batgrbproduct Analysis for Trigger=421124
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Wed May 5 11:25:54 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger421124/GCN5_download_cron
======================================================================
Trigger: 00421124 Segment: 000
BAT Trigger Time: 294693665.28 [s; MET]
Trigger Stop: 294693666.304 [s; MET]
UTC: 2010-05-04T19:20:59.512540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.572346509643 Dec: -35.598882010796 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.86
Image Trigger?: NO
Rate S/N Ratio: 22.494443758404 [ if not an image trigger ]
Image S/N Ratio: 12.86
Flight Position: [ source = BAT ]
RA: 255.572346509643 Dec: -35.598882010796 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.575414158208 Dec: -35.5897522340652 [deg; J2000]
{ 17h 02m 18.1s , -35d 35' 23.1" }
+/- 0.811933566647732 [arcmin] (estimated 90% radius based on SNR)
+/- 0.212243827537732 [arcmin] (formal 1-sigma fit error)
SNR: 40.9614020942021
Angular difference between Flight and Ground position is 0.567865 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 97.8839999437332 +/- 7.69085615292811
Measured from: -6.06399983167648
to: 91.8200001120567 [s; relative to TRIGTIME]
T50: 14.0399999022484 +/- 4.30408785000017
Measured from: 0.764000177383423
to: 14.8040000796318 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.60000002384186
to: 8.60000002384186 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.69599997997284
to: 105.660000026226 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.467891 1.576486 0.970483 0.144075
0.071690 0.066248 0.058858 0.058283 [error]
Peak 0.060364 0.078699 0.052191 0.010095
0.007441 0.007157 0.006494 0.005693 [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 4.22e-07 6.59e-07 7.73e-07 1.75e-06 2.37e-06 3.61e-06 erg/cm2
Error 3.71e-08 3.36e-08 5.97e-08 2.94e-07 1.35e-07 3.39e-07 erg/cm2
Peak flux Power-law 6.02e-01 5.60e-01 3.61e-01 3.59e-01 1.67e+00 1.88e+00 ph/cm2/s
Error 9.54e-02 5.64e-02 5.33e-02 1.06e-01 1.67e-01 1.95e-01 ph/cm2/s
Fluence Cutoff-PL 4.16e-07 6.66e-07 7.74e-07 1.45e-06 2.34e-06 3.30e-06 erg/cm2
Error 4.34e-08 3.93e-08 5.97e-08 6.73e-07 1.62e-07 6.62e-07 erg/cm2
Peak flux Cutoff-PL 5.83e-01 5.76e-01 3.65e-01 2.61e-01 1.66e+00 1.78e+00 ph/cm2/s
Error 1.10e-01 6.98e-02 5.61e-02 1.78e-01 1.71e-01 2.07e-01 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 1.81e+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 1.770 0.101 - - 2.23e-03 1.22e-04 59.050 57
CPL 1.700 0.000 200.6 0.0 2.42e-03 0.00e+00 58.890 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.633 0.182 - - 1.29e-02 1.44e-03 52.710 57
CPL 1.394 0.590 117.5 0.0 1.73e-02 0.00e+00 52.350 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: 18.304000 sec.
T50 in the 50-300 keV band: 9.216000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 115.356 -9.696 105.660
T90 97.884 -6.064 91.820
T50 14.040 0.764 14.804
Peak 1.000 7.600 8.600
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.5754 -35.5898 0.0047 17.1 26.9 2.5826 41.0 TRIG_00421124
------------------------------------------
Foreground time interval of the image:
-9.696 10.021 (delta_t = 19.717 [sec])
Background time interval of the image:
-239.280 -9.696 (delta_t = 229.584 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 -9.696 sec. to 105.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76956 ( -0.100787 0.101994 )
Norm@50keV : 2.22520E-03 ( -0.000122481 0.000121501 )
------------------------------------------------------------
# Chi-Squared = 59.05 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 57 degrees of freedom
# Null hypothesis probability = 4.003982e-01
Photon flux (15-150 keV) in 115.4 sec: 0.303084 ( -0.0157229 0.0157814 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36702e-06 ( -1.34408e-07 1.35669e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.696 sec. to 105.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70001 ( )
Epeak [keV] : 200.610 ( )
Norm@50keV : 2.42361E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.89 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 56 degrees of freedom
# Null hypothesis probability = 3.703015e-01
Photon flux (15-150 keV) in 115.4 sec: 0.300970 ( -0.016091 0.01664 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.33886e-06 ( -1.64803e-07 1.59448e-07 ) ergs/cm2
Band function
Time interval is from -9.696 sec. to 105.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62768 ( 1.38257 1.38257 )
beta : -2.08616 ( 1.88455 11.8837 )
Epeak [keV] : 122.972 ( -122.373 -122.373 )
Norm@50keV : 2.63864E-03 ( -0.00052652 3.58949 )
------------------------------------------------------------
# Chi-Squared = 58.91 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.345879e-01
Photon flux (15-150 keV) in 115.4 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] : 12.4711 ( )
R^2/D10^2 : 5.96664E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 146.39 using 59 PHA bins.
