GRB090813A

This page lists all entries on GRB090813A in GRBweb

Summary Fermi GBM IPN Swift GCN 9781 GCN 9782 GCN 9783 GCN 9784 GCN 9785 GCN 9786 GCN 9787 GCN 9788 GCN 9790 GCN 9792 GCN 9798 GCN 9811 GCN 9817 GCN 9820

Summary table
Variable Value Source
GRB_name_Fermi GRB090813174
T0 4:10:41.925 UTC GCN_circulars,Konus-Wind Det
ra 225.7878° Swift
decl 88.5682° Swift
pos_error 1.81e-04° Swift
T90 7.552 s Fermi_GBM
T90_error 0.362 s Fermi_GBM
T90_start 4:10:42.977 UTC Fermi_GBM
fluence 3.33e-06 erg/cm² Fermi_GBM
fluence_error 4.15e-08 erg/cm² Fermi_GBM
T100 8.604 s
GBM_located False
mjd 55056.17409635417 GCN_circulars,Konus-Wind Det
Fermi GBM table
GRB_name_Fermi GRB090813174
trigger_name bn090813174
ra 225.8021°
decl 88.5686°
pos_error 3.19e+00°
datum 2009-08-13
t_trigger 4:10:42.593 UTC
T90 7.552 s
T90_error 0.362 s
T90_start 4:10:42.977 UTC
fluence 3.33e-06 erg/cm²
fluence_error 4.15e-08 erg/cm²
flux_1024 1.36e+01 erg/cm²/s
flux_1024_error 2.54e-01 erg/cm²/s
flux_1024_time 5.12e-01 erg/cm²/s
flux_64 2.41e+01 erg/cm²/s
flux_64_error 1.10e+00 erg/cm²/s
IPN table
GRB_name GRB090813A
ra 227.0167°
decl 88.5667°
pos_error 5.00e-02°
Swift table
GRB_name GRB090813A
t_trigger 4:10:43 UTC
ra 225.7878°
decl 88.5682°
pos_error 1.81e-04°
T90 7.1 s
fluence 1.30e-06 erg/cm²
GCN 9781 table
GRB_name GRB090813A
GCN_number 9781
Detection_method Swift Det
t_trigger 4:10:43 UTC
ra 227.0170°
decl 88.5730°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9781 SUBJECT: GRB 090813: Swift detection of a burst DATE: 09/08/13 04:26:12 GMT FROM: Scott Barthelmy at NASA/GSFC J. R. Cummings (NASA/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), C. Gronwall (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Stamatikos (OSU/NASA/GSFC) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 04:10:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090813 (trigger=359884). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 227.017, +88.573 which is RA(J2000) = 15h 08m 04s Dec(J2000) = +88d 34' 21" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two peaks with a duration of about 8 sec. The peak count rate was ~9000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 04:12:01.7 UT, 78.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 225.8016, +88.5687 which is equivalent to: RA(J2000) = 15h 03m 12.38s Dec(J2000) = +88d 34' 07.3" with an uncertainty of 6.1 arcseconds (radius, 90% containment). This location is 110 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. The initial flux in the 2.5 s image was 6.26e-10 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 87 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 100% of the XRT 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 XRT 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 0.17. Burst Advocate for this burst is J. R. Cummings (jayc AT milkyway.gsfc.nasa.gov). 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 9782 table
GRB_name GRB090813A
GCN_number 9782
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9782 SUBJECT: GRB 090813: optical candidate from 1.23m CAHA telescope DATE: 09/08/13 05:01:48 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel, V. Terron, M. Fernandez, P. Kubanek, M. Jelinek, A.J. Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration, report; We have carried out I-band observations of the XRT position of GRB 090813 (GCN 9781) with the 1.23m telescope of Calar Alto. The observations started at 04:18 UT (437 s after the GRB trigger). We detect an object with a rough magnitude of I~17 coincident with the XRT position no present on the DSS. We propose that object as the optical afterglow of GRB 090813.
