//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28814 SUBJECT: GRB 201031A: Swift detection of a burst DATE: 20/10/31 14:33:07 GMT FROM: Kim Page at U.of Leicester 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/) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28818 SUBJECT: Swift Trigger 1003313 (a.k.a. GRB 201031A) is not an astrophysical event DATE: 20/10/31 23:36:27 GMT FROM: Amy Lien at GSFC 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28819 SUBJECT: Swift GRB 201031A: Global MASTER-Net observations report DATE: 20/11/01 00:18:23 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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.