GRB090715B

This page lists all entries on GRB090715B in GRBweb

Summary IPN Swift GCN 9668 GCN 9670 GCN 9671 GCN 9672 GCN 9673 GCN 9674 GCN 9675 GCN 9676 GCN 9677 GCN 9678 GCN 9679 GCN 9681 GCN 9684 GCN 9687 GCN 9695 GCN 9720 GCN 9927

Summary table
Variable Value Source
T0 21:03:14 UTC GCN_circulars,Swift Det
ra 251.3399° Swift
decl 44.8389° Swift
pos_error 1.81e-04° Swift
T90 266.0 s Swift
T90_start 21:03:14 UTC Swift
fluence 5.70e-06 erg/cm² Swift
redshift 3.0000 GCN_circulars,Other
T100 266.0 s
GBM_located False
mjd 55027.87724537037 GCN_circulars,Swift Det
IPN table
GRB_name GRB090715B
ra 251.3458°
decl 44.8333°
pos_error 5.00e-02°
redshift 3.0000
Swift table
GRB_name GRB090715B
t_trigger 21:03:14 UTC
ra 251.3399°
decl 44.8389°
pos_error 1.81e-04°
T90 266.0 s
fluence 5.70e-06 erg/cm²
redshift 3.0000
GCN 9668 table
GRB_name GRB090715B
GCN_number 9668
Detection_method Swift Det
t_trigger 21:03:14 UTC
ra 251.3440°
decl 44.8270°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9668 SUBJECT: GRB 090715B: Swift detection of a burst with a possible optical counterpart DATE: 09/07/15 21:34:31 GMT FROM: Loredana Vetere at PSU L. Vetere (PSU), A. P. Beardmore (U Leicester), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), C. Pagani (PSU), J. L. Racusin (PSU), B. Sbarufatti (INAF-IASFPA), M. H. Siegel (PSU), M. Stamatikos (NASA/ORAU) and M. A. Stark (PSU) report on behalf of the Swift Team: At 21:03:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090715B (trigger=357512). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 251.344, +44.827 which is RA(J2000) = 16h 45m 23s Dec(J2000) = +44d 49' 36" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 100 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~6 sec after the trigger. The XRT began observing the field at 21:04:00.9 UT, 46.2 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 251.3405, +44.8377 which is equivalent to: RA(J2000) = 16h 45m 21.71s Dec(J2000) = +44d 50' 15.7" with an uncertainty of 4.9 arcseconds (radius, 90% containment). This location is 39 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. UVOT took a finding chart exposure of 150 seconds with the White filter starting 53 seconds after the BAT trigger. There is a weak source in 2.7'x2.7' sub-image near the edge of the XRT error circle at the position of RA(J2000) = 16:45:21.62 Dec(J2000) = +44:50:21.3 The estimated white magnitude 20.5 with an estimated error of 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01. Swift autonomous slewing to new GRBs was enabled just prior to this burst. It was disabled previously due to an anomaly with the on-board solid state recorder. That problem is now resolved. Burst Advocate for this burst is L. Vetere (vetere AT astro.psu.edu). 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 9670 table
GRB_name GRB090715B
GCN_number 9670
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9670 SUBJECT: GRB 090715B - Liverpool Telescope Optical Afterglow Candidate DATE: 09/07/16 00:25:24 GMT FROM: Carole Mundell at ARI, JMU,Liverpool R.J. Smith, C.G. Mundell, A. Melandri, I.A. Steele, S. Kobayashi, C.J. Mottram, D.F. Bersier, Z. Cano (Liverpool JMU), A. Gomboc (Ljubljana), C. Guidorzi (INAF-OAB) report: "The 2-m Liverpool Telescope robotically followed up GRB090715 (SWIFT trigger 357512; Vetere et al. GCN 9668) beginning 11.07 min after the GRB trigger time. An uncatalogued course is detected at: 16 45 21.67 +44 50 21 (J2000) (positional uncertainty +/-1") with magnitude r' = 19.6 +/- 0.2 mag (wrt SDSS) at T=11.53 min. Observations and analysis are ongoing. This message may be cited"
GCN 9671 table
GRB_name GRB090715B
GCN_number 9671
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9671 SUBJECT: GRB 090715B: NOT optical observations DATE: 09/07/16 01:42:48 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani (DARK/NBI), T. Augusteijn (NOT), C. Mackay, D. King, T. Staley (IoA Cambridge), A. De Cia and P. Jakobsson (Univ. Iceland) report on behalf of a larger collaboration: We observed the field of GRB 090715B (Vetere et al., GCN 9668) with the NOT equipped with StanCam, in the V, R, and I filters. In a single 180 s exposure starting on 2009 July 16.040 UT (3.91 hr after the GRB), we clearly detect the object reported by Vetere et al. (GCN 9668) and Smith et al. (GCN 9670) with a magnitude R = 19.92 +- 0.03 (assuming R = 17.16 for the USNO star at 16:45:24.24, +44:50:57.3). Although our measurement indicates only moderate fading when compared to the value by Smith et al. (GCN 9670), the object is missing from the SDSS frames of this field, and is thus very likely the afterglow of GRB 090715B.
