GRB150724B

This page lists all entries on GRB150724B in GRBweb

Summary Fermi GBM IPN Fermi LAT GCN 18065 GCN 18066 GCN 18068 GCN 18069 GCN 18072 GCN 18074 GCN 18075 GCN 18077 GCN 18078 GCN 18099 GCN 18101

Summary table
Variable Value Source
GRB_name_Fermi GRB150724782
T0 18:45:36.710 UTC Fermi_LAT
ra 351.8905° Fermi_LAT
decl 3.8181° Fermi_LAT
pos_error 6.83e-02° Fermi_LAT
T90 37.889 s Fermi_GBM
T90_error 0.572 s Fermi_GBM
T90_start 18:45:42.834 UTC Fermi_GBM
fluence 2.80e-05 erg/cm² Fermi_GBM
fluence_error 4.33e-08 erg/cm² Fermi_GBM
T100 44.013 s
GBM_located False
mjd 57227.78167488426 Fermi_LAT
Fermi GBM table
GRB_name_Fermi GRB150724782
trigger_name bn150724782
ra 351.9200°
decl 3.6700°
pos_error 2.95e+00°
datum 2015-07-24
t_trigger 18:45:37.714 UTC
T90 37.889 s
T90_error 0.572 s
T90_start 18:45:42.834 UTC
fluence 2.80e-05 erg/cm²
fluence_error 4.33e-08 erg/cm²
flux_1024 8.53e+00 erg/cm²/s
flux_1024_error 2.20e-01 erg/cm²/s
flux_1024_time 4.04e+01 erg/cm²/s
flux_64 1.10e+01 erg/cm²/s
flux_64_error 9.44e-01 erg/cm²/s
IPN table
GRB_name GRB150724B
ra 351.9208°
decl 3.6667°
pos_error 3.00e-01°
Fermi LAT table
GRB_name_Fermi GRB150724782
GRB_name GRB150724B
MET 459456340.71
datum 2015-07-24
t_trigger 18:45:36.710 UTC
ra 351.8905°
decl 3.8181°
pos_error 6.83e-02°
GCN 18065 table
GRB_name GRB150724B
GCN_number 18065
Detection_method Fermi LAT Det
t_trigger 18:45:36.710 UTC
ra 351.9200°
decl 3.6700°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18065 SUBJECT: GRB 150724B: Fermi-LAT detection DATE: 15/07/25 13:52:53 GMT FROM: Judith Racusin at GSFC E. Bissaldi (INFN Bari), J. L. Racusin (NASA/GSFC), and E. Moretti (MPP Munich) report on behalf of the Fermi-LAT team: At 18:45:36.71 on 2015-07-24, Fermi-LAT detected high-energy emission from GRB 150724B, which was also detected by Fermi-GBM (trigger 459456340/150724782). The best LAT on-ground location is found to be RA, Dec = 351.92, 3.67 (J2000) with an error radius of 0.3 deg (90% containment, systematic error only). This was 58 deg from the LAT boresight at the time of the trigger. The data from the Fermi-LAT show a ~5 sigma increase in the event rate within 7 degrees of the GBM location after the GBM trigger that is spatially and temporally correlated with the GBM emission. More than 11 photons above 100 MeV and 1 photons above 1 GeV were observed within 300 seconds. The highest-energy photon is a 2 GeV event which is observed ~50 seconds after the GBM trigger. A Swift ToO has been requested for this burst. The Fermi-LAT point of contact for this burst is Elisabetta Bissaldi (elisabetta.bissaldi@ba.infn.it). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN 18066 table
GRB_name GRB150724B
GCN_number 18066
Detection_method Fermi GBM Det
t_trigger 18:45:37.714 UTC
ra 350.9200°
decl 10.1600°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18066 SUBJECT: GRB 150724B: Fermi GBM detection DATE: 15/07/25 16:22:15 GMT FROM: Peter Veres at ELTE,Budapest P. Veres (UAH), V. Connaughton (USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 18:45:37.714 UT on 24 July 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150724B (trigger 459456341 / 150724782) which was also detected by the Fermi/LAT (Bissaldi et al. 2008, GCN 18065). The GBM on-ground location is consistent with the Fermi/LAT position. The on-ground calculated location, using the GBM trigger data, is RA = 350.92, DEC = +10.160 (J2000 degrees, equivalent to 23h 24m, 10d 10'), with an uncertainty of 1.05 degrees (radius, 1-sigma containment, statistical only). The GBM light curve consists of two emission episodes with a total duration (T90) of about 38 s (50-300 keV). The time-averaged spectrum from T0-6.1 s to T0+46 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.75 +/- 0.02 and the cutoff energy, parameterized as Epeak, is 729 +/- 35 keV. The event fluence (10-1000 keV) in this time interval is (3.55 +/- 0.04)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+40 s in the 8-1000 keV band is 8.3 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 18068 table
GRB_name GRB150724B
GCN_number 18068
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 18068 SUBJECT: GRB 150724B: Swift ToO observations DATE: 15/07/25 19:24:14 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Fermi/LAT GRB 150724B. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020543 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/LAT event. 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 18069 table
GRB_name GRB150724B
GCN_number 18069
Detection_method Swift-XRT Other
