Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.47
Process Start Time: Mon May 18 14:36:34 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger958733
======================================================================
Trigger: 00958733 Segment: 000
BAT Trigger Time: 604581305.664 [s; MET]
Trigger Stop: 604581313.856 [s; MET]
UTC: 2020-02-28T11:14:41.151740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.025900508948 Dec: 16.9602927726214 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: NO
Rate S/N Ratio: 9.74679434480896 [ if not an image trigger ]
Image S/N Ratio: 7.13
Analysis Position: [ source = BAT ]
RA: 252.025900508948 Dec: 16.9602927726214 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 252.00738688842 Dec: 16.9637778448686 [deg; J2000]
{ 16h 48m 01.8s , +16d 57' 49.6" }
+/- 2.46818898680289 [arcmin] (estimated 90% radius based on SNR)
+/- 0.969458862098571 [arcmin] (formal 1-sigma fit error)
SNR: 8.36715461069679
Angular difference between the analysis and refined position is 1.082876 arcmin
Partial Coding Fraction: 0.3125 [ including projection effects ]
Duration
T90: 7.36799991130829 +/- 1.57555826006172
Measured from: -0.580000042915344
to: 6.78799986839294 [s; relative to TRIGTIME]
T50: 3.76800000667572 +/- 1.59487299974957
Measured from: 1.39599990844727
to: 5.16399991512299 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.31599998474121
to: 2.31599998474121 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.843999981880188
to: 6.96799993515015 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.213784 0.241939 0.087826 0.029460
0.038513 0.035698 0.029308 0.025365 [error]
Peak 0.067294 0.013172 0.018266 0.000895
0.014146 0.012987 0.010706 0.009343 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 7.812 -0.844 6.968
T90 7.368 -0.580 6.788
T50 3.768 1.396 5.164
Peak 1.000 1.316 2.316
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -2.271 -0.387 0.342 - - - 4.05e-03 -1.05e-03 1.01e-03 57.350 57
CPL -1.437 -0.628 2.474 26.359 N/A N/A 1.28e-02 N/A N/A 56.620 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -4.473 -2.677 1.614 - - - 1.01e-03 -1.01e-03 3.17e-03 42.680 57
CPL -1.986 1.986 1.986 0.508 -0.462 17.039 1.48e-02 5.97e-02 1.40e-01 46.690 56
=== 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 PL 8.37e-08 9.65e-08 8.00e-08 1.11e-07 3.00e-07 3.72e-07 erg/cm2
90%_error_low -2.00e-08 -1.83e-08 -2.69e-08 -5.89e-08 -6.34e-08 -9.88e-08 erg/cm2
90%_error_hi 2.07e-08 1.80e-08 2.85e-08 9.12e-08 6.56e-08 1.21e-07 erg/cm2
Peak flux PL 7.93e-01 1.47e-01 1.32e-02 1.29e-03 9.54e-01 9.54e-01 ph/cm2/s
90%_error_low -2.83e-01 -1.19e-01 -1.32e-02 -1.29e-03 -3.65e-01 -3.65e-01 ph/cm2/s
90%_error_hi 2.77e-01 1.68e-01 6.69e-02 2.57e-02 3.62e-01 3.63e-01 ph/cm2/s
Fluence CPL N/A N/A N/A N/A N/A N/A erg/cm2
90%_error_low -2.00e-08 -1.83e-08 -2.69e-08 -5.89e-08 -6.34e-08 -9.88e-08 erg/cm2
90%_error_hi 2.07e-08 1.80e-08 2.85e-08 9.12e-08 6.56e-08 1.21e-07 erg/cm2
Peak flux CPL 7.22e-01 8.58e-02 4.70e-03 3.29e-04 8.12e-01 8.13e-01 ph/cm2/s
