GRB180805B

This page lists all entries on GRB180805B in GRBweb

Summary Fermi GBM IPN Swift GCN 23076 GCN 23077 GCN 23078 GCN 23080 GCN 23082 GCN 23083 GCN 23085 GCN 23086 GCN 23087 GCN 23088 GCN 23089 GCN 23090 GCN 23108

Summary table
Variable Value Source
GRB_name_Fermi GRB180805543
T0 13:02:36 UTC GCN_circulars,Swift Det
ra 25.7817° Swift
decl -17.4935° Swift
pos_error 1.94e-04° Swift
T90 0.96 s Fermi_GBM
T90_error 0.59 s Fermi_GBM
T90_start 13:02:36.068 UTC Fermi_GBM
fluence 3.66e-07 erg/cm² Fermi_GBM
fluence_error 1.20e-08 erg/cm² Fermi_GBM
T100 122.5 s
GBM_located False
mjd 58335.54347222222 GCN_circulars,Swift Det
Fermi GBM table
GRB_name_Fermi GRB180805543
trigger_name bn180805543
ra 25.8129°
decl -17.5031°
pos_error 6.29e+00°
datum 2018-08-05
t_trigger 13:02:36.516 UTC
T90 0.96 s
T90_error 0.59 s
T90_start 13:02:36.068 UTC
fluence 3.66e-07 erg/cm²
fluence_error 1.20e-08 erg/cm²
flux_1024 2.57e+00 erg/cm²/s
flux_1024_error 2.28e-01 erg/cm²/s
flux_1024_time -6.40e-02 erg/cm²/s
flux_64 8.32e+00 erg/cm²/s
flux_64_error 1.13e+00 erg/cm²/s
IPN table
GRB_name GRB180805B
ra 25.8125°
decl -17.5000°
pos_error 5.00e-02°
Swift table
GRB_name GRB180805B
t_trigger 13:02:36 UTC
ra 25.7817°
decl -17.4935°
pos_error 1.94e-04°
T90 122.5 s
fluence 9.60e-07 erg/cm²
GCN 23076 table
GRB_name GRB180805B
GCN_number 23076
Detection_method Swift Det
t_trigger 13:02:36 UTC
ra 25.8130°
decl -17.5030°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23076 SUBJECT: GRB 180805B: Swift detection of a burst DATE: 18/08/05 13:18:15 GMT FROM: Boris Sbarufatti at PSU P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 13:02:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180805B (trigger=851855). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 25.813, -17.503 which is RA(J2000) = 01h 43m 15s Dec(J2000) = -17d 30' 11" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 1.5 sec. The peak count rate was ~4000 counts/sec (15-350 keV), at ~0.1 sec after the trigger. The XRT began observing the field at 13:03:53.2 UT, 76.8 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 25.7814, -17.4926 which is equivalent to: RA(J2000) = 01h 43m 07.55s Dec(J2000) = -17d 29' 33.2" with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 114 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.63 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.1 (+2.89/-2.44) x 10^21 cm^-2 (90% confidence). The initial flux in the 2.5 s image was 1.14e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 84 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 0.02. Burst Advocate for this burst is P. D'Avanzo (paolo.davanzo AT brera.inaf.it). 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 23077 table
GRB_name GRB180805B
GCN_number 23077
Detection_method Swift-XRT Det
ra 25.7817°
decl -17.4934°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23077 SUBJECT: GRB 180805B: Enhanced Swift-XRT position DATE: 18/08/05 16:08:45 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 1323 s of XRT Photon Counting mode data and 1 UVOT images for GRB 180805B, 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 = 25.78171, -17.49345 which is equivalent to: RA (J2000): 01h 43m 7.61s Dec (J2000): -17d 29' 36.4" with an uncertainty of 1.8 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 23078 table
GRB_name GRB180805B
GCN_number 23078
Detection_method Fermi GBM Det
t_trigger 13:02:36.520 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 23078 SUBJECT: GRB 180805B: Fermi GBM detection DATE: 18/08/05 22:07:27 GMT FROM: Rachel Hamburg at UAH R. Hamburg (UAH), A. von Kienlin (MPE), and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 13:02:36.52 UT on 05 August 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180805B (trigger 555166961 / 180805543) which was also detected by the Swift BAT and XRT instruments (D'Avanzo et al. 2018, GCN 23076). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 64 degrees. The GBM light curve shows a single peak with a duration (T90) of about 1 s (50-300 keV). The time-averaged spectrum from T0-0.13 s to T0+0.58 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.5 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 346 +/- 75 keV. The event fluence (10-1000 keV) in this time interval is (5.9 +/- 0.7)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.06 s in the 10-1000 keV band is 8.3 +/- 1.1 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 23080 table
GRB_name GRB180805B
GCN_number 23080
