batgrbproduct Analysis for Trigger=440955
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 Dec 24 12:03:08 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger440955/GCN5_download_cron
======================================================================
Trigger: 00440955 Segment: 000
BAT Trigger Time: 314861240.256 [s; MET]
Trigger Stop: 314861240.512 [s; MET]
UTC: 2010-12-24T05:27:13.761240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 285.926038610832 Dec: 45.7154744502681 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.17
Image Trigger?: NO
Rate S/N Ratio: 18.4661853126194 [ if not an image trigger ]
Image S/N Ratio: 9.17
Flight Position: [ source = BAT ]
RA: 285.926038610832 Dec: 45.7154744502681 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 285.939198236669 Dec: 45.7061261540905 [deg; J2000]
{ 19h 03m 45.4s , +45d 42' 22.1" }
+/- 2.0969905241259 [arcmin] (estimated 90% radius based on SNR)
+/- 0.904354119030324 [arcmin] (formal 1-sigma fit error)
SNR: 10.5607522473335
Angular difference between Flight and Ground position is 0.786504 arcmin
Partial Coding Fraction: 0.5390625 [ including projection effects ]
Duration
T90: 0.24399995803833 +/- 0.042520585314364
Measured from: 0.03600013256073
to: 0.28000009059906 [s; relative to TRIGTIME]
T50: 0.135999977588654 +/- 0.033941109986914
Measured from: 0.0880001187324524
to: 0.224000096321106 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.337999999523163
to: 0.662000000476837 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0239999890327454
to: 0.296000003814697 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.008104 0.031048 0.039610 0.017655
0.004591 0.005383 0.005129 0.003901 [error]
Peak 0.008693 0.036583 0.036459 0.016314
0.007933 0.008644 0.007795 0.006652 [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 4.42e-09 1.07e-08 2.08e-08 9.91e-08 5.63e-08 1.35e-07 erg/cm2
Error 1.49e-09 2.38e-09 4.06e-09 3.79e-08 1.08e-08 4.05e-08 erg/cm2
Peak flux Power-law 1.16e-01 1.88e-01 2.30e-01 5.53e-01 6.92e-01 1.09e+00 ph/cm2/s
Error 7.37e-02 7.44e-02 5.95e-02 3.18e-01 1.94e-01 3.24e-01 ph/cm2/s
Fluence Cutoff-PL 2.38e-09 1.15e-08 2.74e-08 2.73e-08 5.80e-08 6.87e-08 erg/cm2
Error 1.68e-09 3.19e-09 5.94e-09 2.19e-08 1.13e-08 2.34e-08 erg/cm2
Peak flux Cutoff-PL 9.65e-02 1.93e-01 2.49e-01 3.03e-01 6.79e-01 8.43e-01 ph/cm2/s
Error 8.27e-02 8.35e-02 7.68e-02 4.37e-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 1.047 0.262 - - 1.95e-02 3.71e-03 71.580 57
CPL -0.930 1.520 95.7 35.2 1.18e-01 2.10e-01 62.850 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 0.711 0.485 - - 5.99e-03 1.79e-03 45.320 57
CPL 0.050 1.297 176.2 0.0 1.15e-02 6.48e-02 44.900 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.272 0.024 0.296
T90 0.244 0.036 0.280
T50 0.136 0.088 0.224
Peak 1.000 -0.338 0.662
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
285.9392 +45.7061 0.0183 27.1 47.5 0.1031 10.6 TRIG_00440955
------------------------------------------
Foreground time interval of the image:
0.024 0.296 (delta_t = 0.272 [sec])
Background time interval of the image:
-239.256 -223.306 (delta_t = 15.950 [sec])
-222.256 -124.586 (delta_t = 97.670 [sec])
-123.256 0.024 (delta_t = 123.280 [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 0.024 sec. to 0.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04716 ( -0.265947 0.258686 )
Norm@50keV : 1.94561E-02 ( -0.00372016 0.00370065 )
------------------------------------------------------------
# Chi-Squared = 71.58 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 57 degrees of freedom
# Null hypothesis probability = 9.253359e-02
Photon flux (15-150 keV) in 0.272 sec: 2.24649 ( -0.437811 0.440385 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63059e-08 ( -1.07809e-08 1.08132e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.024 sec. to 0.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.929998 ( -1.8048 1.23545 )
Epeak [keV] : 95.7414 ( -19.8287 50.638 )
Norm@50keV : 0.118314 ( -0.077395 0.3424 )
------------------------------------------------------------
# Chi-Squared = 62.85 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.466233e-01
Photon flux (15-150 keV) in 0.272 sec: 2.17734 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.79572e-08 ( -1.12904e-08 1.12594e-08 ) ergs/cm2
Band function
Time interval is from 0.024 sec. to 0.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.927875 ( -0.94459 2.96307 )
beta : -10.00000 ( 4.88734e+10 4.88734e+10 )
Epeak [keV] : 95.7438 ( -19.8038 50.6636 )
Norm@50keV : 0.118182 ( -0.077495 0.343157 )
------------------------------------------------------------
# Chi-Squared = 62.85 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.181055e-01
Photon flux (15-150 keV) in 0.272 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 -0.338 sec. to 0.662 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.710690 ( -0.528593 0.441991 )
Norm@50keV : 5.99045E-03 ( -0.00184305 0.00174662 )
------------------------------------------------------------
# Chi-Squared = 45.32 using 59 PHA bins.
# Reduced chi-squared = 0.7951 for 57 degrees of freedom
# Null hypothesis probability = 8.676626e-01
Photon flux (15-150 keV) in 1 sec: 0.691853 ( -0.192537 0.196158 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.27703e-08 ( -1.92657e-08 1.93674e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.338 sec. to 0.662 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.04922E-02 ( -2.64244 -0.0482796 )
Epeak [keV] : 176.171 ( -176.055 -176.055 )
Norm@50keV : 1.14957E-02 ( -0.0115067 0.118117 )
------------------------------------------------------------
# Chi-Squared = 44.90 using 59 PHA bins.
# Reduced chi-squared = 0.8019 for 56 degrees of freedom
# Null hypothesis probability = 8.560789e-01
Photon flux (15-150 keV) in 1 sec: 0.678959 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.09485e-08 ( -2.12473e-08 2.0172e-08 ) ergs/cm2
Band function
Time interval is from -0.338 sec. to 0.662 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99639 ( -531.575 -531.575 )
beta : -0.951496 ( -1.13756 0.619382 )
Epeak [keV] : 37.9427 ( -37.8487 33.308 )
Norm@50keV : 35.1222 ( -35.685 648434 )
------------------------------------------------------------
# Chi-Squared = 43.68 using 59 PHA bins.
# Reduced chi-squared = 0.7942 for 55 degrees of freedom
# Null hypothesis probability = 8.640594e-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:
Fri Dec 24 12:20:09 EST 2010