GRB090726A

This page lists all entries on GRB090726A in GRBweb

Summary IPN Swift GCN 9706 GCN 9707 GCN 9708 GCN 9709 GCN 9710 GCN 9711 GCN 9712 GCN 9714 GCN 9715 GCN 9716 GCN 9717 GCN 9732 GCN 9741 GCN 9926 GCN 10028

Summary table
Variable Value Source
T0 22:42:27 UTC GCN_circulars,Swift Det
ra 248.6804° Swift
decl 72.8842° Swift
pos_error 1.94e-04° Swift
T90 67.0 s Swift
T90_start 22:42:27 UTC Swift
fluence 8.60e-07 erg/cm² Swift
redshift 2.7100 GCN_circulars,Swift-UVOT Det
T100 67.0 s
GBM_located False
mjd 55038.94614583333 GCN_circulars,Swift Det
IPN table
GRB_name GRB090726A
ra 248.8167°
decl 72.8667°
pos_error 5.00e-02°
redshift 2.7100
Swift table
GRB_name GRB090726A
t_trigger 22:42:27 UTC
ra 248.6804°
decl 72.8842°
pos_error 1.94e-04°
T90 67.0 s
fluence 8.60e-07 erg/cm²
redshift 2.7100
GCN 9706 table
GRB_name GRB090726A
GCN_number 9706
Detection_method Swift Det
t_trigger 22:42:27 UTC
ra 248.8190°
decl 72.8710°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9706 SUBJECT: GRB 090726: Swift detection of a burst DATE: 09/07/26 22:56:51 GMT FROM: David Palmer at LANL K. L. Page (U Leicester), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), D. M. Palmer (LANL), A. Rowlinson (U Leicester), M. H. Siegel (PSU), M. A. Stark (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 22:42:27 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090726 (trigger=358422). Swift did not slew immediately to the burst due to an Earth constraint. The BAT on-board calculated location is RA, Dec 248.819, +72.871 which is RA(J2000) = 16h 35m 16s Dec(J2000) = +72d 52' 15" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a small precursor at T-20 followed by a single FRED structure overlaid with rapid variability with a duration of about 50 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~10 sec after the trigger. Swift will not slew until T0+48.9 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is K. L. Page (kpa 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 9707 table
GRB_name GRB090726A
GCN_number 9707
Detection_method Swift-XRT Other
ra 248.6788°
decl 72.8843°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9707 SUBJECT: GRB 090726: Swift-XRT position of probable counterpart DATE: 09/07/27 00:18:24 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: Following a delay caused by an Earth-limb constraint, the Swift-XRT started observing GRB 090726 about 49 minutes after the trigger, at 23:36:32 UT. The XRT initially centroided on a cosmic ray; however, using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec = 248.6788, 72.8843 (degrees) which is equivalent to: RA (J2000) = 16 34 42.90 DEC (J2000) = +72 53 03.3 with an uncertainty of 2.2 arcsec (radius, 90% containment). This location is 156.1 arcseconds from the BAT onboard position, inside the BAT error circle. It is not possible to determine whether the source is fading at this time. This circular is an official product of the Swift-XRT team.
GCN 9708 table
GRB_name GRB090726A
GCN_number 9708
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9708 SUBJECT: GRB 090726: Swift/UVOT Finding Chart Observation DATE: 09/07/27 01:06:32 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU), M. A. Stark (PSU) and K.L. Page (U. Leicester) report on behalf of the Swift UVOT team: UVOT observed GRB 090726 (Page et al., GCN Circ 9706) with a finding chart exposure of 150 seconds with the White filter starting 3610 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle reported by Page et al. (GCN Cic 9707). 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 0.04.
GCN 9709 table
GRB_name GRB090726A
GCN_number 9709
Detection_method Optical
ra 248.6793°
decl 72.8847°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9709 SUBJECT: GRB 090726: optical transient candidate DATE: 09/07/27 03:50:30 GMT FROM: Vladimir Sokolov at SAO RAS A. Moskvitin, T. Fatkhullin & A. Valeev (SAO-RAS Niznijh Arkhyz, Russia), on behalf of a larger colaboration, report: We have observed the field of GRB090618 (Page et al., GCN 9706) with the 1-m telesecope of the SAO RAS in Caucasus. Within the XRT error circle (Page et al., GCN 9707) we detected one object which not present in the DSS. The object's coordinates are: R.A. (J2000) = 16:34:43.044 DEC. (J2000) = +72:53:04.82 with uncertainty about 0.5 arcsec. Using the USNO A2.0 star 1628-0121951 (R2=14.51) as a calibration we estimated the object's brightness as following: R_mag exp.(sec) mid.time (sec after the trigger) 18.26 +/- 0.05 60 2126 18.39 +/- 0.05 60 2252 18.33 +/- 0.05 60 2344 18.71 +/- 0.05 120 3183 18.97 +/- 0.05 180 4296 19.17 +/- 0.06 180 5492 19.28 +/- 0.07 240 6089 19.55 +/- 0.12 300 6824 According to its variability we concluded that the detected object is the OT of the GRB090726. Further analysis are ongoing. This message may be cited.