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 23080 SUBJECT: GRB 180805B: Swift/UVOT Upper Limits DATE: 18/08/05 22:12:32 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and P. D'Avanzo (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 180805B 85 s after the BAT trigger (D'Avanzo et al., GCN Circ. 23076). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 23077) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 85 235 147 >20.8 u_FC 297 546 246 >20.2 white 85 1544 392 >21.3 v 626 1421 78 >18.6 b 552 1519 97 >20.0 u 297 546 246 >20.2 w1 675 1470 97 >18.8 m2 1078 1097 19 >17.8 w2 774 1569 78 >19.0 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN 23082 table
GRB_name GRB180805B
GCN_number 23082
Detection_method Swift-BAT Det
ra 25.8770°
decl -17.4750°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23082 SUBJECT: GRB 180805B: Swift-BAT refined analysis (short GRB with extended emission) DATE: 18/08/06 02:00:36 GMT FROM: Amy Lien at GSFC T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. D'Avanzo (INAF-OAB), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), J. P. Norris (BSU), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (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 180805B (trigger #851855) (D'Avanzo et al., GCN Circ. 23076). The BAT ground-calculated position is RA, Dec = 25.877, -17.475 deg which is RA(J2000) = 01h 43m 30.6s Dec(J2000) = -17d 28' 29.3" with an uncertainty of 3.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 67%. The mask-weighted light curve show a short pulse that starts from ~T-0.1 s, peaks at ~T+0.1 s, and ends at ~T+0.7 s. The short pulse is followed by some weak emission that lasts until ~ T+130 s. T90 (15-350 keV) is 122.5 +- 18.3 sec (estimated error including systematics). The time-averaged spectrum from T-0.10 to T+127.46 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.13 +- 0.29. The fluence in the 15-150 keV band is 9.6 +- 1.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.11 sec in the 15-150 keV band is 1.7 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The structure of the burst shows similarity to those of short GRBs with extended emission. We thus perform further analysis on the short spike and the tail emission. The spectrum of the short pulse from T-0.001 to T+0.712 sec can be fitted by a simple power-law model with power-law index of 0.66 +- 0.20 and fluence (15-150 keV) of 1.7 +- 0.2 x 10^-7 erg/cm2. The spectrum of the extended emission from T+0.712 to T+126.532 sec is best fit by a simple power-law model, with power-law index of 1.16 +- 0.39 and fluence (15-150 keV) of 6.8 +- 1.6 x 10^-7 erg/cm2. These values are consistent with those of short GRBs with extended emission (Lien & Sakamoto et al. 2016). The lag analysis does not produce a well-constrained value due to the weakness of the short pulse. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/851855/BA/
GCN 23083 table
GRB_name GRB180805B
GCN_number 23083
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 23083 SUBJECT: GRB 180805B: Swift-XRT refined Analysis DATE: 18/08/06 02:03:06 GMT FROM: Phil Evans at U of Leicester S. J. LaPorte (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), A. Melandri (INAF-OAB), V. D'Elia (ASDC), B. Sbarufatti (INAF-OAB/PSU) and P. D'Avanzo report on behalf of the Swift-XRT team: We have analysed 6.6 ks of XRT data for GRB 180805B (D'Avanzo et al. GCN Circ. 23076), from 82 s to 36.7 ks after the BAT trigger. The data comprise 197 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 23077). The light curve can be modelled with a series of power-law decays. The light curve initially rises, with an index alpha=-1.5 (+0.0, -0.5). At T+102 s it breaks to an alpha of 1.61 (+0.15, -0.65). The light curve breaks again at T+241 s to a decay with alpha=3.1 (+/-0.4), before a final break at T+891 s s after which the decay index is 0.88 (+0.21, -0.18). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 0.93 (+0.09, -0.06). The best-fitting absorption column is 2.3 (+4.7, -0.7) x 10^20 cm^-2, consistent with the Galactic value of 1.6 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.90 (+0.25, -0.23) and a best-fitting absorption column of 7.3 (+6.6, -5.4) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 7.3 (+6.6, -5.4) x 10^20 cm^-2 Galactic foreground: 1.6 x 10^20 cm^-2 Excess significance: 1.7 sigma Photon index: 1.90 (+0.25, -0.23) If the light curve continues to decay with a power-law decay index of 0.88, the count rate at T+24 hours will be 2.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.8 x 10^-14 (7.8 x 10^-14) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00851855. This circular is an official product of the Swift-XRT team.
