batgrbproduct Analysis for Trigger=281993
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 Nov 25 14:32:00 EST 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/281993
======================================================================
Trigger: 00281993 Segment: 000
BAT Trigger Time: 203201548.16 [s; MET]
Trigger Stop: 203201550.208 [s; MET]
UTC: 2007-06-10T20:52:26.146640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 298.795395293668 Dec: 26.2137864105949 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.16
Image Trigger?: NO
Rate S/N Ratio: 10.770329614269 [ if not an image trigger ]
Image S/N Ratio: 7.16
Flight Position: [ source = BAT ]
RA: 298.795395293668 Dec: 26.2137864105949 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 298.799324957682 Dec: 26.2552920506668 [deg; J2000]
{ 19h 55m 11.8s , +26d 15' 19.1" }
+/- 1.82478749405193 [arcmin] (estimated 90% radius based on SNR)
+/- 0.843690643455537 [arcmin] (formal 1-sigma fit error)
SNR: 12.8812484622192
Angular difference between Flight and Ground position is 2.499303 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 5.64799997210503 +/- 0.988380494889452
Measured from: -0.535999983549118
to: 5.11199998855591 [s; relative to TRIGTIME]
T50: 2.65599995851517 +/- 0.785468034648703
Measured from: 0.696000009775162
to: 3.35199996829033 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.75600001215935
to: 2.75600001215935 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.840000003576279
to: 5.608000010252 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.171668 0.132179 0.127512 0.032508
0.018568 0.019189 0.017106 0.015490 [error]
Peak 0.044275 0.035771 0.021235 0.014340
0.007450 0.007789 0.006782 0.006162 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary (tot_pha/preslew_drm) ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 4.45e-08 7.08e-08 8.52e-08 2.00e-07 2.58e-07 4.02e-07 erg/cm2
Error 8.97e-09 8.79e-09 1.76e-08 8.77e-08 3.98e-08 1.03e-07 erg/cm2
Peak flux Power-law 4.14e-01 3.04e-01 1.48e-01 1.03e-01 9.14e-01 9.69e-01 ph/cm2/s
Error 1.20e-01 6.22e-02 5.81e-02 7.90e-02 1.83e-01 2.00e-01 ph/cm2/s
Fluence Cutoff-PL 4.43e-08 7.09e-08 8.53e-08 1.99e-07 2.58e-07 4.01e-07 erg/cm2
Error 8.97e-09 8.80e-09 1.76e-08 8.71e-08 3.98e-08 1.03e-07 erg/cm2
Peak flux Cutoff-PL 4.14e-01 3.04e-01 1.48e-01 1.02e-01 9.14e-01 9.68e-01 ph/cm2/s
Error 1.20e-01 6.22e-02 5.81e-02 7.84e-02 1.83e-01 2.00e-01 ph/cm2/s
Fluence Band 4.26e-08 7.04e-08 8.79e-08 2.18e-07 2.62e-07 4.19e-07 erg/cm2
Error 6.09e-09 8.72e-09 1.14e-08 6.15e-08 3.44e-08 5.19e-08 erg/cm2
Peak flux Band 4.02e-01 3.05e-01 1.53e-01 1.10e-01 9.15e-01 9.93e-01 ph/cm2/s
Error 9.00e-02 6.09e-02 3.65e-02 4.41e-02 1.83e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.734 0.253 - - 4.33e-03 6.32e-04 51.335 57
CPL 1.733 0.254 9999.2 5000.0 4.34e-03 6.37e-04 51.342 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.035 0.445 - - 6.00e-03 1.74e-03 62.836 57
CPL 2.065 0.000 30.3 5000.0 5.30e-03 0.00e+00 62.593 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: 6.464000 sec.
T50 in the 50-300 keV band: 2.688000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.448 -0.840 5.608
T90 5.648 -0.536 5.112
T50 2.656 0.696 3.352
Peak 1.000 1.756 2.756
Image
Pre-slew 15-350 keV image (Event data; bgd subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
298.7993 +26.2553 0.0149 26.0 110.4 0.4501 12.9 TRIG_00281993
------------------------------------------
Foreground time interval of the image:
203201547.320000 203201553.768000
Background time interval of the image:
203201309.000000 203201547.320000
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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 2.048000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Flight mask-tagged light curves
Quad-rate summed light curves (from T0-300 to T0+1000)
Spectral Evolution
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 -0.840 sec. to 5.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73351 ( -0.247407 0.258564 )
Norm@50keV : 4.333619E-03 ( -6.442703E-04 6.200969E-04) )
------------------------------------------------------------
Chi-Squared = 51.33490 using 59 PHA bins.