ra 351.8904°
decl 3.8186°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18069 SUBJECT: GRB 150724B: Swift-XRT observations DATE: 15/07/26 05:24:25 GMT FROM: Kim Page at U.of Leicester J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), C. Pagani (U. Leicester), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), L.M. McCauley (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 150724B (Bissaldi et al. GCN Circ. 18065), collecting 1.8 ks of Photon Counting (PC) mode data between T0+94.4 ks and T0+96.2 ks. One uncatalogued X-ray source has been detected, it is below the RASS limit and shows no definitive signs of fading. Therefore, at the present time we cannot confirm this as the afterglow. Details of this source are given below: Source 1: RA (J2000): 351.8904 = 23:27:33.70 Dec (J2000): +3.8186 = +03:49:06.8 Error: 4.3 arcsec (radius, 90% conf.) Count-rate: 0.0143 +/- 0.0033 ct s^-1 Flux: (4.6 +/- 1.1)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00020543. This circular is an official product of the Swift-XRT team.
GCN 18072 table
GRB_name GRB150724B
GCN_number 18072
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 18072 SUBJECT: GRB 150724B: RATIR Optical Observations DATE: 15/07/27 03:33:50 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of the LAT GRB 150724B (Bissaldi et al., GCN 18065) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2015/07 26.28 to 2015/07 26.48 UTC (36.02 to 40.86 hours after the BAT trigger), obtaining a total of 2.39 hours exposure in the r and i bands. For a source within the Swift XRT error circle (Osborne et al., GCN 18069), in comparison with the SDSS DR9 catalog, we obtain the following detections: r 23.24 +/- 0.34 i 22.39 +/- 0.15 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. At this moment we have no information on fading. Further observations are planned. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.
GCN 18074 table
GRB_name GRB150724B
GCN_number 18074
Detection_method Konus-Wind Det
t_trigger 18:46:14.792 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 18074 SUBJECT: Konus-Wind observation of GRB 150724B DATE: 15/07/27 14:09:55 GMT FROM: Anastasia Tsvetkova at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report: The long-duration, hard-spectrum GRB 150724B (Fermi-LAT detection: Bissaldi, Racusin & Moretti, GCN 18065; Fermi GBM detection: Veres, Connaughton & Meegan, GCN 18066) triggered Konus-Wind at T0=67574.792 s UT (18:46:14.792). The burst light curve shows a double-peaked structure which starts ~30 s before the trigger and has a total duration of ~41 s. The emission is seen up to ~5 MeV. As observed by Konus-Wind, the burst had a fluence of 3.63(-0.29,+0.69)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+2.064 s, of 6.01(-1.60,+1.62)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Only the brightest part of the burst is covered by the KW triggered mode data and, therefore, available for the multi-channel spectral analysis. The time-averaged spectrum measured from T0 to T0+8.448 s is best fit in the 20 keV - 5 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.65(-0.11,+0.12), and Ep = 663(-69,+82) keV (chi2 = 77/73 dof). Fitting by the GRB (Band) function yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -3.0 (chi2 = 77/72 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150724_T67574/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN 18075 table
GRB_name GRB150724B
GCN_number 18075
Detection_method Swift-UVOT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 18075 SUBJECT: GRB 150724B: Swift/UVOT Detection DATE: 15/07/27 17:25:04 GMT FROM: Paul Kuin at MSSL N.P.M. Kuin(MSSL/UCL) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 150724B 88.6ks after the LAT trigger (Bissaldi et al., GCN Circ. 18065), which was also observed at high energy by Fermi-GBM (Veres et al., GCN Circ 18066) and Konus-Wind (Golenetskii et al. GCN Circ. 18074). Five UVOT exposures were obtained of which the first two show a weak detection at the XRT position (Osborne et al., GCN Circ. 18069). Preliminary magnitudes and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) are: Filter T_start(s) T_stop(s) Exp(s) Mag white 88619 88799 178 19.64+-0.12 white 88802 90608 1765 20.99+-0.14 white 90614 90748 60 >19.53 white 94379 94558 176 >20.82 white 94562 96236 1648 >22.01 The brightness is consistent with the RATIR observation at 147ks in r and i (Butler et al, GCN 18072). The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.06 in the direction of the burst (Schlegel et al. 1998).