GCN 23085 table
GRB_name GRB180805B
GCN_number 23085
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23085 SUBJECT: GRB 180805B: MASTER optical late inspection short GRB with extended emission DATE: 18/08/06 10:52:37 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, N.Tiurina, E. Gorbovskoy, V.Kornilov, A.Kuznetsov, V.Chazov, I. Gorbunov, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov, D. Vlasenko Lomonosov Moscow State University,SAI D. Buckley, South African Astronomical Observatory (SAAO) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias (IAC) A. Tlatov, V.Senik, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory R. Podesta, F. Podesta, C. Lopez, C.Francile Observatorio Astronomico Felix Aguilar (OAFA) H.Levato, Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) O. Gres, N.M.Budnev , Yu.Ishmuhametova Irkutsk State University (ISU) A. Gabovich, V. Yurkov, Yu. Sergienko Blagoveschensk Educational State University (BSPU) MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in SAAO was starting survey on the Swift short GRB with extended emission GRB180805B (D'Avanzo et al., GCN #23076; Hamburg et al., GCN #23078;Sakamoto et al., GCN #23082) error-box (Evans et al., GCN #23077; ) 37838 sec after notice time and 38322 sec after trigger time at 2018-08-05 23:46:00 UT. The 5-sigma upper limit on our first (180s exposure) set is about 20.5 mag There is no OT detected. The message may be cited.
GCN 23086 table
GRB_name GRB180805B
GCN_number 23086
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23086 SUBJECT: GRB 180805B: VLT optical and near-infrared observations DATE: 18/08/06 13:01:16 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. B. Malesani (DAWN/NBI and DARK/NBI), G. Pugliese (API/Univ. Amsterdam), P. D'Avanzo (INAF/Brera), N. R. Tanvir (Univ. Leicester), K. Wiersema (Univ. Warwick), report on behalf of the Stargate consortium: We observed the field of GRB 180805B, classified as short with extended emission (D'Avanzo et al., GCN 23076; Sakamoto et al., GCN 23082), using the ESO Telescopes located in Cerro Paranal. Optical and near-infrared observations were obtained using the FORS2 and HAWK-I instruments, respectively. No counterpart is detected inside the UVOT-enhanced XRT error circle (Evans et al., GCN 23077) in either images, with the 3-sigma upper limits summarized in the table below. Filter Mid time (UT) Time since GRB (hr) Limiting mag (Vega) --------------------------------------------------------------- J Aug 6.245 16.84 23.5 R Aug 6.363 19.67 25.5 Calibration was carried out against a single 2MASS star for the J band, and using archival FORS2 zeropoints for the R band. We note the presence of four extended objects within a few arcsec of the center of the XRT error circle, including a source 3.5" North of the GRB (R ~ 22.5) also visible in the Pan-STARRS r and i images. Their association with the GRB cannot be assessed at the present time. We acknowledge excellent support from the ESO observing staff in Paranal, especially Stephane Brillant, Joe Anderson, and Bian Fuyan. DBM also acknowledges useful discussion with Amy Lien (GSFC/UMBC) about the classification of this GRB.
GCN 23087 table
GRB_name GRB180805B
GCN_number 23087
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23087 SUBJECT: GRB 180805B: GOTO optical limits DATE: 18/08/06 14:26:16 GMT FROM: Danny Steeghs at U.of Warwick/GOTO G.Ramsay (Armagh O.), K.Ulaczyk, D.Steeghs, J.Lyman (U. Warwick), M.Dyer (U. Sheffield), B.Gompertz, A.Levan, R.Cutter (U. Warwick) K. Ackley, D.Galloway, E.Rol (Monash U.), V.Dhillon (U. Sheffield), P.O'Brien, R.Starling (U. Leicester), S.Poshyachinda (NARIT), D.Pollacco (U. Warwick), E.Thrane (Monash U.), E.Palle (IAC) report on behalf of the GOTO collaboration: In response to GRB 180805B (D'Avanzo et al. GCN 23076), the Gravitational-wave Optical Transient Observer (GOTO) observed the field near the Swift BAT/XRT detection. Observations started at 2018-08-06T04:37:59 UT (15.5 hours after the burst) consisting of a set of 6x120s exposures in our wide L filter (400-700nm). We do not detect any optical source within the error circle of the enhanced XRT location (Evans et al. GCN 23077) with a 5-sigma limit of V=20.4, using APASS calibrators on the stacked image. We note that our observations were obtained between those of Lupinov et al. GCN 23085 and Malesani et al. GCN 23086. GOTO is operated at the La Palma observing facilities of the University of Warwick on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT) and the Instituto de Astrofisica de Canarias (IAC) https://goto-observatory.org/
GCN 23088 table
GRB_name GRB180805B
GCN_number 23088
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 23088 SUBJECT: GRB 180805B: 1.5m OSN I-band observation DATE: 18/08/06 15:06:38 GMT FROM: Youdong HU at IAA-CSIC, UGR Y.-D. Hu, F.J. Aceituno, J. C. Tello and A.J. Castro-Tirado (IAA-CSIC Granada), on behalf of a larger collaboration, report: Following the detection of GRB 180805B (short burst with extended emission) by Swift (D'Avanzo et al. GCNC 23076, Sakamoto et al. GCNC 23082), optical images in the I-band were obtained at the 1.5m OSN telescope in Granada (Spain) starting at 03:08 (Aug 6), i.e. ~14 h postburst. No optical afterglow is detected in the co-added image (7 x 300s, mid time at 03:26 UT, 14.4 h after the trigger) within the enhanced Swift/XRT error box (Evans et al. GCNC 23077) down to I=21.0, which is in agreement with the non-detections reported by Lipunov et al. (GCNC 23085), Malesani et al. (GCNC 23086) and Ramsay et al.(GCNC 23087).
