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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

5559 results found.

  1. GRB 191004B: Swift detection of a burst with an optical counterpart
  2. LIGO/Virgo S190930t: AT2019rpn, AT2019rpj CrAO continued optical photometry
  3. IceCube-191001A: HAWC follow-up
  4. LIGO/Virgo S190930t: AT2019rpn, AT2019rpj CrAO optical photometry
  5. LIGO/Virgo S190930t: Candidates from ATLAS observations and constraints on AT2019rpr and AT2019rpn
  6. LIGO/Virgo S190930s: No counterpart candidates in KAIT observations
  7. Fermi trigger No 591604915: Global MASTER-Net observations report
  8. LIGO/Virgo S190930t : no neutrino counterpart candidate in ANTARES search
  9. LIGO/Virgo S190930s : no neutrino counterpart candidate in ANTARES search
  10. LIGO/Virgo S190930s: Coverage and upper limits from MAXI/GSC observations
  11. LIGO/Virgo S190930t: Global MASTER-Net observations report
  12. GRB 190928A: MASTER optical observations
  13. IPN triangulation of GRB 190928A (long/bright)
  14. LIGO/Virgo S190923y: No significant candidates in TAROT-GRANDMA observations
  15. Fermi-LAT Gamma-ray Observations of IceCube-190922B
  16. LIGO/Virgo S190924h : no neutrino counterpart candidate in ANTARES search
  17. IceCube-190922B: Upper limits from a search for additional neutrino events in IceCube
  18. LIGO/Virgo S190924h: Global MASTER-Net observations report
  19. IceCube-190922B - HAWC follow-up
  20. IceCube-190922B: Identification of a Candidate Supernova from the Zwicky Transient Facility
  21. LIGO/Virgo S190923y : no neutrino counterpart candidate in ANTARES search
  22. IceCube-190922B: INTEGRAL was inactive at the time of the event
  23. IceCube-190922B - IceCube observation of a high-energy neutrino candidate event
  24. LIGO/Virgo S190915ak: No significant candidates in TAROT-GRANDMA observations
  25. LIGO/Virgo S190910h: No significant candidates in TAROT-GRANDMA observations
  26. HAWC-190916A: DDOTI Optical Observations
  27. LIGO/Virgo S190915ak : no neutrino counterpart candidate in ANTARES search
  28. LIGO/Virgo S190910d : No significant candidates in TAROT-GRANDMA observations
  29. LIGO/Virgo S190910d: No Counterparts in DDOTI/OAN Optical Observations
  30. GRB 190913A: Fermi GBM Final Real-time Localization
  31. LIGO/Virgo S190910d and S190910h: No counterpart candidates in KAIT observations
  32. LIGO/Virgo S190910h : no neutrino counterpart candidate in ANTARES search
  33. LIGO/Virgo S190910d : no neutrino counterpart candidate in ANTARES search
  34. ZTF19abvizsw: No counterpart candidates from Swift/BAT targeted search
  35. LIGO/Virgo S190814bv: VLA/JAGWAR monitoring of the 50% containment region
  36. LIGO/Virgo S190901ap: Gaia Photometric Alerts transient candidates
  37. LIGO/Virgo S190901ap : No significant candidates found in GRANDMA citizen science observations
  38. ZTF19abvizsw/AT2019pim, search for GRB in SPI-ACS/INTEGRAL data
  39. ZTF19abvizsw: AbAO and CrAO photometry
  40. GRB 190829A: GTC confirmation of an associated Type Ic-BL Supernova
  41. LIGO/Virgo S190901ap: Second Epoch Hobby-Eberly Telescope observations of ZTF19abvionh
  42. Fermi trigger No 589419513 Global MASTER-Net observations report
  43. LIGO/Virgo S190814bv: GRAWITA VST-ESO PARANAL observations and independent transient candidates discovery.
  44. LIGO/Virgo S190901ap : No significant candidates in TAROT-GRANDMA
  45. LIGO/Virgo S190901ap: No counterpart candidates in KAIT observations
