batgrbproduct Analysis for Trigger=444912
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): Tue Feb 8 01:49:50 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger444912/GCN5_download_cron
======================================================================
Trigger: 00444912 Segment: 000
BAT Trigger Time: 318770246.656 [s; MET]
Trigger Stop: 318770246.72 [s; MET]
UTC: 2011-02-07T11:17:20.015680 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 12.5424372427686 Dec: -10.8057018983402 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 15.5884572681199 [ if not an image trigger ]
Image S/N Ratio: 7.39
Flight Position: [ source = BAT ]
RA: 12.5424372427686 Dec: -10.8057018983402 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 12.5396884248291 Dec: -10.789951793076 [deg; J2000]
{ 00h 50m 09.5s , -10d 47' 23.8" }
+/- 1.25036032929289 [arcmin] (estimated 90% radius based on SNR)
+/- 0.475490245309424 [arcmin] (formal 1-sigma fit error)
SNR: 22.1053138530787
Angular difference between Flight and Ground position is 0.958793 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 80.2719999551773 +/- 16.1610946513056
Measured from: 0.344000101089478
to: 80.6160000562668 [s; relative to TRIGTIME]
T50: 29.8839999437332 +/- 10.3430635775332
Measured from: 20.5480000972748
to: 50.432000041008 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.110000014305115
to: 0.889999985694885 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0879999995231628
to: 108.287999987602 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.611917 0.947984 0.699679 0.185822
0.049740 0.052715 0.049643 0.050433 [error]
Peak 0.035283 0.053658 0.039787 0.030311
0.005186 0.005786 0.005653 0.005425 [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 1.70e-07 3.53e-07 5.74e-07 2.10e-06 1.59e-06 3.20e-06 erg/cm2
Error 2.04e-08 2.47e-08 4.90e-08 4.05e-07 1.20e-07 4.38e-07 erg/cm2
Peak flux Power-law 2.72e-01 3.44e-01 3.17e-01 5.13e-01 1.11e+00 1.45e+00 ph/cm2/s
Error 6.60e-02 4.78e-02 4.64e-02 1.72e-01 1.31e-01 2.00e-01 ph/cm2/s
Fluence Cutoff-PL 1.70e-07 3.53e-07 5.75e-07 2.08e-06 1.59e-06 3.16e-06 erg/cm2
Error 2.17e-08 2.63e-08 3.72e-08 7.23e-07 1.11e-07 7.40e-07 erg/cm2
Peak flux Cutoff-PL 2.71e-01 3.44e-01 3.18e-01 5.09e-01 1.11e+00 1.44e+00 ph/cm2/s
Error 6.60e-02 4.78e-02 4.65e-02 1.99e-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 1.298 0.121 - - 1.48e-03 9.65e-05 67.040 57
CPL 1.295 0.000 10000.0 0.0 1.49e-03 9.71e-05 67.050 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 1.116 0.235 - - 9.53e-03 1.12e-03 70.170 57
CPL 1.112 0.300 10000.0 0.0 9.58e-03 1.13e-03 70.220 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: 37.568000 sec.
T50 in the 50-300 keV band: 20.096000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 108.376 -0.088 108.288
T90 80.272 0.344 80.616
T50 29.884 20.548 50.432
Peak 1.000 -0.110 0.890
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
12.5397 -10.7900 0.0087 14.4 -35.0 2.6700 22.1 TRIG_00444912
------------------------------------------
Foreground time interval of the image:
-0.088 108.288 (delta_t = 108.376 [sec])
Background time interval of the image:
-239.656 -0.088 (delta_t = 239.568 [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 -0.088 sec. to 108.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29835 ( -0.121273 0.120945 )
Norm@50keV : 1.48084E-03 ( -9.66577e-05 9.63181e-05 )
------------------------------------------------------------
# Chi-Squared = 67.04 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 57 degrees of freedom
# Null hypothesis probability = 1.705004e-01
Photon flux (15-150 keV) in 108.4 sec: 0.176614 ( -0.0115138 0.0115278 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58689e-06 ( -1.19758e-07 1.20988e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.088 sec. to 108.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29481 ( )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 1.48699E-03 ( -9.72683e-05 9.68849e-05 )
------------------------------------------------------------
# Chi-Squared = 67.05 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 56 degrees of freedom
# Null hypothesis probability = 1.481596e-01
Photon flux (15-150 keV) in 108.4 sec: 0.176548 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58715e-06 ( -1.20031e-07 1.01939e-07 ) ergs/cm2
Band function
Time interval is from -0.088 sec. to 108.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.802053 ( 0.860986 0.860986 )
beta : -1.35681 ( 1.35469 0.163748 )
Epeak [keV] : 83.1356 ( -83.2691 -83.2691 )
Norm@50keV : 3.02922E-03 ( -0.00303988 62.6892 )
------------------------------------------------------------
# Chi-Squared = 66.43 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 55 degrees of freedom
# Null hypothesis probability = 1.389177e-01
Photon flux (15-150 keV) in 108.4 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 -0.110 sec. to 0.890 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11551 ( -0.237053 0.232235 )
Norm@50keV : 9.53236E-03 ( -0.00112174 0.0011208 )
------------------------------------------------------------
# Chi-Squared = 70.17 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.129649e-01
Photon flux (15-150 keV) in 1 sec: 1.10741 ( -0.13114 0.131259 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.9173e-08 ( -1.40012e-08 1.42323e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.110 sec. to 0.890 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11159 ( -0.384664 0.216069 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 9.58137E-03 ( -0.00112898 0.0011276 )
------------------------------------------------------------
# Chi-Squared = 70.22 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 56 degrees of freedom
# Null hypothesis probability = 9.580010e-02
Photon flux (15-150 keV) in 1 sec: 1.10693 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.91633e-08 ( -1.40095e-08 1.42357e-08 ) ergs/cm2
Band function
Time interval is from -0.110 sec. to 0.890 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.920359 ( 0.920349 0.920349 )
beta : -1.11552 ( 1.11548 0.236938 )
Epeak [keV] : 53.7034 ( -53.699 -53.699 )
Norm@50keV : 1.59544E-02 ( -0.0075367 1.43179 )
------------------------------------------------------------
# Chi-Squared = 70.17 using 59 PHA bins.
# Reduced chi-squared = 1.276 for 55 degrees of freedom
# Null hypothesis probability = 8.170457e-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:
Tue Feb 8 02:07:32 EST 2011