batgrbproduct Analysis for Trigger=442039
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 Jan 12 20:18:19 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger442039/GCN5_download_cron
======================================================================
Trigger: 00442039 Segment: 000
BAT Trigger Time: 316498345.024 [s; MET]
Trigger Stop: 316498345.536 [s; MET]
UTC: 2011-01-12T04:12:18.468660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 329.940686625488 Dec: 26.4889696785716 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 8.12403840463596 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 329.940686625488 Dec: 26.4889696785716 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 329.935563594792 Dec: 26.4740837975875 [deg; J2000]
{ 21h 59m 44.5s , +26d 28' 26.7" }
+/- 2.64478845233886 [arcmin] (estimated 90% radius based on SNR)
+/- 1.51401483391242 [arcmin] (formal 1-sigma fit error)
SNR: 7.58058551669583
Angular difference between Flight and Ground position is 0.934569 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 0.523999989032745 +/- 0.147187001532429
Measured from: -0.0639998912811279
to: 0.460000097751617 [s; relative to TRIGTIME]
T50: 0.215999960899353 +/- 0.176816301981189
Measured from: 0.0720001459121704
to: 0.288000106811523 [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: -0.0719999670982361
to: 0.504000008106232 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.023471 0.025392 0.010927 0.005676
0.005194 0.005147 0.004621 0.004292 [error]
Peak 0.022932 0.025816 0.011854 0.002447
0.006641 0.006630 0.005982 0.005641 [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 7.37e-09 9.21e-09 8.38e-09 1.33e-08 2.95e-08 3.82e-08 erg/cm2
Error 2.17e-09 2.33e-09 3.82e-09 1.17e-08 9.00e-09 1.67e-08 erg/cm2
Peak flux Power-law 2.07e-01 1.69e-01 9.33e-02 7.57e-02 5.04e-01 5.46e-01 ph/cm2/s
Error 8.50e-02 5.17e-02 4.45e-02 8.22e-02 1.54e-01 1.72e-01 ph/cm2/s
Fluence Cutoff-PL 6.90e-09 1.10e-08 6.81e-09 1.23e-09 2.58e-08 2.59e-08 erg/cm2
Error 2.43e-09 3.41e-09 4.90e-09 1.07e-08 8.93e-09 1.56e-08 erg/cm2
Peak flux Cutoff-PL 1.76e-01 2.17e-01 7.78e-02 5.11e-03 4.76e-01 4.77e-01 ph/cm2/s
Error 9.74e-02 7.82e-02 6.02e-02 1.53e-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 2.137 0.458 - - 5.49e-03 1.86e-03 49.060 57
CPL 0.593 2.724 33.9 0.0 4.98e-02 5.20e+00 47.370 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 1.857 0.533 - - 3.57e-03 1.33e-03 74.260 57
CPL -0.318 4.125 41.3 0.0 7.33e-02 0.00e+00 71.900 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.576 -0.072 0.504
T90 0.524 -0.064 0.460
T50 0.216 0.072 0.288
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
329.9356 +26.4741 0.0255 18.9 147.7 0.0673 7.6 TRIG_00442039
------------------------------------------
Foreground time interval of the image:
-0.072 0.504 (delta_t = 0.576 [sec])
Background time interval of the image:
-239.024 -116.824 (delta_t = 122.200 [sec])
-116.024 -0.072 (delta_t = 115.952 [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 -0.072 sec. to 0.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13731 ( -0.421276 0.495071 )
Norm@50keV : 5.48919E-03 ( -0.0018897 0.00183803 )
------------------------------------------------------------
# Chi-Squared = 49.06 using 59 PHA bins.
# Reduced chi-squared = 0.8607 for 57 degrees of freedom
# Null hypothesis probability = 7.636064e-01
Photon flux (15-150 keV) in 0.576 sec: 0.879989 ( -0.208449 0.208584 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94986e-08 ( -8.68481e-09 9.31006e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.072 sec. to 0.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.593184 ( -3.55599 1.89127 )
Epeak [keV] : 33.9035 ( -33.9273 -33.9273 )
Norm@50keV : 4.98486E-02 ( -0.0513811 10.3582 )
------------------------------------------------------------
# Chi-Squared = 47.37 using 59 PHA bins.
# Reduced chi-squared = 0.8459 for 56 degrees of freedom
# Null hypothesis probability = 7.874116e-01
Photon flux (15-150 keV) in 0.576 sec: 0.852363 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57741e-08 ( -7.75682e-09 1.01008e-08 ) ergs/cm2
Band function
Time interval is from -0.072 sec. to 0.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.580726 ( 0.954639 3.92222 )
beta : -10.00000 ( 8.22858e+07 8.22858e+07 )
Epeak [keV] : 33.8935 ( -28.4073 -33.9019 )
Norm@50keV : 5.08664E-02 ( -0.0514258 8.56604 )
------------------------------------------------------------
# Chi-Squared = 47.37 using 59 PHA bins.
# Reduced chi-squared = 0.8613 for 55 degrees of freedom
# Null hypothesis probability = 7.579103e-01
Photon flux (15-150 keV) in 0.576 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: 1.85743 ( -0.500937 0.564951 )
Norm@50keV : 3.57143E-03 ( -0.00135426 0.00131527 )
------------------------------------------------------------
# Chi-Squared = 74.26 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.198699e-02
Photon flux (15-150 keV) in 1 sec: 0.503573 ( -0.153633 0.15365 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28406e-08 ( -1.18433e-08 1.2767e-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: -0.318462 ( -5.84261 2.40781 )
Epeak [keV] : 41.2664 ( )
Norm@50keV : 7.33285E-02 ( )
------------------------------------------------------------
# Chi-Squared = 71.90 using 59 PHA bins.
# Reduced chi-squared = 1.284 for 56 degrees of freedom
# Null hypothesis probability = 7.475229e-02
Photon flux (15-150 keV) in 1 sec: 0.476478 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67873e-08 ( -9.7779e-09 1.33368e-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 : 0.318215 ( 0.968499 0.968499 )
beta : -10.00000 ( 1.22582e+08 1.22582e+08 )
Epeak [keV] : 41.2473 ( -36.9495 -40.8492 )
Norm@50keV : 7.33459E-02 ( -0.0964107 24.1159 )
------------------------------------------------------------
# Chi-Squared = 71.90 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 55 degrees of freedom
# Null hypothesis probability = 6.265866e-02
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 Jan 12 20:38:53 EST 2011