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GRB 210101A

GCN Circular 29215

Subject

GRB 210101A: Fermi GBM Final Real-time Localization

Date

2021-01-01T15:03:31Z (5 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 14:53:06 UT on 1 Jan 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210101A (trigger 631205591.859738 / 210101620).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 136.7, Dec = 50.1 (J2000 degrees, equivalent to J2000 09h 06m, 50d 06'), with a statistical uncertainty of 4.6 degrees.

The angle from the Fermi LAT boresight is 147.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210101620/quicklook/glg_skymap_all_bn210101620.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/bn210101620/quicklook/glg_healpix_all_bn210101620.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210101620/quicklook/glg_lc_medres34_bn210101620.gif

GCN Circular 29216

Subject

GRB 210101A: BALROG localization (Fermi Trigger 631205591 / GRB 210101620)

Date

2021-01-01T17:05:32Z (5 years ago)

From

Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>

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

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
631205591 at 14:53:06 on 01 Jan. 2021 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) = 149.6+/-3.8 deg
Decl.(2000.0) = 53.1+/-2.4 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB210101620/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB210101620/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB210101620/json

GCN Circular 29222

Subject

Fermi GRB 210101A: Global MASTER-Net observations report

Date

2021-01-02T04:00:09Z (5 years ago)

From

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

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) started inspect of the Fermi GRB 210101A ( Fermi GBM team, GCN 29215Loading...
 
 ) errorbox  19545 sec after notice time and 19603 sec after trigger time at 2021-01-01 20:19:50 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 35 deg. The sun  altitude  is -62.4 deg. 

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) started inspect of the Fermi GRB 210101A errorbox  38568 sec after notice time and 38626 sec after trigger time at 2021-01-02 01:36:52 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 36 deg. The sun  altitude  is -81.5 deg. 

The galactic latitude b = 42 deg., longitude l = 169 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1516794

We obtain a following upper limits.  

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

   19633 | 2021-01-01 20:19:50 |      MASTER-Tavrida | (08h 53m 10.40s , +56d 17m 44.1s) |   C |    60 | 18.0 |        
   19633 | 2021-01-01 20:19:50 |      MASTER-Tavrida | (09h 03m 54.67s , +56d 15m 14.2s) |   C |    60 | 18.2 |        
   20536 | 2021-01-01 20:34:53 |      MASTER-Tavrida | (08h 53m 01.80s , +56d 17m 48.0s) |   C |    60 | 18.2 |        
   20536 | 2021-01-01 20:34:53 |      MASTER-Tavrida | (09h 03m 45.63s , +56d 15m 32.5s) |   C |    60 | 18.1 |        
   38656 | 2021-01-02 01:36:52 |          MASTER-IAC | (09h 23m 12.29s , +56d 10m 19.9s) |   C |    60 | 18.2 |        
   43403 | 2021-01-02 02:56:00 |      MASTER-Tavrida | (08h 44m 09.21s , +53d 57m 34.6s) |   C |    60 | 18.0 |        
   43403 | 2021-01-02 02:56:00 |      MASTER-Tavrida | (08h 33m 51.91s , +54d 00m 03.2s) |   C |    60 | 17.7 |        
   44349 | 2021-01-02 03:11:45 |      MASTER-Tavrida | (08h 44m 05.63s , +53d 56m 08.2s) |   C |    60 | 18.0 |        
   44349 | 2021-01-02 03:11:45 |      MASTER-Tavrida | (08h 33m 52.43s , +53d 58m 37.8s) |   C |    60 | 18.0 |        
   45423 | 2021-01-02 03:29:40 |      MASTER-Tavrida | (08h 44m 05.11s , +53d 57m 15.1s) |   C |    60 | 18.0 |        
   45423 | 2021-01-02 03:29:40 |      MASTER-Tavrida | (08h 33m 50.61s , +54d 00m 16.0s) |   C |    60 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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