batgrbproduct Analysis for Trigger=437313
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): Fri Oct 29 17:23:47 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger437313/GCN5_download_cron
======================================================================
Trigger: 00437313 Segment: 000
BAT Trigger Time: 309998128 [s; MET]
Trigger Stop: 309998448 [s; MET]
UTC: 2010-10-28T22:35:21.684060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.055559718465 Dec: -24.8219242744978 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.52
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.52
Flight Position: [ source = BAT ]
RA: 267.055559718465 Dec: -24.8219242744978 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.100241035399 Dec: -24.7630275922706 [deg; J2000]
{ 17h 48m 24.1s , -24d 45' 46.9" }
+/- 2.93446262706036 [arcmin] (estimated 90% radius based on SNR)
+/- 1.36688343005162 [arcmin] (formal 1-sigma fit error)
SNR: 6.53462100762476
Angular difference between Flight and Ground position is 4.290813 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.892037 0.202269 0.085698 0.195241
0.105736 0.098573 0.087134 0.083394 [error]
Peak 0.892037 0.202269 0.085698 0.195241
0.105736 0.098573 0.087134 0.083394 [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 2.41e-07 1.05e-07 2.74e-08 8.81e-09 3.79e-07 3.83e-07 erg/cm2
Error 4.94e-08 4.96e-08 2.86e-08 1.91e-08 1.09e-07 1.16e-07 erg/cm2
Peak flux Power-law 2.93e-02 7.64e-03 1.05e-03 1.64e-04 3.81e-02 3.81e-02 ph/cm2/s
Error 5.12e-03 3.20e-03 1.14e-03 2.90e-04 7.76e-03 7.81e-03 ph/cm2/s
Fluence Cutoff-PL 2.57e-07 7.80e-08 1.60e-09 4.21e-13 3.37e-07 3.37e-07 erg/cm2
Error 7.26e-08 6.60e-08 3.01e-08 1.64e-09 1.10e-07 1.19e-07 erg/cm2
Peak flux Cutoff-PL 3.16e-02 5.67e-03 4.49e-05 2.24e-09 3.73e-02 3.73e-02 ph/cm2/s
Error 6.31e-03 4.36e-03 1.01e-03 7.24e-03 0.00e+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 3.941 0.818 - - 6.48e-05 6.35e-05 45.380 57
CPL 1.000 0.000 50.0 0.0 6.27e-04 0.00e+00 78.370 56
The chi2 of BB fit is which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.729 0.733 - - 7.94e-05 6.56e-05 46.440 57
CPL 1.000 0.000 50.0 0.0 7.13e-04 0.00e+00 90.350 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.1002 -24.7630 0.0295 0.1 88.1 1.5774 6.5 TRIG_00437313
------------------------------------------
Foreground time interval of the image:
0.000 138.570 (delta_t = 138.570 [sec])
180.000 261.880 (delta_t = 81.880 [sec])
263.000 320.000 (delta_t = 57.000 [sec])
Background time interval of the image:
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
0.000000 138.570000
180.000000 261.880000
263.000000 320.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.94061 ( -0.722284 0.913167 )
Norm@50keV : 6.47662E-05 ( -6.47662e-05 6.22908e-05 )
------------------------------------------------------------
# Chi-Squared = 45.38 using 59 PHA bins.
# Reduced chi-squared = 0.7961 for 57 degrees of freedom
# Null hypothesis probability = 8.662931e-01
Photon flux (15-150 keV) in 277.5 sec: 3.79285E-02 ( -0.00824882 0.0083277 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79293e-07 ( -1.01355e-07 1.16597e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 138.570000
180.000000 261.880000
263.000000 320.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 6.26829E-04 ( )
------------------------------------------------------------
# Chi-Squared = 78.37 using 59 PHA bins.
# Reduced chi-squared = 1.399 for 56 degrees of freedom
# Null hypothesis probability = 2.589053e-02
Photon flux (15-150 keV) in 277.5 sec: 3.70605E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36655e-07 ( -8.09376e-08 1.39824e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 138.570000
180.000000 261.880000
263.000000 320.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.22790 ( 6.57997 8.71388 )
beta : -3.94061 ( -0.912112 0.72242 )
Epeak [keV] : 283.073 ( -283.073 -283.073 )
Norm@50keV : 8.80262E-03 ( -0.00545954 0.00846625 )
------------------------------------------------------------
# Chi-Squared = 45.38 using 59 PHA bins.
# Reduced chi-squared = 0.8251 for 55 degrees of freedom
# Null hypothesis probability = 8.192351e-01
Photon flux (15-150 keV) in 277.5 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from 263.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.72870 ( -0.521909 0.943893 )
Norm@50keV : 7.93559E-05 ( -7.85564e-05 5.27426e-05 )
------------------------------------------------------------
# Chi-Squared = 46.44 using 59 PHA bins.
# Reduced chi-squared = 0.8147 for 57 degrees of freedom
# Null hypothesis probability = 8.400233e-01
Photon flux (15-150 keV) in 277.5 sec: 3.80706E-02 ( -0.00769807 0.00781924 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85719e-07 ( -9.97199e-08 1.16219e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 263.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 7.13018E-04 ( )
------------------------------------------------------------
# Chi-Squared = 90.35 using 59 PHA bins.
# Reduced chi-squared = 1.613 for 56 degrees of freedom
# Null hypothesis probability = 2.475296e-03
Photon flux (15-150 keV) in 277.5 sec: 3.72708E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.3714e-07 ( -7.71217e-08 1.38164e-07 ) ergs/cm2
Band function
Time interval is from 263.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.21966 ( 1.66388 1.66388 )
beta : -4.68120 ( 4.76425 14.2218 )
Epeak [keV] : 14.0989 ( -10.5149 4.95211 )
Norm@50keV : 86.0004 ( -82.2698 2775.64 )
------------------------------------------------------------
# Chi-Squared = 45.03 using 59 PHA bins.
# Reduced chi-squared = 0.8187 for 55 degrees of freedom
# Null hypothesis probability = 8.290051e-01
Photon flux (15-150 keV) in 277.5 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Fri Oct 29 17:40:54 EDT 2010