# Reduced chi-squared = 2.5683 for 57 degrees of freedom
# Null hypothesis probability = 8.425923e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.270e-07 2.354e-08
25- 50 7.469e-07 4.466e-08
50-150 7.161e-07 8.793e-08
15-150 1.690e-06 9.751e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 113.589 (-9.63173 47.6683)
Norm : 1.28016 (-0.0909516 0.103953)
------------------------------------------------------------
# Chi-Squared = 61.31 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 57 degrees of freedom
# Null hypothesis probability = 3.241725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.855e-07 3.081e-08
25- 50 6.830e-07 4.252e-08
50-150 1.186e-06 9.209e-08
15-150 2.254e-06 1.217e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.71701 (-1.05594 1.25834)
R1^2/D10^2 : 0.725019 (-0.367606 0.906577)
kT2 [keV] : 21.0453 (-3.25193 5.38118)
R2^2/D10^2 : 7.06916E-03 (-0.00405333 0.0067272)
------------------------------------------------------------
# Chi-Squared = 64.00 using 59 PHA bins.
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.898451e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.061e-07 8.407e-08
25- 50 6.537e-07 1.260e-07
50-150 1.182e-06 2.713e-07
15-150 2.241e-06 4.414e-07
Peak spectrum fit
Power-law model
Time interval is from 7.600 sec. to 8.600 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63310 ( -0.179641 0.184923 )
Norm@50keV : 1.28816E-02 ( -0.00145331 0.0014277 )
------------------------------------------------------------
# Chi-Squared = 52.71 using 59 PHA bins.
# Reduced chi-squared = 0.9247 for 57 degrees of freedom
# Null hypothesis probability = 6.367083e-01
Photon flux (15-150 keV) in 1 sec: 1.67277 ( -0.166655 0.166681 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20015e-07 ( -1.4487e-08 1.47444e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.600 sec. to 8.600 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39397 ( -0.76896 0.410412 )
Epeak [keV] : 117.463 ( )
Norm@50keV : 1.73398E-02 ( )
------------------------------------------------------------
# Chi-Squared = 52.35 using 59 PHA bins.
# Reduced chi-squared = 0.9348 for 56 degrees of freedom
# Null hypothesis probability = 6.139062e-01
Photon flux (15-150 keV) in 1 sec: 1.65744 ( -0.17307 0.16961 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17396e-07 ( -1.6396e-08 1.6055e-08 ) ergs/cm2
Band function
Time interval is from 7.600 sec. to 8.600 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38740 ( 1.28268 1.28268 )
beta : -9.36981 ( 9.99309 19.9931 )
Epeak [keV] : 113.464 ( -50.4679 -113.615 )
Norm@50keV : 1.75556E-02 ( -0.00577705 0.0353737 )
------------------------------------------------------------
# Chi-Squared = 52.35 using 59 PHA bins.
# Reduced chi-squared = 0.9518 for 55 degrees of freedom
# Null hypothesis probability = 5.765196e-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] : 13.1300 (-1.6526 1.89538)
R^2/D10^2 : 0.295012 (-0.112124 0.181448)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 75.92 using 59 PHA bins.
# Reduced chi-squared = 1.332 for 57 degrees of freedom
# Null hypothesis probability = 4.768255e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.079e-08 2.031e-09
25- 50 3.754e-08 4.760e-09
50-150 4.116e-08 9.875e-09
15-150 8.948e-08 1.294e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 152.556 (-6.20268 -101.084)
Norm : 6.91345 (-0.750483 0.886464)
------------------------------------------------------------
# Chi-Squared = 52.46 using 59 PHA bins.
# Reduced chi-squared = 0.9204 for 57 degrees of freedom
# Null hypothesis probability = 6.457024e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.773e-08 2.345e-09
25- 50 3.295e-08 3.365e-09
50-150 6.548e-08 1.147e-08
15-150 1.162e-07 1.461e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.84896 (-1.72706 2.22121)
R1^2/D10^2 : 6.53383 (-4.85061 40.9292)
kT2 [keV] : 19.3215 (-3.88516 7.42928)
R2^2/D10^2 : 6.28355E-02 (-0.0444404 0.0852161)
------------------------------------------------------------
# Chi-Squared = 52.69 using 59 PHA bins.
# Reduced chi-squared = 0.9580 for 55 degrees of freedom
# Null hypothesis probability = 5.633149e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.862e-08 8.935e-09
25- 50 3.079e-08 1.131e-08
50-150 6.167e-08 2.789e-08
15-150 1.111e-07 4.198e-08
Plot creation:
Wed May 5 11:48:22 EDT 2010