GRB 201229B

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

At 15:20:12 UT on 29 Dec 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201229B (trigger 630948017.705592 / 201229639).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 340.4, Dec = -52.0 (J2000 degrees, equivalent to J2000 22h 41m, -52d 00'), with a statistical uncertainty of 1.3 degrees.

The angle from the Fermi LAT boresight is 19.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201229639/quicklook/glg_skymap_all_bn201229639.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/bn201229639/quicklook/glg_healpix_all_bn201229639.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201229639/quicklook/glg_lc_medres34_bn201229639.gif

B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
630948017 at 15:20:12 on 29 Dec. 2020 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).

The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 341.8+/-2.3 deg
Decl.(2000.0) = -52.8+/-1.3 deg
We estimate an additional systematic error of 2 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB201229639/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB201229639/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB201229639/json

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-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 201229B ( Fermi GBM team, GCN 29194
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 ) errorbox  15696 sec after notice time and 15741 sec after trigger time at 2020-12-29 19:42:34 UT, with upper limit up to  17.8 mag. The observations began at zenith distance = 59 deg. The sun  altitude  is -20.2 deg. 

The galactic latitude b = -56 deg., longitude l = 338 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1514878

We obtain a following upper limits.  

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

   15772 | 2020-12-29 19:42:34 |         MASTER-SAAO | (22h 22m 49.08s , -52d 05m 54.8s) |   C |    60 | 17.6 |        
   15932 | 2020-12-29 19:45:14 |         MASTER-SAAO | (22h 32m 27.56s , -54d 04m 14.0s) |   C |    60 | 17.8 |        
   16096 | 2020-12-29 19:47:58 |         MASTER-SAAO | (22h 40m 43.06s , -50d 04m 29.3s) |   C |    60 | 17.4 |        
   16176 | 2020-12-29 19:49:18 |         MASTER-SAAO | (22h 48m 53.55s , -52d 05m 05.3s) |   C |    60 | 17.8 |        
Filter C is a clear (unfiltred) band. 


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