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GRB 210105A

GCN Circular 29261

Subject

GRB 210105A: Fermi GBM Final Real-time Localization

Date

2021-01-05T16:13:24Z (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 16:03:05 UT on 5 Jan 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210105A (trigger 631555390.920328 / 210105669).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 71.0, Dec = -36.8 (J2000 degrees, equivalent to J2000 04h 44m, -36d 47'), with a statistical uncertainty of 9.6 degrees.

The angle from the Fermi LAT boresight is 65.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210105669/quicklook/glg_skymap_all_bn210105669.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/bn210105669/quicklook/glg_healpix_all_bn210105669.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210105669/quicklook/glg_lc_medres34_bn210105669.gif

GCN Circular 29264

Subject

Fermi GRB 210105A: Global MASTER-Net observations report

Date

2021-01-05T20:30:09Z (4 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-IAC robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Spain (IAC Teide Observatory) started inspect of the Fermi GRB 210105A ( Fermi GBM team, GCN 29261Loading...
 
 ) errorbox  11240 sec after notice time and 11295 sec after trigger time at 2021-01-05 19:11:21 UT, with upper limit up to  18.5 mag. Observations started at twilight.  The observations began at zenith distance = 77 deg. The sun  altitude  is -11.0 deg. 

The galactic latitude b = -40 deg., longitude l = 239 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1519938

We obtain a following upper limits.  

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

   11326 | 2021-01-05 19:11:21 |          MASTER-IAC | (04h 40m 37.16s , -30d 00m 42.3s) |   C |    60 | 14.9 |        
   11326 | 2021-01-05 19:11:21 |          MASTER-IAC | (04h 31m 18.61s , -29d 56m 05.8s) |   C |    60 | 15.6 |        
   11405 | 2021-01-05 19:12:41 |          MASTER-IAC | (04h 30m 25.22s , -26d 01m 59.9s) |   C |    60 | 16.6 |        
   12227 | 2021-01-05 19:26:23 |          MASTER-IAC | (04h 40m 44.73s , -30d 02m 48.9s) |   C |    60 | 17.0 |        
   12227 | 2021-01-05 19:26:23 |          MASTER-IAC | (04h 31m 25.39s , -29d 58m 12.6s) |   C |    60 | 17.1 |        
   12307 | 2021-01-05 19:27:43 |          MASTER-IAC | (04h 30m 21.85s , -26d 01m 27.7s) |   C |    60 | 18.2 |        
   13048 | 2021-01-05 19:40:04 |          MASTER-IAC | (04h 35m 50.16s , -40d 03m 02.2s) |   C |    60 | 16.9 |        
   13048 | 2021-01-05 19:40:04 |          MASTER-IAC | (04h 25m 17.91s , -39d 58m 24.3s) |   C |    60 | 17.1 |        
   15230 | 2021-01-05 20:16:26 |          MASTER-IAC | (04h 40m 38.58s , -30d 00m 38.9s) |   C |    60 | 18.3 |        
   15230 | 2021-01-05 20:16:26 |          MASTER-IAC | (04h 31m 17.88s , -29d 56m 09.0s) |   C |    60 | 17.8 |        
   15310 | 2021-01-05 20:17:45 |          MASTER-IAC | (04h 30m 26.00s , -26d 02m 02.7s) |   C |    60 | 18.5 |        
Filter C is a clear (unfiltred) band. 


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