//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27736 SUBJECT: GRB 200514B: Fermi GBM Final Real-time Localization DATE: 20/05/14 09:17:53 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 09:07:37 UT on 14 May 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200514B (trigger 611140062.123856 / 200514380). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 238.3, Dec = 37.2 (J2000 degrees, equivalent to J2000 15h 53m, 37d 12'), with a statistical uncertainty of 13.1 degrees. The angle from the Fermi LAT boresight is 63.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200514380/quicklook/glg_skymap_all_bn200514380.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200514380/quicklook/glg_healpix_all_bn200514380.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200514380/quicklook/glg_lc_medres34_bn200514380.gif //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27737 SUBJECT: GRB200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062) DATE: 20/05/14 18:20:05 GMT FROM: Tomas Ahumada at U. of Maryland Tomas Ahumada (UMD), Shreya Anand (Caltech), Igor Andreoni (Caltech), Michael Coughlin (UMN), Erik Kool (OKC), Simeon Reusch (DESY), Ana Sagués Carracedo (OKC), Robert Stein (DESY) on behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations We observed the localization region of the short GRB200514B (trigger 611140062) detected by the Gamma-Ray Burst Monitor (GBM) on the Fermi satellite with the Palomar 48 inch telescope equipped with the 47 square degree Zwicky Transient Facility (ZTF) camera. We obtained a series of g- and r-band images covering 519.3 square degrees beginning at 10:01 UT on 2020 May 14 (0.9 hours after the burst trigger time). This corresponds to ~49% of the probability enclosed in the GRB localization map (GCN 27736). Each exposure was 300s, reaching a g-band median depth of 21.8 mag and r-band median depth of 22.0 mag. The images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC (Masci et al. 2019). We queried the ZTF alert stream using Kowalski (Duev et al. 2019) and AMPEL (Nordin et al. 2019). We required at least 2 detections separated by at least 15 minutes to select against moving objects. Furthermore, we cross-matched our candidates with the Minor Planet Center to flag known asteroids, reject stellar sources (Tachibana and Miller 2018), and apply machine learning algorithms (Mahabal et al. 2019). We require no spatially coincident ZTF alert to be issued before the detection time of the GBM trigger. The candidates within the 90% probability contour of the GRB localization map that passed the automatic selection criteria and human vetting are presented in the table below. +----------------------------------------------------------------------------------------------------+ | ZTF Name | IAU Name | RA (deg) | DEC (deg) | Filter | Mag | MagErr | MJD | Notes | +----------------------------------------------------------------------------------------------------+ | ZTF20aazpphd | AT 2020jww | 242.7149675 | +27.1616870 | r | 19.6 | 0.05 | 58983.49 | | | ZTF20aazppnv | AT 2020jxa | 238.1438691 | +25.5764946 | r | 21.1 | 0.17 | 58983.49 | (b,c) | | ZTF20aazprjq | AT 2020jxb | 233.5213585 | +43.3298714 | r | 21.3 | 0.13 | 58983.47 | (a,d) | | ZTF20aazptlp | AT 2020jxd | 229.007524 | +48.774925 | r | 21.5 | 0.19 | 58983.48 | (a,e) | | ZTF20aazptnn | AT 2020jxc | 237.2967278 | +47.271954 | r | 21.6 | 0.17 | 58983.48 | (a,f) | | ZTF20aazpnst | AT 2020jxn | 254.0989833 | +34.4655542 | r | 22.0 | 0.20 | 58983.47 | (a,g) | | ZTF20aazpofi | AT 2020jxm | 236.929525 | +46.9809542 | r | 21.5 | 0.13 | 58983.48 | (a,h) | +----------------------------------------------------------------------------------------------------+ We highlight ZTF20aazpphd, as it is offset 12 arcseconds from the center of a galaxy at 160 Mpc and was not detected 2.15 days earlier with a limiting magnitude of g > 20.53. The host spectroscopic redshift is z = 0.04573, which would imply a g-band absolute magnitude of -17.23. Notes: (a) Offset from faint host (b) Nuclear (c) SDSS photoz = 0.170 +- 0.03 (d) SDSS photoz = 0.226 +- 0.04 (e) SDSS photoz = 0.402 +- 0.11 (f) SDSS photoz = 0.261 +- 0.06 (g) SDSS photoz = 0.188 +- 0.05 (h) SDSS photoz = 0.464 +- 0.08 ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27738 SUBJECT: GRB200514B: ATLAS detections of ZTF20aazpphd DATE: 20/05/14 20:36:48 GMT FROM: Stephen Smartt at Queen's U/Belfast S. J. Smartt, K. W. Smith (QUB), S. Srivastav, T.