batgrbproduct Analysis for Trigger=299787
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 v2.41
Process Start Time (local time): Fri Dec 28 06:33:28 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger299787/GCN5_download_cron
======================================================================
Trigger: 00299787 Segment: 000
BAT Trigger Time: 220479229.504 [s; MET]
Trigger Stop: 220479230.528 [s; MET]
UTC: 2007-12-27T20:13:47.043260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 58.1198112281124 Dec: -55.9526448765147 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.54
Image Trigger?: NO
Rate S/N Ratio: 37.8549864614954 [ if not an image trigger ]
Image S/N Ratio: 8.54
Flight Position: [ source = BAT ]
RA: 58.1198112281124 Dec: -55.9526448765147 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 58.1152886576899 Dec: -55.9500952258176 [deg; J2000]
{ 03h 52m 27.7s , -55d 57' 00.3" }
+/- 2.68235352933588 [arcmin] (estimated 90% radius based on SNR)
+/- 1.26299161404285 [arcmin] (formal 1-sigma fit error)
SNR: 7.4293811936703
RA = 3h 52m 27.7s (58.115289 deg.)
Dec = -55d 57' 0" (-55.950095 deg.)
Angular difference between Flight and Ground position is 0.215605 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 303.148000001907 +/- 201.589700450749
Measured from: 0.0719999969005585
to: 303.219999998808 [s; relative to TRIGTIME]
T50: 94.2999999821186 +/- 236.806671166005
Measured from: 1.26800000667572
to: 95.5679999887943 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0999999940395355
to: 0.900000005960464 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.143999993801117
to: 380.695999979973 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.487405 0.321316 0.243922 0.169297
0.097032 0.097376 0.086070 0.074818 [error]
Peak 0.048591 0.067791 0.070864 0.030059
0.007832 0.009122 0.008718 0.007806 [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 1.21e-07 1.74e-07 1.86e-07 3.66e-07 5.95e-07 8.50e-07 erg/cm2
Error 4.43e-08 4.52e-08 8.22e-08 3.38e-07 1.90e-07 4.25e-07 erg/cm2
Peak flux Power-law 3.88e-01 4.93e-01 4.58e-01 7.45e-01 1.59e+00 2.08e+00 ph/cm2/s
Error 1.06e-01 7.97e-02 6.94e-02 2.54e-01 2.15e-01 3.02e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-07 1.74e-07 1.86e-07 3.64e-07 5.95e-07 7.83e-07 erg/cm2
Error 4.44e-08 4.53e-08 8.23e-08 3.35e-07 1.91e-07 4.76e-07 erg/cm2
Peak flux Cutoff-PL 3.87e-01 4.93e-01 4.58e-01 7.40e-01 1.59e+00 2.08e+00 ph/cm2/s
Error 1.06e-01 7.98e-02 6.95e-02 2.52e-01 2.15e-01 3.01e-01 ph/cm2/s
Fluence Band 1.24e-07 1.92e-07 1.62e-07 2.33e-07 5.63e-07 7.33e-07 erg/cm2
Error 4.61e-08 5.33e-08 7.85e-08 2.14e-07 1.56e-07 3.40e-07 erg/cm2
Peak flux Band 3.87e-01 4.93e-01 4.58e-01 7.40e-01 1.59e+00 2.08e+00 ph/cm2/s
Error 1.06e-01 7.98e-02 6.95e-02 2.52e-01 2.15e-01 3.01e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.908 0.505 - - 1.70e-04 5.55e-05 59.549 57
CPL 1.646 0.000 57.5 0.0 2.40e-04 1.67e-03 59.686 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.108 0.247 - - 1.37e-02 1.80e-03 59.886 57
CPL 1.103 0.249 9999.3 5000.0 1.38e-02 1.81e-03 59.903 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: 1.600000 sec.
