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GRB 210709A

GCN Circular 30427

Subject
GRB 210709A: Fermi GBM Final Real-time Localization
Date
2021-07-09T04:59:22Z (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 04:49:04 UT on 9 Jul 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210709A (trigger 647498949.307986 / 210709201).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 295.3, Dec = -44.2 (J2000 degrees, equivalent to J2000 19h 41m, -44d 12'), with a statistical uncertainty of 3.9 degrees.

The angle from the Fermi LAT boresight is 75.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210709201/quicklook/glg_skymap_all_bn210709201.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/bn210709201/quicklook/glg_healpix_all_bn210709201.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210709201/quicklook/glg_lc_medres34_bn210709201.gif

GCN Circular 30428

Subject
Fermi GRB 210709A: Global MASTER-Net observations report
Date
2021-07-09T06:00:08Z (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 210709A ( Fermi GBM team, GCN 30427) errorbox  121 sec after notice time and 150 sec after trigger time at 2021-07-09 04:51:34 UT, with upper limit up to  16.2 mag. Observations started at twilight.  The observations began at zenith distance = 85 deg. The sun  altitude  is -16.2 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 210709A errorbox  162 sec after notice time and 191 sec after trigger time at 2021-07-09 04:52:15 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 15 deg. The sun  altitude  is -80.9 deg. 

The galactic latitude b = -28 deg., longitude l = 355 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1656291

We obtain a following upper limits.  

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

     165 | 2021-07-09 04:51:34 |          MASTER-IAC | (19h 53m 28.95s , -45d 39m 58.5s) |  P| |    30 | 16.0 |        
     165 | 2021-07-09 04:51:34 |          MASTER-IAC | (19h 52m 20.20s , -45d 33m 36.3s) |  P- |    30 | 15.0 |        
     206 | 2021-07-09 04:52:15 |         MASTER-OAFA | (19h 50m 50.37s , -44d 56m 51.2s) |   C |    30 | 17.8 |        
     220 | 2021-07-09 04:52:24 |          MASTER-IAC | (19h 53m 28.65s , -45d 38m 59.8s) |  P| |    40 | 16.0 |        
     220 | 2021-07-09 04:52:24 |          MASTER-IAC | (19h 52m 19.93s , -45d 32m 38.3s) |  P- |    40 | 15.2 |        
     261 | 2021-07-09 04:53:04 |         MASTER-OAFA | (19h 50m 47.04s , -44d 55m 48.4s) |   C |    40 | 18.1 |        
     285 | 2021-07-09 04:53:24 |          MASTER-IAC | (19h 53m 35.38s , -45d 40m 01.8s) |  P| |    50 | 16.2 |        
     285 | 2021-07-09 04:53:24 |          MASTER-IAC | (19h 52m 26.65s , -45d 33m 40.9s) |  P- |    50 | 15.1 |        
     325 | 2021-07-09 04:54:04 |         MASTER-OAFA | (19h 50m 46.92s , -44d 57m 13.3s) |   C |    50 | 18.2 |        
     360 | 2021-07-09 04:54:34 |          MASTER-IAC | (19h 53m 29.54s , -45d 41m 03.4s) |  P| |    60 | 16.2 |        
     360 | 2021-07-09 04:54:34 |          MASTER-IAC | (19h 52m 20.76s , -45d 34m 42.9s) |  P- |    60 | 15.2 |        
     400 | 2021-07-09 04:55:14 |         MASTER-OAFA | (19h 50m 50.12s , -44d 55m 29.0s) |   C |    60 | 18.4 |        
     637 | 2021-07-09 04:58:40 |          MASTER-IAC | (19h 39m 58.96s , -44d 16m 07.4s) |  P| |   120 | 15.8 |        
     637 | 2021-07-09 04:58:40 |          MASTER-IAC | (19h 38m 52.40s , -44d 09m 49.2s) |  P- |   120 | 13.6 |        
     684 | 2021-07-09 04:59:28 |         MASTER-OAFA | (19h 37m 03.50s , -43d 35m 29.7s) |   C |   120 | 18.6 |        
     834 | 2021-07-09 05:01:48 |         MASTER-OAFA | (19h 37m 10.23s , -43d 35m 29.7s) |   C |   140 | 18.8 |        
     962 | 2021-07-09 05:03:40 |          MASTER-IAC | (19h 39m 48.98s , -44d 16m 42.0s) |  P| |   170 | 14.9 |        
    1009 | 2021-07-09 05:04:28 |         MASTER-OAFA | (19h 37m 06.16s , -43d 34m 06.7s) |   C |   170 | 18.9 |        
    1204 | 2021-07-09 05:07:37 |         MASTER-OAFA | (19h 37m 06.08s , -43d 35m 44.2s) |   C |   180 | 18.9 |        
Filter C is a clear (unfiltred) band. 


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

GCN Circular 30446

Subject
GRB 210709A: AstroSat CZTI detection
Date
2021-07-12T04:44:57Z (4 years ago)
From
Gaurav Waratkar at IIT,Bombay <gauravwaratkar@iitb.ac.in>
V. Prasad (IUCAA), P. Sawant (IUCAA), G. Waratkar (IITB), A. Vibhute
(IUCAA), V. Bhalerao (IITB), D. Bhattacharya (IUCAA), A. R. Rao
(IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat
CZTI collaboration:

Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al,
2020, arxiv:2011.07067) showed detection of a long GRB 210709A, which
was also detected by Fermi-GBM (GCN 30427).

The source was clearly detected in the 20-200 keV energy range. The
light curve showed multiple peaks of emission with the strongest peak at
2021-07-09 04:49:04.5 UT. The measured peak count rate associated with
the burst is 201 (+40, -42) cts/s above the background in the combined
data of four quadrants, with a total of 909 (+221, -239) cts. The local
mean background count rate was 386 (+4, -4) cts/s. Using cumulative
rates, we measure a T90 of 14 (+4, -4) s. 

It was also detected in the CsI anticoincidence (Veto) detector in the
100-500 keV energy range. 

CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=grb [1]. CZTI is built by a TIFR-led
consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC,
and PRL. The Indian Space Research Organisation funded, managed, and
facilitated the project. 

Links:
------
[1] http://astrosat.iucaa.in/czti/?q=grb
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