GRB160804A

This page lists all entries on GRB160804A in GRBweb

Summary Fermi GBM IPN Swift GCN 19761 GCN 19762 GCN 19763 GCN 19764 GCN 19765 GCN 19768 GCN 19769 GCN 19770 GCN 19771 GCN 19773 GCN 19774 GCN 19775 GCN 19776 GCN 19779 GCN 19813

Summary table
Variable Value Source
GRB_name_Fermi GRB160804065
T0 1:32:47 UTC GCN_circulars,Swift Det
ra 221.6298° Swift
decl 9.9991° Swift
pos_error 5.70e-05° Swift
T90 131.586 s Fermi_GBM
T90_error 21.723 s Fermi_GBM
T90_start 1:33:25.349 UTC Fermi_GBM
fluence 1.62e-05 erg/cm² Fermi_GBM
fluence_error 2.48e-07 erg/cm² Fermi_GBM
redshift 0.7360 GCN_circulars,Swift-BAT Det
T100 169.935 s
GBM_located False
mjd 57604.06443287037 GCN_circulars,Swift Det
Fermi GBM table
GRB_name_Fermi GRB160804065
trigger_name bn160804065
ra 221.6300°
decl 9.9989°
pos_error 3.92e+00°
datum 2016-08-04
t_trigger 1:34:16.038 UTC
T90 131.586 s
T90_error 21.723 s
T90_start 1:33:25.349 UTC
fluence 1.62e-05 erg/cm²
fluence_error 2.48e-07 erg/cm²
flux_1024 4.61e+00 erg/cm²/s
flux_1024_error 2.71e-01 erg/cm²/s
flux_1024_time 9.98e+00 erg/cm²/s
flux_64 7.24e+00 erg/cm²/s
flux_64_error 1.64e+00 erg/cm²/s
IPN table
GRB_name GRB160804A
ra 221.6375°
decl 10.0000°
pos_error 5.00e-02°
redshift 0.7360
Swift table
GRB_name GRB160804A
t_trigger 1:32:47 UTC
ra 221.6298°
decl 9.9991°
pos_error 5.70e-05°
T90 144.2 s
fluence 1.14e-05 erg/cm²
redshift 0.7360
GCN 19761 table
GRB_name GRB160804A
GCN_number 19761
Detection_method Swift Det
t_trigger 1:32:47 UTC
ra 221.6390°
decl 10.0010°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19761 SUBJECT: GRB 160804A: Swift detection of a burst DATE: 16/08/04 03:18:08 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT F. E. Marshall (NASA/GSFC), P. D'Avanzo (INAF-OAB), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 01:32:47 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160804A (trigger= 707231 ). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 221.639, +10.001 which is RA(J2000) = 14h 46m 33.4s Dec(J2000) = +10d 00m 03.6s with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The XRT began observing the field at 01:35:14 UT, 147 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 221.62909, +9.99599 which is equivalent to: RA(J2000) = 14h 46m 31.0s Dec(J2000) = +09d 59m 45.6s with an uncertainty of 5 arcseconds (radius, 90% containment). This location is 39 arcseconds from the BAT onboard position, within the BAT error circle. Due to bad weather near Guam, we only have limited information about this burst at this time. More information will be available after a full ground station pass. Burst Advocate for this burst is F. E. Marshall (marshall 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 19762 table
GRB_name GRB160804A
GCN_number 19762
Detection_method Swift-XRT Det
ra 221.6299°
decl 9.9989°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19762 SUBJECT: GRB 160804A: Enhanced Swift-XRT position DATE: 16/08/04 07:10:30 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 2427 s of XRT Photon Counting mode data and 5 UVOT images for GRB 160804A, 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 = 221.62988, +9.99889 which is equivalent to: RA (J2000): 14h 46m 31.17s Dec (J2000): +09d 59' 56.0" 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, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 19763 table
GRB_name GRB160804A
GCN_number 19763
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19763 SUBJECT: GRB 160804A: Swift-XRT refined Analysis DATE: 16/08/04 09:39:09 GMT FROM: Phil Evans at U of Leicester P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), A. D'Ai (INAF-IASFPA) and F.E. Marshall report on behalf of the Swift-XRT team: We have analysed 6.1 ks of XRT data for GRB 160804A (Marshall et al. GCN Circ. 19761), from 137 s to 18.0 ks after the BAT trigger. The data comprise 600 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. 19762). The late-time light curve (from T0+4.3 ks) can be modelled with a power-law decay with a decay index of alpha=0.32 (+0.20, -0.19). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.772 (+/-0.023). The best-fitting absorption column is 1.44 (+/-0.08) x 10^21 cm^-2, in excess of the Galactic value of 1.9 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.90 (+0.17, -0.16) and a best-fitting absorption column of 7.1 (+4.3, -3.8) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 7.1 (+4.3, -3.8) x 10^20 cm^-2 Galactic foreground: 1.9 x 10^20 cm^-2 Excess significance: 2.2 sigma Photon index: 1.90 (+0.17, -0.16) If the light curve continues to decay with a power-law decay index of 0.32, the count rate at T+24 hours will be 0.049 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-12 (1.9 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/00707231. This circular is an official product of the Swift-XRT team.