GCN 9710 table
GRB_name GRB090726A
GCN_number 9710
Detection_method Swift-XRT Det
ra 248.6798°
decl 72.8843°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9710 SUBJECT: GRB 090726: Enhanced Swift-XRT position DATE: 09/07/27 11:53:24 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 4286 s of XRT Photon Counting mode data and 7 UVOT images for GRB 090726, 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 = 248.67985, +72.88426 which is equivalent to: RA (J2000): 16h 34m 43.16s Dec (J2000): +72d 53' 03.4" with an uncertainty of 1.5 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, arXiv:0812.3662). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 9711 table
GRB_name GRB090726A
GCN_number 9711
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9711 SUBJECT: GRB 090726: Swift-XRT Team refined analysis DATE: 09/07/27 13:30:11 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: We have analysed the first five orbits of data collected for GRB 090726, comprising 9.4 ks between 3.6 and 28 ks after the trigger, all in Photon Counting mode. The enhanced XRT position for this burst was given by Evans et al. in GCN Circ. 9710. The X-ray light-curve can be modelled with a single power-law with a decay index of alpha = 1.29 +/- 0.12. A spectrum formed from these PC data can be fitted with an absorbed power-law of Gamma = 2.50 +0.26/-0.24 and a total absorbing column of NH = (1.2 +/- 0.5) x 10^21 cm^-2, which is in excess of the Galactic value (3.83 x 10^20 cm^-2; Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (5.1 x 10^-11) erg cm^-2 count^-1. If the light-curve continues to decay with alpha ~ 1.29, the predicted count rate at 24 hours is 3.4 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) flux of 1.1 x 10^-13 (1.7 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00358422. This circular is an official product of the Swift-XRT team.
GCN 9712 table
GRB_name GRB090726A
GCN_number 9712
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9712 SUBJECT: GRB090726: 6-meter telescope redshift DATE: 09/07/27 14:06:50 GMT FROM: Vladimir Sokolov at SAO RAS T. Fatkhullin (SAO RAS, Russia), J. Gorosabel (IAA-CSIC, Spain), A. de Ugarte Postigo (OAB-INAF, Italy), A. Moskvitin, A. Valeev, S. Fabrika, O. Sholukhova (SAO RAS, Russia), A. Castro-Tirado (IAA-CSIC, Spain) & V. Sokolov (SAO RAS, Russia) on behalf of a larger colaboration, report: Following the detection of the GRB090726 optical transient (Moskvitin et al., GCN 9709) we observed the afterglow with the SAO RAS 6-m telescope in Caucasus using SCORPIO in the spectroscopic mode. The wavelength coverage and resolution were 3700-7800AA and FWHM=10A, respectively. One 10-min long exposure was obtained starting at 00:15 27 July 2009 UT (T-T0 = 1.545 hours after the trigger). A number of absoption lines were detected in the spectrum. These are SiI 1526.7, CIV 1548.2,1550.8, AlII 1670.8, SiII 1304.4,1309.3, SiIV 1393.7,1402.7, FeII 1608.4 as well as Ly alpha at common z = 2.71 which we interpret as the GRB090726 redshift. This message may be cited. P.S. We made a typo in GCN 9709. In the first line one should read "GRB090726" instead of "GRB090618". We apologize for our carelessness.
GCN 9714 table
GRB_name GRB090726A
GCN_number 9714
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9714 SUBJECT: GRB 090726: D50 optical observations DATE: 09/07/27 14:27:51 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Cyril Polasek (1), Jan Strobl (1), Martin Jelinek (2), Petr Kubanek (3), Matus Kocka (1), Martin Nekola (1), Martin Blazek (1) and Rene Hudec (1) (1. ASU Ondrejov, 2. IAA Granada, 3. GACE Valencia) We observed the localization of the Swift GRB090726 (Page et al., GCN 9706) with the 50 cm telescope in Ondrejov (Czech Republic), starting at 22:45:41 UT, i.e. 194s after the GRB trigger. We clearly detect the afterglow reported by Moskvitin et al. (GCN 9709) in its rising phase on the first image with magnitude ~ 18.3 (same calibration as GCN 9709). This message can be cited.