90%_error_low -3.03e-01 -8.58e-02 -4.70e-03 -3.29e-04 -3.80e-01 -3.80e-01 ph/cm2/s
90%_error_hi 2.91e-01 1.71e-01 4.65e-02 1.44e-02 3.96e-01 3.97e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 252.0074 16.9638 0.0230 39.3231 145.6634 0.5785641 8.367 TRIG_00958733 Foreground time interval of the image: -0.844 6.968 (delta_t = 7.812 [sec]) Background time interval of the image: -239.664 -0.844 (delta_t = 238.820 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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 average DRM
Power-law model
Time interval is from -0.844 sec. to 6.968 sec. XSPEC12>exit XSPEC: quit Photon index: -2.27094 ( -0.387325 0.341722 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 2.27094 ( -0.341722 0.387325 ) Norm@50keV : 4.04532E-03 ( -0.00104604 0.00100617 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 7.812 sec: 0.695782 ( -0.126362 0.126437 ) ph/cm2/s Energy fluence (15-150 keV) : 3.00499e-07 ( -6.3442e-08 6.55528e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.844 sec. to 6.968 sec. XSPEC: quit Photon index: -1.43687 ( -0.627889 2.47376 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.43687 ( -2.47376 0.627889 ) Epeak [keV] : 26.3590 ( ) Norm@50keV : 1.28340E-02 ( ) ------------------------------------------------------------ Photon flux (15-150 keV) in 7.812 sec: 0.677166 ( ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.316 sec. to 2.316 sec. XSPEC12>exit XSPEC: quit Photon index: -4.47324 ( -2.67572 1.61495 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 4.47324 ( -1.61495 2.67572 ) Norm@50keV : 1.01188E-03 ( -0.00101022 0.00317389 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.953921 ( -0.364586 0.362069 ) ph/cm2/s Energy fluence (15-150 keV) : 3.20908e-08 ( -1.46036e-08 1.89679e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.316 sec. to 2.316 sec. XSPEC: quit Photon index: -1.98588 ( 1.98588 1.98588 ) ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 1.98588 ( -1.98588 -1.98588 ) Epeak [keV] : 0.118025 ( -0.0718928 17.4294 ) Norm@50keV : 0.114801 ( -0.0403748 0.0403748 ) ------------------------------------------------------------ Photon flux (15-150 keV) in 1 sec: 0.812489 ( -0.379656 0.395621 ) ph/cm2/s Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 7.368 sec. Hardness ratio (energy fluence ratio) = 0.828819451459
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.8021307e-07 S(50-150 keV) = 1.2028718e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -6.764138944444137E-01, IMY = -4.620524165263773E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.664000 -0.844000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9800 -15.6516 0.7 28.3 86.6 7.9390 17.3 0.7 Sco X-1 254.3343 35.3143 36.4 54.3 160.6 0.4760 0.3 6.3 Her X-1 255.9390 -37.8087 3.0 27.6 33.5 1.3844 3.9 3.1 4U 1700-377 256.4056 -36.5662 6.7 26.4 34.7 0.6300 1.7 8.7 GX 349+2 262.9716 -24.7591 2.9 14.1 48.3 1.1702 4.0 2.2 GX 1+4 264.5660 -44.3178 6.4 29.9 14.9 0.6319 1.8 11.0 4U 1735-44 268.2811 -1.6027 3.6 15.2 156.9 0.9152 3.2 10.4 SW J1753.5-0127 270.1221 -24.9268 0.0 10.2 23.2 0.0474 0.2 12.7 GX 5-1 270.3580 -25.7154 5.5 10.8 20.5 0.6155 2.1 3.4 GRS 1758-258 274.0606 -13.8858 4.3 1.7 170.2 0.7591 2.7 9.6 GX 17+2 275.9156 -30.4078 4.4 14.9 -4.4 0.8176 2.6 2.5 H1820-303 284.8838 -25.0817 0.0 13.7 -43.6 -0.4665 -1.7 12.7 HT1900.1-2455 288.7527 10.8099 137.1 30.0 -150.1 -0.0316 -0.1 8.6 GRS 1915+105 299.4572 35.2404 3.7 56.1 -154.6 4.8470 3.1 6.9 Cyg X-1 262.8261 -33.6726 0.0 20.9 28.6 0.4320 1.3 12.7 GX 354-0 243.5292 -61.3943 2.7 50.8 19.2 3.4637 4.3 ------ UNKNOWN 322.0618 -47.7188 2.8 50.6 -39.3 5.2841 4.1 ------ UNKNOWN 312.8262 6.1640 2.9 43.8 -116.1 5.7975 4.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.844000 6.968000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 245.0605 -15.5175 9.6 28.2 86.9 0.0655 1.2 8.7 Sco X-1 254.5589 35.2279 10.4 54.2 160.8 -0.2188 -1.1 8.5 Her X-1 256.0084 -37.9951 6.1 27.7 33.1 -0.0830 -1.9 9.1 4U 1700-377 256.5200 -36.2878 5.8 26.1 34.9 0.0837 2.0 9.1 GX 349+2 263.1687 -24.6577 80.6 13.9 48.2 0.0048 0.1 10.2 GX 1+4 264.5677 -44.2868 0.0 29.9 14.9 0.0908 2.3 12.3 4U 1735-44 268.5135 -1.4575 3.1 15.3 157.9 0.1292 3.7 8.7 SW J1753.5-0127 270.1202 -25.1572 25.4 10.4 22.7 0.0151 0.5 10.1 GX 5-1 270.4673 -25.5960 0.0 10.7 20.2 -0.0562 -1.7 12.5 GRS 1758-258 274.1599 -13.9930 11.4 1.6 172.9 0.0333 1.0 9.3 GX 17+2 275.8193 -30.2250 4.7 14.7 -4.1 -0.0859 -2.5 10.1 H1820-303 285.1987 -24.9108 8.6 13.8 -44.9 0.0424 1.3 8.9 HT1900.1-2455 288.9501 10.7947 0.0 30.1 -149.7 0.0566 1.4 12.7 GRS 1915+105 299.6320 35.0553 7.0 56.0 -154.4 -0.2695 -1.7 9.0 Cyg X-1 263.1534 -33.9769 4.1 21.0 27.5 -0.0989 -2.8 11.8 GX 354-0 244.1591 -44.9782 2.4 38.9 35.3 0.3149 4.8 ------ UNKNOWN 252.0074 16.9638 1.4 39.3 145.7 0.5786 8.4 ------ UNKNOWN 297.4242 -66.0365 2.3 52.7 -10.8 0.4561 5.0 ------ UNKNOWN 305.0412 -59.1260 2.1 49.0 -19.5 0.3779 5.4 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 119.436600 302.526000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9794 -15.6404 601.3 33.3 4.6 -0.0547 -0.0 0.0 Sco X-1 254.5020 35.3455 23.8 18.5 178.5 1.1316 0.5 2.2 Her X-1 255.9090 -37.9535 43.6 55.0 -11.6 1.8644 0.3 7.5 4U 1700-377 256.4258 -36.3852 13.3 53.5 -12.2 -6.1865 -0.9 2.3 GX 349+2 262.9384 -24.7375 8.5 43.0 -22.4 4.8200 1.4 3.9 GX 1+4 268.4049 -1.3141 4.7 24.4 -50.9 -6.9196 -2.5 8.6 SW J1753.5-0127 270.3655 -25.0914 4.3 45.7 -31.3 -11.8374 -2.7 4.5 GX 5-1 270.3495 -25.7631 8.7 46.3 -30.9 6.1554 1.3 2.8 GRS 1758-258 273.9007 -13.8974 0.0 37.7 -44.1 2.3977 0.6 10.3 GX 17+2 276.0057 -30.2232 6.2 52.5 -34.1 17.1092 1.9 9.6 H1820-303 288.6432 10.9113 6.9 36.0 -93.1 -9.6400 -1.7 9.4 GRS 1915+105 299.6566 35.2598 7.1 46.0 -130.8 11.8834 1.6 4.8 Cyg X-1 262.8399 -33.8997 5.5 51.9 -19.3 -12.2072 -2.1 8.4 GX 354-0 239.4945 -8.2255 2.9 28.1 19.3 11.6988 4.0 ------ UNKNOWN 246.9439 16.6454 2.7 4.9 79.3 10.2413 4.3 ------ UNKNOWN 300.5167 40.2234 3.3 47.7 -137.3 23.3911 3.5 ------ UNKNOWN 302.3587 34.2807 2.7 48.0 -129.0 42.5518 4.4 ------ UNKNOWN