GCN 9672 table
GRB_name GRB090715B
GCN_number 9672
Detection_method Swift-BAT Det
ra 251.3370°
decl 44.8370°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9672 SUBJECT: GRB 090715B: Swift-BAT refined analysis DATE: 09/07/16 03:12:09 GMT FROM: Scott Barthelmy at NASA/GSFC 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), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU), L. Vetere (PSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090715B (trigger #357512) (Vetere, et al., GCN Circ. 9668). The BAT ground-calculated position is RA, Dec = 251.337, 44.837 deg, which is RA(J2000) = 16h 45m 20.9s Dec(J2000) = +44d 50' 12.6" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a series of peaks. The first starts at ~T-10 sec, peaks at ~T+7 sec, and returns almost to background at T+35 sec. The second peak start at ~T+45 sec and ends at ~T+100 sec. The third peak starts at ~T+230 sec and ends at ~T+290 sec. T90 (15-350 keV) is 266 +- 11 sec (estimated error including systematics). The time-averaged spectrum from T-11.6 to T+292.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.57 +- 0.07. The fluence in the 15-150 keV band is 5.7 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+6.46 sec in the 15-150 keV band is 3.8 +- 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/357512/BA/
GCN 9673 table
GRB_name GRB090715B
GCN_number 9673
Detection_method Other
redshift 3.0000
Circular_text TITLE: GCN CIRCULAR NUMBER: 9673 SUBJECT: GRB090715B: WHT redshift DATE: 09/07/16 05:19:03 GMT FROM: Klaas Wiersema at U of Leicester K. Wiersema (Leicester), A. Levan (Warwick), A. Kamble (Amsterdam), N. Tanvir (Leicester) and D. Malesani (DARK/NBI) report on behalf of a larger collaboration: We observed the afterglow of GRB090715B (Vetere et al, GCN 9668; Smith et al GCN9 670) with the William Herschel Telescope, using the ISIS spectrograph. Exposure times were 3 x 900 seconds with the R300B and R316R grisms in the blue and red arm respectively, starting at 23:46 UT. We detect a multitude of lines, including Lyman alpha, Lyman beta, SiII and SII at redshift z=3.00. We thank T. Ottosen for acquiring this dataset.
GCN 9674 table
GRB_name GRB090715B
GCN_number 9674
Detection_method Swift Other
ra 251.3400°
decl 44.8380°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9674 SUBJECT: GRB 090715B: Swift XRT Refined Analysis DATE: 09/07/16 05:45:40 GMT FROM: Loredana Vetere at PSU L. Vetere (PSU) reports on behalf of the Swift-XRT team: We have analysed ~2 ks of XRT data for GRB 090715B (Vetere et al. GCN Circ. 9668), from 52 s to 10.2 ks after the BAT trigger. The data comprise 471 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The refined XRT position for this burst is Ra, Dec 251.340 44.838 which is: RA(J2000) = 16h 45m 21.7s Dec(J2000) = +44d 50' 18.1" The light curve shows multiple peaks in WT and a power-law decay in PC with a decay index of alpha=1.1(+/-0.2). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.84 (+/-0.02). The best-fitting absorption column is 1.09 (+/-0.02) x 10^21 cm^-2, in excess of the Galactic value of 1.3 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.3 (+/-0.3) and a best-fitting absorption column of 1.4 (+/-0.1) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (5.8 x 10^-11) erg cm^-2 count^-1. If the light curve continues to decay with a power-law decay index of 1.1, the count rate at T+24 hours will be 0.02 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.6 x 10^-13 (1.2 x 10^-12) erg cm^-2 s^-1. This circular is an official product of the Swift-XRT team.