GCN 9783 table
GRB_name GRB090813A
GCN_number 9783
Detection_method Other
ra 225.7853°
decl 88.5682°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9783 SUBJECT: GRB 090813: P60 Optical Afterglow Confirmation DATE: 09/08/13 05:25:55 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko (Caltech) reports on behalf of a larger collaboration: We have imaged the field of GRB090813 (Cummings et al., GCN 9781) with the automated Palomar 60 inch telescope. Observations were taken in the Sloan r', i', and z' filters beginning at approximately 4:12 UT (~ 2 minutes after the burst). Inside the XRT error circle we find a fading point source with coordinates (J2000): RA: 15:03:08.48 Dec: +88:34:05.5 with an estimated error of ~ 0.3" in each coordinate. Presumably this is the same source identified by Gorosabel et al. (GCN 9782). With reference to several USNO-B1 sources in the field, we measure the following I-band magnitudes for the afterglow: UT (mid-point) Exposure (s) Magnitude ---------------------------------------------------------------- 04:15:47 60 17.8 04:20:33 60 18.2 Further observations are planned.
GCN 9784 table
GRB_name GRB090813A
GCN_number 9784
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9784 SUBJECT: GRB 090813: Liverpool Telescope afterglow confirmation DATE: 09/08/13 06:17:10 GMT FROM: James Smith at ARI,Liverpool John Moors U R.J. Smith, I.A. Steele, Z. Cano (Liverpool JMU), C. Guidorzi (U. Ferrara), C.G. Mundell, A. Melandri, S. Kobayashi, C.J. Mottram, D.F. Bersier, (Liverpool JMU), A. Gomboc (U. Ljubljana), report on behalf of a large collaboration: On 2009 August 13 at 04:13:40.8 UT the 2-m Liverpool Telescope automatically began observing the Swift GRB 090813 (Cummings et al., GCN Circ. 9781) using the r' and i' filters. We confirm the detection by Gorosabel et al (GCN 9782) and Cenko et al (GCN 9783) of an optical counterpart to the XRT source. We measure a position of 15:03:05.9 88:34:05.5 J2000 with an uncertainty of 1arcsec and further, confirm the OT is fading. Ths position is 1 arcsec from and therefore conssitent from that reported by Cenko et al (GCN 9783). Mid Time Delay from BAT Total Exp Filter Mag (UT) trigger (min) (s) ---------------------------------------------------------- 04:13:45.8 3.05 10 R 19.36 +/- 0.13 04:18:11.9 7.48 120 R 19.90 +/- 0.05 04:20:58.2 10.25 120 I 18.11 +/- 0.02 ---------------------------------------------------------- Both astrometry and photometry is calibrated and quoted with respect to USNO-B. Further observations are ongoing.
GCN 9785 table
GRB_name GRB090813A
GCN_number 9785
Detection_method Swift-XRT Det
ra 225.7789°
decl 88.5679°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9785 SUBJECT: GRB 090813: Enhanced Swift-XRT position DATE: 09/08/13 11:51:40 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 615 s of XRT Photon Counting mode data and 1 UVOT images for GRB 090813, 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 = 225.77887, +88.56795 which is equivalent to: RA (J2000): 15h 03m 6.93s Dec (J2000): +88d 34' 04.6" with an uncertainty of 1.7 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 9786 table
GRB_name GRB090813A
GCN_number 9786
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9786 SUBJECT: GRB090813: Swift/UVOT upper limits DATE: 09/08/13 13:16:46 GMT FROM: Patricia Schady at MSSL/Swift P. Schady (MSSL-UCL) and J.R. Cummings (NASA/UMBC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 090813 88s after the BAT trigger (Cummings et al., GCN Circ 9781). No new source is detected within the XRT error circle or at the optical position reported by Cenko (GCN Circ. 9783) in any of the individual or combined UVOT filters. The 3-sigma upper limits of detected a source at the position of the optical afterglow reported by Cenko (GCN Circ. 9783) in the first white band finding chart (fc) observation, and in consecutive coadded observations for each of the UVOT filters are as follows: Filter T_start(s) T_stop(s) Exp(s) Mag 3-sig UL wh (fc) 88 237 147 > 20.55 wh 581 1894 264 > 21.35 vv 631 1943 156 > 19.39 bb 556 1869 136 > 20.29 uu 300 2017 382 > 20.44 w1 681 1992 156 > 19.73 m2 656 1967 156 > 19.41 w2 607 1919 156 > 19.83 The values quoted above are not corrected for the Galactic extinction due to the large reddening of E(B-V) = 0.17 in the direction of the burst (Schlegel et al., 1998). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN 9787 table
GRB_name GRB090813A
GCN_number 9787
Detection_method Konus-Wind Det
t_trigger 4:10:41.925 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 9787 SUBJECT: Konus-Wind observations of GRB090813 DATE: 09/08/13 13:30:59 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: GRB 090813 (Swift trigger=359884: Cummings et al., GCN 9781) triggered Konus-Wind at T0=15041.925 s UT (04:10:41.925) The burst started with a double-peaked structure with a duration of ~2 s. Another, softer peak, with a duration of ~1.5 s, was observed at T0 + 6s. The Konus-Wind light curves of this GRB are available at http://www.ioffe.ru/LEA/GRBs/GRB090813_T15041/ As observed by Konus-Wind the burst had a fluence of 2.4(-0.4,+0.5)x10-6 erg/cm2, and a 64-ms peak flux, measured from T0, of 3.3(-0.6,+0.7)x10-6 erg/cm2/s (both in the 20 keV - 1 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+8.448 s) is well fitted (in the 20 keV - 1 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.37(-0.28,+0.35), and Ep = 104(-23,+41)keV (chi2 = 58/61 dof). Fitting by GRB (Band) model yields to the same alpha and Ep values with the high energy photon index beta < -9. The spectrum at the maximum count rate, measured from T0 to T0+0.256 s, is well fitted (in the 20 keV - 1 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.85(-0.29,+0.34), and Ep = 195(-43,+71)keV (chi2 = 20/23 dof). All the quoted values are preliminary. All the quoted errors are at the 90% confidence level.