T50 in the 50-300 keV band: 0.768000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 380.840 -0.144 380.696
T90 303.148 0.072 303.220
T50 94.300 1.268 95.568
Peak 1.000 -0.100 0.900
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
58.1153 -55.9501 0.0258 28.5 -84.1 0.3796 7.4 TRIG_00299787
------------------------------------------
Foreground time interval of the image:
-0.144 14.097 (delta_t = 14.241 [sec])
Background time interval of the image:
-239.504 -0.144 (delta_t = 239.360 [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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.144 sec. to 380.696 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90826 ( -0.477723 0.531441 )
Norm@50keV : 1.700001E-04 ( -5.722893E-05 5.381547E-05) )
------------------------------------------------------------
Chi-Squared = 59.54927 using 59 PHA bins.
Reduced chi-squared = 1.044724 for 57 degrees of freedom
Null hypothesis probability = 0.383
Photon flux (15-150 keV) in 380.8 sec: 2.448268E-02 ( -0.00630812 0.00630864 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.95088e-07 ( -1.85183e-07 1.95754e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.144 sec. to 380.696 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64645 ( )
Epeak [keV] : 57.4723 ( )
Norm@50keV : 2.403594E-04 ( -7.036784E-05 3.261393E-03) )
------------------------------------------------------------
Chi-Squared = 59.68576 using 59 PHA bins.
Reduced chi-squared = 1.065817 for 56 degrees of freedom
Null hypothesis probability = 0.343
Photon flux (15-150 keV) in 380.8 sec: 2.447549E-02 ( -0.00630633 0.00630683 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.95221e-07 ( -1.85392e-07 1.95613e-07 ) ergs/cm2
Band function
Time interval is from -0.144 sec. to 380.696 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63776 ( -12.1921 2.80788 )
beta : -9.08112 ( -1.21010 0.628194 )
Epeak [keV] : 56.4730 ( -27.8806 610.081 )
Norm@50keV : 2.434584E-04 ( -0.143945 33.1224 )
------------------------------------------------------------
Chi-Squared = 59.69345 using 59 PHA bins.
Reduced chi-squared = 1.085335 for 55 degrees of freedom
Null hypothesis probability = 0.309
Photon flux (15-150 keV) in 380.8 sec: 2.475353E-02 ( -0.00627423 0.00624369 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63356e-07 ( -1.69506e-07 1.42427e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10820 ( -0.250783 0.242931 )
Norm@50keV : 1.370471E-02 ( -1.804585E-03 1.800937E-03) )
------------------------------------------------------------
Chi-Squared = 59.88584 using 59 PHA bins.
Reduced chi-squared = 1.050629 for 57 degrees of freedom
Null hypothesis probability = 0.371
Photon flux (15-150 keV) in 1.000 sec: 1.59093 ( -0.21477 0.21528 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42938e-07 ( -2.1135e-08 2.1279e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10341 ( -0.252744 0.244611 )
Epeak [keV] : 9999.33 ( -9999.33 0.665039 )
Norm@50keV : 1.377859E-02 ( -1.812264E-03 1.809778E-03) )
------------------------------------------------------------
Chi-Squared = 59.90344 using 59 PHA bins.
Reduced chi-squared = 1.069704 for 56 degrees of freedom
Null hypothesis probability = 0.336
Photon flux (15-150 keV) in 1.000 sec: 1.59047 ( -0.21471 0.21522 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42934e-07 ( -2.1108e-08 2.1309e-08 ) ergs/cm2
Band function
Time interval is from -0.100 sec. to 0.900 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.774531 ( -9.22547 5.72777 )
beta : -1.12009 ( -8.87991 0.259078 )
Epeak [keV] : 98.3028 ( -98.2028 9899.87 )
Norm@50keV : 2.383466E-02 ( -1.70818 591.225 )
------------------------------------------------------------
Chi-Squared = 59.80341 using 59 PHA bins.
Reduced chi-squared = 1.087335 for 55 degrees of freedom
Null hypothesis probability = 0.306
Photon flux (15-150 keV) in 1.000 sec: 1.59047 ( -0.21471 0.21522 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42873e-07 ( -2.1138e-08 2.1257e-08 ) ergs/cm2
Plot creation:
Fri Dec 28 07:03:43 EST 2007