batgrbproduct Analysis for Trigger=442978
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): Thu Jan 20 11:15:51 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger442978/GCN5_download_cron
======================================================================
Trigger: 00442978 Segment: 000
BAT Trigger Time: 317168464.96 [s; MET]
Trigger Stop: 317168465.472 [s; MET]
UTC: 2011-01-19T22:20:58.379640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 348.557715071903 Dec: 5.98467449193536 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.81
Image Trigger?: NO
Rate S/N Ratio: 17.7200451466693 [ if not an image trigger ]
Image S/N Ratio: 8.81
Flight Position: [ source = BAT ]
RA: 348.557715071903 Dec: 5.98467449193536 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 348.588390353107 Dec: 5.9816313931839 [deg; J2000]
{ 23h 14m 21.2s , +05d 58' 53.9" }
+/- 1.45617918244204 [arcmin] (estimated 90% radius based on SNR)
+/- 0.792750476574009 [arcmin] (formal 1-sigma fit error)
SNR: 17.780925165862
Angular difference between Flight and Ground position is 1.839574 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 214.411999940872 +/- 12.8412573951228
Measured from: -9.22399985790253
to: 205.18800008297 [s; relative to TRIGTIME]
T50: 110.95199996233 +/- 44.3057033056932
Measured from: 17.5560001134872
to: 128.508000075817 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 33.160000026226
to: 34.160000026226 [s; relative to TRIGTIME]
Total Fluence
Measured from: -86.4399999976158
to: 215.516000032425 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.035476 4.305743 3.259926 0.857118
0.088537 0.092398 0.083921 0.076121 [error]
Peak 0.055132 0.091291 0.110615 0.045475
0.005731 0.006461 0.006626 0.005241 [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 8.89e-07 1.69e-06 2.48e-06 7.82e-06 7.03e-06 1.29e-05 erg/cm2
Error 4.89e-08 5.27e-08 8.62e-08 6.32e-07 2.08e-07 6.78e-07 erg/cm2
Peak flux Power-law 4.24e-01 6.27e-01 6.92e-01 1.44e+00 2.18e+00 3.18e+00 ph/cm2/s
Error 6.17e-02 5.45e-02 4.98e-02 2.33e-01 1.48e-01 2.54e-01 ph/cm2/s
Fluence Cutoff-PL 8.55e-07 1.71e-06 2.51e-06 6.09e-06 6.93e-06 1.12e-05 erg/cm2
Error 6.30e-08 5.72e-08 9.34e-08 1.58e-06 2.38e-07 1.47e-06 erg/cm2
Peak flux Cutoff-PL 4.24e-01 6.27e-01 6.93e-01 1.43e+00 2.18e+00 3.17e+00 ph/cm2/s
Error 6.17e-02 5.46e-02 4.98e-02 2.53e-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 1.444 0.053 - - 2.43e-03 6.61e-05 46.410 57
CPL 1.246 0.209 202.9 -64.4 3.00e-03 6.40e-04 44.460 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 0.858 0.122 - - 1.90e-02 1.29e-03 64.090 57
CPL 0.851 0.152 10000.0 0.0 1.91e-02 1.30e-03 64.080 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: 203.712000 sec.
T50 in the 50-300 keV band: 56.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 301.956 -86.440 215.516
T90 214.412 -9.224 205.188
T50 110.952 17.556 128.508
Peak 1.000 33.160 34.160
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
348.5884 +5.9816 0.0109 10.0 -119.8 1.9853 17.8 TRIG_00442978
------------------------------------------
Foreground time interval of the image:
-86.440 10.741 (delta_t = 97.181 [sec])
Background time interval of the image:
-239.960 -86.440 (delta_t = 153.520 [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 -86.440 sec. to 215.516 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44405 ( -0.0532848 0.0533015 )
Norm@50keV : 2.42892E-03 ( -6.61165e-05 6.60999e-05 )
------------------------------------------------------------
# Chi-Squared = 46.41 using 59 PHA bins.
# Reduced chi-squared = 0.8143 for 57 degrees of freedom
# Null hypothesis probability = 8.406074e-01
Photon flux (15-150 keV) in 302 sec: 0.298891 ( -0.00875413 0.00877636 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.02715e-06 ( -2.08016e-07 2.08603e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -86.440 sec. to 215.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24584 ( -0.196091 0.222132 )
Epeak [keV] : 202.867 ( -77.025 -205.886 )
Norm@50keV : 3.00496E-03 ( -0.000585931 0.000693863 )
------------------------------------------------------------
# Chi-Squared = 44.46 using 59 PHA bins.
# Reduced chi-squared = 0.7939 for 56 degrees of freedom
# Null hypothesis probability = 8.668807e-01
Photon flux (15-150 keV) in 302 sec: 0.294988 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.92906e-06 ( -2.39275e-07 2.36979e-07 ) ergs/cm2
Band function
Time interval is from -86.440 sec. to 215.516 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.21950 ( -1.33584 -0.453116 )
beta : -1.49114 ( -0.0825362 0.0666243 )
Epeak [keV] : 32.4554 ( -11.4858 88.7601 )
Norm@50keV : 0.190104 ( -0.190104 64.1443 )
------------------------------------------------------------
# Chi-Squared = 41.21 using 59 PHA bins.
# Reduced chi-squared = 0.7494 for 55 degrees of freedom
# Null hypothesis probability = 9.159966e-01
Photon flux (15-150 keV) in 302 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 33.160 sec. to 34.160 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.857766 ( -0.122923 0.120674 )
Norm@50keV : 1.90060E-02 ( -0.00129338 0.00128861 )
------------------------------------------------------------
# Chi-Squared = 64.09 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.418818e-01
Photon flux (15-150 keV) in 1 sec: 2.18154 ( -0.147521 0.14769 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16888e-07 ( -1.61149e-08 1.62104e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.160 sec. to 34.160 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.850895 ( -0.16782 0.135484 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 1.91364E-02 ( -0.00129918 0.00129477 )
------------------------------------------------------------
# Chi-Squared = 64.08 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 56 degrees of freedom
# Null hypothesis probability = 2.140833e-01
Photon flux (15-150 keV) in 1 sec: 2.18095 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16505e-07 ( -1.5681e-08 1.5579e-08 ) ergs/cm2
Band function
Time interval is from 33.160 sec. to 34.160 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99999 ( -171148 -171148 )
beta : -0.867992 ( -0.121083 0.123267 )
Epeak [keV] : 22.2025 ( -22.2025 7.78455 )
Norm@50keV : 2225.14 ( -1830.58 2.01485e+06 )
------------------------------------------------------------
# Chi-Squared = 63.79 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 55 degrees of freedom
# Null hypothesis probability = 1.948806e-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:
Thu Jan 20 11:32:17 EST 2011