Gamma-ray Burst 210110A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/MAXI NOTICE
  NOTICE_DATE:     Sun 10 Jan 21 15:35:29 UT
  NOTICE_TYPE:     MAXI Unknown Source Position
  EVENT_ID_NUM:      9224516204
  EVENT_RA:        172.66d {+11h 30m 38s} (J2000),
                   172.92d {+11h 31m 40s} (current),
                   172.05d {+11h 28m 12s} (1950)
  EVENT_DEC:       -41.51d {-41d 30' 35"} (J2000),
                   -41.63d {-41d 37' 33"} (current),
                   -41.23d {-41d 14' 01"} (1950)
  EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
  EVENT_FLUX:      287.0 +- 0.0 [mCrab]
  EVENT_DATE:      19224 TJD;    10 DOY;   21/01/10
  EVENT_TIME:      54884.00 SOD {15:14:44.00} UT
  EVENT_TSCALE:    1s
  EVENT_EBAND:     Low, 2-4 keV
  SUN_POSTN:       292.30d {+19h 29m 12s}  -21.85d {-21d 51' 13"}
  SUN_DIST:         95.34 [deg]
  MOON_POSTN:      255.96d {+17h 03m 50s}  -22.69d {-22d 41' 17"}
  MOON_DIST:        70.14 [deg]
  MOON_ILLUM:      8 [%]
  GAL_COORDS:      287.07, 18.86 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      193.32,-40.25 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.
  

• GCN NOTICE
  

  TITLE:           GCN/MAXI NOTICE
  NOTICE_DATE:     Sun 10 Jan 21 16:31:10 UT
  NOTICE_TYPE:     MAXI Unknown Source Position
  EVENT_ID_NUM:      9224516204
  EVENT_RA:        172.73d {+11h 30m 54s} (J2000),
                   172.98d {+11h 31m 56s} (current),
                   172.12d {+11h 28m 28s} (1950)
  EVENT_DEC:       -41.31d {-41d 18' 53"} (J2000),
                   -41.43d {-41d 25' 51"} (current),
                   -41.04d {-41d 02' 19"} (1950)
  EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
  EVENT_FLUX:      127.0 +- 0.0 [mCrab]
  EVENT_DATE:      19224 TJD;    10 DOY;   21/01/10
  EVENT_TIME:      54884.00 SOD {15:14:44.00} UT
  EVENT_TSCALE:    1s
  EVENT_EBAND:     Low, 2-4 keV
  SUN_POSTN:       292.34d {+19h 29m 22s}  -21.85d {-21d 50' 52"}
  SUN_DIST:         95.45 [deg]
  MOON_POSTN:      256.55d {+17h 06m 12s}  -22.79d {-22d 47' 26"}
  MOON_DIST:        70.50 [deg]
  MOON_ILLUM:      8 [%]
  GAL_COORDS:      287.06, 19.06 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      193.25,-40.06 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.
  

• GCN Circular #29284
  S. Yamada (Kyoto U.), H. Negoro (Nihon U.), M. Serino (AGU), M. Nakajima, M. Aoki, K. Kobayashi, R. Takagi, K, Asakura, K, Seino (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Nishida, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, R. Adachi, M. Niwano, R. Hosokawa (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA), Y. Ueda, S. Ogawa, K. Setoguchi, T. Yoshitake, U. Goto, R. Uematsu (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC) report on behalf of the MAXI team:
  The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at UT 15:14:40 on 2021 January 10. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (172.727 deg, -41.315 deg) = (11 30 54, -41 18 52) (J2000) with a 90% C.L. statistical error of 0.30 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 127 +- 25 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 13:41 UT and in the next transit at 16:47 with an upper limit of 20 mCrab for each.
• GCN Circular #29285
  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 MAXI GRB210110.64 (trigger No 224516204,11h 30m 38.40s , -41d 30m 36.0s, R=1) errorbox 14698 sec after notice time and 15987 sec after trigger time at 2021-01-10 19:41:11 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 80 deg. The sun altitude is -20.2 deg.
  The galactic latitude b = 19 deg., longitude l = 288 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1522841
  We obtain a following upper limits.

  Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
  
     16077 | 2021-01-10 19:41:11 |         MASTER-SAAO | (11h 25m 31.35s , -41d 24m 21.0s) |   C |   180 | 17.4 |
  

  Filter C is a clear (unfiltred) band.
  The observation and reduction will continue. The message may be cited.