GCN 9715 table
GRB_name GRB090726A
GCN_number 9715
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9715 SUBJECT: GRB 090726: Afterglow candidate photometryfrom Crni Vrh DATE: 09/07/27 15:43:32 GMT FROM: Jure Skvarc at OCV S. Maticic and J. Skvarc on behalf of PIKA observing program at Crni Vrh Observatory. We present photometry of the source reported by Moskvitin, Fatkhullin and Valeev (GCN 9709). The object was observed from Crni Vrh Observatory with a 60 cm telescope using R filter and a CCD. First exposure started at 2009-07-26 22:44:31 UT. All twenty exposures were of 60 s. The table contains the time since the Swift GRB detection to the middle of exposure in seconds, R magnitude and formal 1-sigma magnitude error estimate. Comparison stars were 1629-0117020, 1628-0121875 and 1628-0121948 using R2 magnitudes from the USNO B1.0 catalogue. Time Mag Err. [s] [R] [1-sigma] ---------------------------------- 153.8 18.44 0.04 224.9 18.35 0.04 296.0 17.86 0.04 367.2 17.69 0.04 438.0 17.68 0.04 508.8 17.75 0.04 579.6 17.82 0.04 650.3 17.76 0.04 721.0 17.76 0.04 791.8 17.83 0.04 862.5 17.71 0.04 933.3 17.83 0.04 1004.0 17.89 0.04 1074.7 18.05 0.04 1146.1 18.17 0.04 1218.2 18.11 0.04 1288.9 18.00 0.04 1359.6 18.02 0.04 1430.5 18.16 0.04 1501.5 17.96 0.04 This message can be cited.
GCN 9716 table
GRB_name GRB090726A
GCN_number 9716
Detection_method Swift-BAT Det
ra 248.6810°
decl 72.8660°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9716 SUBJECT: GRB 090726, Swift-BAT refined analysis DATE: 09/07/27 15:57:17 GMT FROM: Tilan Ukwatta at GSFC/GWU H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (GSFC/UMD), K. L. Page (U Leicester), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (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 090726 (trigger #358422) (Page, et al., GCN Circ. 9706). The BAT ground-calculated position is RA, Dec = 248.681, 72.866 deg which is RA(J2000) = 16h 34m 43.5s Dec(J2000) = +72d 51' 56.5" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 85%. The mask-weighted light curve shows a weak single peak starting at ~T-40 sec, peaking at ~T+5 aec, and ending at ~T+70 sec. T90 (15-350 keV) is 67.0 +/- 15.2 sec (estimated error including systematics). The time-averaged spectrum from T-34.7 to T+47.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.25 +/- 0.19. The fluence in the 15-150 keV band is 8.6 +/- 1.0 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+7.30 sec in the 15-150 keV band is 0.7 +- 0.2 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/358422/BA/
GCN 9717 table
GRB_name GRB090726A
GCN_number 9717
Detection_method Swift-UVOT Det
redshift 2.7100
Circular_text TITLE: GCN CIRCULAR NUMBER: 9717 SUBJECT: GRB090726: Swift/UVOT observations DATE: 09/07/27 16:01:04 GMT FROM: Wayne Landsman at GSFC/SSAI W.B. Landsman (NASA/GSFC) and K.Page (U. Leicester)report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 090726, 3610s after the BAT trigger (Page et al., GCN Circ. 9706), and the afterglow first reported by Moskvitin et al., (GCN Circ. 9709) is detected in the UVOT white, v, and b filters. The initial magnitudes and upper limits are as follows: Filter T_start(s) Exp(s) Mag white 3610 147 20.62 0.18 white 4179 197 21.36 0.29 v 4589 197 19.98 0.36 b 3974 197 20.80 0.44 u 3769 197 >20.9 (3 sigma) uvw1 5000 197 >20.6 (3 sigma) uvm2 4794 197 >20.6 (3 sigma) uvw2 4385 197 >21.0 (3 sigma) The nondetections in the u and UV filters are consistent with the redshift of z= 2.71 reported by Fatkhullin et al (GCN 9712) The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.045 in the direction of the burst. The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN 9732 table
GRB_name GRB090726A
GCN_number 9732
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9732 SUBJECT: GRB 090726: GRT Optical Observation DATE: 09/07/29 10:22:47 GMT FROM: Takanori Sakamoto at NASA/GSFC T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC), T. Okajima (JHU/GSFC), T.N. Ukwatta (GWU/GSFC), Y. Urata (NCU), C.A. Wallace (FGCU) We observed the field of GRB 090726 detected by Swift (trigger #358422; Page et al., GCN Circ. 9706) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/). 89 set of 30 sec exposures were taken in the R filter starting from July 27 02:31:44 (UT) about 3.75 hours after the trigger and stopped on July 27 03:22:10 (UT). We do not detect the optical afterglow (Moskvitin et al., GCN Circ. 9709; Fatkhullin et al., GCN Circ. 9712; Polasek et al., GCN Circ. 9714; Maticic et al., GCN Circ. 9715; Landsman et al., GCN Circ. 9717) both in the individual images and the combined image. The estimated three sigma upper limit of the combined image (total exposure of 2670.0 sec) is ~18.9 mag using the USNO-B1 catalog.
