GRB160726A

This page lists all entries on GRB160726A in GRBweb

Summary Fermi GBM IPN Swift GCN 19731 GCN 19732 GCN 19733 GCN 19734 GCN 19751 GCN 19777

Summary table
Variable Value Source
GRB_name_Fermi GRB160726065
T0 1:34:05.315 UTC GCN_circulars,Konus-Wind Det
ra 98.8090° Swift
decl -6.6170° Swift
pos_error 1.01e-02° Swift
T90 0.768 s Fermi_GBM
T90_error 0.345 s Fermi_GBM
T90_start 1:34:07.654 UTC Fermi_GBM
fluence 1.01e-06 erg/cm² Fermi_GBM
fluence_error 1.64e-08 erg/cm² Fermi_GBM
T100 3.107 s
GBM_located False
mjd 57595.06533929398 GCN_circulars,Konus-Wind Det
Fermi GBM table
GRB_name_Fermi GRB160726065
trigger_name bn160726065
ra 98.8208°
decl -6.6439°
pos_error 6.34e+00°
datum 2016-07-26
t_trigger 1:34:07.718 UTC
T90 0.768 s
T90_error 0.345 s
T90_start 1:34:07.654 UTC
fluence 1.01e-06 erg/cm²
fluence_error 1.64e-08 erg/cm²
flux_1024 5.54e+00 erg/cm²/s
flux_1024_error 2.40e-01 erg/cm²/s
flux_1024_time -6.40e-02 erg/cm²/s
flux_64 2.33e+01 erg/cm²/s
flux_64_error 1.43e+00 erg/cm²/s
IPN table
GRB_name GRB160726A
ra 98.8208°
decl -6.5500°
pos_error 5.00e-02°
Swift table
GRB_name GRB160726A
t_trigger 1:34:07 UTC
ra 98.8090°
decl -6.6170°
pos_error 1.01e-02°
T90 0.7 s
fluence 2.60e-07 erg/cm²
GCN 19731 table
GRB_name GRB160726A
GCN_number 19731
Detection_method Swift Det
t_trigger 1:34:07 UTC
ra 98.8210°
decl -6.6440°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19731 SUBJECT: GRB 160726A: Swift detection of a short burst DATE: 16/07/26 01:50:31 GMT FROM: Kim Page at U.of Leicester R. L. C. Starling (U Leicester), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester) and T. Sakamoto (AGU) report on behalf of the Swift Team: At 01:34:07 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160726A (trigger=706052). Swift did not slew immediately due to an observational constraint. The BAT on-board calculated location is RA, Dec 98.821, -6.644 which is RA(J2000) = 06h 35m 17s Dec(J2000) = -06d 38' 39" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 1 sec. The peak count rate was ~14000 counts/sec (15-350 keV), at ~0.7 sec after the trigger. Due to a Sun observing constraint, Swift cannot slew to the BAT position until 12:53 UT on 2016 August 10. There will thus be no XRT or UVOT data for this trigger before this time. Burst Advocate for this burst is R. L. C. Starling (rlcs1 AT star.le.ac.uk). 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 19732 table
GRB_name GRB160726A
GCN_number 19732
Detection_method Fermi GBM Det
t_trigger 1:34:07.720 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 19732 SUBJECT: GRB 160726A: Fermi GBM observation DATE: 16/07/26 08:28:00 GMT FROM: Elisabetta Bissaldi at U.Innsbruk/IAPP R. Hamburg (UAH), E. Burns (UAH), and E. Bissaldi (Politecnico & INFN Bari) report on behalf of the Fermi GBM Team: "At 01:34:07.72 UT on 26 July 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 160726A (trigger 491189651 / 160726065), which was also detected by the Swift/BAT (Starling et al. 2016, GCN 19731). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi-LAT boresight at the GBM trigger time is 50 degrees. The GBM light curve consists of two short peaks with a duration (T90) of about 0.7 s (50-300 keV). The time-averaged spectrum from T0-0.06 s to T0+0.77 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.0 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 540 +/- 100 keV. The event fluence (10-1000 keV) in this time interval is (1.01 +/- 0.05)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.06 s in the 10-1000 keV band is 5.5 +/- 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 19733 table
GRB_name GRB160726A
GCN_number 19733
Detection_method Konus-Wind Det
t_trigger 1:34:05.315 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 19733 SUBJECT: Konus-Wind observation of short GRB 160726A DATE: 16/07/26 14:14:21 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report: The short GRB 160726A (Swift/BAT detection: Starling et al., GCN 19731; Fermi GBM observation: Hamburg et al., GCN 19732) triggered Konus-Wind at T0=5645.315 s UT (01:34:05.315). The light curve shows a short pulse with a total duration is ~0.2 s. The emission is seen up to ~2 MeV. As observed by Konus-Wind, the burst had a fluence of (1.5 ± 0.5)x10^-6 erg/cm2 and a 16-ms peak energy flux, measured from T0+0.016, of (1.1 ± 0.3)x10^-5 erg/cm2 (both in the 20 keV - 10 MeV energy range). The spectrum of the burst (measured from T0 to T0+0.128 s) is best fit in the 20 keV - 2 MeV range by a cutoff power-law (CPL) function with the following model parameters: the photon index alpha = -0.65(-0.47,+0.71), and the peak energy Ep = 424(-163,+389) keV, chi2 = 19.5/20 dof. Fitting this spectrum with the GRB (Band) function yields the same alpha and Ep with only an upper limit on beta of -1.8, chi2 = 19.5/19 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB160726_T05645/ All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.
