GRB210602A

This page lists all entries on GRB210602A in GRBweb

Summary IPN GCN 30113 GCN 30117 GCN 30145

Summary table
Variable Value Source
T0 12:03:59.748 UTC GCN_circulars,Konus-Wind Det
ra 44.6292° IPN
decl -2.6667° IPN
pos_error 2.00e-01° IPN
GBM_located False
mjd 59367.50277486111 GCN_circulars,Konus-Wind Det
IPN table
GRB_name GRB210602A
ra 44.6292°
decl -2.6667°
pos_error 2.00e-01°
GCN 30113 table
GRB_name GRB210602A
GCN_number 30113
Detection_method MAXI Det
t_trigger 12:04:02 UTC
ra 44.6300°
decl -2.6720°
Circular_text TITLE: GCN CIRCULAR NUMBER: 30113 SUBJECT: GRB 210602A: MAXI/GSC detection DATE: 21/06/02 12:44:38 GMT FROM: Motoko Serino at Aoyama Gakuin U. M. Serino, S. Sugita (AGU), H. Negoro, M. Nakajima, K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, 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, Y. Goto, R. Uematsu (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 a bright uncatalogued X-ray transient source at 12:04:02 UT on 2021 June 2. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (44.630 deg, -2.672 deg) = (02 58 31, -02 40 19) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.17 deg and 0.16 deg, respectively. The roll angle of long axis from the north direction is 107.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 393 +- 52 mCrab (4.0-10.0keV, 1 sigma error). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners: (R.A., Dec) = (43.754, -3.549) deg = (02 55 00, -03 32 56) (J2000) (R.A., Dec) = (44.013, -3.735) deg = (02 56 03, -03 44 05) (J2000) (R.A., Dec) = (45.446, -1.751) deg = (03 01 47, -01 45 03) (J2000) (R.A., Dec) = (45.187, -1.565) deg = (03 00 44, -01 33 53) (J2000) There was no significant excess flux in the previous transit at 10:31 UT with an upper limit of 20 mCrab.
GCN 30117 table
GRB_name GRB210602A
GCN_number 30117
Detection_method CALET
Circular_text TITLE: GCN CIRCULAR NUMBER: 30117 SUBJECT: GRB 210602A: CALET Gamma-Ray Burst Monitor detection DATE: 21/06/03 07:04:45 GMT FROM: Valentin Pal'shin at AGU V. Pal'shin, A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The bright GRB 210602A (MAXI/GSC detection: Serino et al., GCN Circ. 30113) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 12:04:01.493 UTC on 2 June 2021 (http://cgbm.calet.jp/cgbm_trigger/flight/1306670489/index.html). The burst signal was seen by all CGBM detectors. The burst light curve shows a single pulse which starts at T+0.5 sec, peaks at T+1.4 sec, and ends at T+3.0 sec. The T90 and T50 durations measured by the SGM data are 1.9 +- 0.3 sec and 0.5 +- 0.1 sec (40-1000 keV), respectively. The ground processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1306670489/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN 30145 table
GRB_name GRB210602A
GCN_number 30145
Detection_method Konus-Wind Det
t_trigger 12:03:59.748 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 30145 SUBJECT: Konus-Wind detection of GRB 210602A DATE: 21/06/07 15:08:45 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, S. Golenetskii, A.Lysenko, D. Svinkin, A. Ridnaya, A. Tsvetkova, M. Ulanov, and T. Cline, report: The bright GRB 210602A (MAXI/GSC detection: Serino et al., GCN 30113; CALET Gamma-Ray Burst Monitor detection: Pal'shin et al., GCN 30117) triggered Konus-Wind (KW) at T0=43439.748 s UT (12:03:59.748). The burst light curve shows a single pulse which starts at ~T0-0.5 s, peaks at ~T0+0.512 s, and has the total duration of ~3.1 s (T100, 20-1500 keV). The emission is seen up to ~2 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB210602_T43439/ As observed by Konus-Wind, the burst had a fluence of (6.3 ± 0.6)x10^-6 erg/cm^2 and a 64-ms peak energy flux, measured from T0+0.384, of (9.5 ± 1.0)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 15 MeV range by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.25(-0.23,+0.26) and Ep = 188(-33,+58) keV (chi2 = 75/97 dof). Fitting this spectrum by a Band function yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.2 (chi2 = 75/96 dof). All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.