GCN 9675 table
GRB_name GRB090715B
GCN_number 9675
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9675 SUBJECT: GRB 090715B: Observation of the optical afterglow DATE: 09/07/16 08:27:41 GMT FROM: Angelo Antonelli at Obs. Astro. di Roma L. A. Antonelli (INAF-OAR), S. Marinoni (INAF-TNG), F. Montalvo (UNAM- OAN), A. Vazquez (UNAM-IA) report: We observed the field of GRB 090715B (Vetere et al., GCN 9668) with the 1.5 m Telescope in San Pedro Martir (BCN-Mexico) equipped with LaRuca, in the B, V, and R filters. We started observations on 2009 July 16.1729 UT (7.07 hrs after the burst) and we detect the object reported by Malesani et al., (GCN 9671), Smith et al. (GCN 9670) and Vetere et al. (GCN 9668) in all filters. The object has a magnitude R = 20.4 +- 0.1 (calibrated against USNO B1). The object has faded with respect of the value reported by Malesani et al., (GCN 9671) with a decay index of 0.77 +-0.39. Due to its fading behavior we can confirm that it is the optical afterglow of GRB 090715B. This message can be cited.
GCN 9676 table
GRB_name GRB090715B
GCN_number 9676
Detection_method Swift-XRT Det
ra 251.3397°
decl 44.8389°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9676 SUBJECT: GRB 090715B: Enhanced Swift-XRT position DATE: 09/07/16 11:11:26 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 2329 s of XRT Photon Counting mode data and 5 UVOT images for GRB 090715B, 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 = 251.33969, +44.83889 which is equivalent to: RA (J2000): 16h 45m 21.53s Dec (J2000): +44d 50' 20.0" 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 9677 table
GRB_name GRB090715B
GCN_number 9677
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9677 SUBJECT: GRB 090715B: break in the optical afterglow decay DATE: 09/07/16 11:49:28 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), Z. Cano, A. Melandri, C.G. Mundell, R.J. Smith, I.A. Steele, D. Bersier, S. Kobayashi (Liverpool JMU), A. Gomboc (U. Ljubljana) on behalf of a large collaboration report: We began observing the Swift GRB 090715B (Vetere et al. GCN Circ. 9668) with the Liverpool Telescope (LT) on July 15, 21:14:19 UT (11.0 min post BAT trigger) with the SDSS riz filters, confirming the detection of the optical afterglow seen by Swift-UVOT (Smith et al. GCN Circ. 9670; Malesani et al GCN Circ. 9671; Antonelli et al. GCN Circ. 9675). Observations with the LT carried on until 5.6 hours post burst. Our measurements are in agreement with the value reported by Malesani et al. (GCN Circ. 9671) after correcting for the different calibration. We also observed the OT with the Faulkes Telescope North (FTN) from July 16, 09:45:46 UT (i.e., at 12.71 hours) with the R filter. The light curve in the r filter from 0.18 to 12.7 hours can be fitted with a broken power-law with alpha1=0.25 +/- 0.02, t_break =18 (-3, +12) ks, alpha2~0.7. Telescope Mid Time Exposure Filter Mag (hours) (s) ------------------------------------------------------ FTN 12.90 1200 R 20.98 +- 0.05 ------------------------------------------------------ Calibration was performed against the SDSS star mentioned by Malesani et al. (GCN 9671), assuming r'=17.74 and R=17.54.
GCN 9678 table
GRB_name GRB090715B
GCN_number 9678
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9678 SUBJECT: GRB 090715B: Swift/UVOT followup observations DATE: 09/07/16 12:32:09 GMT FROM: Alice Breeveld at MSSL-UCL A. Breeveld (MSSL/UCL) and L. Vetere (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 090715B 53 s after the BAT trigger (Vetere et al., GCN Circ. 9668). The optical afterglow reported in Vetere et al., GCN 9668 and confirmed by Smith et al., GCN 9670, Malesani et al., GCN 9671, Wiersema et al., GCN 9673 and Antonelli et al., GCN 9675 is detected by the UVOT only in the initial white exposure. The detected magnitude and preliminary 3-sigma upper limits obtained using a 3" aperture and the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent summed exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 53 203 147 20.37 +/- 0.15 white 4052 4252 196 >21.3 v 5989 22687 795 >21.0 b 3848 4047 197 >20.3 u 266 16495 428 >21.2 w1 12053 16278 894 >21.2 m2 6195 10367 826 >21.0 w2 4258 22065 995 >21.4 The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN 9679 table