GCN 19764 table
GRB_name GRB160804A
GCN_number 19764
Detection_method Swift-UVOT Det
ra 221.6298°
decl 9.9991°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19764 SUBJECT: GRB 160804A: Swift/UVOT Detection DATE: 16/08/04 11:40:54 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (UCL-MSSL) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 160804A 82 s after the BAT trigger (Marshall et al., GCN Circ. 19761). A fading source consistent with the XRT position (Osborne et al. GCN Circ. 19762) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 14:46:31.14 = 221.62976 (deg.) Dec (J2000) = +09:59:56.7 = 9.99908 (deg.) with an estimated uncertainty of 0.44 arc sec. (radius, 90% confidence). Preliminary detections 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 82 232 147 18.56 ± 0.06 white 794 944 148 19.66 ± 0.12 v 570 6762 373 >19.9 b 496 6227 432 20.4 ± 0.24 u 240 490 246 19.53 ± 0.20 w1 4182 4382 197 18.90 ± 0.25 m2 1000 5612 216 >18.7 w2 546 6637 432 >19.5 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN 19765 table
GRB_name GRB160804A
GCN_number 19765
Detection_method Swift-BAT Det
ra 221.6520°
decl 10.0020°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19765 SUBJECT: GRB 160804A: Swift-BAT refined analysis DATE: 16/08/04 12:31:07 GMT FROM: Scott Barthelmy at NASA/GSFC H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 160804A (trigger #707231) (Marshall, et al., GCN Circ. 19761). The BAT ground-calculated position is RA, Dec = 221.652, 10.002 deg, which is RA(J2000) = 14h 46m 36.4s Dec(J2000) = +10d 00' 06.2" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 28%. The mask-weighted light curve shost several overlapping peaks starting at ~T+20sec (possibly at ~T-30 sec), peaking at ~T+90 sec, and returning to baseline at ~T+330 sec. T90 (15-350 keV) is 144.2 +- 19.2 sec (estimated error including systematics). The time-averaged spectrum from T+25.14 to T+247.15 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.40 +- 0.23, and Epeak of 52.7 +- 5.4 keV (chi squared 57.0 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.14 +- 0.03 x 10^-5 erg/cm2 and the 1-sec peak flux measured from T+88.59 sec in the 15-150 keV band is 2.9 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.99 +- 0.05 (chi squared 79.05 for 57 d.o.f.). 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/707231/BA/
GCN 19768 table
GRB_name GRB160804A
GCN_number 19768
Detection_method Swift-UVOT Other
ra 221.6298°
decl 9.9991°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19768 SUBJECT: GRB160804A: MASTER-SAAO observation DATE: 16/08/04 19:50:30 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs N.Tyurina, V. Lipunov, E. Gorbovskoy, V.Kornilov, P.Balanutsa, A.Kuznetsov, D.Kuvshinov, Lomonosov Moscow State University, Sternberg Astronomical Institute D.Buckley, S. Potter, A.Kniazev South African Astronomical Observatory N.M.Budnev, O.Gres, K.Ivanov, S.Yazev, V.A.Poleshchuk Irkutsk State University A. Tlatov, V.Senik, D. Dormidontov, A.V. Parhomenko Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk H.Levato , C.Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) F. Podest, C. Mallamaci, C. Lopez , R.Podesta Observatorio Astronomico Felix Aguilar (OAFA) R. Rebolo, M. Serra Ricart, N. Lodieu, G. Israelian The Instituto de Astrofisica de Canarias MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in SAAO was pointed to the GRB160804A (Swift trigger= 707231 came only from (Marshall et al., GCN19761) at 2016-08-04 17:59:48 UT (16h27m01s after the trigger time). We have set of images with unfiltered m_lim=20.7 (540s exposure). We see the Swift/UVOT source (Breeveld et al., GCN 19764) at Ra Dec (2000)=14:46:31.14 +09:59:56.7 with unfiltered m_OT~ 20.3. There is a Sloan galaxy in 0.182" with green g=21.7, red r=21.2m, i.e. possible host galaxy for this GRB.
