Gamma-ray Burst 211225A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/MAXI NOTICE
NOTICE_DATE:     Sat 25 Dec 21 04:34:19 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:      9573117444
EVENT_RA:        126.59d {+08h 26m 22s} (J2000),
                 126.86d {+08h 27m 27s} (current),
                 125.98d {+08h 23m 55s} (1950)
EVENT_DEC:        -7.33d {-07d 19' 47"} (J2000),
                  -7.40d {-07d 24' 10"} (current),
                  -7.17d {-07d 09' 54"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      555.0 +- 0.0 [mCrab]
EVENT_DATE:      19573 TJD;   359 DOY;   21/12/25
EVENT_TIME:      12158.00 SOD {03:22:38.00} UT
EVENT_TSCALE:    1s
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:       273.92d {+18h 15m 41s}  -23.39d {-23d 23' 12"}
SUN_DIST:        135.46 [deg]
MOON_POSTN:      164.11d {+10h 56m 28s}  +12.36d {+12d 21' 38"}
MOON_DIST:        41.97 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      230.96, 17.28 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      131.01,-25.71 [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 25 Dec 21 04:37:29 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:      9573117444
EVENT_RA:        126.93d {+08h 27m 42s} (J2000),
                 127.20d {+08h 28m 47s} (current),
                 126.31d {+08h 25m 15s} (1950)
EVENT_DEC:        -7.18d {-07d 10' 36"} (J2000),
                  -7.25d {-07d 15' 01"} (current),
                  -7.01d {-07d 00' 38"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      231.0 +- 0.0 [mCrab]
EVENT_DATE:      19573 TJD;   359 DOY;   21/12/25
EVENT_TIME:      12158.00 SOD {03:22:38.00} UT
EVENT_TSCALE:    1s
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:       273.92d {+18h 15m 42s}  -23.39d {-23d 23' 11"}
SUN_DIST:        135.33 [deg]
MOON_POSTN:      164.14d {+10h 56m 34s}  +12.35d {+12d 20' 58"}
MOON_DIST:        41.63 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      231.01, 17.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      131.32,-25.48 [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 25 Dec 21 04:49:32 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:      9573117444
EVENT_RA:        126.92d {+08h 27m 42s} (J2000),
                 127.19d {+08h 28m 46s} (current),
                 126.31d {+08h 25m 14s} (1950)
EVENT_DEC:        -7.18d {-07d 10' 54"} (J2000),
                  -7.26d {-07d 15' 20"} (current),
                  -7.02d {-07d 00' 56"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      203.0 +- 0.0 [mCrab]
EVENT_DATE:      19573 TJD;   359 DOY;   21/12/25
EVENT_TIME:      12158.00 SOD {03:22:38.00} UT
EVENT_TSCALE:    1s
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:       273.93d {+18h 15m 44s}  -23.39d {-23d 23' 10"}
SUN_DIST:        135.33 [deg]
MOON_POSTN:      164.24d {+10h 56m 58s}  +12.31d {+12d 18' 25"}
MOON_DIST:        41.70 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:      231.01, 17.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      131.32,-25.48 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.

GCN Circular #31303
T. Kurihara (JAXA), H. Negoro, M. Nakajima, K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Mihara, T. Tamagawa, J. Li, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu, M. Iwasaki (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa, Y. Imai, N. Ito, Y. Takamatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu, K. Inaba (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), T. Kawamuro (UDP/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 03:22:28 UT on 2021 December 25. Assuming that the source flux was constant over the transit, we obtain the source position at
(R.A., Dec) = (126.923 deg, -7.182 deg) = (08 27 41, -07 10 55) (J2000)
with a statistical 90% C.L. elliptical error region with long and short radii of 0.20 deg and 0.17 deg, respectively. The roll angle of long axis from the north direction is 40.0 deg counterclockwise. Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners:
```
(R.A., Dec) = (126.189, -7.957) deg = (08 24 45, -07 57 25) (J2000) 
(R.A., Dec) = (126.475, -8.145) deg = (08 25 53, -08 08 41) (J2000) 
(R.A., Dec) = (127.569, -6.507) deg = (08 30 16, -06 30 25) (J2000) 
(R.A., Dec) = (127.284, -6.319) deg = (08 29 08, -06 19 08) (J2000) 
```
The X-ray flux averaged over the scan was 203 +- 29 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 01:49 UT with an upper limit of 20 mCrab.
GCN Circular #31304
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, 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 (Irkutsk State University, API),
B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez, M.L.H.Rodriguez (INAOE, OAGH)
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (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 MAXI GRB211225.14 (trigger No 573117444,08h 27m 42.24s , -07d 10m 37.2s, R=1) errorbox 1254 sec after notice time and 5558 sec after trigger time at 2021-12-25 04:55:16 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 43 deg. The sun altitude is -37.9 deg.
The galactic latitude b = 18 deg., longitude l = 231 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1826591
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

    5649 | 2021-12-25 04:55:16 |          MASTER-IAC | (08h 25m 29.91s , -07d 05m 23.5s) |  P| |   180 | 17.9 |        
    5649 | 2021-12-25 04:55:16 |          MASTER-IAC | (08h 26m 26.13s , -07d 11m 22.7s) |  P- |   180 | 17.4 |  
```
The observation and reduction will continue. The message may be cited.
GCN Circular #31310
N. Ito, R. Hosokawa, M. Niwano, K. L. Murata, Y. Imai, Y. Takamatsu, R. Yamaguchi, R. Noto, S. Sato, M. Takaku, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We performed tiling observations for the MAXI/GSC error region of GRB 211225A, MAXI J0827-071 (T. Kurihara et al. GCN Circular #31303, V. Lipunov et al. GCN Circular #31304) with an optical tri-color (g', Rc, and Ic) camera attached to the MITSuME 50 cm telescope Akeno.
The follow up observation started at 2021-12-25 12:43:40 UT, 9.4 hours after the trigger.
Our tiling observation covered almost ~90% of the MAXI/GSC elliptical error region (GCN Circular #31303). Comparing our co-added images with the GSC2.3 catalog, we found no optical transients in the observed region. The 5-sigma upper limits of the co-added images are listed below.
Field num. | center position (R.A., Dec.) | size of field (R.A.(arcmin) x Dec.(arcmin)) | 5-sigma upper limit | MID-UT (UT) | exposure time (sec)
```
--------------------------------------------------------------------------------------------------------------------------
Field 00 | 8:27:04, -7:19:28 | 25.1 x 24.8 | g'>18.1, Rc>18.4, Ic>17.9 | 2021-12-25 15:30:02 | 1260
Field 01 | 8:28:39, -7:19:27 | 26.1 x 25.1 | g'>18.1, Rc>18.4, Ic>17.6 | 2021-12-25 15:36:28 | 1380
Field 02 | 8:27:01, -6:54:21 | 26.3 x 24.0 | g'>18.3, Rc>18.7          | 2021-12-25 16:31:42 | 2400
Field 03 | 8:28:37, -6:54:57 | 26.3 x 24.6 | g'>18.0, Rc>18.4, Ic>17.8 | 2021-12-25 16:48:59 | 1620
--------------------------------------------------------------------------------------------------------------------------
```
We used PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).

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Jochen Greiner, last update: 26-Dec-2021 [Disclaimer]