batgrbproduct Analysis for Trigger=458059
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): Tue Jul 26 19:04:05 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger458059/GCN5_download_cron
======================================================================
Trigger: 00458059 Segment: 000
BAT Trigger Time: 333336647.744 [s; MET]
Trigger Stop: 333336648.768 [s; MET]
UTC: 2011-07-26T01:30:40.549800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 286.750618690009 Dec: 56.0532972548459 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.6
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 8.6
Flight Position: [ source = BAT ]
RA: 286.750618690009 Dec: 56.0532972548459 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.713320525394 Dec: 56.0697401511558 [deg; J2000]
{ 19h 06m 51.2s , +56d 04' 11.1" }
+/- 1.6649802257252 [arcmin] (estimated 90% radius based on SNR)
+/- 0.695797408410499 [arcmin] (formal 1-sigma fit error)
SNR: 14.6831655145219
Angular difference between Flight and Ground position is 1.591973 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 5.15599995851517 +/- 1.1073066621986
Measured from: -0.579999923706055
to: 4.57600003480911 [s; relative to TRIGTIME]
T50: 1.67999994754791 +/- 0.584564757078561
Measured from: 0.656000077724457
to: 2.33600002527237 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.611999988555908
to: 1.61199998855591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.864000022411346
to: 5.01199996471405 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.150568 0.202842 0.103416 -0.010571
0.015323 0.015973 0.014201 0.013447 [error]
Peak 0.031688 0.064986 0.031694 -0.006379
0.006508 0.006909 0.005851 0.005530 [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 4.77e-08 7.05e-08 7.77e-08 1.61e-07 2.45e-07 3.57e-07 erg/cm2
Error 6.54e-09 6.96e-09 1.29e-08 5.25e-08 2.99e-08 6.66e-08 erg/cm2
Peak flux Power-law 3.66e-01 3.38e-01 2.16e-01 2.12e-01 1.01e+00 1.13e+00 ph/cm2/s
Error 7.87e-02 5.06e-02 4.56e-02 8.49e-02 1.50e-01 1.76e-01 ph/cm2/s
Fluence Cutoff-PL 4.29e-08 8.11e-08 7.32e-08 2.79e-08 2.18e-07 2.25e-07 erg/cm2
Error 7.42e-09 9.74e-09 1.59e-08 3.89e-08 3.17e-08 4.67e-08 erg/cm2
Peak flux Cutoff-PL 3.00e-01 4.20e-01 2.12e-01 2.79e-02 9.56e-01 9.59e-01 ph/cm2/s
Error 9.04e-02 7.42e-02 6.07e-02 4.55e-02 1.51e-01 1.54e-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 1.859 0.178 - - 4.54e-03 5.50e-04 87.700 57
CPL 0.638 0.867 46.5 11.8 2.29e-02 3.71e-02 79.840 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.646 0.241 - - 7.73e-03 1.29e-03 75.300 57
CPL -0.324 1.475 50.0 13.8 1.02e-01 5.23e-01 66.280 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 5.876 -0.864 5.012
T90 5.156 -0.580 4.576
T50 1.680 0.656 2.336
Peak 1.000 0.612 1.612
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.7133 +56.0697 0.0131 9.5 -163.6 0.4342 14.7 TRIG_00458059
------------------------------------------
Foreground time interval of the image:
-0.864 5.012 (delta_t = 5.876 [sec])
Background time interval of the image:
-239.744 -68.714 (delta_t = 171.030 [sec])
-67.744 -0.864 (delta_t = 66.880 [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 -0.864 sec. to 5.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85876 ( -0.173694 0.182241 )
Norm@50keV : 4.53617E-03 ( -0.000555105 0.000545824 )
------------------------------------------------------------
# Chi-Squared = 87.70 using 59 PHA bins.
# Reduced chi-squared = 1.539 for 57 degrees of freedom
# Null hypothesis probability = 5.569738e-03
Photon flux (15-150 keV) in 5.876 sec: 0.639887 ( -0.0627799 0.0627808 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45064e-07 ( -2.95777e-08 3.0321e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.864 sec. to 5.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.637926 ( -0.955635 0.779203 )
Epeak [keV] : 46.5348 ( -8.11011 15.5608 )
Norm@50keV : 2.28536E-02 ( -0.0145712 0.0595503 )
------------------------------------------------------------
# Chi-Squared = 79.84 using 59 PHA bins.
# Reduced chi-squared = 1.426 for 56 degrees of freedom
# Null hypothesis probability = 1.990600e-02
Photon flux (15-150 keV) in 5.876 sec: 0.612647 ( -0.063994 0.064323 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.17843e-07 ( -3.0349e-08 3.29538e-08 ) ergs/cm2
Band function
Time interval is from -0.864 sec. to 5.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.637783 ( -0.612775 1.19076 )
beta : -10.00000 ( 2.77056e+08 2.77056e+08 )
Epeak [keV] : 46.5249 ( -8.10852 15.5591 )
Norm@50keV : 2.28585E-02 ( -0.0145774 0.0596205 )
------------------------------------------------------------
# Chi-Squared = 79.84 using 59 PHA bins.
# Reduced chi-squared = 1.452 for 55 degrees of freedom
# Null hypothesis probability = 1.596404e-02
Photon flux (15-150 keV) in 5.876 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] : 10.5988 (-1.15319 1.31255)
R^2/D10^2 : 0.247848 (-0.0876553 0.133314)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 90.90 using 59 PHA bins.