-W. Chen (MPE), D. R. Young, M. Fulton, (QUB) L. Denneau, H. Flewelling, A. Heinze, J. Tonry, H. Weiland (IfA, Univ. Hawaii), A. Rest (STScI), B. Stalder (LSST), C. Stubbs (Harvard), O. McBrien, J. Gillanders, D. O'Neil, P. Clark (QUB) The transient ZTF20aazpphd (AT2020jww) was reported by Ahumada et al. (GCN 27737) at r = 19.6 +/- 0.05 within the localization region of the short GRB200514B (trigger 611140062) detected by the Gamma-Ray Burst Monitor (GBM) on the Fermi satellite at MJD = 58983.38029 (GCN 27736). ATLAS, the twin telescope system on Haleakala and Mauna Loa was observing this region of sky in normal sky operations (Tonry et al. 2018, PASP, 130f4505, Smith et al. 2020, arXiv:2003.09052). We detect ZTF20aazpphd before the ZTF epoch at the following magnitudes : ATLAS c-band : MJD dt m err 58983.42278 +1.02 19.47 0.13 58983.42461 +1.06 19.18 0.20 58983.43478 +1.31 19.46 0.13 58983.43890 +1.41 19.42 0.21 where dt is the time in hrs since Fermi trigger. ZTF reported the r-band : 58983.49 +2.63 19.6 0.05 The first ATLAS detection is 1.61hrs before the ZTF in the cyan-band (a composite g+r filter). The two magnitudes are consistent, given the errors and the different filter profiles. Therefore there is no evidence of any rapid decline within this short interval, as might be expected for a sGRB afterglow. We also have non-detections of ZTF20aazpphd 2 days before, hence it is more likely a young supernova. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27739 SUBJECT: GRB 200514B: GROWTH-India follow-up of ZTF20aazpphd (AT2020jww) DATE: 20/05/14 22:39:14 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay H. Kumar, V. Bhalerao(IITB), G. C. Anupama, S. Barway(IIA), U. Stanzin(IAO) report on behalf of the GROWTH-India collaboration: We observed ZTF20aazpphd (AT2020jww) reported by (T. Ahumada et al., GCN 27737, S. J. Smartt et al., GCN 27738) with 0.7m GROWTH-India telescope. We obtained g band exposures starting at UT 20-05-14T17:22:52. The transient was reported in GCN 27737 as a followup of the GRB200514B event detected by Fermi GBM (GCN 27736). We obtained the following photometric results:- ------------------------------------------------------------------ MJD(Start)| T-T0(hrs) | Exposure(sec) | Filter | Mag | ------------------------------------------------------------------ 58983.724 | 8.25 | 600 | g | 19.20 +/- 0.04 | 58983.732 | 8.44 | 600 | g | 19.15 +/- 0.04| 58983.863 | 11.58 | 500 | g | 19.12 +/- 0.05 | ------------------------------------------------------------------ The transient is not fading like a GRB afterglow as per our observation in the g band. Hence, seems unrelated to the GRB200514B event. The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27740 SUBJECT: Optical transient ZTF20aazpphd is unrelated to GRB 200514B DATE: 20/05/14 22:45:08 GMT FROM: Christian Malacaria at NASA-MSFC/USRA C. Malacaria (NASA/MSFC-USRA) and E. Burns (GSFC) report on behalf of the Fermi-GBM Team: At 09:07:37 UT on 14 May 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200514B (GCN 27736, Fermi-GBM Team). Follow-up observations by the Zwicky Transient Facility identified ZTF20aazpphd as a potential optical counterpart to GRB 200514B (Ahumada et al., GCN 27737). ZTF20aazpphd was subsequently observed by ATLAS, who found no evidence for rapid decline (Smartt et al., GCN 27738), contrary to what expected for a short GRB afterglow. We also verified that, when GBM triggered on GRB 200514B, the source position for ZTF20aazpphd as observed by GBM was occulted by Earth and therefore unobservable. We therefore conclude that the optical transient ZTF20aazpphd is unrelated to GRB 200514B. