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GRB 211027A

GCN Circular 31012

Subject

GRB 211027A: Fermi GBM Final Real-time Localization

Date

2021-10-27T06:02:00Z (4 years ago)

From

Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely LONG GRB

At 05:51:52 UT on 27 Oct 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211027A (trigger 657006717.695746 / 211027244).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 278.6, Dec = 19.0 (J2000 degrees, equivalent to J2000 18h 34m, 19d 00'), with a statistical uncertainty of 6.1 degrees.

The angle from the Fermi LAT boresight is 24.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211027244/quicklook/glg_skymap_all_bn211027244.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211027244/quicklook/glg_healpix_all_bn211027244.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211027244/quicklook/glg_lc_medres34_bn211027244.gif

GCN Circular 31015

Subject

Fermi GRB 211027A: Global MASTER-Net observations report

Date

2021-10-27T14:30:18Z (4 years ago)

From

Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, 
D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, 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
(Irkutsk State University, API),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

A. Gabovich, V.Yurkov 
(Blagoveschensk Educational State University)


MASTER-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 211027A ( Fermi GBM team, GCN 31012Loading...
 
 ) errorbox  20879 sec after notice time and 20909 sec after trigger time at 2021-10-27 11:40:21 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 40 deg. The sun  altitude  is -17.7 deg. 

The galactic latitude b = 12 deg., longitude l = 48 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1767399

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   20939 | 2021-10-27 11:40:21 |        MASTER-Tunka | (18h 36m 12.97s , +21d 29m 21.2s) |   C |    60 | 17.8 |        
   21118 | 2021-10-27 11:43:20 |        MASTER-Tunka | (18h 45m 24.29s , +18d 22m 36.6s) |   C |    60 | 16.9 |  Coadd 
   21186 | 2021-10-27 11:44:28 |        MASTER-Tunka | (18h 29m 19.97s , +18d 24m 29.9s) |   C |    60 | 17.6 |  Coadd 
   21186 | 2021-10-27 11:44:28 |        MASTER-Tunka | (18h 27m 33.61s , +19d 36m 05.7s) |   C |    60 | 17.9 |  Coadd 
   21420 | 2021-10-27 11:48:22 |        MASTER-Tunka | (18h 24m 11.62s , +21d 29m 09.0s) |   C |    60 | 16.6 |  Coadd 
   21492 | 2021-10-27 11:49:34 |        MASTER-Tunka | (18h 49m 34.73s , +16d 30m 18.6s) |   C |    60 | 16.2 |  Coadd 
   21565 | 2021-10-27 11:50:47 |        MASTER-Tunka | (18h 23m 53.87s , +22d 11m 32.4s) |   C |    60 | 16.6 |  Coadd 
   21637 | 2021-10-27 11:51:59 |        MASTER-Tunka | (18h 39m 17.95s , +14d 34m 17.0s) |   C |    60 | 17.0 |  Coadd 
   21710 | 2021-10-27 11:53:12 |        MASTER-Tunka | (18h 39m 32.42s , +24d 04m 40.4s) |   C |    60 | 17.6 |  Coadd 
   21710 | 2021-10-27 11:53:12 |        MASTER-Tunka | (18h 37m 44.64s , +25d 15m 57.9s) |   C |    60 | 18.0 |  Coadd 
   21918 | 2021-10-27 11:56:41 |        MASTER-Tunka | (18h 38m 00.98s , +20d 18m 12.5s) |   C |    60 | 16.8 |  Coadd 
   21919 | 2021-10-27 11:56:41 |        MASTER-Tunka | (18h 36m 14.32s , +21d 29m 31.3s) |   C |    60 | 16.9 |  Coadd 
   21987 | 2021-10-27 11:57:49 |        MASTER-Tunka | (18h 46m 24.98s , +20d 17m 10.7s) |   C |    60 | 17.0 |  Coadd 
   21987 | 2021-10-27 11:57:49 |        MASTER-Tunka | (18h 43m 32.47s , +19d 35m 27.7s) |   C |    60 | 16.8 |  Coadd 
   22214 | 2021-10-27 12:01:36 |        MASTER-Tunka | (19h 01m 17.87s , +18d 21m 56.9s) |   C |    60 | 16.5 |  Coadd 
   22214 | 2021-10-27 12:01:36 |        MASTER-Tunka | (18h 59m 32.63s , +19d 33m 15.7s) |   C |    60 | 16.8 |  Coadd 
   22286 | 2021-10-27 12:02:49 |        MASTER-Tunka | (18h 40m 18.67s , +22d 10m 29.4s) |   C |    60 | 16.4 |  Coadd 
   22576 | 2021-10-27 12:07:38 |        MASTER-Tunka | (18h 23m 48.64s , +22d 11m 05.2s) |   C |    60 | 16.7 |  Coadd 
   22779 | 2021-10-27 12:11:02 |        MASTER-Tunka | (18h 58m 22.62s , +20d 15m 45.8s) |   C |    60 | 17.3 |  Coadd 
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.