GCN 23089 table
GRB_name GRB180805B
GCN_number 23089
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23089 SUBJECT: GRB 180805B: COATLI Optical Observations DATE: 18/08/06 17:18:16 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), William H. Lee (UNAM), Carlos Román-Zúñiga (UNAM), Alexander Kutyrev (GSFC), and Eleonora Troja (GSFC) report: We observed the field of the short GRB 180805B (D'Avanzo et al., GCN Circ. 23076) with the COATLI 50-cm telescope and interim imager at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir (http://coatli.astroscu.unam.mx) from 2018-08-06 08:01 to 11:48 UTC (18.98 to 22.77 hours after the trigger), obtaining a total of 2.98 hours of exposure in the w filter. We do not detect any optical sources within the enhanced XRT error region (Evans et al., GCN Circ. 23077) to a 5-sigma limiting magnitude of w > 22.5 This magnitude is calibrated against the USNO-B1 catalog (adjusted to an approximate AB system) and is not corrected for Galactic extinction in the direction of the GRB. We thank the COATLI technical team (Fernando Ángeles, Oscar Chapa, Salvador Cuevas, Alejandro Farah, Jorge Fuentes, Rosalía Langarica, Fernando Quirós, and Carlos Tejada) and the staff of the Observatorio Astronómico Nacional.
GCN 23090 table
GRB_name GRB180805B
GCN_number 23090
Detection_method Optical
ra 25.7811°
decl -17.4752°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23090 SUBJECT: GRB 180805B: ESO/NTT optical observations DATE: 18/08/06 20:36:48 GMT FROM: Klaas Wiersema at U of Warwick A. Higgins (Univ. Leicester), K. Wiersema (Univ. Warwick) and D. B. Malesani (DAWN/NBI and DARK/NBI) report: We observed the field of GRB 180805B, classified as short with extended emission (D'Avanzo et al., GCN 23076; Sakamoto et al., GCN 23082), using the ESO New Technology Telescope (NTT) equipped with the EFOSC2 camera. Our observations consist of 9 images in i band, for a total of 1800 s exposure, with mid time 2018 August 6.28 UT (17.76 hr after the GRB trigger), and were obtained as part of the SPLOT programme (Higgins et al. 2018, subm.). No counterpart is detected inside the UVOT-enhanced XRT error circle (Evans et al., GCN 23077) in our coadded image, down to a 3-sigma upper limit i > 25 (AB), adopting i = 20.56 for the Pan-STARRS star at RA = 01:43:07.462, Dec = -17:28:30.90. We thank D. Castex for support with these observations.
GCN 23108 table
GRB_name GRB180805B
GCN_number 23108
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23108 SUBJECT: GRB 180805B: Teide LCO optical observations DATE: 18/08/09 22:48:10 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Daniele B. Malesani (DAWN/NBI and DARK/NBI) and Nicolas Crouzet (IAC) report: We observed the field of the short GRB 180805B (D'Avanzo et al., GCN 23076; Sakamoto et al., GCN 23082) using one of the 40-cm telescopes located in the Teide observatory (Canary Islands), part of the Las Cumbres Observatory network. Observations consisted of 9x300 s exposures in the SDSS r filter, centered around the mean epoch Aug 6.19 UT (15.49 hr after the GRB). The PSF delivered to the image is around 3". No object is detected within or close to the X-ray afterglow error circle (Evans et al., GCN 23077), down to a 3-sigma limiting magnitude of r = 20 AB, calibrated using nearby stars from the Pan-STARRS catalog.