batgrbproduct Analysis for Trigger=444230
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): Wed Feb 2 00:38:08 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger444230/GCN5_download_cron
======================================================================
Trigger: 00444230 Segment: 000
BAT Trigger Time: 318245715.52 [s; MET]
Trigger Stop: 318245716.544 [s; MET]
UTC: 2011-02-01T09:35:08.899340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 137.065563354374 Dec: 88.6075583363001 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.8
Image Trigger?: NO
Rate S/N Ratio: 36.2491379207837 [ if not an image trigger ]
Image S/N Ratio: 9.8
Flight Position: [ source = BAT ]
RA: 137.065563354374 Dec: 88.6075583363001 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 137.458580207521 Dec: 88.610201256129 [deg; J2000]
{ 09h 09m 50.1s , +88d 36' 36.7" }
+/- 1.28365324764345 [arcmin] (estimated 90% radius based on SNR)
+/- 0.646477334683736 [arcmin] (formal 1-sigma fit error)
SNR: 21.2908529356849
Angular difference between Flight and Ground position is 0.594037 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 11.6759999394417 +/- 2.28123211973421
Measured from: -1.71199983358383
to: 9.96400010585785 [s; relative to TRIGTIME]
T50: 6.17199993133545 +/- 0.749186220368623
Measured from: 0.828000128269196
to: 7.00000005960464 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.283999979496002
to: 0.716000020503998 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.84399998188019
to: 13.2919999957085 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.197488 0.344472 0.346323 0.121005
0.018517 0.019694 0.018435 0.016113 [error]
Peak 0.015633 0.046892 0.058132 0.027302
0.004898 0.005415 0.005398 0.004839 [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 5.60e-08 1.33e-07 2.51e-07 1.15e-06 6.82e-07 1.59e-06 erg/cm2
Error 6.73e-09 9.36e-09 1.74e-08 1.86e-07 4.51e-08 1.95e-07 erg/cm2
Peak flux Power-law 1.74e-01 2.86e-01 3.56e-01 8.80e-01 1.06e+00 1.70e+00 ph/cm2/s
Error 4.40e-02 4.43e-02 4.01e-02 2.19e-01 1.20e-01 2.29e-01 ph/cm2/s
Fluence Cutoff-PL 5.28e-08 1.35e-07 2.58e-07 8.19e-07 6.72e-07 1.26e-06 erg/cm2
Error 8.45e-09 1.03e-08 2.01e-08 4.06e-07 4.84e-08 3.81e-07 erg/cm2
Peak flux Cutoff-PL 1.32e-01 2.94e-01 3.96e-01 3.95e-01 1.03e+00 1.22e+00 ph/cm2/s
Error 5.51e-02 5.01e-02 5.44e-02 3.32e-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 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 1.082 0.108 - - 4.02e-03 2.38e-04 70.110 57
CPL 0.834 0.384 264.1 0.0 5.20e-03 2.13e-03 69.030 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 0.684 0.196 - - 9.20e-03 1.09e-03 53.820 57
CPL -0.263 0.000 143.2 408.7 2.30e-02 2.73e-02 50.400 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: 9.728000 sec.
T50 in the 50-300 keV band: 4.288000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 16.136 -2.844 13.292
T90 11.676 -1.712 9.964
T50 6.172 0.828 7.000
Peak 1.000 -0.284 0.716
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
137.4586 +88.6102 0.0090 10.4 -95.9 1.1311 21.3 TRIG_00444230
------------------------------------------
Foreground time interval of the image:
-2.844 13.292 (delta_t = 16.136 [sec])
Background time interval of the image:
-13.119 -2.844 (delta_t = 10.275 [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 -2.844 sec. to 13.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08241 ( -0.108199 0.106993 )
Norm@50keV : 4.01584E-03 ( -0.000237989 0.000237835 )
------------------------------------------------------------
# Chi-Squared = 70.11 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.138782e-01
Photon flux (15-150 keV) in 16.14 sec: 0.465045 ( -0.0282389 0.0282916 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.81513e-07 ( -4.50214e-08 4.5258e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.844 sec. to 13.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.834192 ( -0.444048 0.324731 )
Epeak [keV] : 264.141 ( -264.137 -264.137 )
Norm@50keV : 5.20209E-03 ( -0.00134739 0.00291332 )
------------------------------------------------------------
# Chi-Squared = 69.03 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 56 degrees of freedom
# Null hypothesis probability = 1.133564e-01
Photon flux (15-150 keV) in 16.14 sec: 0.459290 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.71602e-07 ( -4.85523e-08 4.82328e-08 ) ergs/cm2
Band function
Time interval is from -2.844 sec. to 13.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.834201 ( 0.889896 0.889896 )
beta : -9.88512 ( 32.6958 42.6958 )
Epeak [keV] : 264.118 ( -130.604 -264.118 )
Norm@50keV : 5.20169E-03 ( -0.00245845 0.00344522 )
------------------------------------------------------------
# Chi-Squared = 69.03 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 55 degrees of freedom
# Null hypothesis probability = 9.666499e-02
Photon flux (15-150 keV) in 16.14 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 -0.284 sec. to 0.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.683870 ( -0.201809 0.190692 )
Norm@50keV : 9.20040E-03 ( -0.00109655 0.00108067 )
------------------------------------------------------------
# Chi-Squared = 53.82 using 59 PHA bins.
# Reduced chi-squared = 0.9442 for 57 degrees of freedom
# Null hypothesis probability = 5.952219e-01
Photon flux (15-150 keV) in 1 sec: 1.06489 ( -0.120095 0.120413 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13129e-07 ( -1.33243e-08 1.33996e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.284 sec. to 0.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.262655 ( )
Epeak [keV] : 143.202 ( -47.2789 770.035 )
Norm@50keV : 2.30336E-02 ( -0.0130374 0.0416055 )
------------------------------------------------------------
# Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9000 for 56 degrees of freedom
# Null hypothesis probability = 6.859428e-01
Photon flux (15-150 keV) in 1 sec: 1.02870 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08199e-07 ( -1.48653e-08 1.4573e-08 ) ergs/cm2
Band function
Time interval is from -0.284 sec. to 0.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -249370 -249370 )
beta : -1.11993 ( -0.193195 0.204167 )
Epeak [keV] : 53.6040 ( -53.6302 11.5015 )
Norm@50keV : 7.78153 ( -5.09899 646659 )
------------------------------------------------------------
# Chi-Squared = 51.29 using 59 PHA bins.
# Reduced chi-squared = 0.9325 for 55 degrees of freedom
# Null hypothesis probability = 6.172012e-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:
Wed Feb 2 01:04:58 EST 2011