-02 7.28e-02 1.56e-01 3.43e+00 0.00e+00 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 -1.272 0.761 - - 1.19e-03 1.28e-03 73.940 57
CPL -1.905 1.732 4026.9 0.0 7.61e-04 1.40e-02 73.560 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.272 0.761 - - 1.19e-03 1.28e-03 73.940 57
CPL -1.905 1.732 4026.9 0.0 7.61e-04 1.40e-02 73.560 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
81.8949 -41.7082 0.0580 18.1 -71.3 0.0475 3.3 TRIG_00458942
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.240 -47.807 (delta_t = 12.433 [sec])
-46.240 -10.240 (delta_t = 36.000 [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
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.27157 ( -0.629638 0.891658 )
Norm@50keV : 1.18565E-03 ( -0.00118356 0.00137442 )
------------------------------------------------------------
# Chi-Squared = 73.94 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 57 degrees of freedom
# Null hypothesis probability = 6.515435e-02
Photon flux (15-150 keV) in 1.024 sec: 0.314601 ( -0.145061 0.13453 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40159e-08 ( -2.31463e-08 1.92507e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.90501 ( -1.77449 1.6899 )
Epeak [keV] : 4026.90 ( -727.513 -727.513 )
Norm@50keV : 7.61098E-04 ( -0.00114335 0.0268526 )
------------------------------------------------------------
# Chi-Squared = 73.56 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 56 degrees of freedom
# Null hypothesis probability = 5.779067e-02
Photon flux (15-150 keV) in 1.024 sec: 0.315372 ( -0.1844 0.126988 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.496196 ( -0.496192 -0.496192 )
beta : 1.27336 ( -0.891601 0.628962 )
Epeak [keV] : 20.2329 ( -20.2333 -20.2333 )
Norm@50keV : 2.16884E-03 ( -0.00216874 274.79 )
------------------------------------------------------------
# Chi-Squared = 73.94 using 59 PHA bins.
# Reduced chi-squared = 1.344 for 55 degrees of freedom
# Null hypothesis probability = 4.513102e-02
Photon flux (15-150 keV) in 1.024 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] : 197.562 ( )
R^2/D10^2 : 2.05596E-04 (-6.69872e-05 0.000824362)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 74.83 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 57 degrees of freedom
# Null hypothesis probability = 5.670989e-02
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
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 0.689422 (-0.698206 0.689996)
------------------------------------------------------------
# Chi-Squared = 97.82 using 59 PHA bins.
# Reduced chi-squared = 1.716 for 57 degrees of freedom
# Null hypothesis probability = 6.250775e-04
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
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.201778 (-0.201778 -0.201778)
R1^2/D10^2 : 1.72676E-04 (-0.000172697 -0.000172697)
kT2 [keV] : 199.363 (-200 -200)
R2^2/D10^2 : 2.02194E-04 (-6.55296e-05 0.000823612)
------------------------------------------------------------
# Chi-Squared = 74.82 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.894832e-02
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
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.27157 ( -0.629638 0.891658 )
Norm@50keV : 1.18565E-03 ( -0.00118356 0.00137442 )
------------------------------------------------------------
# Chi-Squared = 73.94 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 57 degrees of freedom
# Null hypothesis probability = 6.515435e-02
Photon flux (15-150 keV) in 1.024 sec: 0.314601 ( -0.145061 0.13453 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40159e-08 ( -2.31463e-08 1.92507e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.90501 ( -1.77449 1.6899 )
Epeak [keV] : 4026.90 ( -727.513 -727.513 )
Norm@50keV : 7.61098E-04 ( -0.00114335 0.0268526 )
------------------------------------------------------------
# Chi-Squared = 73.56 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 56 degrees of freedom
# Null hypothesis probability = 5.779067e-02
Photon flux (15-150 keV) in 1.024 sec: 0.315372 ( -0.1844 0.126988 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.496196 ( -0.496192 -0.496192 )
beta : 1.27336 ( -0.891601 0.628962 )
Epeak [keV] : 20.2329 ( -20.2333 -20.2333 )
Norm@50keV : 2.16884E-03 ( -0.00216874 274.79 )
------------------------------------------------------------
# Chi-Squared = 73.94 using 59 PHA bins.
# Reduced chi-squared = 1.344 for 55 degrees of freedom
# Null hypothesis probability = 4.513102e-02
Photon flux (15-150 keV) in 1.024 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] : 197.562 ( )
R^2/D10^2 : 2.05596E-04 (-6.69872e-05 0.000824362)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 74.83 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 57 degrees of freedom
# Null hypothesis probability = 5.670989e-02
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
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 0.689422 (-0.698206 0.689996)
------------------------------------------------------------
# Chi-Squared = 97.82 using 59 PHA bins.
# Reduced chi-squared = 1.716 for 57 degrees of freedom
# Null hypothesis probability = 6.250775e-04
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
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.201778 (-0.201778 -0.201778)
R1^2/D10^2 : 1.72676E-04 (-0.000172697 -0.000172697)
kT2 [keV] : 199.363 (-200 -200)
R2^2/D10^2 : 2.02194E-04 (-6.55296e-05 0.000823612)
------------------------------------------------------------
# Chi-Squared = 74.82 using 59 PHA bins.
# Reduced chi-squared = 1.360 for 55 degrees of freedom
# Null hypothesis probability = 3.894832e-02
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:
Mon Aug 8 23:41:52 EDT 2011