GRB 201031A
GCN Circular 28814
Subject
GRB 201031A: Swift detection of a burst
Date
2020-10-31T14:33:07Z (5 years ago)
From
Kim Page at U.of Leicester <klp5@leicester.ac.uk>
S. Laha (GSFC/UMBC/CRESST), N. P. M. Kuin (UCL-MSSL),
K. L. Page (U Leicester) and B. Sbarufatti (PSU) report on behalf of
the Neil Gehrels Swift Observatory Team:
At 14:19:55 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 201031A (trigger=1003313). Swift did not slew immediately
to the burst due to an observing constraint.
The BAT on-board calculated location is
RA, Dec 254.277, -9.140 which is
RA(J2000) = 16h 57m 06s
Dec(J2000) = -09d 08' 23"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a complex
structure with a duration of about 80 sec. The peak count rate
was ~1300 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 09:11 UT on 2021 January 19. There will thus be no XRT
or UVOT data for this trigger before this time.
Burst Advocate for this burst is S. Laha (sib.laha AT gmail.com).
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/)
GCN Circular 28818
Subject
Swift Trigger 1003313 (a.k.a. GRB 201031A) is not an astrophysical event
Date
2020-10-31T23:36:27Z (5 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),
S. Laha (GSFC/UMBC/CRESST), A. Tohuvavohu (U Toronto)
report on behalf of the Neil Gehrels Swift Observatory Team:
Further analysis of Swift trigger 1003313 (previously reported
as GRB 201031A; Laha et al., CGN Circ. 28814) using
the data set from T-60 to T+243 sec shows that
the BAT image significance has now decreased to 2.6 sigma
(15-350 keV). Also, the mask-weighted light curve does not
show anything significant.
We thus conclude that this event is due to noise,
and is not an astrophysical event.
GCN Circular 28819
Subject
Swift GRB 201031A: Global MASTER-Net observations report
Date
2020-11-01T00:18:23Z (5 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko
(Blagoveschensk Educational State University)
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB 201031A ( S. Laha et al., GCN 28814) errorbox 34924 sec after notice time and 35035 sec after trigger time at 2020-11-01 00:03:50 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 76 deg. The sun altitude is -13.9 deg.
The galactic latitude b = 20 deg., longitude l = 11 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1472957
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
35125 | MASTER-OAFA | C | 180 | 16.6 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.