GCN 9788 table
GRB_name GRB090813A
GCN_number 9788
Detection_method Swift-BAT Det
ra 225.0650°
decl 88.5710°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9788 SUBJECT: GRB 090813, Swift-BAT refined analysis DATE: 09/08/13 13:55:52 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 090813 (trigger #359884) (GRB 090813, Cummings et al., GCN Circ. 9781). The BAT ground-calculated position is RA, Dec = 225.065, 88.571 deg which is RA(J2000) = 15h 00m 15.6s Dec(J2000) = +88d 34' 15.8" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 18%. The mask weighted lightcurve had three main spikes, at T+0, T+1 and T+6.5 sec, each with a duration of about 1 sec. T90 (15-350 keV) was 7.1 +- 0.6 sec (estimated error including systematics). The three spikes were progressively softer. The time-averaged spectrum from T-0.8 to T+7.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.69 +- 0.12. The fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.04 sec in the 15-150 keV band is 8.5 +- 0.6 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/359884/BA/
GCN 9790 table
GRB_name GRB090813A
GCN_number 9790
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9790 SUBJECT: GRB 090813: Swift-XRT refined analysis DATE: 09/08/13 15:43:56 GMT FROM: Andy Beardmore at U Leicester A. P. Beardmore (U. Leicester) and J. R. Cummings (NASA/UMBC) report on behalf of the Swift-XRT team: We have analysed 8.8 ks of XRT data for GRB 090813 (Cummings et al., GCN Circ. 9781), from 84 s to 19.3 ks after the BAT trigger. The data span four orbits, comprising 810 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 9785). The X-ray light curve initially follows a shallow decay, with a decay index of 0.22 +/ 0.10, before steepening to an index of 1.15 +/- 0.03 at about 450 s after the trigger. A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.10 +/- 0.07. The best-fitting absorption column is (2.23 +0.20 -0.19) x 10^21 cm^-2, in excess of the Galactic value of 6.3 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.00 +0.11 -0.10 and a best-fitting absorption column of (2.3 +/- 0.3) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.3 x 10^-11 (6.4 x 10^-11) erg cm^-2 count^-1. If the light curve continues to decay with a power-law decay index of 1.15, the estimated count rate at T+24 hours will be 0.016 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.9 x 10^-13 (1.0x 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/00359884. This circular is an official product of the Swift-XRT team.
