//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28454 SUBJECT: GRB 200919A: Swift detection of a burst DATE: 20/09/19 02:00:19 GMT FROM: David Palmer at LANL T. N. Ukwatta (LANL), D. N. Burrows (PSU), V. D'Elia (SSDC), S. Laha (GSFC/UMBC/CRESST), D. M. Palmer (LANL), B. Sbarufatti (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team: At 01:52:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200919A (trigger=996503). Swift did not slew due to an observing constraint. The BAT on-board calculated location is RA, Dec 168.916, +32.457 which is RA(J2000) = 11h 15m 40s Dec(J2000) = +32d 27' 25" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single complex peak structure with a duration of about 40 sec. The peak count rate was ~1600 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 05:40 UT on 2020 October 10. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta 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: 28455 SUBJECT: Swift GRB200919.08: Global MASTER-Net observations report DATE: 20/09/19 02:02:24 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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB200919.08 (trigger No 996503,11h 15m 39.84s , +32d 27m 25.2s, R=0.05) errorbox 15 sec after notice time and 83 sec after trigger time at 2020-09-19 01:53:44 UT, with upper limit up to 17.1 mag. The observations began at zenith distance = 79 deg. The sun altitude is -17.1 deg. The galactic latitude b = 69 deg., longitude l = 193 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1444350 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 93 | MASTER-Tavrida | C | 20 | 16.3 | 118 | MASTER-Tavrida | C | 70 | 16.9 | Coadd 134 | MASTER-Tavrida | C | 20 | 16.3 | 179 | MASTER-Tavrida | C | 30 | 16.3 | 235 | MASTER-Tavrida | C | 40 | 16.8 | 300 | MASTER-Tavrida | C | 50 | 16.9 | 381 | MASTER-Tavrida | C | 70 | 17.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28458 SUBJECT: GRB 200919A: Swift-BAT refined analysis DATE: 20/09/19 17:27:57 GMT FROM: Amy Lien at GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200919A (trigger #996503) (Ukwatta et al., GCN Circ. 28454). The BAT ground-calculated position is RA, Dec = 168.899, 32.456 deg which is RA(J2000) = 11h 15m 35.7s Dec(J2000) = +32d 27' 21.8" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 62%. The mask-weighted light curve shows several overlapping pulses that start at ~T-60 s and end at ~T+25 s. The main peak occurs at ~T+5 s. T90 (15-350 keV) is 76.0 +- 6.9 sec (estimated error including systematics). The time-averaged spectrum from T-61.47 to T+24.54 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.13 +- 0.14. The fluence in the 15-150 keV band is 1.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.30 sec in the 15-150 keV band is 1.2 +- 0.2 ph/cm2/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/996503/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28460 SUBJECT: GRB 200919A: CrAO/ZTSh early optical upper limit DATE: 20/09/19 21:12:19 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN: We observed the GRB 200919A (Ukwatta et al., GCN 28454) with ZTSH 2.6m telescope of CrAO observatory starting on 2020-09-19 (UT) 02:26:25. We do not detect any new evident object in the BAT GRB 200919A localization field (Ukwatta et al., GCN 28454). Preliminary photometry of the field is following Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2020-09-19 02:26:25 0.02541 R 30*10 n/d n/d 19.8 The photometry is based on nearby USNO-B1.0 stars USNO-B1.0_id R2 1224-0243383 15.75 1224-0243414 15.12