# Reduced chi-squared = 1.595 for 57 degrees of freedom
# Null hypothesis probability = 2.880776e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.390e-08 5.435e-09
25- 50 9.130e-08 1.137e-08
50-150 5.625e-08 1.426e-08
15-150 1.814e-07 2.212e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 79.4996 (-21.7346 37.1462)
Norm : 3.03726 (-0.408961 0.491762)
------------------------------------------------------------
# Chi-Squared = 81.77 using 59 PHA bins.
# Reduced chi-squared = 1.434 for 57 degrees of freedom
# Null hypothesis probability = 1.743672e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.629e-08 6.969e-09
25- 50 7.609e-08 8.373e-09
50-150 1.070e-07 4.580e-08
15-150 2.293e-07 4.745e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.25884 (-2.22895 2.10636)
R1^2/D10^2 : 1.02701 (-0.607547 3.49896)
kT2 [keV] : 17.1869 (-4.39918 8.5831)
R2^2/D10^2 : 2.78270E-02 (-0.0231375 0.0762063)
------------------------------------------------------------
# Chi-Squared = 79.00 using 59 PHA bins.
# Reduced chi-squared = 1.436 for 55 degrees of freedom
# Null hypothesis probability = 1.865448e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.310e-08 2.350e-08
25- 50 8.012e-08 4.054e-08
50-150 9.657e-08 5.538e-08
15-150 2.198e-07 1.138e-07
Peak spectrum fit
Power-law model
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64592 ( -0.236552 0.244918 )
Norm@50keV : 7.72778E-03 ( -0.001296 0.0012783 )
------------------------------------------------------------
# Chi-Squared = 75.30 using 59 PHA bins.
# Reduced chi-squared = 1.321 for 57 degrees of freedom
# Null hypothesis probability = 5.265266e-02
Photon flux (15-150 keV) in 1 sec: 1.00770 ( -0.150355 0.150367 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.19114e-08 ( -1.26337e-08 1.30088e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.323824 ( -1.73135 1.21784 )
Epeak [keV] : 49.9933 ( -8.96 18.6906 )
Norm@50keV : 0.102204 ( -0.1025 0.943501 )
------------------------------------------------------------
# Chi-Squared = 66.28 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 56 degrees of freedom
# Null hypothesis probability = 1.635503e-01
Photon flux (15-150 keV) in 1 sec: 0.956292 ( -0.14997 0.151078 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.07602e-08 ( -1.18339e-08 1.34258e-08 ) ergs/cm2
Band function
Time interval is from 0.612 sec. to 1.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.326232 ( -1.1113 -0.255197 )
beta : -10.00000 ( 2.06092e+06 2.06093e+06 )
Epeak [keV] : 49.9673 ( -8.99684 18.683 )
Norm@50keV : 0.102585 ( -0.102584 0.945581 )
------------------------------------------------------------
# Chi-Squared = 66.28 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 55 degrees of freedom
# Null hypothesis probability = 1.417405e-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] : 11.8624 (-1.68741 2.05753)
R^2/D10^2 : 0.276722 (-0.123583 0.20913)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.97 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.515526e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.227e-09 2.228e-09
25- 50 2.554e-08 5.555e-09
50-150 2.144e-08 7.640e-09
15-150 5.521e-08 1.080e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 117.990 (-31.0753 -100.281)
Norm : 4.41757 (-0.73353 0.912695)
------------------------------------------------------------
# Chi-Squared = 71.44 using 59 PHA bins.
# Reduced chi-squared = 1.253 for 57 degrees of freedom
# Null hypothesis probability = 9.449776e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.151e-08 2.343e-09
25- 50 2.054e-08 3.520e-09
50-150 3.635e-08 7.590e-09
15-150 6.840e-08 1.067e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.04004 (-8.06447 191.839)
R1^2/D10^2 : 0.612939 (-0.609224 -0.609224)
kT2 [keV] : 17.7161 (-17.9576 -17.9576)
R2^2/D10^2 : 3.90107E-02 (-0.0366956 0.311669)
------------------------------------------------------------
# Chi-Squared = 65.71 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.528753e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.655e-09 6.295e-09
25- 50 2.395e-08 1.637e-08
50-150 2.893e-08 1.877e-08
15-150 6.254e-08 3.570e-08
Plot creation:
Tue Jul 26 19:28:23 EDT 2011