batgrbproduct Analysis for Trigger=448229
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): Sat Mar 5 18:58:40 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger448229/GCN5_download_cron
======================================================================
Trigger: 00448229 Segment: 000
BAT Trigger Time: 320999887.936 [s; MET]
Trigger Stop: 320999892.032 [s; MET]
UTC: 2011-03-05T06:38:01.212340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 260.877330338745 Dec: -15.7900383779732 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.2
Image Trigger?: NO
Rate S/N Ratio: 13.9283882771841 [ if not an image trigger ]
Image S/N Ratio: 7.2
Flight Position: [ source = BAT ]
RA: 260.877330338745 Dec: -15.7900383779732 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 260.878183890648 Dec: -15.792711597242 [deg; J2000]
{ 17h 23m 30.8s , -15d 47' 33.8" }
+/- 1.9081449504161 [arcmin] (estimated 90% radius based on SNR)
+/- 0.932184444776246 [arcmin] (formal 1-sigma fit error)
SNR: 12.0849540971625
Angular difference between Flight and Ground position is 0.167793 arcmin
Partial Coding Fraction: 0.2226562 [ including projection effects ]
Duration
T90: 11.648000061512 +/- 2.51464829250303
Measured from: -0.271999895572662
to: 11.3760001659393 [s; relative to TRIGTIME]
T50: 5.61599999666214 +/- 1.25834172810177
Measured from: 1.63200014829636
to: 7.2480001449585 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.19600003957748
to: 7.19600003957748 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.751999974250793
to: 13.744000017643 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.375889 0.473553 0.364793 0.018247
0.048897 0.049114 0.043260 0.039189 [error]
Peak 0.058113 0.051705 0.052693 0.004758
0.012768 0.013270 0.011984 0.010265 [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 1.26e-07 2.10e-07 2.68e-07 6.82e-07 7.93e-07 1.29e-06 erg/cm2
Error 2.31e-08 2.41e-08 4.31e-08 2.31e-07 1.02e-07 2.68e-07 erg/cm2
Peak flux Power-law 5.21e-01 4.65e-01 2.86e-01 2.67e-01 1.39e+00 1.54e+00 ph/cm2/s
Error 1.96e-01 1.13e-01 9.91e-02 1.84e-01 3.34e-01 3.74e-01 ph/cm2/s
Fluence Cutoff-PL 1.21e-07 2.17e-07 2.71e-07 4.55e-07 7.77e-07 1.06e-06 erg/cm2
Error 1.97e-08 2.93e-08 4.54e-08 4.58e-07 1.11e-07 3.99e-07 erg/cm2
Peak flux Cutoff-PL 4.90e-01 4.83e-01 2.96e-01 2.22e-01 1.34e+00 1.45e+00 ph/cm2/s
Error 2.26e-01 1.33e-01 1.11e-01 4.26e-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 1.44e+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 1.653 0.202 - - 5.88e-03 7.08e-04 55.380 57
CPL 1.402 0.777 114.5 0.0 7.96e-03 0.00e+00 55.010 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 1.703 0.439 - - 1.04e-02 2.80e-03 52.900 57
CPL 1.348 1.448 90.6 0.0 1.59e-02 0.00e+00 52.730 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: 7.872000 sec.
T50 in the 50-300 keV band: 4.416000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 14.496 -0.752 13.744
T90 11.648 -0.272 11.376
T50 5.616 1.632 7.248
Peak 1.000 6.196 7.196
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
260.8782 -15.7927 0.0160 35.6 62.9 1.2660 12.1 TRIG_00448229
------------------------------------------
Foreground time interval of the image:
-0.752 13.744 (delta_t = 14.496 [sec])
Background time interval of the image:
-151.935 -132.996 (delta_t = 18.939 [sec])
-130.936 -0.752 (delta_t = 130.184 [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 -0.752 sec. to 13.744 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65317 ( -0.200059 0.204469 )
Norm@50keV : 5.88117E-03 ( -0.000712882 0.000703417 )
------------------------------------------------------------
# Chi-Squared = 55.38 using 59 PHA bins.
# Reduced chi-squared = 0.9716 for 57 degrees of freedom
# Null hypothesis probability = 5.359867e-01
Photon flux (15-150 keV) in 14.5 sec: 0.768739 ( -0.0880256 0.0881559 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.92856e-07 ( -1.01379e-07 1.02704e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.752 sec. to 13.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40186 ( -0.797826 0.755797 )
Epeak [keV] : 114.515 ( )
Norm@50keV : 7.96146E-03 ( )
------------------------------------------------------------
# Chi-Squared = 55.01 using 59 PHA bins.
# Reduced chi-squared = 0.9823 for 56 degrees of freedom
# Null hypothesis probability = 5.123054e-01
Photon flux (15-150 keV) in 14.5 sec: 0.760134 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.77058e-07 ( -1.10745e-07 1.10589e-07 ) ergs/cm2
Band function
Time interval is from -0.752 sec. to 13.744 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.40707 ( 1.25543 0.665063 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 2.97310 ( -2.9731 -2.9731 )
Norm@50keV : 2.33843E-19 ( -2.93417e-20 2.93417e-20 )
------------------------------------------------------------
# Chi-Squared = 98.40 using 59 PHA bins.
# Reduced chi-squared = 1.789 for 55 degrees of freedom
# Null hypothesis probability = 2.938287e-04
Photon flux (15-150 keV) in 14.5 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 6.196 sec. to 7.196 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70307 ( -0.417781 0.460485 )
Norm@50keV : 1.04189E-02 ( -0.00286056 0.00273208 )
------------------------------------------------------------
# Chi-Squared = 52.90 using 59 PHA bins.
# Reduced chi-squared = 0.9281 for 57 degrees of freedom
# Null hypothesis probability = 6.294258e-01
Photon flux (15-150 keV) in 1 sec: 1.38524 ( -0.333633 0.334087 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64438e-08 ( -2.67814e-08 2.75344e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34766 ( -1.9429 0.952498 )
Epeak [keV] : 90.5747 ( -90.2025 -90.2025 )
Norm@50keV : 1.58876E-02 ( )
------------------------------------------------------------
# Chi-Squared = 52.73 using 59 PHA bins.
# Reduced chi-squared = 0.9417 for 56 degrees of freedom
# Null hypothesis probability = 5.992535e-01
Photon flux (15-150 keV) in 1 sec: 1.34469 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.13538e-08 ( -2.74796e-08 2.79492e-08 ) ergs/cm2
Band function
Time interval is from 6.196 sec. to 7.196 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33852 ( 1.24193 1.86029 )
beta : -10.00000 ( 3.40041e+11 3.40041e+11 )
Epeak [keV] : 90.1922 ( -83.8599 -90.1922 )
Norm@50keV : 1.60343E-02 ( -0.0160346 0.122194 )
------------------------------------------------------------
# Chi-Squared = 52.73 using 59 PHA bins.
# Reduced chi-squared = 0.9588 for 55 degrees of freedom
# Null hypothesis probability = 5.616703e-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:
Sat Mar 5 19:36:48 EST 2011