GRB140817A

This page lists all entries on GRB140817A in GRBweb

Summary Fermi GBM IPN Swift GCN 16695 GCN 16696 GCN 16697 GCN 16698 GCN 16699 GCN 16700 GCN 16701 GCN 16704 GCN 16710 GCN 16729 GCN 16731

Summary table
Variable Value Source
GRB_name_Fermi GRB140817293
T0 7:01:48.974 UTC Fermi_GBM
ra 127.2634° Swift
decl 58.1902° Swift
pos_error 6.86e-05° Swift
T90 16.128 s Fermi_GBM
T90_error 4.382 s Fermi_GBM
T90_start 7:01:48.974 UTC Fermi_GBM
fluence 5.03e-06 erg/cm² Fermi_GBM
fluence_error 4.11e-08 erg/cm² Fermi_GBM
T100 256.026 s
GBM_located False
mjd 56886.292927939816 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB140817293
trigger_name bn140817293
ra 127.2650°
decl 58.1900°
pos_error 3.09e+00°
datum 2014-08-17
t_trigger 7:01:58.190 UTC
T90 16.128 s
T90_error 4.382 s
T90_start 7:01:48.974 UTC
fluence 5.03e-06 erg/cm²
fluence_error 4.11e-08 erg/cm²
flux_1024 1.06e+01 erg/cm²/s
flux_1024_error 5.09e-01 erg/cm²/s
flux_1024_time 5.82e+00 erg/cm²/s
flux_64 1.65e+01 erg/cm²/s
flux_64_error 2.35e+00 erg/cm²/s
IPN table
GRB_name GRB140817A
ra 127.2542°
decl 58.1833°
pos_error 5.00e-02°
Swift table
GRB_name GRB140817A
t_trigger 7:02:01 UTC
ra 127.2634°
decl 58.1902°
pos_error 6.86e-05°
T90 244.0 s
fluence 4.60e-06 erg/cm²
GCN 16695 table
GRB_name GRB140817A
GCN_number 16695
Detection_method Swift Det
t_trigger 7:02:01 UTC
ra 127.2560°
decl 58.1890°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16695 SUBJECT: GRB 140817A: Swift detection of a burst DATE: 14/08/17 07:24:58 GMT FROM: David Palmer at LANL B. Sbarufatti (INAF-OAB/PSU), J. R. Cummings (NASA/UMBC), C. Gronwall (PSU) and D. M. Palmer (LANL) report on behalf of the Swift Team: At 07:02:01 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140817A (trigger=609736). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 127.256, +58.189 which is RA(J2000) = 08h 29m 01s Dec(J2000) = +58d 11' 21" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiply-peaked structure with a duration of about 30 sec. The peak count rate was ~16000 counts/sec (15-350 keV), at ~3 sec after the trigger. The XRT began observing the field at 07:03:36.4 UT, 95.2 seconds after the BAT trigger. No source was detected in the 2.5-s promptly available image. We are waiting for the full dataset to detect and localise the XRT counterpart. UVOT took a finding chart exposure of 150 seconds with the White filter starting 100 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 5% of the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.15. Burst Advocate for this burst is B. Sbarufatti (boris.sbarufatti AT brera.inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN 16696 table
GRB_name GRB140817A
GCN_number 16696
Detection_method Swift-XRT Other
ra 127.2646°
decl 58.1901°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16696 SUBJECT: GRB 140817A: Swift-XRT position DATE: 14/08/17 08:22:47 GMT FROM: Boris Sbarufatti at INAF-OAB/IASFPA B. Sbarufatti (INAF-OAB/PSU) reports on behalf of the Swift-XRT team Using promptly downlinked data we find a bright, fading X-ray source with an enhanced position: RA,Dec = 127.2646, 58.1901 (degrees) which is equivalent to: RA (J2000) = 08 29 03.51 DEC (J2000) = +58 11 24.4 with an uncertainty of 2.2 arcsec (radius, 90% containment). This location is 16.8 arcseconds from the BAT onboard position, inside the BAT error circle.
