Gamma-ray Burst 210102B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/MAXI NOTICE
NOTICE_DATE:     Sat 02 Jan 21 09:30:01 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:      9216347865
EVENT_RA:        353.32d {+23h 33m 17s} (J2000),
                 353.60d {+23h 34m 23s} (current),
                 352.67d {+23h 30m 41s} (1950)
EVENT_DEC:       -21.09d {-21d 05' 08"} (J2000),
                 -20.97d {-20d 58' 10"} (current),
                 -21.36d {-21d 21' 43"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      426.0 +- 0.0 [mCrab]
EVENT_DATE:      19216 TJD;     2 DOY;   21/01/02
EVENT_TIME:      32650.00 SOD {09:04:10.00} UT
EVENT_TSCALE:    10s
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:       283.27d {+18h 53m 04s}  -22.88d {-22d 52' 30"}
SUN_DIST:         64.61 [deg]
MOON_POSTN:      145.12d {+09h 40m 29s}  +18.79d {+18d 47' 14"}
MOON_DIST:       153.17 [deg]
MOON_ILLUM:      89 [%]
GAL_COORDS:       47.45,-71.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      345.33,-16.67 [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:     Sat 02 Jan 21 13:46:55 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:      9216347865
EVENT_RA:        353.48d {+23h 33m 55s} (J2000),
                 353.75d {+23h 35m 01s} (current),
                 352.82d {+23h 31m 18s} (1950)
EVENT_DEC:       -21.25d {-21d 15' 00"} (J2000),
                 -21.13d {-21d 08' 01"} (current),
                 -21.53d {-21d 31' 34"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      157.0 +- 0.0 [mCrab]
EVENT_DATE:      19216 TJD;     2 DOY;   21/01/02
EVENT_TIME:      32650.00 SOD {09:04:10.00} UT
EVENT_TSCALE:    10s
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:       283.46d {+18h 53m 51s}  -22.86d {-22d 51' 30"}
SUN_DIST:         64.54 [deg]
MOON_POSTN:      147.52d {+09h 50m 05s}  +18.10d {+18d 05' 49"}
MOON_DIST:       155.13 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:       47.14,-71.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      345.39,-16.88 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.

GCN Circular #29223
C. Guo (RIKEN), M. Serino (AGU), H. Negoro, 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. Yamada, 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 on a bright uncatalogued X-ray transient source at 2021-01-02T09:03:48 UT. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (353.323 deg, -21.086 deg) = (23 33 18, -21 05 10) (J2000) with a statistical 90% C.L. circular error region with a radius of 0.5 deg. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 238 +- 31 mCrab (2.0-4.0keV, 1 sigma error). There was no significant excess flux in the next transit at 10:36 UT with an upper limit of 20 mCrab.
GCN Circular #29224
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a series of observations, tiled on the sky, of the MAXI GRB 210102B. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00097
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the MAXI event is high: any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #29225
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 MAXI GRB210102.38 (trigger No 216347865,23h 33m 17.52s , -21d 05m 09.6s, R=1) errorbox 20657 sec after notice time and 22218 sec after trigger time at 2021-01-02 15:14:28 UT, with upper limit up to 18.6 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -10.2 deg.
The galactic latitude b = -72 deg., longitude l = 49 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1517221
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   22308 | 2021-01-02 15:14:28 |      MASTER-Tavrida | (23h 38m 28.04s , -21d 16m 44.6s) |   C |   180 | 16.5 |        
   22447 | 2021-01-02 15:17:47 |      MASTER-Tavrida | (23h 40m 11.97s , -22d 12m 44.8s) |   C |    60 | 16.8 |        
   22447 | 2021-01-02 15:17:47 |      MASTER-Tavrida | (23h 33m 48.28s , -22d 08m 48.5s) |   C |    60 | 17.1 |        
   23188 | 2021-01-02 15:29:07 |      MASTER-Tavrida | (23h 38m 29.61s , -21d 16m 08.3s) |   C |   180 | 18.0 |        
   23188 | 2021-01-02 15:29:07 |      MASTER-Tavrida | (23h 32m 05.67s , -21d 12m 28.7s) |   C |   180 | 17.8 |        
   23327 | 2021-01-02 15:32:27 |      MASTER-Tavrida | (23h 38m 17.21s , -20d 11m 56.3s) |   C |    60 | 17.9 |        
   23327 | 2021-01-02 15:32:27 |      MASTER-Tavrida | (23h 31m 55.64s , -20d 08m 18.0s) |   C |    60 | 18.3 |        
   23407 | 2021-01-02 15:33:46 |      MASTER-Tavrida | (23h 40m 12.49s , -22d 11m 02.2s) |   C |    60 | 18.0 |        
   23407 | 2021-01-02 15:33:46 |      MASTER-Tavrida | (23h 33m 45.80s , -22d 07m 25.1s) |   C |    60 | 18.4 |        
   23546 | 2021-01-02 15:35:05 |      MASTER-Tavrida | (23h 38m 28.70s , -21d 17m 17.2s) |   C |   180 | 18.6 |        
   23546 | 2021-01-02 15:35:05 |      MASTER-Tavrida | (23h 32m 04.24s , -21d 13m 40.4s) |   C |   180 | 18.6 |
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #29230
D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the MAXI-detected burst GRB 210102B (Guo et al. GCN Circ. 29223) in a series of observations tiled on the sky. The total exposure time is 1.3 ks, distributed over 7 tiles; the maximum exposure at a single sky location was 406 s. The data were collected between T0+19.7 ks and T0+26.0 ks, and are entirely in Photon Counting (PC) mode.
