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This page lists all entries on GRB140824B in GRBweb

Summary Fermi GBM GCN 16743 GCN 16746 GCN 16750

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB140824606
T0	14:33:12 UTC	GCN_circulars,IPN Triangulation
ra	355.3710°	GCN_circulars,IPN Triangulation
decl	-1.1470°	GCN_circulars,IPN Triangulation
T90	108.802 s	Fermi_GBM
T90_error	0.923 s	Fermi_GBM
T90_start	14:33:14.855 UTC	Fermi_GBM
fluence	1.26e-05 erg/cm²	Fermi_GBM
fluence_error	7.56e-08 erg/cm²	Fermi_GBM
T100	111.657 s
GBM_located	False
mjd	56893.60638888889	GCN_circulars,IPN Triangulation

Fermi GBM table
GRB_name_Fermi	GRB140824606
trigger_name	bn140824606
ra	18.3300°
decl	58.6400°
pos_error	4.35e+00°
datum	2014-08-24
t_trigger	14:33:12.039 UTC
T90	108.802 s
T90_error	0.923 s
T90_start	14:33:14.855 UTC
fluence	1.26e-05 erg/cm²
fluence_error	7.56e-08 erg/cm²
flux_1024	6.95e+00 erg/cm²/s
flux_1024_error	2.75e-01 erg/cm²/s
flux_1024_time	1.11e+02 erg/cm²/s
flux_64	1.24e+01 erg/cm²/s
flux_64_error	1.10e+00 erg/cm²/s

GCN 16743 table
GRB_name	GRB140824B
GCN_number	16743
Detection_method	Fermi GBM Det
t_trigger	14:33:12.040 UTC
Circular_text	TITLE: GCN CIRCULAR NUMBER: 16743 SUBJECT: GRB 140824B: Fermi GBM Detection DATE: 14/08/25 16:46:21 GMT FROM: Binbin Zhang at UAH Bin-Bin Zhang (UAH) reports on behalf of the Fermi GBM Team: "At 14:33:12.04 UT on the 24th of August 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140824B (trigger 430583595 / 140824606), which has been followed up by MASTER II robotic telescope (Tyurina et al. GCNs 16740, 16741). The GBM on-ground location is consistent with the Fermi flight software position. The angle from the Fermi LAT boresight is 79 degrees. The GBM light curve consists of three main peaks with a total duration (T90) of about 109 s (50-300 keV). The time-averaged spectrum from T0+3 s to T0+112 s is well fit by Band function parameterized as Ep=186+/-20 keV, alpha=-0.9+/-0.1 and beta=-2.5+/-0.5. The event fluence (10-1000 keV) in this time interval is (1.5+/-0.1)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+111 s in the 10-1000 keV band is 6.9+/-0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

GCN 16746 table
GRB_name	GRB140824B
GCN_number	16746
Detection_method	Swift Other
ra	17.7548°
decl	60.5607°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 16746 SUBJECT: GRB 140824B: Swift observations DATE: 14/08/26 14:33:02 GMT FROM: Claudio Pagani at U of Leicester C. Pagani (U. Leicester), N. P. M. Kuin (UCL-MSSL) and J. R. Cummings (GSFC/UMBC) report on behalf of the Swift team: We report on Swift follow-up observations of the Fermi/GBM GRB 140824B (Zhang, GCN Circ. 16743) centred at the position of the candidate optical counterpart reported by the MASTER II robotic telescope (Tyurina et al., GCNs 16740, 16741). In 4.9 ks of XRT Photon Counting (PC) mode data, from 90.6 ks to 103.4 ks after the Fermi/GBM trigger, no X-ray source is detected at the MASTER II position. The 3-sigma upper limit on the count rate is 1.8E-03 cts/s, which is 9.2E-14 erg cm^-2 s^-1 using a typical flux conversion of 5E-11 erg cm^-2 count^-1. The UVOT detected the reported candidate OT. The preliminary UVOT position is: RA (J2000) = 01:11:01.14 = 17.75473 (deg.) Dec (J2000) = +60:33:38.6 = 60.56071 (deg.) with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence). Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 91250 91850 590 17.97 0.05 white 96997 97610 603 17.94 0.05 white 102774 103372 590 18.09 0.05 v 91857 92457 590 17.47 0.07 v 97617 98230 603 17.61 0.07 u 90644 91244 590 17.65 0.06 u 96991 96991 603 17.62 0.06 u 102158 102768 600 17.91 0.07 The magnitudes in the table are not corrected for the large, but uncertain Galactic extinction due to the reddening of E(B-V) = 0.79 in the direction of the burst (Schlegel et al. 1998). The UVOT magnitudes when compared to the reported unfiltered magnitudes of 17.0 and 17.5 by MASTER, suggest a slowly varying source. Based on the Swift observations, the optical transient detected by MASTER II is therefore unlikely to be the GRB afterglow.

GCN 16750 table
GRB_name	GRB140824B
GCN_number	16750
Detection_method	IPN Triangulation
t_trigger	14:33:12 UTC
ra	355.3710°
decl	-1.1470°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 16750 SUBJECT: IPN Triangulation of GRB 140824B DATE: 14/08/27 16:09:57 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley on behalf of the IPN, V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, on behalf of the Fermi GBM team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The long-duration GRB 140824B (Zhang, GCN 16743) has been observed by Konus-Wind, Fermi(GBM trigger 430583595), and INTEGRAL (SPI-ACS), so far, at about 52392 s UT (14:33:12). We have triangulated it to a Konus-GBM annulus centered at RA(2000)=355.371 deg (23h 41m 29s) Dec(2000)=-1.147 deg (-1d 08' 51"), whose radius is 61.534 1.149 deg (3 sigma). The OT reported by MASTER (Tyurina et al., GCNs 16740, 16741) is well outside of the annulus (at 3.6 deg from the annulus center line). Therefore, we conclude that this OT is not related to the burst (as was already suggested by Tyurina et al. (GCN 16741) and Pagani et al. (GCN 16746) basing on the optical observations). A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB140824_T52472/IPN/