batgrbproduct Analysis for Trigger=446677
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 Feb 24 18:08:39 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger446677/GCN5_download_cron
======================================================================
Trigger: 00446677 Segment: 000
BAT Trigger Time: 320189154.752 [s; MET]
Trigger Stop: 320189156.8 [s; MET]
UTC: 2011-02-23T21:25:48.058640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 150.275688090159 Dec: -68.3291791093942 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.1
Image Trigger?: NO
Rate S/N Ratio: 15.5884572681199 [ if not an image trigger ]
Image S/N Ratio: 7.1
Flight Position: [ source = BAT ]
RA: 150.275688090159 Dec: -68.3291791093942 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 150.308501700927 Dec: -68.3109089773887 [deg; J2000]
{ 10h 01m 14.0s , -68d 18' 39.3" }
+/- 1.74675024188164 [arcmin] (estimated 90% radius based on SNR)
+/- 0.866763850191704 [arcmin] (formal 1-sigma fit error)
SNR: 13.7111651763171
Angular difference between Flight and Ground position is 1.315550 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 62.1159999370575 +/- 8.72168355712865
Measured from: -44.8439998626709
to: 17.2720000743866 [s; relative to TRIGTIME]
T50: 29.5399999022484 +/- 8.46548995174556
Measured from: -28.8319998383522
to: 0.708000063896179 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.992000043392181
to: 1.99200004339218 [s; relative to TRIGTIME]
Total Fluence
Measured from: -45.7919999957085
to: 19.8800000548363 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.383397 0.379688 0.253221 0.082043
0.038948 0.039646 0.035093 0.031050 [error]
Peak 0.019649 0.015313 0.034850 0.005079
0.005144 0.005388 0.004854 0.004080 [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 9.66e-08 1.61e-07 2.04e-07 5.14e-07 6.04e-07 9.75e-07 erg/cm2
Error 1.69e-08 1.73e-08 3.48e-08 1.87e-07 8.01e-08 2.17e-07 erg/cm2
Peak flux Power-law 1.39e-01 1.80e-01 1.71e-01 2.88e-01 5.86e-01 7.77e-01 ph/cm2/s
Error 5.90e-02 4.49e-02 3.83e-02 1.50e-01 1.19e-01 1.70e-01 ph/cm2/s
Fluence Cutoff-PL 9.66e-08 1.61e-07 2.04e-07 5.10e-07 6.04e-07 9.71e-07 erg/cm2
Error 1.69e-08 1.74e-08 3.49e-08 1.85e-07 8.01e-08 2.16e-07 erg/cm2
Peak flux Cutoff-PL 1.38e-01 1.80e-01 1.71e-01 2.86e-01 5.85e-01 7.75e-01 ph/cm2/s
Error 5.89e-02 4.49e-02 3.84e-02 1.69e-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 1.38e-01 7.70e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 1.69e-01 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 1.661 0.211 - - 1.03e-03 1.26e-04 57.090 57
CPL 1.677 0.213 9999.4 0.0 1.03e-03 0.00e+00 57.110 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 1.073 0.387 - - 5.06e-03 9.98e-04 67.980 57
CPL 1.063 0.833 9999.4 0.0 5.09e-03 5.83e-03 67.980 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: 1.856000 sec.
T50 in the 50-300 keV band: 1.024000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 65.672 -45.792 19.880
T90 62.116 -44.844 17.272
T50 29.540 -28.832 0.708
Peak 1.000 0.992 1.992
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
150.3085 -68.3109 0.0140 8.6 173.3 1.0325 13.7 TRIG_00446677
------------------------------------------
Foreground time interval of the image:
-45.792 -12.462 (delta_t = 33.330 [sec])
-11.752 -11.402 (delta_t = 0.350 [sec])
-10.752 12.128 (delta_t = 22.880 [sec])
13.248 19.880 (delta_t = 6.632 [sec])
Background time interval of the image:
-239.752 -56.628 (delta_t = 183.124 [sec])
-55.752 -45.792 (delta_t = 9.960 [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
Multiple GTIs in the spectrum
tstart tstop
-45.792000 -12.462000
-11.751900 -11.402000
-10.752000 12.128000
13.248000 19.880000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66101 ( -0.20788 0.213634 )
Norm@50keV : 1.02934E-03 ( -0.000127316 0.00012413 )
------------------------------------------------------------
# Chi-Squared = 57.09 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.718294e-01
Photon flux (15-150 keV) in 63.19 sec: 0.134898 ( -0.0145176 0.0145263 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04278e-07 ( -7.93003e-08 8.09287e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-45.792000 -12.462000
-11.751900 -11.402000
-10.752000 12.128000
13.248000 19.880000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67715 ( -0.226248 0.199245 )
Epeak [keV] : 9999.35 ( )
Norm@50keV : 1.02557E-03 ( )
------------------------------------------------------------
# Chi-Squared = 57.11 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 56 degrees of freedom
# Null hypothesis probability = 4.334712e-01
Photon flux (15-150 keV) in 63.19 sec: 0.134844 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.04182e-07 ( -7.93091e-08 8.09363e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-45.792000 -12.462000
-11.751900 -11.402000
-10.752000 12.128000
13.248000 19.880000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26986 ( 1.26986 1.26986 )
beta : -1.66199 ( 1.66199 0.208616 )
Epeak [keV] : 30.7664 ( -30.7664 -30.7664 )
Norm@50keV : 2.35165E-03 ( -0.00235165 5.40135 )
------------------------------------------------------------
# Chi-Squared = 57.08 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.975686e-01
Photon flux (15-150 keV) in 63.19 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 0.992 sec. to 1.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07319 ( -0.39303 0.380062 )
Norm@50keV : 5.06029E-03 ( -0.000999746 0.000995544 )
------------------------------------------------------------
# Chi-Squared = 67.98 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 57 degrees of freedom
# Null hypothesis probability = 1.514616e-01
Photon flux (15-150 keV) in 1 sec: 0.585524 ( -0.118681 0.119111 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.33714e-08 ( -1.17073e-08 1.18251e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.992 sec. to 1.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06350 ( -1.28044 0.386265 )
Epeak [keV] : 9999.36 ( -9993.79 -9993.79 )
Norm@50keV : 5.08653E-03 ( -0.000995731 0.0106592 )
------------------------------------------------------------
# Chi-Squared = 67.98 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 56 degrees of freedom
# Null hypothesis probability = 1.308403e-01
Photon flux (15-150 keV) in 1 sec: 0.585284 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.33856e-08 ( -1.1703e-08 1.18343e-08 ) ergs/cm2
Band function
Time interval is from 0.992 sec. to 1.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.912286 ( 0.91226 0.91226 )
beta : -1.07321 ( 1.07318 0.393019 )
Epeak [keV] : 41.3738 ( -41.3769 -41.3769 )
Norm@50keV : 8.33381E-03 ( -0.00833369 7365.89 )
------------------------------------------------------------
# Chi-Squared = 67.98 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 55 degrees of freedom
# Null hypothesis probability = 1.123783e-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:
Thu Feb 24 18:21:33 EST 2011