GCN 9741 table
GRB_name GRB090726A
GCN_number 9741
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9741 SUBJECT: GRB 090726: optical observation DATE: 09/07/31 20:36:03 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (SAI MSU), E. Pavlenko, A. Sklyanov, O. Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 090726 (Page et al., GCN 9706) in R-filter on Jul. 27 between (UT) 18:19:22 - 20:28:58 with Shajn telescope of CrAO. We detect afterglow (Moskvitin et al., GCN 9709) in a stacked image. The photometry against nearby USNO-B1.0 stars is following: T0+ Filter, Exposure, mag., err. (d) (s) 0.8626 R 114x60 23.60 +/- 0.25 While the index of power law approximation of the light curve during early observation (Moskvitin et al., GCN 9709) is ~ -1.0, the power law index between observation presented by Moskvitin et al. (GCN 9709) and our observation is -1.6, clearly suggesting a break between 0.079 and 0.863 days.
GCN 9926 table
GRB_name GRB090726A
GCN_number 9926
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 9926 SUBJECT: GRB 090726: Skynet/GORT Observations DATE: 09/09/19 20:44:14 GMT FROM: Josh Haislip at U.North Carolina J. Haislip, D. Reichart, L. Cominsky, K. McLin, T. Graves, G. Spear, K. Ivarsen, A. LaCluyze, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report: Skynet observed the Skynet/BAT localization of GRB 090726 (Page et al., GCN 9706) with the 14" GORT telescope at Hume Observatory in California beginning 5.9 hours after the the trigger in I. We do not detect the afterglow (Page et al., GCN 9707; Moskvitin, Fatkhullin & Valeev, GCN 9709). Stacking only images that increase the limiting magnitude yields: mean 1-sig. 1-sig. time 3-sig. sys. stat. since lim. cal. cal. cal. trig. tel. exp. fil. mag. stars unc. unc. (h) (# x s) (mag) (mag) 6.2 GORT 15 x 80 I 19.8 84 USNO B1 0.213 0.002 6.8 GORT 8 x 80 R 20.2 178 USNO B1 0.235 0.001
GCN 10028 table
GRB_name GRB090726A
GCN_number 10028
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 10028 SUBJECT: GRB 090726 R band observations DATE: 09/10/16 21:08:29 GMT FROM: Janos Kelemen at Konkoly Obs/Hungary J. Kelemen (kelemen at konkoly.hu) on behalf of the GRB OT observing program at the Konkoly Observatory. We present photometry of the source reported by Moskvitin, Fatkhullin and Valeev (GCN 9709) which was found on a previous survey images made for asteroid astrometry. The object was observed from the Mountain Station of the Konkoly Observatory with a 60/90 cm Schmidt telescope using R filter and a CCD. The exposures were of 300 s. The table contains the time since the Swift GRB detection to the middle of exposure in seconds, R magnitude and formal 1-sigma magnitude error estimate. Comparison stars were from the USNO A2.0 catalogue. Aperture photometry results obtained using the ASTROMETRICA astrometry and photometry package. Time Mag Error. Flag. [s] [R] [1-sigma] ------------------------------------- 2010 18.21 0.05 2730 18.32 0.05 4530 18.82 0.05 78330 20.60 0.2 Upper Limit ------------------------------------- This message can be cited.