One uncatalogued X-ray source has been detected, it is below the RASS limit and shows no definitive signs of fading. Therefore, at the present time we cannot confirm this as the afterglow. Details of this source are given below:
Source 1:
```
  RA (J2000.0):  353.8173  =  23:35:16.14
  Dec (J2000.0): -21.0821  =  -21:04:55.6
  Error: 5.5 arcsec (radius, 90% conf.)
  Count-rate: 0.030 [+0.016, -0.012] ct s^-1   
  Distance: 1289 arcsec from MAXI position.
```
The results of the XRT-team automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00097.
This circular is an official product of the Swift-XRT team.
GCN Circular #29240
A. Pozanenko (IKI), S. Belkin (IKI), V. Kim (FAI, Pulkovo Observatory), M. Krugov (FAI) report on behalf of GRB IKI FuN:
We observed MAXI GRB 210102B (Guo et al., GCN 29223) with AZT-20 telescope of Assy-Turgen observatory starting on Jan. 03 (UT) 13:00:53. i.e. ~1.6 days after trigger. At the place of the only one of XRT candidates (Burrows et al., GCN 29230) in the localization area of MAXI (Guo et al., GCN 29223) we clearly detect the optical object in coordinates (J2000) 23:35:15.88 -21:04:55.5 with uncertainness of 0.6 arcsec in both coordinates. Preliminary photometry of the object is following
```
Date       UT start  t-T0    Filter  Exp.    OT   Err.  UL (3sigma)
                      (mid, days)      (s)

2021-01-03 13:00:53  1.19068  r'(AB)  75*60  22.2 0.2   23.0
```
The photometry is based on the stars of PanSTARRS-PS1
```
RA DEC r'
23:35:20.67802 -21:04:16.4688 19.656
23:35:47.99017 -21:11:53.6544 17.807
```
At this tome we cannot confirm variability of the source. We can suggest the object might be related to GRB 210102B.
GCN Circular #29242
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) was pointed to the Swift GRB210104.88 (trigger No 1015919,03h 34m 24.24s , +37d 55m 51.6s, R=0.05) errorbox 5 sec after notice time and 59 sec after trigger time at 2021-01-04 21:11:10 UT, with upper limit up to 15.1 mag. The observations began at zenith distance = 33 deg. The sun altitude is -67.4 deg.
The galactic latitude b = -14 deg., longitude l = 155 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1518656
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      65 |      MASTER-Tavrida |   C |    10 | 14.6 |        
      65 |      MASTER-Tavrida |   C |    10 | 14.9 |        
      99 |      MASTER-Tavrida |   C |    20 | 14.9 |        
      99 |      MASTER-Tavrida |   C |    20 | 15.1 |
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #29244
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a series of observations, tiled on the sky, of the MAXI GRB 210102B. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00098
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the MAXI event is high: any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #29270
A. Pozanenko (IKI), S. Belkin (IKI), V. Kim (FAI, Pulkovo Observatory), M. Krugov (FAI) report on behalf of GRB IKI FuN:
We continued observations of XRT candidate (Burrows et al., GCN 29230) of MAXI GRB 210102B (Guo et al., GCN 29223) with AZT-20 telescope of Assy-Turgen observatory starting on Jan. 05 (UT) 13:00:53, i.e. ~3.2 days after trigger. At the place of the only one of XRT candidate (Burrows et al., GCN 29230) we do not detect the optical object found early (Pozanenko et al., GCN 29240). Preliminary photometry of the field is following
```
Date       UT start  t-T0    Filter    Exp.   OT  Err.  UL (3sigma)
                      (mid, days)      (s)

2021-01-05 13:00:53   3.20177   r'(AB) 76*60  n/d n/d   23.1
```
The photometry is based on the stars of PanSTARRS-PS1
```
RA DEC r'
23:35:20.67802 -21:04:16.4688 19.656
23:35:47.99017 -21:11:53.6544 17.807
```
We confirm the optical object reported in GCN 29240 as an afterglow of GRB 210102B.
GCN Circular #29271
P. D'Avanzo, M.G. Bernardini, A. Melandri, T. Sbarrato (INAF-OAB), P.A. Evans (U. Leicester) and A. Y. Lien (GSFC/UMBC) report on behalf of the Swift-XRT team:
Swift-XRT obtained further observations of the field of the MAXI-detected burst GRB 210102B (Guo et al. GCN Circ. 29223). The data were collected between T0+209.5 ks and T0+312.5 ks for a total exposure time of 2.5 ks, and are entirely in Photon Counting (PC) mode.
Source 1 (Burrows et al., GCN Circ. 29230) is not detected down to a 3sigma upper limit of 0.004 ct/s. The source therefore has faded (with 2.2 sigma significance) with respect to the previous detection level (0.030 [+0.016, -0.012] ct s^-1 between T0+19.7 ks and T0+26.0 ks; Burrows et al., GCN Circ. 29230).
We propose this source as the GRB X-ray afterglow, in agreement with the results of the optical observations reported by Pozanenko et al. (GCN Circ. 29270).

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Jochen Greiner, last update: 06-Jan-2021 [Disclaimer]