GCN 19734 table
GRB_name GRB160726A
GCN_number 19734
Detection_method Swift-BAT Det
ra 98.8090°
decl -6.6170°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19734 SUBJECT: GRB 160726A, Swift-BAT refined analysis DATE: 16/07/27 01:18:02 GMT FROM: Amy Lien at GSFC S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), R. L. C. Starling (U Leicester), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160726A (trigger #706052) (Starling et al., GCN Circ. 19731). The BAT ground-calculated position is RA, Dec = 98.809, -6.617 deg which is RA(J2000) = 06h 35m 14.2s Dec(J2000) = -06d 37' 03.0" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 58%. The mask-weighted light curve shows a double-peaked structure that starts at ~T0 and ends at ~T+0.8 s, with the two peaks at ~ T0 and ~T+0.6 s, respectively. T90 (15-350 keV) is 0.7 +- 0.04 sec (estimated error including systematics). The time-averaged spectrum from T+0.0 to T+0.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.26 +- 0.13. The fluence in the 15-150 keV band is 2.6 +- 0.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.11 sec in the 15-150 keV band is 3.2 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. Using a 4-ms binned light curve, the lag analysis finds a lag of is -3.5 +/- 3 ms for the 100-350 keV to 25-50 keV, and -5 +/- 6 ms for the 50-100 keV to 15-25 keV band. These numbers are consistent with those of a short GRB. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/706052/BA/
GCN 19751 table
GRB_name GRB160726A
GCN_number 19751
Detection_method CALET
Circular_text TITLE: GCN CIRCULAR NUMBER: 19751 SUBJECT: GRB 160726A: CALET Gamma-Ray Burst Monitor detection DATE: 16/08/01 21:03:22 GMT FROM: Takanori Sakamoto at AGU Y. Shimizu (Kanagawa U), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena) and the CALET collaboration: The short-duration GRB 160726A (Starling, et al., GCN circ. 19731; Hamburg, et al., GCN circ. 19732; Frederiks, et al. GCN circ. 19733) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 01:34:08.25 on 26 July 2016. The burst signal was seen by all CGBM instruments. The light curve of the SGM shows two peaks. The first weak episode peaks at T-0.55 s. The second peak starts at T-0.1 s, peaks at T+0.1 s and ends at T+0.3 s. The T90 duration measured by the SGM data is 0.83 +- 0.09 sec (40-1000 keV). The light curve is available at http://cgbm.calet.jp/cgbm_trigger/flight/1153531947/ The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN 19777 table
GRB_name GRB160726A
GCN_number 19777
Detection_method Konus-Wind Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 19777 SUBJECT: IceCube-160731A: Konus-Wind limits DATE: 16/08/05 15:52:16 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report: Using Konus-Wind (KW) data, we have performed a search for a gamma-ray transient around the time of the cosmic neutrino candidate IceCube- 160731A (http://gcn.gsfc.nasa.gov/notices_amon/6888376_128290.amon) No triggered KW event happened from ~5 days before to ~1 day after the IceCube event. The nearest KW triggers are GRB 160726A (Frederiks et al, GCN 19733) and GRB 160802A (Kozlova et al, GCN 19767) Using Konus-Wind waiting mode data in the interval ±1000 s around the IceCube trigger (July 31, 2016, 1:55:04 UTC), we estimate an upper limit (90% conf.) on the 20 – 1200 keV fluence to ~7.7x10^-7 erg/cm^2 for a burst with duration less than 2.944 s and with a typical KW short GRB spectrum (an exponentially cut off power law with alpha =-0.5 and Ep=500 keV, Svinkin et al. 2016). For a typical long GRB spectrum (the Band function with alpha=-1, beta=-2.5, and Ep=250 keV), the corresponding limiting peak flux is ~5.8x10^-7 erg/cm^2/s (20 – 1200 keV, 2.944 s scale). A plot of the KW waiting mode data can be found at http://www.ioffe.ru/LEA/IceCube/kw20160731_06904_bg.png All the quoted values are preliminary.