Gamma-ray Burst 101020A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Oct 10 23:42:05 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     436737,   Seg_Num: 0
GRB_RA:          189.566d {+12h 38m 16s} (J2000),
                 189.701d {+12h 38m 48s} (current),
                 188.945d {+12h 35m 47s} (1950)
GRB_DEC:         +23.161d {+23d 09' 39"} (J2000),
                 +23.102d {+23d 06' 06"} (current),
                 +23.436d {+23d 26' 08"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=2294 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        15489 TJD;   293 DOY;   10/10/20
GRB_TIME:        85241.70 SOD {23:40:41.70} UT
GRB_PHI:         -41.94 [deg]
GRB_THETA:        39.21 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    13.24 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +2 -100  +0 -79  +0 
SUN_POSTN:       205.50d {+13h 42m 00s}  -10.57d {-10d 34' 19"}
SUN_DIST:         37.06 [deg]   Sun_angle= 1.1 [hr] (West of Sun)
MOON_POSTN:        1.90d {+00h 07m 35s}   +6.29d {+06d 17' 06"}
MOON_DIST:       149.64 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      265.30, 85.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      178.97, 24.94 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 254.64,-11.00 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Oct 10 23:44:37 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     436737,   Seg_Num: 0
GRB_RA:          189.566d {+12h 38m 16s} (J2000),
                 189.701d {+12h 38m 48s} (current),
                 188.945d {+12h 35m 47s} (1950)
GRB_DEC:         +23.161d {+23d 09' 39"} (J2000),
                 +23.102d {+23d 06' 06"} (current),
                 +23.436d {+23d 26' 08"} (1950)
GRB_DATE:        15489 TJD;   293 DOY;   10/10/20
GRB_TIME:        85241.70 SOD {23:40:41.70} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -41.94 [deg]
GRB_THETA:        39.21 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    13.24 [sigma]
LC_URL:          sw00436737000msb.lc
SUN_POSTN:       205.50d {+13h 42m 01s}  -10.57d {-10d 34' 21"}
SUN_DIST:         37.06 [deg]   Sun_angle= 1.1 [hr] (West of Sun)
MOON_POSTN:        1.91d {+00h 07m 40s}   +6.29d {+06d 17' 37"}
MOON_DIST:       149.64 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      265.30, 85.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      178.97, 24.94 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 254.64,-11.00 [deg].

GCN Circular #11357
C. J. Saxton (UCL-MSSL), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (NASA/UMBC), M. De Pasquale (UCL-MSSL), N. Gehrels (NASA/GSFC), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), O. M. Littlejohns (U Leicester), C. B. Markwardt (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift Team:
At 23:40:41 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 101020A (trigger=436737). Due to a Sun constraint, Swift was unable to slew to the burst. The BAT on-board calculated location is RA, Dec 189.566, +23.161 which is
```
   RA(J2000) = 12h 38m 16s
   Dec(J2000) = +23d 09' 39"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with image triggers, the BAT light curve does not show any clear structure. Ground processing of the flight scaled map shows a strong 14 sigma source. The peak count rate was ~200 counts/sec (15-350 keV), at ~0 sec after the trigger. There are no known X-ray transient sources near this position.
Due to an Sun observing constraint, Swift cannot slew to the BAT position until 17:41 UT on 2010 November 02. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is C. J. Saxton (cjs2 AT mssl.ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #11358
T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), C. J. Saxton (UCL-MSSL), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of Swift/BAT GRB 101020A (trigger #436737) (Saxton, et al., GCN Circ. 11357). The BAT ground-calculated position is RA, Dec = 189.607, 23.129 deg which is
```
    RA(J2000)  =  12h 38m 25.8s
    Dec(J2000) = +23d 07' 44.1"
```
with an uncertainty of 3.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 42%.
The mask-weighted light curve shows a very broad peak with no obvious features, extending roughly from T-50 sec to T+150 sec. Most of the emission is below 50 keV. A pre-planned slew took the burst out of the field of view at about T+230 sec. T90 (15-350 keV) is 175.0 +- 28. sec (estimated error including systematics).
The time-averaged spectrum from T-50.0 to T+159.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.04 +- 0.17. The fluence in the 15-150 keV band is 2.6 +- 0.3 x 10^-06 erg/cm^2. The 1-sec peak photon flux measured from T+19.00 sec in the 15-150 keV band is 0.5 +- 0.2 ph/cm^2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/436737/BA/
GCN Circular #11359
V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
MASTER-Net robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Ekaterinburg (Kourovka) was pointed to the Swift GRB 101008A (Saxton et al., GCN#11357) 22 s after Notice Time and 106 s after trigger time at large zenit distance (80 degrees).
We have number images in two perpendicular polarizations (along apha & dec) in V-band.
We have no found any OT.
```
t_start-t_trig(s)   mean time     exp_time(s)   m_lim     Coadd?   Filter
--------------------------------------------------------------------------
      106            116              20          14.0      N      V+P1
      106            116              20          14.0      N      V+P2
      106            116             20+20        14.5      Y     V+P1+P2
--------------------------------------------------------------------------
```
MASTER II have 2 images per exposition time. The message may be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #11360
Martin Jelinek (IAA-CSIC) and Antonio de Ugarte Postigo (DARK/NBI) on behalf of a larger collaboration report:
"The 0.6m Telma telescope at BOOTES-2 (Malaga, Spain) observed the errorbox of GRB101020a (Saxton et al., GCNC11357) in the early morning of 21. October 2010, starting 04:48 UT. 40x 60s r' band images were taken. The combined exposure has a 3-sigma magnitude limit r'>18.0 calibrated against USNO-A2.0. The effective exposure time is 05:08:14UT, i.e. 5.46h after the GRB trigger."
GCN Circular #11361
V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka
K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk
MASTER-Net robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Ekaterinburg (Kourovka) was pointed to the Swift GRB 101008A (Saxton et al., GCN#11357) 22 s after Notice Time and 106 s after trigger time at large zenit distance (80 degrees) (Krushinski et al., GCN Circ 11359).
We have no found any OT.
```
t_start-t_trig(s)   mean time     exp_time(s)   m_lim     Coadd?   Filter
--------------------------------------------------------------------------
      106            116             20+20        14.9       Y        V
      472           2836             4300         18.5       Y        V
--------------------------------------------------------------------------
```
MASTER II have 2 images per exposition time. The message may be cited.
mailto: lipunov@sai.msu.ru

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Jochen Greiner, last update: 21-Oct-2010 [Disclaimer]