GCN 19769 table
GRB_name GRB160804A
GCN_number 19769
Detection_method Fermi GBM Det
t_trigger 1:34:16.040 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 19769 SUBJECT: GRB 160804A: Fermi GBM observation DATE: 16/08/04 21:54:43 GMT FROM: Rachel Hamburg at UAH E. Bissaldi (Politecnico & INFN Bari), C. M. Hui (MSFC), V. Connaughton (USRA), and Rachel Hamburg (UAH) report on behalf of the Fermi GBM Team: "At 01:34:16.04 UT on 04 August 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 160804A (trigger 491967260 / 160804065), which was also detected by the Swift-BAT (Marshall et al. 2016, GCN 19761). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 87 degrees. The GBM light curve consists of single emission episode with a duration (T90) of about 130 s (50-300 keV). The time-averaged spectrum from T0-60 s to T0+70 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.1 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 74 +/- 3 keV. The event fluence (10-1000 keV) in this time interval is (1.5 +/- 0.3)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+10 s in the 10-1000 keV band is 4.6 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 19770 table
GRB_name GRB160804A
GCN_number 19770
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19770 SUBJECT: GRB 160804A: TNG optical observations, afterglow fading and candidate host galaxy DATE: 16/08/04 23:12:21 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani (DARK/NBI and DTU Space), P. D'Avanzo (INAF/OABr), A. Melandri (INAF/OABr), V. D'Elia (INAF/Roma and ASI/ASDC), A. Garcia de Gurtubai Escudero (INAF/TNG), and M. Pedani (INAF/TNG), report on behalf of the CIBO collaboration: We observed the field of GRB 160804A (Marshall et al., GCN 19761) with the Telescopio Nazionale Galileo (TNG) equipped with DOLoRes. Observations were carried out in the r and z filters. At the position of the optical afterglow (Breeveld & Marshall, GCN 19764), we clearly detect an extended object in both filters. Calibrating compared to nearby SDSS stars, we measure AB magnitudes r = 20.99 +- 0.04 and z = 19.99 +- 0.17. The mid time of the observations is Aug 4.89 UT, that is 0.83 days after the trigger. We note that this object is clearly visible in the SDSS frames, with catalog magnitudes of r = 21.22 +- 0.11 and z = 20.74 +- 0.35. It is classified as a galaxy with a (fairly uncertain) photometric redshift z <~ 0.5 This object is most likely the host galaxy of GRB 160804A. Our measurements are marginally (2 sigma) brighter than the SDSS values, though we caution that aperture effects on a low S/N extended object may be responsible for the difference. In any case, the afterglow is only contributing little flux at the epoch of the TNG observations. [GCN OPS NOTE(05aug16): Per author's request, AGdGE was added to the author list.]
