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This page lists all entries on GRB250207B in GRBweb

Summary IPN GCN 39190 GCN 39207 GCN 39232

Summary table
Variable	Value	Source
T0	2:23:36 UTC	GCN_circulars,MAXI Det
ra	54.3583°	IPN
decl	5.3167°	IPN
pos_error	2.83e-01°	IPN
GBM_located	False
mjd	60713.09972222222	GCN_circulars,MAXI Det

IPN table
GRB_name	GRB250207B
ra	54.3583°
decl	5.3167°
pos_error	2.83e-01°

GCN 39190 table
GRB_name	GRB250207B
GCN_number	39190
Detection_method	MAXI Det
t_trigger	2:23:36 UTC
ra	54.3620°
decl	5.3250°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39190 SUBJECT: GRB 250207B: MAXI/GSC detection DATE: 25/02/07 04:26:02 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University K. Tatano, M. Nakajima, H. Negoro (Nihon U.), M. Serino, Y. Kawakubo (AGU), Y. Kudo, H. Shibui, K. Takagi, H. Takahashi, H. Nishio (Nihon U.), T. Mihara, S. Yamada, S. Wang, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Hiramatsu, H. Nishikawa, Y. Kondo, S. Sasao, A. Yoshida (AGU), Y. Tsuboi, H. Sugai, N. Nagashima (Chuo U.), M. Shidatsu, Y. Niida (Ehime U.), I. Takahashi, M. Niwano, N. Higuchi, Y. Yatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, M. Kurihara (JAXA), Y. Ueda, Y. Okada, K. Fujiwara (Kyoto U.), M. Yamauchi, Y. Otsuki, T. Hasegawa, M. Nishio (Miyazaki U.), K. Yamaoka (Nagoya U.),　 M. Sugizaki (Kanazawa U.),　W. Iwakiri (Chiba U.), T. Kawamuro (Osaka U.), report on behalf of the MAXI team: The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 02:23:36 UT on February 07, 2025. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (54.362 deg, 5.325 deg) = (03 37 26, +05 19 30) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.27 deg and 0.24 deg, respectively. The roll angle of long axis from the north direction is 124.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 218 +- 41 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) = (53.893, 6.160) deg = (03 35 34, +06 09 36) (J2000) (R.A., Dec) = (53.522, 5.823) deg = (03 34 05, +05 49 22) (J2000) (R.A., Dec) = (54.372, 4.895) deg = (03 37 29, +04 53 41) (J2000) (R.A., Dec) = (54.743, 5.230) deg = (03 38 58, +05 13 48) (J2000) There was no significant excess flux in the previous transit at 00:50 UT and in the next transit at 03:56 UT with an upper limit of 20 mCrab for each.

GCN 39207 table
GRB_name	GRB250207B
GCN_number	39207
Detection_method	Swift Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39207 SUBJECT: GRB 250207B: Tiled Swift observations DATE: 25/02/07 16:37:22 GMT FROM: Phil Evans at U of Leicester 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 250207B. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00131 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 39232 table
GRB_name	GRB250207B
GCN_number	39232
Detection_method	Swift-XRT Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 39232 SUBJECT: GRB 250207B: Swift-XRT observations DATE: 25/02/08 13:22:06 GMT FROM: Phil Evans at U of Leicester A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), J.A. Kennea (PSU), D.N. Burrows (PSU), M. A. Williams (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the MAXI-detected burst GRB 250207B in a series of observations tiled on the sky. The total exposure time is 1.5 ks, distributed over 6 tiles; the maximum exposure at a single sky location in the tiling was 540 s. The data were collected between T0+51.2 ks and T0+53.6 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 ~0.0e+00 to ~5.5e-01 ct s^-1, corresponding to a 0.3-10 keV observed flux of 0.0e+00 to 2.2e-11 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_GRB00131. This circular is an official product of the Swift-XRT team.