GCN 18077 table
GRB_name GRB150724B
GCN_number 18077
Detection_method Fermi LAT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 18077 SUBJECT: GRB 150724B: MASTER upper limit DATE: 15/07/27 20:06:01 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs K.Ivanov, O.Gres, N.M.Budnev, S.Yazev, Irkutsk State University V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa,A.Kuznetsov,D.Kuvshinov, Lomonosov Moscow State University, Sternberg Astronomical Institute R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk V.Krushinski, I.Zalozhnih Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB150724B (Bissaldi et al. GCN 18065) 9244 sec after notice time and 78080 sec after trigger time at 2015-07-25 16:26:57 UT. We do not see any OT brighter than 20.3 inside Fermi LAT error box and at Swift XRT transient position (Osborne et al., GCN 18069). All magnitudes are unfiltered (0.2B+0.8R) with respect to number USNO B stars). The message may be cited.
GCN 18078 table
GRB_name GRB150724B
GCN_number 18078
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 18078 SUBJECT: GRB 150724B: Continued RATIR Optical Observations DATE: 15/07/27 21:00:53 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We reobserved the field of the LAT GRB 150724B (Bissaldi et al., GCN 18065) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2015/07 27.24 to 2015/07 27.47 UTC (8819.11 to 8824.45 hours after the Fermi trigger), obtaining a total of 4.01 hours exposure in the r and i bands. We detect the source we previously reported (Butler et al. GCN 18072) at 23:27:33.82 +3:49:06.8 (J2000, 0.5"). In comparison with the SDSS DR9, we obtain the following detections: r 23.50 0.19 i 23.99 0.27 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. A naive comparison to our observations from the previous night would suggest that the source has not faded in r but has faded in i. However, examining the images in detail, we suspect that our photometry in i from the first night might be influenced by a spuriously bright pixel. We therefore discount the apparent fading in i. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir. [GCN OPS NOTE(27jul15): Per author's request, "140724A" was changed to "150724B" in the Subject-line.]
GCN 18099 table
GRB_name GRB150724B
GCN_number 18099
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 18099 SUBJECT: GRB150724B: Retraction of the uvot detection DATE: 15/07/31 21:00:42 GMT FROM: Paul Kuin at MSSL Paul Kuin (MSSL/UCL) reports on behalf of the Swift/UVOT team: In GCN Circ.18075 we reported a detection in the first two white band images with the Swift UVOT. Further examination of the UVOT data showed that in the initial analysis the background region included part off the detector and gave a false reading. Correcting for that it is found that for the first two images there is just an upper limit of white > 22.00 mag at 88.7ks after the trigger. We apologise for the confusion this error may have caused.
GCN 18101 table
GRB_name GRB150724B
GCN_number 18101
Detection_method Swift-XRT Other
ra 351.8905°
decl 3.8181°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18101 SUBJECT: GRB 150724B: Swift-XRT afterglow detection DATE: 15/08/01 05:05:00 GMT FROM: Kim Page at U.of Leicester J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), C. Pagani (U. Leicester), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), L.M. McCauley (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has conducted further observations of the field of the Fermi/LAT-detected burst GRB 150724B (Bissaldi et al. GCN Circ. 18065). The observations now extend from T0+88.6 ks to T0+607.8 ks. The source previously reported by Osborne et al. (GCN Circ. 18069), "Source 1", is fading with 3-sigma significance, and is therefore likely the GRB afterglow. The position of this source is RA, Dec=351.8905, +3.8181 which is equivalent to: RA (J2000): 23:27:33.71 Dec(J2000): +03:49:05.2 with an uncertainty of 4.1 arcsec (radius, 90% confidence). This position is 9.1 arcmin from the Fermi/LAT position. The source is fading with alpha >0.3. The results of the XRT-team automatic analysis of the likely afterglow are at http://www.swift.ac.uk/ToO_GRBs/00020543/index_1.php. The results of the full analysis of the XRT observations are available at http://www.swift.ac.uk/ToO_GRBs/00020543. This circular is an official product of the Swift-XRT team.