batgrbproduct Analysis for Trigger=510701
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 Dec 29 19:34:46 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger510701/GCN5_download_cron
======================================================================
Trigger: 00510701 Segment: 000
BAT Trigger Time: 346833568 [s; MET]
Trigger Stop: 346833888 [s; MET]
UTC: 2011-12-29T06:39:20.274000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.516279919147 Dec: -47.3791963548427 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.87
Flight Position: [ source = BAT ]
RA: 248.516279919147 Dec: -47.3791963548427 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.532596343749 Dec: -47.4031115583923 [deg; J2000]
{ 16h 34m 07.8s , -47d 24' 11.2" }
+/- 3.10751780144627 [arcmin] (estimated 90% radius based on SNR)
+/- 1.71931231246786 [arcmin] (formal 1-sigma fit error)
SNR: 6.02102380162211
Angular difference between Flight and Ground position is 1.580578 arcmin
Partial Coding Fraction: 0.875 [ 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 0.978235 0.815369 0.102873 -0.070049
0.114136 0.110000 0.095131 0.084374 [error]
Peak 0.978235 0.815369 0.102873 -0.070049
0.114136 0.110000 0.095131 0.084374 [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 3.04e-07 2.82e-07 1.82e-07 1.80e-07 8.43e-07 9.48e-07 erg/cm2
Error 5.33e-08 5.36e-08 6.95e-08 1.27e-07 1.68e-07 2.40e-07 erg/cm2
Peak flux Power-law 3.16e-02 1.64e-02 5.26e-03 2.17e-03 5.44e-02 5.54e-02 ph/cm2/s
Error 5.65e-03 2.98e-03 1.95e-03 1.44e-03 8.28e-03 8.54e-03 ph/cm2/s
Fluence Cutoff-PL 2.92e-07 3.42e-07 5.07e-08 2.87e-10 6.85e-07 6.85e-07 erg/cm2
Error 6.02e-08 7.44e-08 7.23e-08 9.91e-09 1.28e-07 1.28e-07 erg/cm2
Peak flux Cutoff-PL 2.94e-02 2.03e-02 1.69e-03 5.19e-06 5.14e-02 5.14e-02 ph/cm2/s
Error 6.44e-03 4.24e-03 2.21e-03 1.60e-04 8.06e-03 8.06e-03 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 2.637 0.350 - - 2.54e-04 7.23e-05 63.300 57
CPL 1.000 0.000 50.0 0.0 1.08e-03 0.00e+00 81.510 56
The chi2 of BB fit is 56.88 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 2.637 0.350 - - 2.54e-04 7.23e-05 63.300 57
CPL 1.000 0.000 50.0 0.0 1.08e-03 0.00e+00 81.510 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
248.5326 -47.4031 0.0320 15.1 -103.0 1.7447 6.0 TRIG_00510701
------------------------------------------
Foreground time interval of the image:
0.000 195.650 (delta_t = 195.650 [sec])
197.000 320.000 (delta_t = 123.000 [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 195.650000
197.000000 320.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63709 ( -0.326745 0.373609 )
Norm@50keV : 2.54028E-04 ( -7.12871e-05 7.32684e-05 )
------------------------------------------------------------
# Chi-Squared = 63.30 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.638812e-01
Photon flux (15-150 keV) in 318.6 sec: 5.44056E-02 ( -0.00827575 0.00828562 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.42939e-07 ( -1.6289e-07 1.73913e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 195.650000
197.000000 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 : 1.08132E-03 ( )
------------------------------------------------------------
# Chi-Squared = 81.51 using 59 PHA bins.
# Reduced chi-squared = 1.456 for 56 degrees of freedom
# Null hypothesis probability = 1.464214e-02
Photon flux (15-150 keV) in 318.6 sec: 5.13766E-02 ( -0.0080302 0.0080824 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.84914e-07 ( -1.18561e-07 1.38037e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 195.650000
197.000000 320.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.46692 ( -3.20485 -1.43572 )
beta : -5.19651 ( 5.06132 2.08857 )
Epeak [keV] : 25.1474 ( -7.56742 3.98082 )
Norm@50keV : 0.176480 ( -0.153015 27.8531 )
------------------------------------------------------------
# Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 55 degrees of freedom
# Null hypothesis probability = 4.067993e-01
Photon flux (15-150 keV) in 318.6 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] : 6.51891 (-0.860773 0.97202)
R^2/D10^2 : 0.144212 (-0.0647232 0.120335)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.88 using 59 PHA bins.
