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GRB 101020A

GCN Circular 11357

Subject

GRB 101020A: Swift detection of a burst

Date

2010-10-20T23:54:11Z (15 years ago)

From

David Palmer at LANL <palmer@lanl.gov>

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

Subject

GRB 101020A, Swift-BAT refined analysis

Date

2010-10-21T13:36:55Z (15 years ago)

From

Hans Krimm at NASA-GSFC <hans.krimm@nasa.gov>

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. 11357Loading...
 
 ).  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

Subject

GRB 101020A: MASTER polarization optical observations

Date

2010-10-21T14:16:08Z (15 years ago)

From

Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>

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#11357Loading...
 
 ) 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

Subject

GRB 101020A: BOOTES2 follow-up and limit

Date

2010-10-21T14:23:38Z (15 years ago)

From

Martin Jelinek at Inst.Astrophys.Andalucia,Granada <mates@iaa.es>

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

Subject

GRB 101020A: MASTER prompt and afterglow limit

Date

2010-10-22T15:41:40Z (15 years ago)

From

Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>

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#11357Loading...
 
 ) 22 s after Notice Time and 106 s after trigger time 
at large zenit distance (80 degrees) (Krushinski et al., GCN Circ 11359Loading...
 
 ).


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