batgrbproduct Analysis for Trigger=442771
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 19 07:49:18 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger442771/GCN5_download_cron
======================================================================
Trigger: 00442771 Segment: 000
BAT Trigger Time: 317064719.232 [s; MET]
Trigger Stop: 317064720.256 [s; MET]
UTC: 2011-01-18T17:31:52.655520 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 2.37186525275243 Dec: -41.0928976101438 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.53
Image Trigger?: NO
Rate S/N Ratio: 7.14142842854285 [ if not an image trigger ]
Image S/N Ratio: 6.53
Flight Position: [ source = BAT ]
RA: 2.37186525275243 Dec: -41.0928976101438 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 2.33961731392122 Dec: -40.9790664672957 [deg; J2000]
{ 00h 09m 21.5s , -40d 58' 44.6" }
+/- 4.32631205852656 [arcmin] (estimated 90% radius based on SNR)
+/- 2.93941796305425 [arcmin] (formal 1-sigma fit error)
SNR: 3.75300035607372
Angular difference between Flight and Ground position is 6.984065 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: -2.98023223876953e-08
to: 1.02399995923042 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.004181 -0.004859 0.026898 0.026637
0.006140 0.006976 0.006959 0.007872 [error]
Peak -0.004181 -0.004859 0.026898 0.026637
0.006140 0.006976 0.006959 0.007872 [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 1.07e-10 1.08e-09 9.78e-09 5.82e-07 3.99e-08 5.94e-07 erg/cm2
Error 3.18e-10 1.64e-09 8.28e-09 4.98e-07 2.06e-08 5.03e-07 erg/cm2
Peak flux Power-law 3.21e-03 1.68e-02 7.61e-02 1.41e+00 2.35e-01 1.52e+00 ph/cm2/s
Error 9.66e-03 2.65e-02 6.59e-02 9.30e-01 1.35e-01 9.18e-01 ph/cm2/s
Fluence Cutoff-PL 9.25e-11 9.90e-10 9.57e-09 6.27e-07 4.02e-08 6.37e-07 erg/cm2
Error 3.04e-10 1.62e-09 8.25e-09 5.61e-07 2.08e-08 5.67e-07 erg/cm2
Peak flux Cutoff-PL 1.55e-03 1.17e-02 7.23e-02 1.37e+00 2.35e-01 1.60e+00 ph/cm2/s
Error 8.98e-03 2.54e-02 7.14e-02 0.00e+00 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 -1.178 0.945 - - 9.44e-04 1.14e-03 73.930 57
CPL -2.260 0.000 506.2 0.0 1.11e-03 6.21e-03 73.680 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 -1.178 0.945 - - 9.44e-04 1.14e-03 73.930 57
CPL -2.260 0.000 506.2 0.0 1.11e-03 6.21e-03 73.680 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
2.3396 -40.9791 0.0511 23.0 168.6 0.0555 3.8 TRIG_00442771
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.232 -7.232 (delta_t = 53.000 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.17774 ( -0.793099 1.09719 )
Norm@50keV : 9.44116E-04 ( -0.000942832 0.00133337 )
------------------------------------------------------------
# Chi-Squared = 73.93 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 57 degrees of freedom
# Null hypothesis probability = 6.526663e-02
Photon flux (15-150 keV) in 1.024 sec: 0.235089 ( -0.138509 0.131278 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99176e-08 ( -2.22347e-08 1.89697e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.25994 ( )
Epeak [keV] : 506.200 ( -509.16 -509.16 )
Norm@50keV : 1.10585E-03 ( -0.00110288 0.0113146 )
------------------------------------------------------------
# Chi-Squared = 73.68 using 59 PHA bins.
# Reduced chi-squared = 1.316 for 56 degrees of freedom
# Null hypothesis probability = 5.668013e-02
Photon flux (15-150 keV) in 1.024 sec: 0.235158 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01721e-08 ( -2.26008e-08 1.8945e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.35882 ( -2.31166 -2.31166 )
beta : 0.864390 ( -1.06018 0.886786 )
Epeak [keV] : 173.192 ( -173.111 9805.03 )
Norm@50keV : 4.63425E-03 ( -0.00462173 0.024678 )
------------------------------------------------------------
# Chi-Squared = 73.50 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 55 degrees of freedom
# Null hypothesis probability = 4.851221e-02
Photon flux (15-150 keV) in 1.024 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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.17774 ( -0.793099 1.09719 )
Norm@50keV : 9.44116E-04 ( -0.000942832 0.00133337 )
------------------------------------------------------------
# Chi-Squared = 73.93 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 57 degrees of freedom
# Null hypothesis probability = 6.526663e-02
Photon flux (15-150 keV) in 1.024 sec: 0.235089 ( -0.138509 0.131278 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.99176e-08 ( -2.22347e-08 1.89697e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.25994 ( )
Epeak [keV] : 506.200 ( -509.16 -509.16 )
Norm@50keV : 1.10585E-03 ( -0.00110288 0.0113146 )
------------------------------------------------------------
# Chi-Squared = 73.68 using 59 PHA bins.
# Reduced chi-squared = 1.316 for 56 degrees of freedom
# Null hypothesis probability = 5.668013e-02
Photon flux (15-150 keV) in 1.024 sec: 0.235158 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.01721e-08 ( -2.26008e-08 1.8945e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.35882 ( -2.31166 -2.31166 )
beta : 0.864390 ( -1.06018 0.886786 )
Epeak [keV] : 173.192 ( -173.111 9805.02 )
Norm@50keV : 4.63425E-03 ( -0.00462173 0.024678 )
------------------------------------------------------------
# Chi-Squared = 73.50 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 55 degrees of freedom
# Null hypothesis probability = 4.851221e-02
Photon flux (15-150 keV) in 1.024 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 19 08:13:36 EST 2011