# Reduced chi-squared = 0.9979 for 57 degrees of freedom
# Null hypothesis probability = 4.794472e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.895e-07 7.742e-08
25- 50 3.441e-07 9.795e-08
50-150 4.375e-08 2.496e-08
15-150 6.773e-07 1.712e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.5435 (-6.74756 10.4393)
Norm : 0.531625 (-0.15476 0.233789)
------------------------------------------------------------
# Chi-Squared = 59.32 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.909029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.065e-07 6.576e-08
25- 50 3.104e-07 7.425e-08
50-150 1.284e-07 7.911e-08
15-150 7.453e-07 1.991e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.13395E-04 ( )
R1^2/D10^2 : 0.219529 (-0.219529 -0.219529)
kT2 [keV] : 6.51891 (-0.860773 0.97202)
R2^2/D10^2 : 0.144212 (-0.0647232 0.120335)
------------------------------------------------------------
# Chi-Squared = 56.90 using 59 PHA bins.
# Chi-Squared = 56.88 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Null hypothesis probability = 4.043268e-01
# Null hypothesis probability = 4.047880e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.907e-07 1.657e-04
25- 50 3.425e-07 1.278e-03
50-150 4.791e-08 1.403e-02
15-150 6.810e-07 2.208e-02
Peak spectrum fit
Power-law model
Time interval is from 197.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.63709 ( -0.326745 0.373609 )
Norm@50keV : 2.54028E-04 ( -7.12871e-05 7.32684e-05 )
------------------------------------------------------------
# Chi-Squared = 63.30 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.638812e-01
Photon flux (15-150 keV) in 318.6 sec: 5.44056E-02 ( -0.00827575 0.00828562 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.42939e-07 ( -1.6289e-07 1.73913e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 197.000 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 : 1.08132E-03 ( )
------------------------------------------------------------
# Chi-Squared = 81.51 using 59 PHA bins.
# Reduced chi-squared = 1.456 for 56 degrees of freedom
# Null hypothesis probability = 1.464214e-02
Photon flux (15-150 keV) in 318.6 sec: 5.13766E-02 ( -0.0080302 0.0080824 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.84914e-07 ( -1.18561e-07 1.38037e-07 ) ergs/cm2
Band function
Time interval is from 197.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.46692 ( -3.20485 -1.43572 )
beta : -5.19651 ( 5.06132 2.08857 )
Epeak [keV] : 25.1474 ( -7.58515 3.98083 )
Norm@50keV : 0.176480 ( -0.153015 27.8528 )
------------------------------------------------------------
# Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 55 degrees of freedom
# Null hypothesis probability = 4.067993e-01
Photon flux (15-150 keV) in 318.6 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] : 6.51891 (-0.860773 0.97202)
R^2/D10^2 : 0.144212 (-0.0647232 0.120335)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.88 using 59 PHA bins.
# Reduced chi-squared = 0.9979 for 57 degrees of freedom
# Null hypothesis probability = 4.794472e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.895e-07 7.192e-08
25- 50 3.441e-07 9.200e-08
50-150 4.375e-08 2.367e-08
15-150 6.773e-07 1.671e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.5435 (-6.74756 10.4393)
Norm : 0.531625 (-0.15476 0.233789)
------------------------------------------------------------
# Chi-Squared = 59.32 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.909029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.065e-07 6.127e-08
25- 50 3.104e-07 8.629e-08
50-150 1.284e-07 8.104e-08
15-150 7.453e-07 1.709e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.13395E-04 ( )
R1^2/D10^2 : 0.219529 (-0.219529 -0.219529)
kT2 [keV] : 6.51891 (-0.860773 0.97202)
R2^2/D10^2 : 0.144212 (-0.0647232 0.120335)
------------------------------------------------------------
# Chi-Squared = 56.90 using 59 PHA bins.
# Chi-Squared = 56.88 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Reduced chi-squared = 1.034 for 55 degrees of freedom
# Null hypothesis probability = 4.043268e-01
# Null hypothesis probability = 4.047880e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.907e-07 1.529e-04
25- 50 3.425e-07 1.493e-03
50-150 4.791e-08 2.238e-02
15-150 6.810e-07 1.572e-02
Plot creation:
Thu Dec 29 19:57:11 EST 2011