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27741 SUBJECT: GRB200514B: YSE detection of ZTF20aazpphd DATE: 20/05/14 23:00:35 GMT FROM: David Jones at UC,Santa Cruz D. O. Jones (UC Santa Cruz), K. D. French (Carnegie, Illinois), A. Agnello, C. R. Angus, Z. Ansari, N. Arendse, C. Gall, C. Grillo, S. H. Bruun, C. Hede, J. Hjorth, L. Izzo, H. Korhonen, S. Raimundo, D. Kodi Ramanah, A. Sarangi, R. Wojtak (DARK, U Copenhagen), K. Auchettl (DARK, UC Santa Cruz, U Melbourne), K. C. Chambers, M. E. Huber, E. A. Magnier, T. J. L. de Boer, J. R. Fairlamb, C. C. Lin, R. J. Wainscoat, T. Lowe, M. Willman, J. Bulger, A. S. B. Schultz (IfA, Hawaii), A. Engel, A. Gagliano, G. Narayan, M. Soraisam (Illinois), Q. Wang (JHU), A. Rest (JHU, STScI), S. J. Smartt, K. W. Smith (Queen's University Belfast), K. D. Alexander, A. Baldeschi, P. Blanchard, D. Coppejans, L. DeMarchi, A. Hajela, W. Jacobson-Galan, R. Margutti, D. Matthews, C. Stauffer, M. Stroh, G. Terreran (Northwestern), M. Drout (U Toronto), D. A. Coulter, G. Dimitriadis, R. J. Foley, T. Hung, C. D. Kilpatrick, C. Rojas-Bravo, M. R. Siebert (UC Santa Cruz), E. Ramirez-Ruiz (UC Santa Cruz, DARK) The ZTF and ATLAS collaborations (Ahumada et al., GCN 27737; Smartt et al., GCN 27738) have both reported observations of ZTF20aazpphd (AT2020jww), a transient within the localization region of short GRB200514B (trigger 611140062). GRB200514B was detected at MJD = 58983.38029 by the Gamma-Ray Burst Monitor on the Fermi satellite (GCN 27736). The Young Supernova Experiment (YSE; ATel 13330) also observed this region of the sky with Pan-STARRS1 on Haleakala (Chambers et al., 2016). We detected ZTF20aazpphd in gi bands with an g-i color of -0.57 +/- 0.12 mag: MJD dt band mag mag_err 58983.52303 +3.43 g_P1 19.197 0.079 58983.52573 +3.49 i_P1 19.766 0.094 The dt column is the time since GRB200514B was discovered in hours. These measurements were taken 0.8 hours after the ZTF r-band observation, 1.75 hours after the ZTF g observation and 2.4 hours after ATLAS observations (Smartt et al., GCN 27738). They are consistent with magnitudes from ZTF (g = 19.249 +/- 0.047) and ATLAS. Our data do not show evidence for the rapid decline characteristic of a sGRB over the time baseline of ~2.4 hours. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27745 SUBJECT: GRB 200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062) - More Candidates DATE: 20/05/15 21:42:13 GMT FROM: Shreya Anand at GROWTH Caltech Simeon Reusch (DESY), Tomas Ahumada (UMD), Shreya Anand (Caltech), Michael Coughlin (UMN), Mansi M. Kasliwal (Caltech), Erik Kool (OKC), Harsh Kumar (IIT-B), Robert Stein (DESY), Igor Andreoni (Caltech), Varun Bhalerao (IIT-B), Albert Kong (NTHU) and Leo Singer (NASA/GSFC) on behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations We re-observed the localization region of the short GRB200514B (trigger 611140062) detected by the Gamma-Ray Burst Monitor (GBM) on the Fermi satellite with the Palomar 48 inch telescope equipped with the 47 square degree Zwicky Transient Facility (ZTF) camera. We obtained a series of g- and r-band images covering 570 square degrees beginning at 09:58 UT on 2020 May 15 (24.83 hours after the burst trigger time). This corresponds to ~71% of the probability enclosed in the Earth-occultation corrected GRB localization map (GCN 27736). Each exposure was 300s, reaching g-band and r-band median depths of 22.4 and 22.2 mag respectively. The images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC (Masci et al. 2019). We queried the ZTF alert stream using Kowalski (Duev et al. 2019) and AMPEL (Nordin et al. 2019). We required at least 2 detections separated by at least 15 minutes to select against moving objects. Furthermore, we cross-match our candidates with the Minor Planet Center to flag known asteroids, reject stellar sources (Tachibana and Miller 2018), and apply machine learning algorithms (Mahabal et al. 2019). We require that no spatially coincident ZTF alerts were issued before the detection time of the GBM trigger. The candidates within the 90% probability contour of the GRB localization map that pass these selection criteria as well as human vetting are presented in the table below. The filter, magnitude and MJD columns correspond to the ZTF first alert, while the Decline Rate (D.R) is in [mag/day]. +----------------------------------------------------------------------------------------------------------------------+ | ZTF Name     | IAU Name   | RA (deg)    | DEC (deg)  | Filter | Mag  | MagErr | MJD      | D.R. [mag/day] | Notes    | +----------------------------------------------------------------------------------------------------------------------+ | ZTF20aazplwp | AT 2020jzo | 234.0167814 | 41.1672761 |    r   | 