GCN 16697 table
GRB_name GRB140817A
GCN_number 16697
Detection_method Swift-XRT Det
ra 127.2639°
decl 58.1900°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16697 SUBJECT: GRB 140817A: Enhanced Swift-XRT position DATE: 14/08/17 10:09:35 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 448 s of XRT Photon Counting mode data and 1 UVOT images for GRB 140817A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 127.26394, +58.19002 which is equivalent to: RA (J2000): 08h 29m 3.35s Dec (J2000): +58d 11' 24.1" with an uncertainty of 1.8 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 16698 table
GRB_name GRB140817A
GCN_number 16698
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16698 SUBJECT: GRB 140817A draft circular on nearby galaxy DATE: 14/08/17 16:46:49 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift GRB 140817A Close to nearby galaxy J. R. Cummings, K. L. Page (U Leicester) on behalf of the Swift science team: We note the presence of a low-redshift galaxy in DSS, SDSS, 2MASS (SIMBAD) whose center is 98 arcseconds from the center of the Swift-XRT refined position error circle (Osborne, GCN Circ. # 16697), MCG+10-12-141 at z ~ 0.018368. The angular size of the galaxy is about 0.8 arcmin.
GCN 16699 table
GRB_name GRB140817A
GCN_number 16699
Detection_method Swift-BAT Det
ra 127.2440°
decl 58.1910°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16699 SUBJECT: GRB 140817A: Swift-BAT refined analysis DATE: 14/08/17 17:16:02 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings, S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140817A (trigger #609736) (Sbarufatti, et al., GCN Circ. 16695). The BAT ground-calculated position is RA, Dec = 127.244, 58.191 deg which is RA(J2000) = 08h 28m 58.5s Dec(J2000) = +58d 11' 27.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%. The mask-weighted light curve shows multiple sharp peaks from T-20 to T+12 seconds, then a return to background levels until about T+170 seconds where 2 overlapping FRED peaks begin, lasting until about T+250 seconds. T90 (15-350 keV) is 244 +- 13 sec (estimated error including systematics). The time-averaged spectrum from T-21.26 to T+270.27 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.48 +- 0.08. The fluence in the 15-150 keV band is 4.6 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+2.64 sec in the 15-150 keV band is 7.2 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/609736/BA/
GCN 16700 table
GRB_name GRB140817A
GCN_number 16700
Detection_method Fermi GBM Det
t_trigger 7:01:58.190 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 16700 SUBJECT: GRB 140817A: Fermi GBM Detection DATE: 14/08/17 18:48:16 GMT FROM: Oliver Roberts at UCD/Fermi Oliver Roberts (UCD) and Charles Meegan (UAH) report on behalf of the Fermi GBM Team: "At 07:01:58.19 UT on the 17th of August 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140817A (trigger 429951721 / 140817293), which was also detected by the BAT and XRT on Swift (Sbarufatti et al., Evans et al. and Cummings et al. 2014, GCNs 16695-99). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 124 degrees. The GBM light curve consists of two bright peaks with a duration (T90) of about 16 s (50-300 keV). The time-averaged spectrum from T0-9 s to T0+16 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.64 +/- 0.19 and the cutoff energy, parameterised as Epeak, is 130 +/- 11 keV. The event fluence (10-1000 keV) in this time interval is (5.03 +/- 0.04)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+5.8 s in the 10-1000 keV band is 10.6 +/- 0.5 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 16701 table
GRB_name GRB140817A
GCN_number 16701
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 16701 SUBJECT: GRB 140817A: Swift-XRT refined Analysis DATE: 14/08/17 19:25:04 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), V. Mangano (PSU), J.P. Osborne (U. Leicester) and B. Sbarufatti report on behalf of the Swift-XRT team: We have analysed 8.9 ks of XRT data for GRB 140817A (Sbarufatti et al. GCN Circ. 16695), from 79 s to 29.9 ks after the BAT trigger. The data comprise 590 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 16697). The late-time light curve (from T0+4.7 ks) can be modelled with a power-law decay with a decay index of alpha=0.86 (+/-0.08). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.625 (+/-0.030). The best-fitting absorption column is 2.45 (+0.15, -0.14) x 10^21 cm^-2, in excess of the Galactic value of 8.0 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.79 (+0.11, -0.10) and a best-fitting absorption column of 2.3 (+/-0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x 10^-11 (5.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.3 (+/-0.4) x 10^21 cm^-2 Galactic foreground: 8.0 x 10^20 cm^-2 Excess significance: 6.1 sigma Photon index: 1.79 (+0.11, -0.10) If the light curve continues to decay with a power-law decay index of 0.86, the count rate at T+24 hours will be 0.033 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 x 10^-12 (1.7 x 10^-12) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00609736. This circular is an official product of the Swift-XRT team.