GRB_name GRB090715B
GCN_number 9679
Detection_method Konus-Wind Det
t_trigger 21:03:19.008 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 9679 SUBJECT: Konus-Wind and Konus-RF observations of GRB 090715B DATE: 09/07/16 12:52:47 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, and D. Svinkin on behalf of the Konus-Wind and Konus-RF teams, and T. Cline on behalf of the Konus-Wind team, report: The long GRB 090715B (Vetere et al., GCN 9668) triggered Konus-Wind at T0=75799.008 s UT (21:03:19.008), and Konus-RF instrument onboard CORONAS-PHOTON s/c at T0(KRF)=75798.895 s UT (21:03:18.895). The burst had a multi-peaked structure with a duration of ~100 s. The Konus-Wind light curves of this GRB are available at http://www.ioffe.ru/LEA/GRBs/GRB090715_T75799/ As observed by Konus-Wind, the burst had a fluence of 9.3(-1.1,+1.5)x10-6 erg/cm2, and a 256-ms peak flux, measured from T0+4.912 s, of 9.0(-2.5,+2.5)x10-7 erg/cm2/s (both in the 20 keV - 2 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+82.176 s) is well fitted (in the 20 keV - 2 MeV range) by a power-law with exponential cutoff (CPL) model: dN/dE ~ E^{alpha}*exp(-(2+alpha)*E/Epeak), for which: the photon index alpha = -1.1(-0.34,+0.4), and the peak energy Ep = 134(-30,+56) keV (chi2 = 57/61 dof). The spectrum at the maximum count rate, measured from T0 to T0+8.448 s, is also well fitted (in the 20 keV - 2 MeV range) by CPL model, for which: the photon index alpha = -0.86(-0.20,+0.22), and the peak energy Ep = 178(-23,+33) keV (chi2 = 49/61 dof). All the quoted values are preliminary. The quoted errors are at the 90% confidence level.
GCN 9681 table
GRB_name GRB090715B
GCN_number 9681
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9681 SUBJECT: GRB 090715B: MASTER optical limit DATE: 09/07/16 13:32:17 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs D.Kuvshinov, V. Lipunov, V.Kornilov, E. Gorbovskoy, A.Belinski, A. Krylov, N.Shatskiy, N.Tyurina, P.Balanutsa, V.V.Chazov, P.V.Kortunov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parkhomenko, Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalognikh, T.Kopytova, Alexander Popov Ural State University, Kourovka S.Yazev, K.Ivanov Irkutsk State University MASTER robotic telescope (MASTER-Net: http://observ.pereplet.ru, 355 mm, 6 square degrees, 16Mpx Apogee CCD) located at Vostrykovo (Moscow) responded to the GRB 090715B (Swift trigger 357512, L. Vetere , GCN 9668), producing images beginning 19 s after the GCN notice time. An automated response took the first image at 21:11:18 UT, 8m 04s after the burst, under summer Moscow sky. We have 160 images with 30 sec exposition each. These unfiltered images are calibrated relative to USNO 08.R+0.2B (Usno A2.0). Individual images have limiting magnitudes ranging from 17.8-17.0; we set the following specific limits. GRB_time start UT end UT t_exp(s) mlim Coadd? ------------------------------------------------------------------- 484 - 514s 21:11:18 21:41:18 30 17.8 no 484 - 699s 21:11:18 21:14:57 90 18.5 3 484 - 6699S 21:11:18 22:54:27 3330 20.0 111 Robot do not detect OT with limit 20.0 . The message may be cited. mailto: lipunov@sai.msu.ru
GCN 9684 table
GRB_name GRB090715B
GCN_number 9684
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9684 SUBJECT: GRB 090715B: Lick observations DATE: 09/07/17 17:28:04 GMT FROM: Daniel Perley at U.C. Berkeley D. A. Perley, J. Choi, A. Morton and M. Ganeshalingam (UC Berkeley) report: We obtained a series of R-band exposures of the optical transient associated with GRB 090715B (GCN 9668, Vetere et al.; GCN 9670, Smith et al.) at the 1-meter Nickel telescope at Lick Observatory under clear skies and good seeing. The transient is detected in individual frames. We report the following magnitudes relative to the calibration star of Malesani et al. (GCN 9671): t_start(UT) exp(s) mag t-t0(hr) 06:17:06.10 120 R = 20.23 +/- 0.21 9.23 06:27:36.17 200 R = 20.27 +/- 0.16 9.41 06:31:53.21 200 R = 20.06 +/- 0.14 9.48 06:42:53.80 300 R = 20.48 +/- 0.17 9.66 06:54:57.78 300 R = 20.40 +/- 0.16 9.86 07:01:01.97 300 R = 20.39 +/- 0.20 9.96 07:07:07.30 300 R = 20.24 +/- 0.14 10.07 07:19:01.36 300 R = 20.47 +/- 0.18 10.26 07:32:15.82 300 R = 20.71 +/- 0.23 10.44 A stack of all images gives an average magnitude of R = 20.23 +/- 0.07.