GCN 19771 table
GRB_name GRB160804A
GCN_number 19771
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19771 SUBJECT: GRB 160804A: SAO RAS optical observations DATE: 16/08/05 01:07:20 GMT FROM: Moskvitin Alexander at SAO RAS A. S. Moskvitin, T. A. Fatkhullin (SAO RAS, Russia) and I. Soloviev (Saint-Petersburg Univ.), report on behalf of the larger team. We observed the field of the GRB 160804A (Marshall et al., GCN 19761) with the BTA, 6-meter telescope of SAO RAS, equipped with the Scorpio-I at 2016.08.04 17:52 UT (16.3 hours after the detection). A couple of Rc-band images (30 and 180 sec.) were obtained. The GRB OT (Breeveld & Marshall, GCN 19764; Tyurina et al., GCN 19768) is clearly detected in the stacked frame. The brightness of the object is R = 20.5 +/- 0.1 (calibration was done by the nearby SDSS stars, and Lupton 2005 transformation equations). The finding chart can be found at ftp://ftp.sao.ru/pub/grb/GRB160804A/GRB180804A_BTA.jpg
GCN 19773 table
GRB_name GRB160804A
GCN_number 19773
Detection_method Swift-BAT Det
redshift 0.7360
Circular_text TITLE: GCN CIRCULAR NUMBER: 19773 SUBJECT: GRB 160804A: VLT/X-shooter redshift DATE: 16/08/05 08:05:36 GMT FROM: Dong Xu at NAOC/CAS D. Xu (NAOC), K. E. Heintz (DARK/NBI), D. Malesani (DARK/NBI and DTU Space), K. Wiersema (U. Leicester), J. P. U. Fynbo (DARK/NBI), report on behalf of a larger collaboration: We observed the optical afterglow of GRB 160804A (Marshall et al., GCN 19761; Breeveld et al., GCN 19764) with the ESO VLT UT2 (Kueyen) equipped with the X-shooter spectrograph. Observations started at 23:55 UT on 2016-08-04 (22.37 hr after the BAT trigger) and consisted of 4 spectra by 600 s each, covering the wavelength range 3500-20000 AA. The continuum trace is well detected in our exposures, down to ~3100 AA. The lack of any drop sets an upper limit to the redshift z < 1.55. A number of superimposed absorption features are detected, which we interpret as due to Mg I, Mg II, Fe II, Al II, as well as emission features due to [O II], [O III], Halpha, Hbeta, Hgamma, [N II], [S II], [S III], all at a common redshift z = 0.736. We thus conclude this is the redshift of GRB 160804A. We acknowledge excellent support from the ESO observing staff in Paranal, in particular Jonathan Smoker, Leo Rivas, and Stephane Brillant.
GCN 19774 table
GRB_name GRB160804A
GCN_number 19774
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 19774 SUBJECT: GRB 160804A: GROND observations DATE: 16/08/05 15:06:51 GMT FROM: Jan Bolmer at MPE/Garching J. Bolmer and J. Greiner (both MPE Garching) report on behalf of the GROND team: We observed the field of GRB 160804A (Swift trigger 707231; Marshall et al., GCN #19761) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at the ESO La Silla Observatory (Chile). Observations started at 23:12:02 UT on 2016-08-04, 21.7 hr after the GRB trigger. They were performed at an average seeing of 1.3", at an average airmass of 1.5. We clearly detect the source reported by Breeveld et al. (GCN #19764), Tyurina et al. (GCN #19768), Malesani et al. (GCN #19770), Moskvitin et al. (GCN #19771) and Xu et al. (GCN #19773). Based on images with 84 min of total exposure in g'r'i'z' and 80 min in JHK at a mid-time of 00:15:10 UT on 2016-08-05, we derive the following preliminary magnitudes (all in AB system): g' = 21.50 +- 0.03 mag r' = 21.21 +- 0.03 mag i' = 20.85 +- 0.03 mag z' = 20.66 +- 0.03 mag J = 20.20 +- 0.07 mag H = 19.88 +- 0.07 mag K = 19.69 +- 0.12 mag Given magnitudes are calibrated against SDSS as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.02 mag in the direction of the burst (Schlafly & Finkbeiner 2011). We note that our r’- and z’-band magnitudes are consistent with the SDSS catalog magnitudes of the host galaxy (as reported by Malesani et al., GCN #19770).
