//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27174 SUBJECT: GRB 200224B: Fermi GBM Final Real-time Localization DATE: 20/02/24 05:16:06 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 05:05:49 UT on 24 Feb 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200224A (trigger 604213554.278888 / 200224212). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 177.9, Dec = -28.9 (J2000 degrees, equivalent to J2000 11h 51m, -28d 53'), with a statistical uncertainty of 3.1 degrees. The angle from the Fermi LAT boresight is 23.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200224212/quicklook/glg_skymap_all_bn200224212.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200224212/quicklook/glg_healpix_all_bn200224212.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200224212/quicklook/glg_lc_medres34_bn200224212.gif [GCN OPS NOTE(24feb20): This is the third Circular in the sequence of 8 circulars which were all labeled A because of the sequence assigner being offline. This circular was orginally, incorrectly labelled A, but the true letter identity is B.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27175 SUBJECT: Fermi trigger No 604213554: Global MASTER-Net observations report DATE: 20/02/24 06:30:11 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), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), 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) started inspect of the Fermi GRB200224.21 (trigger No 604213554,11h 51m 36.00s , -28d 52m 12.0s, R=3.08) errorbox 548 sec after notice time and 579 sec after trigger time at 2020-02-24 05:15:28 UT, with upper limit up to 20.2 mag. The observations began at zenith distance = 13 deg. The sun altitude is -48.7 deg. The galactic latitude b = 32 deg., longitude l = 288 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1296022 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 640 | 2020-02-24 05:15:28 | MASTER-OAFA | (11h 50m 33.57s , -28d 44m 47.1s) | C | 120 | 19.4 | 800 | 2020-02-24 05:15:28 | MASTER-OAFA | (11h 50m 33.57s , -28d 44m 47.1s) | C | 440 | 20.2 | Coadd 801 | 2020-02-24 05:18:00 | MASTER-OAFA | (11h 50m 35.98s , -28d 44m 56.4s) | C | 140 | 19.5 | 992 | 2020-02-24 05:20:51 | MASTER-OAFA | (11h 50m 30.37s , -28d 46m 03.0s) | C | 180 | 19.8 | 1204 | 2020-02-24 05:24:23 | MASTER-OAFA | (11h 50m 36.20s , -28d 45m 57.3s) | C | 180 | 19.8 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. [GCN OPS NOTE(24feb20): This is the fourth Circular in the sequence of 8 circulars which were all (except this one) labeled A because of the sequence assigner being offline. In the normal lettering method this would be burst B.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27181 SUBJECT: Correction in name: GRB 200224B and GRB 200224C (not GRB 200224A) DATE: 20/02/24 21:32:30 GMT FROM: Stephen Lesage at Fermi-GBM Team S. Lesage (UAH) reports on behalf of the Fermi GBM Team: “The Fermi Gamma-ray Burst Monitor (GBM) triggers 604213554/200224212 at 05:05:49 UT and 604231129/200224416 at 09:58:44 on 24 Feb 2020, originally named GRB 200224A in GCN 27174 and GCN 27178, should be GRB 200224B and GRB 200224C respectively. We apologize for any confusion caused." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27215 SUBJECT: GRB 200224B: DDOTI/OAN optical observations report DATE: 20/02/26 00:30:12 GMT FROM: Emma Margarita Pereyra Talamantes at IA-UNAM Ensenada Margarita Pereyra (UNAM), Nat Butler (ASU), Alan M. Watson (UNAM), Eleonora Troja (GSFC/UMD), Simone Dichiara (GSFC/UMD), Rosa L. Becerra (UNAM), William H. Lee (UNAM), Diego Gonzalez (UNAM), Alexander Kutyrev (GSFC/UMD), and Tanner Wolfram (ASU), report: We observed the field of GRB 200224B detected by the Fermi Gamma-ray Burst Monitor (GCN 27174, Fermi trigger 604213554), with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir ( http://ddoti.astroscu.unam.mx) from 2020-02-24 06:47 to 2020-02-24 12:16 UTC (1.68 to 7.16 hours after the event). We observed a region of 13.6 degrees in RA by 20.4 degrees in declination, with a 2 x 2 grid, centered on the Fermi GBM Final Position +11:51:36 -28:52:11 J2000. This region contains about 277 square degrees. We obtained 2040 to 2520 seconds exposure across the region. We calibrated our images against the APASS catalog. Our 10-sigma limiting magnitude is around w = 19.45. Comparing to the USNO-B1, DSS DR2 and Pan-STARRS DR1 catalogs, we do not detect any uncataloged source with significant fading within the 90% probability radius of 6.3 degrees. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir. -- *Dr. Margarita Pereyra * *FFTF, Schlumberger Foundation Alumnae* ---------------------------------------------------------------------------------------------------------------- *Catedrático Conacyt* *Instituto de Astronomía de la UNAM,* *Km. 107 Carretera Tijua**na-Ensenada, * *Ensenada Baja California, México. C.P. 22860* Oficina: 405 Skype: margarita-pereyra