GCN 9687 table
GRB_name GRB090715B
GCN_number 9687
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9687 SUBJECT: GRB 090715B: further NOT optical observations DATE: 09/07/18 15:31:46 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani (DARK/NBI), G. C. Cox (NOT), C. Mackay, D. King, T. Staley (IoA Cambridge), and P. Jakobsson (Univ. Iceland) report on behalf of a larger collaboration: We observed again the field of GRB 090715B (Vetere et al., GCN 9668) using the NOT telescope equipped with the StanCam instrument. The optical afterglow (Vetere et al., GCN 9668; Smith et al., GCN 9670) is well detected in the V and R filters, and is still bright. Using the same reference star as in GCN 9671, we measure R ~ 21.3 on mean time July 17.94 UT (2.06 days after the GRB). Assuming an unbroken power-law fading (Fnu propto t^-alpha), the corresponding decay index is alpha ~ 0.44, which is unusually flat at such late epoch (although not unprecedented). Our measurement is also consistent within the uncertainties with the broken power-law fit reported by Guidorzi et al. (GCN 9677). DM thanks Carole G. Mundell and Cristiano Guidorzi for discussion.
GCN 9695 table
GRB_name GRB090715B
GCN_number 9695
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 9695 SUBJECT: GRB 090715B: VLA radio detection DATE: 09/07/20 19:54:32 GMT FROM: Poonam Chandra at U Virginia/NRAO Poonam Chandra (RMC) and Dale A. Frail (NRAO) report on behalf of a larger collaboration: "We used the Very Large Array (VLA) to observe the field of view towards the GRB 090715B (GCN 9668) at a frequency of 8.46 GHz on 2009 Jul. 20.14 UT. We clearly detect the GRB afterglow at the Swift UVOT afterglow position (GCN 9668). The peak flux at the GRB afterglow position is 231+/-47 uJy. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN 9720 table
GRB_name GRB090715B
GCN_number 9720
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9720 SUBJECT: GRB 090715B: Late-time Lick 3m observations DATE: 09/07/28 06:13:01 GMT FROM: Daniel Perley at U.C. Berkeley D. A. Perley, N. R. Butler, and S. B. Cenko (UC Berkeley) report: We obtained additional, late-time imaging of the field of GRB 090715B (GCN 9668, Vetere et al.; GCN 9670, Smith et al.) with the Lick 3m telescope (+PFCam) in the R-band filter under dark skies, good seeing conditions and thin cloud cover. Observations were conducted on the night of 2009-07-24 (UT) between 04:46 and 06:15 UT, and consisted of seven 300-second exposures followed by four 600-second exposures. The afterglow is faintly detected in the combined image. Photometry relative to the reference star of Malesani et al. (GCN 9671) gives a magnitude of R = 23.6 +/- 0.3 mag at this time (t = 8.35 days after the GRB). Relative to the NOT observation at 2.06 days (Malesani et al., GCN 9687), this corresponds to a decay index of alpha ~ 1.5, indicating that the unusually long period of slow fading has ended and the optical afterglow has resumed a "normal" power-law decay.
GCN 9927 table
GRB_name GRB090715B
GCN_number 9927
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 9927 SUBJECT: GRB 090715B: Skynet/PROMPT Detections DATE: 09/09/21 04:34:58 GMT FROM: Josh Haislip at U.North Carolina J. Haislip, D. Reichart, 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 Swift/BAT localization of GRB 090715B (Vetere et al., GCN 9668) with three of the 16" PROMPT telescopes at CTIO beginning 3.1 hours after the trigger in UBRI. We detect the afterglow (Vetere et al., GCN 9668). Stacking only images that increase the limiting magnitude yields: mean 1-sig. 1-sig. time sys. stat. since cal. cal. cal. trig. tel. exp. fil. magnitude stars* unc. unc. (h) (# x s) (mag) (mag) 3.4 PROMPT-3 12 x 80 U > 17.5 (3 sig.) 10 SDSS 7 0.094 0.001 3.8 PROMPT-5 40 x 80 I 19.80 +0.40 -0.29 93 SDSS 7 0.268 0.000 3.8 PROMPT-4 41 x 80 R 20.31 +0.20 -0.17 78 SDSS 7 0.151 0.000 4.0 PROMPT-3 29 x 80 B > 20.8 (3 sig.) 37 SDSS 7 0.134 0.000 * Transformed using Jester et al., 2005, ApJ, 130, 873.