GCN 16704 table
GRB_name GRB140817A
GCN_number 16704
Detection_method Konus-Wind Det
t_trigger 7:01:59.509 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 16704 SUBJECT: Konus-Wind observation of GRB 140817A DATE: 14/08/18 13:51:37 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lyssenko, and T. Cline on behalf of the Konus-Wind team, report: A long-duration GRB 140817A (Swift-BAT trigger 609736: Sbarufatti et al., GCN 16695; Cummings et al., GCN 16699; Fermi-GBM detection: Roberts & Meegan, GCN 16700) triggered Konus-Wind at T0=25319.509 s UT (07:01:59.509). The light curve shows a double-peaked structure from ~T0-0.5 s to ~T0+3.5 s, the emission in this episode is visible up to ~8 MeV. The subsequent broad, weak, soft pulse is visible in the instrument's soft energy channel from ~T0+160 s to ~T0+270 s; it coincides in time with the bright X-ray flare in the XRT light curve (http://www.swift.ac.uk/xrt_products/00609736). As observed by Konus-Wind, the burst had a fluence of 3.4(-0.3,+0.3)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+2.816 s, of 3.0(-0.3,+0.3)x10^-6 erg/cm2/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 the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.22 (-0.37,+0.40), the high energy photon index beta = -2.8 (-7.2,+0.4), the peak energy Ep = 118 (-18,+29) keV, chi2 = 84/84 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140817_T25319/ All the quoted errors are at the 95% confidence level. All the quoted values are preliminary.
GCN 16710 table
GRB_name GRB140817A
GCN_number 16710
Detection_method Swift-UVOT Other
ra 127.2634°
decl 58.1902°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16710 SUBJECT: GRB 140817A: Swift/UVOT Afterglow Detection DATE: 14/08/18 21:40:21 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140817A 101 s after the BAT trigger (Sbarufatti et al., GCN Circ. 16695). A fading source consistent with the UVOT-enhanced XRT position (Osborne et al. GCN Circ. 16697) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 08:29:03.21 = 127.26336 (deg.) Dec (J2000) = 58:11:24.7 = 58.19020 (deg.) with an estimated uncertainty of 0.53 arc sec. (radius, 90% confidence). Preliminary detection and 3-sigma upper limits 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 101 1017 334 20.3 +/- 0.17 white 5426 18414 1794 >21.6 v 642 1068 58 >18.0 b 568 762 39 >18.5 u 313 4899 435 >20.5 w1 692 1117 39 >19.2 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.15 in the direction of the burst (Schlegel et al. 1998).
GCN 16729 table
GRB_name GRB140817A
GCN_number 16729
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16729 SUBJECT: GRB 140817A: Khureltogot optical upper limit DATE: 14/08/20 17:29:16 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Pozanenko (IKI), N. Tungalag (Research Center of Astronomy and Geophysics MAS), S. Schmalz (AIP), A. Volnova (IKI), I.Molotov (KIAM) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 140817A (Sbarufatti et al., GCN 16695) with ORI-40 telescope of Khureltogot observatory. We started observation on Aug. 17 (UT) 14:20:48 and obtained 60 unfiltered images of 60 s exposure. Within enhanced XRT error circle (Osborne et al., GCN 16697) we do not detect any new object and in particular the afterglow candidate (Marshall et al., GCN 16710). Details of a photometry of the stacked image is following Date UT start t-T0 Filter Exp. UL(3 sigma) (mid, days) (s) 2014-08-17 14:20:48 0.3269 None 60*60 18.2 The photometry is based on USNO-B1.0 star 1481-0233222 assuming R=15.43.
GCN 16731 table
GRB_name GRB140817A
GCN_number 16731
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 16731 SUBJECT: GRB 140817A: NOT optical observations DATE: 14/08/21 16:01:53 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Daniele Malesani (DARK/NBI), Jyri Lehtinen (Univ. Helsinki), and Pall Jakobsson (Univ. Iceland), report on behalf of a larger collaboration: We observed the field of GRB 140817A (Sbarufatti et al., GCN 16695) with the Nordic Optical Telescope (NOT) equipped with the AlFOSC camera. Observations were carried out starting on 2014 Aug 20.23 UT (2.94 days after the GRB), at high airmass and in twilight, for a total exposure of 15 min. No source is detected at the position of the UVOT optical afterglow (Marshall & Sbarufatti, GCN 16710) nor within the XRT error circle (Sbarufatti, GCN 16696; Osborne et al., GCN 16697) down to a 3-sigma limiting magnitude of R = 21 (calibrated against the USNO-B1.0 catalog). The galaxy MCG +10-12-141 at z ~ 0.018, around 1 arcmin away of the XRT position, is well detected in our images (Cummings & Page, GCN 16698). We note that a supernova similar to SN 1998bw would have R ~ 17.5 at z = 0.018 at a comparable epoch. We thus disfavor the association of GRB 140817A with the nearby galaxy.