Gamma-ray Burst 220514B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/MAXI NOTICE
NOTICE_DATE:     Sun 15 May 22 00:03:19 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:      9713758386
EVENT_RA:        245.75d {+16h 23m 00s} (J2000),
                 245.83d {+16h 23m 19s} (current),
                 245.58d {+16h 22m 20s} (1950)
EVENT_DEC:       +61.66d {+61d 39' 18"} (J2000),
                 +61.60d {+61d 36' 14"} (current),
                 +61.77d {+61d 46' 11"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      320.0 +- 0.0 [mCrab]
EVENT_DATE:      19713 TJD;   134 DOY;   22/05/14
EVENT_TIME:      84267.00 SOD {23:24:27.00} UT
EVENT_TSCALE:    10s
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:        51.80d {+03h 27m 11s}  +18.81d {+18d 48' 40"}
SUN_DIST:         98.81 [deg]
MOON_POSTN:      216.24d {+14h 24m 57s}  -13.00d {-13d 00' 01"}
MOON_DIST:        78.17 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       92.81, 41.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      193.57, 78.43 [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 15 May 22 00:06:08 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:      9713758386
EVENT_RA:        246.86d {+16h 27m 27s} (J2000),
                 246.94d {+16h 27m 46s} (current),
                 246.69d {+16h 26m 47s} (1950)
EVENT_DEC:       +61.44d {+61d 26' 24"} (J2000),
                 +61.39d {+61d 23' 28"} (current),
                 +61.55d {+61d 32' 59"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      168.0 +- 0.0 [mCrab]
EVENT_DATE:      19713 TJD;   134 DOY;   22/05/14
EVENT_TIME:      84267.00 SOD {23:24:27.00} UT
EVENT_TSCALE:    10s
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:        51.80d {+03h 27m 12s}  +18.81d {+18d 48' 42"}
SUN_DIST:         98.88 [deg]
MOON_POSTN:      216.26d {+14h 25m 03s}  -13.01d {-13d 00' 42"}
MOON_DIST:        78.25 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       92.31, 40.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      196.03, 78.73 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.

GCN Circular #32045
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the MAXI GRB220514.98 (trigger No 713758386,16h 23m 00.24s , +61d 39m 18.0s, R=1) errorbox 3 sec after notice time and 2351 sec after trigger time at 2022-05-15 00:03:38 UT, with upper limit up to 14.1 mag. Observations started at twilight. The observations began at zenith distance = 26 deg. The sun altitude is -16.1 deg.
The galactic latitude b = 41 deg., longitude l = 93 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1973402
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

    2441 | 2022-05-15 00:03:38 |   MASTER-Kislovodsk | (16h 22m 23.52s , +62d 09m 20.5s) |   C |   180 | 13.5 |        
    2642 | 2022-05-15 00:06:58 |   MASTER-Kislovodsk | (16h 27m 05.12s , +61d 54m 31.2s) |   C |   180 | 13.6 |        
    2842 | 2022-05-15 00:10:18 |   MASTER-Kislovodsk | (16h 26m 51.71s , +61d 53m 48.2s) |   C |   180 | 14.1 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #32046
Y. Kawakubo (LSU), M. Serino (AGU), H. Negoro, M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Hiramatsu, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, J. Kohara (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, T. Kurihara (JAXA), Y. Ueda, S. Ogawa, K. Setoguchi, T. Yoshitake, K. Inaba (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), K. Yamaoka (Nagoya U.), 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 23:24:21 UT on 2022 May 14. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (246.864 deg, 61.440 deg) = (16 27 27, +61 26 23) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.26 deg and 0.24 deg, respectively. The roll angle of long axis from the north direction is 101.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners:
```
(246.141, 61.757) deg = (16 24 33, +61 45 25) (J2000) 
(245.940, 61.286) deg = (16 23 45, +61 17 09) (J2000) 
(248.119, 61.055) deg = (16 32 28, +61 03 17) (J2000) 
(248.352, 61.523) deg = (16 33 24, +61 31 22) (J2000) 
```
The X-ray flux averaged over the scan was 168 +- 26 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 05/14 21:51 UT with an upper limit of 20 mCrab.
GCN Circular #32048
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 220514B. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00106
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 #32053
A. D'Ai (INAF-IASFPA), J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (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 220514B (Y. Kawakubo et al. GCN Circ. 32046) in a series of observations tiled on the sky. The total exposure time is 1.9 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 1.0 ks. The data were collected between T0+57.9 ks and T0+60.1 ks, and are entirely in Photon Counting (PC) mode.
No X-ray sources have been detected. The 3-sigma upper limit in the field (not including the regions where the tiles overlap) ranges from ~0.02 to ~0.04 ct s^-1, corresponding to a 0.3-10 keV observed flux of 6.7e-13 to 1.4e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
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_GRB00106.
This circular is an official product of the Swift-XRT team.
GCN Circular #32056
A.Ridnaia, D. Frederiks, A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 220514B (MAXI/GSC detection: Kawakubo et al., GCN Circ. 32046) was detected by Konus-Wind (KW) in the waiting mode.
A Bayesian block analysis of the KW waiting mode data in the 20-1500 keV band reveals a ~10 sigma count rate increase over background in the interval from ~T0-26 s to ~T0+74 s, where T0 = T0(MAXI) = 84261 s UT (23:24:21).
The K-W light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB220514B/
As observed by Konus-Wind, the burst had a fluence of 6.59(-1.19,+1.61)x10^-6 erg/cm2 and a 2.944-s peak flux, measured from ~T0-14.4 s, of 1.54(-0.43,+0.50)x10^-7 erg/cm2/s (both in the 20 - 1500 keV energy range).
Modeling the K-W 3-channel time-integrated spectrum (from ~T0-26.2 s to ~T0+73.9 s) by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.82(-0.21,+0.33) and Ep = 263(-65,+112) keV.
All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.

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Jochen Greiner, last update: 17-May-2022 [Disclaimer]