GCN 19775 table
GRB_name GRB160804A
GCN_number 19775
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19775 SUBJECT: GRB 160804A: ISON/UAFO optical observations DATE: 16/08/05 15:40:06 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), E. Chornaya (UAFO, ISON), A. Matkin (UAFO), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 160804A (Marshall et al., GCN 19761) with SANTEL-650 (0.65m) telescope of UAFO/ISON-Ussuriysk observatory. We obtained several unfiltered images starting on August 04 (UT) 12:03:56. We clearly detected optical source reported by Breeveld et al. (GCN 19764), Tyurina et al. (GCN 19768), Malesani et al. (GCN 19770), Moskvitin et al. (GCN 19771), Xu et al. (GCN #19773) and Bolmer et al. (GCN 19774). Preliminary photometry of a combined image is following Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2016-08-04 12:03:56 0.46189 CR 60*120 19.90 0.27 21.6 Photometry is based on nearby SDSS DR9 stars SDSS-DR9_id R(Lupton) J144642.43+100147.7 18.068 J144642.15+100017.4 17.644 J144638.04+095917.6 17.971 J144635.67+095910.6 18.378 J144619.22+095958.1 16.677 J144616.60+100018.4 16.575 J144614.88+100001.4 16.544
GCN 19776 table
GRB_name GRB160804A
GCN_number 19776
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19776 SUBJECT: GRB 160804A: TSHAO optical observations DATE: 16/08/05 15:44:31 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I. Reva (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 160804A (Marshall et al., GCN 19761) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. We obtained several images in R filter starting on August 04 (UT) 15:08:18. We clearly detected optical source reported by Breeveld et al. (GCN 19764), Tyurina et al. (GCN 19768), Malesani et al. (GCN 19770), Moskvitin et al. (GCN 19771), Xu et al. (GCN #19773) and Bolmer et al. (GCN 19774). Preliminary photometry of a combined image is following Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2016-08-04 15:08:18 0.58601 R 26*120 20.30 0.10 21.4 Photometry is based on nearby SDSS DR9 stars SDSS-DR9_id R(Lupton) J144642.43+100147.7 18.068 J144642.15+100017.4 17.644 J144638.04+095917.6 17.971 J144635.67+095910.6 18.378 J144632.91+100104.9 17.910 J144619.22+095958.1 16.677 J144616.60+100018.4 16.575 J144614.88+100001.4 16.544
GCN 19779 table
GRB_name GRB160804A
GCN_number 19779
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 19779 SUBJECT: GRB 160804A: RATIR Optical and NIR Observations DATE: 16/08/05 17:40:09 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 160804A (Marshall et al., GCN Circular 19761) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2016/08 5.16 to 2016/08 5.27 UTC (26.33 to 29.04 hours after the BAT trigger), obtaining a total of 1.78 hours exposure in the r and i bands and 0.75 hours exposure in the Z, Y, J, and H bands. We detect a source coincident with Swift/UVOT source (Breeveld et al., GCN Circular 19764) with the following magnitudes and 3-sigma upper limit: r = 21.29 +/- 0.02 i = 20.90 +/- 0.02 Z = 21.12 +/- 0.19 Y = 21.04 +/- 0.29 J = 20.52 +/- 0.23 H > 20.51 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
GCN 19813 table
GRB_name GRB160804A
GCN_number 19813
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19813 SUBJECT: GRB 160804A: 15 GHz detections and upper limit from AMI DATE: 16/08/17 14:00:08 GMT FROM: Kunal Mooley at Oxford U K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), C. Rumsey, D. Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester) The AMI Large Array triggered on the Swift alert for GRB 160804A (Marshall et al., GCN 19761) as part of the 4pisky program, and subsequent follow up observations were obtained up to 12 days post-burst. Our observations at 15 GHz on 2016 Aug 04.85, Aug 05.75, Aug 07.75, Aug 11.75, and Aug 16.67 (UT) reveal a transient radio source at the XRT location (Osborne et al., GCN 19762), with flux densities of <141 uJy (3sigma), 189+/-46 uJy, 583+/-40 uJy, 292+/-34 uJy, and 168+/-38 uJy respectively. We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.