batgrbproduct Analysis for Trigger=437016
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): Sun Oct 24 20:18:53 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger437016/GCN5_download_cron
======================================================================
Trigger: 00437016 Segment: 000
BAT Trigger Time: 309613176.128 [s; MET]
Trigger Stop: 309613176.384 [s; MET]
UTC: 2010-10-24T11:39:29.826060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 66.4748790740036 Dec: -77.2476285132087 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.55
Image Trigger?: NO
Rate S/N Ratio: 29.698484809835 [ if not an image trigger ]
Image S/N Ratio: 11.55
Flight Position: [ source = BAT ]
RA: 66.4748790740036 Dec: -77.2476285132087 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 66.4651041235144 Dec: -77.2610192953414 [deg; J2000]
{ 04h 25m 51.6s , -77d 15' 39.7" }
+/- 1.05458067172549 [arcmin] (estimated 90% radius based on SNR)
+/- 0.380343637664659 [arcmin] (formal 1-sigma fit error)
SNR: 28.1933853021721
Angular difference between Flight and Ground position is 0.813800 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 18.7239999771118 +/- 0.488491546585049
Measured from: 0.132000088691711
to: 18.8560000658035 [s; relative to TRIGTIME]
T50: 13.6679999232292 +/- 4.85472966560196
Measured from: 2.05200010538101
to: 15.7200000286102 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.39199995994568
to: 10.3919999599457 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.252000033855438
to: 20.1319999694824 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.831760 1.040737 0.653536 0.072101
0.030757 0.032192 0.027694 0.022432 [error]
Peak 0.162505 0.270611 0.200074 0.038629
0.008779 0.010136 0.009212 0.006172 [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 2.93e-07 4.38e-07 4.90e-07 1.04e-06 1.54e-06 2.26e-06 erg/cm2
Error 1.91e-08 1.74e-08 2.72e-08 1.22e-07 6.42e-08 1.44e-07 erg/cm2
Peak flux Power-law 1.80e+00 1.83e+00 1.32e+00 1.51e+00 5.54e+00 6.46e+00 ph/cm2/s
Error 1.16e-01 7.91e-02 7.03e-02 1.54e-01 2.32e-01 2.80e-01 ph/cm2/s
Fluence Cutoff-PL 2.60e-07 4.65e-07 5.02e-07 4.19e-07 1.45e-06 1.65e-06 erg/cm2
Error 2.32e-08 2.11e-08 3.00e-08 1.53e-07 7.21e-08 1.69e-07 erg/cm2
Peak flux Cutoff-PL 1.53e+00 2.08e+00 1.44e+00 5.25e-01 5.43e+00 5.58e+00 ph/cm2/s
Error 1.35e-01 1.05e-01 8.47e-02 2.67e-01 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 5.62e+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 1.838 0.071 - - 8.19e-03 3.38e-04 66.910 57
CPL 1.147 0.310 60.0 9.3 1.84e-02 6.79e-03 49.930 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 1.476 0.064 - - 4.46e-02 1.94e-03 90.760 57
CPL 0.373 0.309 71.6 8.6 1.69e-01 6.42e-02 43.470 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: 18.624000 sec.
T50 in the 50-300 keV band: 9.216000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 20.384 -0.252 20.132
T90 18.724 0.132 18.856
T50 13.668 2.052 15.720
Peak 1.000 9.392 10.392
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
66.4651 -77.2610 0.0068 31.0 178.8 1.1406 28.2 TRIG_00437016
------------------------------------------
Foreground time interval of the image:
-0.252 9.273 (delta_t = 9.525 [sec])
Background time interval of the image:
-239.128 -0.252 (delta_t = 238.876 [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 -0.252 sec. to 20.132 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83754 ( -0.0710207 0.0718027 )
Norm@50keV : 8.19015E-03 ( -0.000339153 0.000337655 )
------------------------------------------------------------
# Chi-Squared = 66.91 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.733086e-01
Photon flux (15-150 keV) in 20.38 sec: 1.14543 ( -0.0469614 0.0470781 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53507e-06 ( -6.40711e-08 6.42903e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.252 sec. to 20.132 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14675 ( -0.321401 0.299346 )
Epeak [keV] : 59.9695 ( -6.80702 11.7598 )
Norm@50keV : 1.84142E-02 ( -0.00534211 0.00824366 )
------------------------------------------------------------
# Chi-Squared = 49.93 using 59 PHA bins.
# Reduced chi-squared = 0.8917 for 56 degrees of freedom
# Null hypothesis probability = 7.025057e-01
Photon flux (15-150 keV) in 20.38 sec: 1.09639 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45499e-06 ( -7.19108e-08 7.22614e-08 ) ergs/cm2
Band function
Time interval is from -0.252 sec. to 20.132 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14677 ( -0.286444 0.338927 )
beta : -10.00000 ( 1.02892e+11 1.02892e+11 )
Epeak [keV] : 59.9613 ( -6.81946 11.7545 )
Norm@50keV : 1.84115E-02 ( -0.00534121 0.00824808 )
------------------------------------------------------------
# Chi-Squared = 49.93 using 59 PHA bins.
# Reduced chi-squared = 0.9079 for 55 degrees of freedom
# Null hypothesis probability = 6.680439e-01
Photon flux (15-150 keV) in 20.38 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 9.392 sec. to 10.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47577 ( -0.06407 0.0645668 )
Norm@50keV : 4.46452E-02 ( -0.00194102 0.00193636 )
------------------------------------------------------------
# Chi-Squared = 90.76 using 59 PHA bins.
# Reduced chi-squared = 1.592 for 57 degrees of freedom
# Null hypothesis probability = 2.968227e-03
Photon flux (15-150 keV) in 1 sec: 5.53796 ( -0.232018 0.232048 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.25263e-07 ( -2.02807e-08 2.03459e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.392 sec. to 10.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.373426 ( -0.320479 0.298345 )
Epeak [keV] : 71.5687 ( -6.92619 10.1899 )
Norm@50keV : 0.169160 ( -0.0502189 0.0782223 )
------------------------------------------------------------
# Chi-Squared = 43.47 using 59 PHA bins.
# Reduced chi-squared = 0.7762 for 56 degrees of freedom
# Null hypothesis probability = 8.891398e-01
Photon flux (15-150 keV) in 1 sec: 5.42692 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00027e-07 ( -2.1527e-08 2.164e-08 ) ergs/cm2
Band function
Time interval is from 9.392 sec. to 10.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.373127 ( -0.208104 0.428615 )
beta : -10.00000 ( 3.94151e+08 3.94151e+08 )
Epeak [keV] : 71.5479 ( -6.91779 10.1946 )
Norm@50keV : 0.169233 ( -0.0502826 0.0782375 )
------------------------------------------------------------
# Chi-Squared = 43.47 using 59 PHA bins.
# Reduced chi-squared = 0.7903 for 55 degrees of freedom
# Null hypothesis probability = 8.692209e-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] : ( )
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:
Sun Oct 24 20:38:15 EDT 2010