Reduced chi-squared = 0.9006124 for 57 degrees of freedom
Null hypothesis probability = 0.687
Photon flux (15-150 keV) in 6.448 sec: 0.582461 ( -0.072562 0.072609 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58061e-07 ( -3.93592e-08 4.03013e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.840 sec. to 5.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73267 ( -0.248344 0.259685 )
Epeak [keV] : 9999.22 ( -9999.21 0.783203 )
Norm@50keV : 4.339692E-03 ( -6.484787E-04 6.246679E-04) )
------------------------------------------------------------
Chi-Squared = 51.34221 using 59 PHA bins.
Reduced chi-squared = 0.9168251 for 56 degrees of freedom
Null hypothesis probability = 0.652
Photon flux (15-150 keV) in 6.448 sec: 0.582214 ( -0.072538 0.072584 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58088e-07 ( -3.94037e-08 4.02645e-08 ) ergs/cm2
Band function
Time interval is from -0.840 sec. to 5.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73264 ( -8.26736 0.248316 )
beta : -7.38207 ( -2.61793 5.66473 )
Epeak [keV] : 9999.16 ( -9999.07 0.834961 )
Norm@50keV : 4.339094E-03 ( -6.488701E-04 6.240732E-04) )
------------------------------------------------------------
Chi-Squared = 51.34223 using 59 PHA bins.
Reduced chi-squared = 0.9334951 for 55 degrees of freedom
Null hypothesis probability = 0.615
Photon flux (15-150 keV) in 6.448 sec: 0.582214 ( -0.072538 0.072583 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61731e-07 ( -3.63171e-08 3.24115e-08 ) ergs/cm2
Peak spectrum fit
Power-law model
Time interval is from 1.752 sec. to 2.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03540 ( -0.416435 0.474525 )
Norm@50keV : 5.996600E-03 ( -1.802810E-03 1.677157E-03) )
------------------------------------------------------------
Chi-Squared = 62.83575 using 59 PHA bins.
Reduced chi-squared = 1.102381 for 57 degrees of freedom
Null hypothesis probability = 0.277
Photon flux (15-150 keV) in 1.008 sec: 0.914453 ( -0.182592 0.182597 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.58312e-08 ( -1.45093e-08 1.54223e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.752 sec. to 2.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06524 ( )
Epeak [keV] : 30.2809 ( -44.7303 9955.26 )
Norm@50keV : 5.297586E-03 ( )
------------------------------------------------------------
Chi-Squared = 62.59330 using 59 PHA bins.
Reduced chi-squared = 1.117737 for 56 degrees of freedom
Null hypothesis probability = 0.254
Photon flux (15-150 keV) in 1.008 sec: 0.914071 ( -0.182534 0.182539 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.58516e-08 ( -1.45631e-08 1.53831e-08 ) ergs/cm2
Band function
Time interval is from 1.752 sec. to 2.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52162 ( -3.433228E-04 14.9997 )
beta : -1.98193 ( -0.474753 0.415688 )
Epeak [keV] : 10.3983 ( -10.2983 9989.60 )
Norm@50keV : 2.046524E-02 ( -0.245090 0.227902 )
------------------------------------------------------------
Chi-Squared = 62.87780 using 59 PHA bins.
Reduced chi-squared = 1.143233 for 55 degrees of freedom
Null hypothesis probability = 0.217
Photon flux (15-150 keV) in 1.008 sec: 0.914670 ( -0.182649 0.18259 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.63051e-08 ( -1.12399e-08 2.16859e-08 ) ergs/cm2
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73351 ( -0.247407 0.258564 )
Norm@50keV : 4.333619E-03 ( -6.442703E-04 6.200969E-04) )
------------------------------------------------------------
Chi-Squared = 51.33490 using 59 PHA bins.