21.6 |  0.15  | 58984.45 | 0.3 in g       | (a)      | | ZTF20aazqlgx | AT 2020jzr | 246.0908608 | 34.6259478 |    r   | 22.3 |  0.19  | 58984.45 | 0.3 in r       | (c)(1)   | | ZTF20aazphye | AT 2020jzn | 255.6577428 | 41.7013160 |    r   | 21.6 |  0.15  | 58984.47 | 0.3 in g       | (c,d)(2) | | ZTF20aazpnxd | AT 2020kap | 255.931646  | 48.3862806 |    r   | 21.6 |  0.16  | 58984.47 | 0.3 in g       | (a)      | | ZTF20aazpkri | AT 2020kaq | 240.7324792 | 48.5554957 |    r   | 21.3 |  0.10  | 58984.46 | 0              | (a)      | | ZTF20aazqndp | AT 2020kal | 237.8212032 | 50.4933039 |    r   | 22.1 |  0.15  | 58984.46 | 0              | (c,d)(3) | | ZTF20aazqpps | AT 2020kam | 252.2388065 | 41.3097433 |    r   | 21.6 |  0.14  | 58984.47 | 0              | (c,d)(4) | +----------------------------------------------------------------------------------------------------------------------+ Notes: (a) hostless (b) offset from a galaxy (c) nuclear (d) PS1 detection at source position (1) SDSS phot-z = 0.35 +/- 0.10 (2) SDSS phot-z = 0.26 +/- 0.04 (3) CLU z = 0.03195 (4) SDSS phot-z = 0.2 +/- 0.03 ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27748 SUBJECT: GRB 200514B: BALROG localization (Fermi Trigger 611140062 / GRB 200514380) DATE: 20/05/16 20:33:50 GMT FROM: Jochen Greiner at MPI J.M. Burgess, J. Greiner, F. Berlato, B. Biltzinger, F. Kunzweiler (all MPE Garching) report: Given the interest in this GRB and the optical follow-up work, we performed a more thorough analysis of the GRB 200514B with the BALROG localization/spectral fitting method (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60), finding a localization of RA (2000.0) = 260 +/- 12 Decl. (2000.0) = 58.8 +/- 6.8 (1 sigma error). The Healpix map can be found at: http://mpe.mpg.de/~jcg/grb200514B/GRB200514380_balrog_healpix.fits Spectral analysis of the time interval T0 = -0.38 ... 0.58s with the empirical Band function yields the following best-fit spectral parameters: alpha = -0.63 +/- 0.30 beta = -2.13 +/- 0.29 Ep = 170 +/- 70 keV with an energy flux of (3.5 +/-2) x 10^-7 erg/cm2/s in the 10-1000 keV band. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27755 SUBJECT: IPN triangulation of GRB 200514B (short) DATE: 20/05/18 21:31:32 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The short-duration GRB 200514B (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27736; BALROG localization: Burgess et al., GCN Circ. 27748) was detected by Fermi (GBM trigger 606799116), INTEGRAL (SPI-ACS), and Konus-Wind in the waiting mode, at about 32857 s UT (09:07:37). We have triangulated it to a Konus-GBM annulus centerd at RA(2000)=233.253 deg (15h 33m 01s) Dec(2000)=-18.040 deg (-18d 02' 24"), whose radius is 79.909 +/- 20.599 deg (3 sigma), and to a GBM-INTEGRAL annulus centered at RA(2000)=209.576 deg (13h 58m 18s) Dec(2000)=+50.867 deg (+50d 52' 01"), whose radius is 33.883 +/- 33.883 deg (3 sigma). The IPN localization is consistent with, but reduces the area of the Fermi-GBM ones (GCN 27736, GCN 27748). This localization may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200514_T32857/IPN //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 27774 SUBJECT: GRB 200514B: Fermi GBM observation DATE: 20/05/21 15:37:06 GMT FROM: Elisabetta Bissaldi at INFN,Bari E. Bissaldi (Politecnico and INFN Bari), C. Malacaria (NASA/MSFC-USRA), S. Poolakil (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 09:07:37.12 UT on 14 May 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200514B (trigger 611140062 / 200514380). The GBM on-ground location was reported in GCN #27736 and is consistent with the position triangulated by the IPN (Svinkin et al., 2020, GCN #27755). The angle from the Fermi LAT boresight at the GBM trigger time is 63 degrees. The GBM light curve shows a structured emission episode with a duration (T90) of about 1.7 s (50-300 keV). The time-averaged spectrum from T0-0.380 s to T0+0.260 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.06 +/- 0.11 and the cutoff energy, parameterized as Epeak, is 1700 +/- 900 keV. The event fluence (10-1000 keV) in this time interval is (4.8 +/- 0.6)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0-0.32 s in the 10-1000 keV band is 3.1 +/- 0.8 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"