batgrbproduct Analysis for Trigger=441676
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 Jan 7 13:10:17 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger441676/GCN5_download_cron
======================================================================
Trigger: 00441676 Segment: 000
BAT Trigger Time: 316041983.552 [s; MET]
Trigger Stop: 316041984.576 [s; MET]
UTC: 2011-01-06T21:26:17.013580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 134.195686538916 Dec: 46.9977905824713 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.63
Image Trigger?: NO
Rate S/N Ratio: 12.8062484748657 [ if not an image trigger ]
Image S/N Ratio: 7.63
Flight Position: [ source = BAT ]
RA: 134.195686538916 Dec: 46.9977905824713 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 134.164298616741 Dec: 47.0095708322205 [deg; J2000]
{ 08h 56m 39.4s , +47d 00' 34.5" }
+/- 1.22982362065374 [arcmin] (estimated 90% radius based on SNR)
+/- 0.514999656123268 [arcmin] (formal 1-sigma fit error)
SNR: 22.634529945485
Angular difference between Flight and Ground position is 1.465953 arcmin
Partial Coding Fraction: 0.375 [ including projection effects ]
Duration
T90: 43.4560000300407 +/- 16.6266176856008
Measured from: -22.4319998621941
to: 21.0240001678467 [s; relative to TRIGTIME]
T50: 14.8640000224113 +/- 1.33184983163053
Measured from: 0.240000128746033
to: 15.1040001511574 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.88400000333786
to: 5.88400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.4480000138283
to: 23.5040000081062 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.176777 1.320441 0.790124 0.233915
0.073641 0.075636 0.066287 0.056996 [error]
Peak 0.055378 0.095669 0.072141 0.008276
0.010690 0.011450 0.010140 0.008568 [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 3.83e-07 5.80e-07 6.58e-07 1.42e-06 2.05e-06 3.04e-06 erg/cm2
Error 4.03e-08 3.85e-08 6.67e-08 2.98e-07 1.55e-07 3.59e-07 erg/cm2
Peak flux Power-law 6.99e-01 6.85e-01 4.70e-01 5.06e-01 2.06e+00 2.36e+00 ph/cm2/s
Error 1.57e-01 9.80e-02 8.16e-02 1.75e-01 2.84e-01 3.24e-01 ph/cm2/s
Fluence Cutoff-PL 3.77e-07 5.91e-07 6.60e-07 1.09e-06 2.02e-06 2.71e-06 erg/cm2
Error 4.48e-08 4.79e-08 6.85e-08 6.01e-07 1.75e-07 5.09e-07 erg/cm2
Peak flux Cutoff-PL 5.76e-01 7.49e-01 5.12e-01 2.00e-01 1.98e+00 2.04e+00 ph/cm2/s
Error 1.96e-01 1.22e-01 9.79e-02 3.66e-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 1.818 0.123 - - 4.12e-03 3.05e-04 36.600 57
CPL 1.668 0.477 100.4 0.0 4.98e-03 0.00e+00 36.290 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 1.544 0.227 - - 1.63e-02 2.28e-03 43.050 57
CPL 0.514 1.164 72.9 302.6 5.32e-02 1.06e-01 40.110 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: 20.864000 sec.
T50 in the 50-300 keV band: 13.696000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 53.952 -30.448 23.504
T90 43.456 -22.432 21.024
T50 14.864 0.240 15.104
Peak 1.000 4.884 5.884
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
134.1643 +47.0096 0.0086 34.0 41.1 3.6724 22.6 TRIG_00441676
------------------------------------------
Foreground time interval of the image:
-30.448 23.504 (delta_t = 53.952 [sec])
Background time interval of the image:
-239.552 -30.448 (delta_t = 209.104 [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 -30.448 sec. to 23.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81821 ( -0.121812 0.124217 )
Norm@50keV : 4.12456E-03 ( -0.000306713 0.000303242 )
------------------------------------------------------------
# Chi-Squared = 36.60 using 59 PHA bins.
# Reduced chi-squared = 0.6422 for 57 degrees of freedom
# Null hypothesis probability = 9.837195e-01
Photon flux (15-150 keV) in 53.95 sec: 0.572418 ( -0.0385681 0.0386129 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.04736e-06 ( -1.53859e-07 1.55225e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.448 sec. to 23.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66774 ( -0.494067 0.459694 )
Epeak [keV] : 100.389 ( )
Norm@50keV : 4.98126E-03 ( )
------------------------------------------------------------
# Chi-Squared = 36.29 using 59 PHA bins.
# Reduced chi-squared = 0.6481 for 56 degrees of freedom
# Null hypothesis probability = 9.810364e-01
Photon flux (15-150 keV) in 53.95 sec: 0.568175 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01824e-06 ( -1.792e-07 1.70536e-07 ) ergs/cm2
Band function
Time interval is from -30.448 sec. to 23.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.47601 ( -1.45337 -1.45337 )
beta : -1.90143 ( -0.189332 0.167709 )
Epeak [keV] : 25.8700 ( -25.9236 62.3684 )
Norm@50keV : 1.24233 ( -1.14689 378.456 )
------------------------------------------------------------
# Chi-Squared = 34.73 using 59 PHA bins.
# Reduced chi-squared = 0.6315 for 55 degrees of freedom
# Null hypothesis probability = 9.851143e-01
Photon flux (15-150 keV) in 53.95 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 4.884 sec. to 5.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54450 ( -0.224178 0.229957 )
Norm@50keV : 1.62683E-02 ( -0.00228754 0.00226946 )
------------------------------------------------------------
# Chi-Squared = 43.05 using 59 PHA bins.
# Reduced chi-squared = 0.7553 for 57 degrees of freedom
# Null hypothesis probability = 9.142034e-01
Photon flux (15-150 keV) in 1 sec: 2.05621 ( -0.283718 0.284233 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53272e-07 ( -2.31064e-08 2.33626e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.884 sec. to 5.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.514461 ( -1.30817 1.02032 )
Epeak [keV] : 72.9315 ( -18.1701 587.053 )
Norm@50keV : 5.32296E-02 ( -0.0363765 0.175111 )
------------------------------------------------------------
# Chi-Squared = 40.11 using 59 PHA bins.
# Reduced chi-squared = 0.7163 for 56 degrees of freedom
# Null hypothesis probability = 9.460629e-01
Photon flux (15-150 keV) in 1 sec: 1.97502 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44631e-07 ( -2.4434e-08 2.5024e-08 ) ergs/cm2
Band function
Time interval is from 4.884 sec. to 5.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.518009 ( -0.71836 2.21655 )
beta : -3.04791 ( 2.98926 10.8135 )
Epeak [keV] : 72.6626 ( -22.0727 349.851 )
Norm@50keV : 5.30604E-02 ( -0.0362745 1.061 )
------------------------------------------------------------
# Chi-Squared = 40.10 using 59 PHA bins.
# Reduced chi-squared = 0.7292 for 55 degrees of freedom
# Null hypothesis probability = 9.342633e-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 Jan 7 13:38:33 EST 2011