GCN 9792 table
GRB_name GRB090813A
GCN_number 9792
Detection_method Fermi GBM Det
t_trigger 4:10:42.590 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 9792 SUBJECT: GRB 090813: Fermi GBM observation DATE: 09/08/13 16:48:15 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: "At 04:10:42.59 UT on 13 August 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090813 (trigger 271829444 / 090813174), which was also detected by the SWIFT-BAT (Cummings et al. 2009, GCN 9781) and Konus/Wind (Golenetskii et al., 2009, GCN Circular 9787). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 35.3 degrees. This burst was also independently detected by INTEGRAL SPI-ACS. The GBM light curve consists of two separate pulses with a duration (T90) of about 9 s (8-1000 keV). The time-averaged spectrum from T0-0.256 s to T0+8.960 s is well fit by a power law function with an exponential high energy cutoff. The power law index is -1.43 +/- 0.08 an the cutoff energy, parameterized as Epeak, is 161 +/- 26 keV (chi squared 495 for 480 d.o.f.). The event fluence (8-1000 keV) in this time interval is (3.5 +/- 0.2)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+0.512 s in the 8-1000 keV band is 14.4 +/- 0.5 ph/s/cm^2. A Band function fits the spectrum equally well (chi squared 492 for 479 d.o.f.) with Epeak= 95 +/- 30 keV, alpha = -1.25 +/- 0.18 and beta = -2.0 +/- 0.1. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 9798 table
GRB_name GRB090813A
GCN_number 9798
Detection_method correction
Circular_text TITLE: GCN CIRCULAR NUMBER: 9798 SUBJECT: GRB 090813: correction to GCN 9787 DATE: 09/08/14 10:57:53 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, on behalf of Konus-Wind team, report: The correct upper limit for the high energy spectral index (beta) for the GRB (Band) model fit to Konus-Wind time integrated spectrum of GRB 090813 is -2.23 (90% confidence level, 20-1000 keV range).
GCN 9811 table
GRB_name GRB090813A
GCN_number 9811
Detection_method Optical
ra 225.7000°
decl 88.5282°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9811 SUBJECT: GRB 090813: CrAO optical obsevations DATE: 09/08/15 09:29:00 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (SAI MSU), E. Pavlenko, O. Antoniuk, V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 090813 (Cummings et al. GCN 9781) starting (UT) Aug. 13 23:57:26 with Shajn telescope of CrAO under favorable weather condition and seeing ~1.6". At the place of optical afterglow (Gorosabel et al. GCN 9782; Cenko et al. GCN 9783; Smith et al. GCN 9784) we detect a source which appears slightly E-W extended. Preliminary photometry of the source in a combined image based on USNO-B1.0 star (RA(J2000)=15:02:47.99, Dec(J2000)=88:31:41.4) assuming R= 14.23 is following: T0+ Filter, Exposure, mag., err. (d) (s) 0.8440 R 57x60 20.50 +/-0.06 Observations will be continued.
GCN 9817 table
GRB_name GRB090813A
GCN_number 9817
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 9817 SUBJECT: GRB 090813: Suzaku WAM observation of the prompt emission DATE: 09/08/17 09:43:52 GMT FROM: Takeshi Uehara at Hiroshima U GRB 090813: Suzaku WAM observation of the prompt emission T. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.), Y. Terada, M. Tashiro, A. Endo, K. Onda, T. Sugasahara, W. Iwakiri (Saitama U.), S. Sugita, K. Yamaoka (Aoyama Gakuin U.), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji, E. Sonoda, K. Kono, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), N. Vasquez (Tokyo Tech.), Y. Urata (NCU), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report The long, GRB 090813 (Swift/BAT trigger #359884 ; Cummings et al., GCN 9781; Fermi GBM trigger #271829444 ) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 04:10:43.2 UT (=T0). The observed light curve shows a double-peaked structure lasting from T0-0.8s to T0+1.2s followed by a long weak tail seen up to T0+6.8s with a duration (T90) of about 7.6 seconds. The fluence in 100 - 1000 keV was 1.70 (-0.51, +0.61) 10^-6 erg/cm^2. The 1-s peak flux measured from T0-0.2s was 2.77 (-0.40, +0.35) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-0.8s to T0+6.8s is well fitted by a single power-law with a photon index of 1.80 (-0.30, +0.40) (chi^2/d.o.f = 7.6/8). All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN 9820 table
GRB_name GRB090813A
GCN_number 9820
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9820 SUBJECT: GRB 090813: I-band observations from 1.5m OSN telescope DATE: 09/08/17 15:09:25 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA-CSIC), A. de Ugarte Postigo (INAF-OAB), A. Sota (IAA- CSIC), S. Guziy (IAA-CSIC), M. Jelinek (IAA-CSIC), P. Kubanek (IAA- CSIC & IPL Univ. Valencia), A.J. Castro-Tirado (IAA-CSIC), report; We performed I-band observations of the GRB 090813 optical afterglow (Gorosabel et al. GCN 9782; Cenko et al. GCN 9783; Smith et al. GCN 9784) with the 1.5m telescope of Observatorio de Sierra Nevada. The observations were carried on Aug 13.8979 - 13.9667 UT with a total exposure time of 4950 seconds. No object brigther than I = 21.9 was detected at the afterglow position.