Reduced chi-squared = 0.9006124 for 57 degrees of freedom
Null hypothesis probability = 0.687
Photon flux (15-150 keV) in 6.448 sec: 0.582461 ( -0.072562 0.072609 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58061e-07 ( -3.93592e-08 4.03013e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73267 ( -0.248344 0.259685 )
Epeak [keV] : 9999.22 ( -9999.21 0.783203 )
Norm@50keV : 4.339692E-03 ( -6.484787E-04 6.246679E-04) )
------------------------------------------------------------
Chi-Squared = 51.34221 using 59 PHA bins.
Reduced chi-squared = 0.9168251 for 56 degrees of freedom
Null hypothesis probability = 0.652
Photon flux (15-150 keV) in 6.448 sec: 0.582214 ( -0.072538 0.072584 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58088e-07 ( -3.94037e-08 4.02645e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.73264 ( -8.26736 0.248316 )
beta : -7.38207 ( -2.61793 5.66473 )
Epeak [keV] : 9999.16 ( -9999.07 0.834961 )
Norm@50keV : 4.339094E-03 ( -6.488701E-04 6.240732E-04) )
------------------------------------------------------------
Chi-Squared = 51.34223 using 59 PHA bins.
Reduced chi-squared = 0.9334951 for 55 degrees of freedom
Null hypothesis probability = 0.615
Photon flux (15-150 keV) in 6.448 sec: 0.582214 ( -0.072538 0.072583 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.61731e-07 ( -3.63171e-08 3.24115e-08 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 7.083e-08
S(50-100 keV) = 8.51736e-08
T90 vs. Hardness ratio plot
T90 = 5.64799997210503 sec.
Hardness ratio = 1.20251
Color vs. Color plot
Count ratio (25-50 keV) / (15-25 keV) = 0.769969
Count ratio (100-50 keV) / (15-25 keV) = 0.742783
DPI of the refined source position
IMX = -1.701727718788256E-01, IMY = -4.576253514904684E-01
TIME vs. PHA plot around the trigger time
TIME vs. DetID plot around the trigger time
100 us light curve (15-350 keV)
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image is from -239.160 sec. to -0.840 sec.
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.5903 +35.2016 0.0000 21.5 129.8 5.0326 24.7 Cyg X-1
308.1103 +40.9526 0.0000 14.2 146.3 1.8059 10.2 Cyg X-3
326.1717 +38.3217 0.0000 0.1 113.7 0.3864 2.3 Cyg X-2
21.2420 +26.9648 0.0750 47.0 -53.1 2.2835 2.6 UNKNOWN
317.4883 +19.0521 0.0441 20.7 63.9 0.8628 4.3 UNKNOWN
344.3851 -1.2874 0.0482 43.0 12.8 1.1892 3.9 UNKNOWN
350.9599 +9.4803 0.0473 36.4 -4.1 0.9551 4.1 UNKNOWN
------------------------------------------
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image is from -0.840 sec. to 5.608 sec.
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.5903 +35.2016 0.0000 21.5 129.8 0.0433 1.4 Cyg X-1
308.1103 +40.9526 0.0000 14.2 146.3 -0.0211 -0.9 Cyg X-3
326.1717 +38.3217 0.0000 0.1 113.7 -0.0022 -0.1 Cyg X-2
23.2640 +58.2036 0.0403 41.2 -97.9 0.4986 4.8 UNKNOWN
283.4755 +61.2741 0.0420 34.8 -174.9 0.1420 4.6 UNKNOWN
298.7989 +26.2542 0.0147 26.0 110.4 0.4555 13.0 UNKNOWN
------------------------------------------
Post-slew image of 15-350 keV band
Time interval of the image is from 198.141 sec. to 962.903 sec.
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.3158 -60.6230 0.0000 46.1 13.5 0.1143 0.2 Cen X-3
186.6567 -62.7703 0.0000 45.0 24.7 1.8537 2.2 GX 301-2
55.4385 -36.2228 0.0992 41.1 -98.0 5.0245 2.0 UNKNOWN
103.0182 -76.7019 0.0528 21.6 -7.9 1.2205 3.7 UNKNOWN
124.3059 -41.2946 0.0502 56.3 -28.4 9.1314 3.8 UNKNOWN
256.6986 -61.5628 0.0660 40.1 70.8 3.9349 2.9 UNKNOWN
------------------------------------------