  46. Swift XRT Detection of X-ray Emission from ZTF19abvizsw
  47. LIGO/Virgo S190901ap: no counterpart candidate in the SVOM/GWAC observations
  48. Liverpool Telescope observations of ZTF19abvizsw, a candidate untriggered GRB afterglow
  49. Fermi trigger No 589223981 Global MASTER-Net observations report
  50. LIGO/Virgo S190901ap: Additional observations from the Zwicky Transient Facility
  51. LIGO/Virgo S190828l: no counterpart candidate in the SVOM/GWAC observations
  52. LIGO/Virgo S190828j: no counterpart candidate in the SVOM/GWAC observations
  53. GRB 190829A: Flattening of optical light curve from continued Liverpool Telescope photometry
  54. LIGO/Virgo S190901ap: Candidates from the Zwicky Transient Facility
  55. LIGO/Virgo S190901ap : no neutrino counterpart candidate in ANTARES search
  56. LIGO/Virgo S190901ap Global MASTER-Net observations report
  57. GRB 190829A: Keck LRIS spectroscopy of the optical afterglow
  58. LIGO/Virgo S190828j : No significant candidates in TAROT-GRANDMA observations
  59. LIGO/Virgo S190828l: No significant candidates in TAROT-GRANDMA observations
  60. GRB 190829A: TNG imaging of the NIR afterglow
  61. GRB 190829A: Liverpool Telescope optical photometry
  62. GRB 190829A:: Global MASTER-net optical clear and polarization observations scheduler and some spiculations
  63. GRB 190829A: 10.4m GTC spectroscopy
  64. GRB 190829A: NOT optical afterglow detection and spectroscopy
  65. LIGO/Virgo S190828l: No counterpart candidates in KAIT observations
  66. GRB 190829A: Dabancheng-0.5m optical afterglow detection
  67. GRB 190829A: Swift detection of a burst consistent with a galaxy at z=0.08
  68. GRB 190828B: VLT/X-shooter optical afterglow candidate
  69. LIGO/Virgo S190828j: No counterpart candidates in KAIT observations
  70. LIGO/Virgo S190828l: Upper limits from IceCube neutrino searches
  71. LIGO/Virgo S190828j : no neutrino counterpart candidate in ANTARES search
  72. LIGO/Virgo S190828l : no neutrino counterpart candidate in ANTARES search
  73. GRB 190828A: MAXI/GSC detection
  74. Fermi trigger No 588597173 Global MASTER-Net observations report
  75. LIGO/Virgo S190814bv: MASTER prediscovery and postdiscovery observations DECam candidate DG19wxnjc/AT2019npv field
  76. Fermi trigger No 588185734 Global MASTER-Net observations report
  77. LIGO/Virgo S190814bv: No radio counterpart detected in ASKAP observations
  78. LIGO/Virgo S190814bv: No Optical Counterpart Candidates in Second-Epoch Lick/KAIT Observations
  79. GRB 190821A: Swift detection of a burst
  80. Fermi GBM-190816: ZTF19abqanpy 10.4m GTC spectroscopy
  81. LIGO/Virgo S190814bv: AT2019nqq 10.4m GTC spectroscopy
  82. LIGO/Virgo S190814bv: Further Pan-STARRS observations and transient sources
  83. LIGO/Virgo S190814bv: RATIR Optical observations of DECam transients
  84. Fermi GBM-190816+LIGO/Virgo : no neutrino counterpart candidate in ANTARES search
  85. LIGO/Virgo S190814bv: GRAWITA TNG NIR imaging of AT2019nqq and AT2019nqc
  86. LIGO/Virgo S190814bv: GRAWITA TNG infrared imaging of desgw-190814e, DG19sevhc and selected galaxies
  87. LIGO/Virgo S190814bv : No Counterpart Candidates in Continued Galaxy Targeted Search with Magellan
  88. Baksan Neutrino Observatory Alert 190816.83 Global MASTER-Net observations report
  89. LIGO/Virgo S190814bv: No candidates from DCT galaxy targeted search and observations of DECam-GROWTH candidates
  90. S190814bv: MASTER analysis of DECam-GROWTH candidates
  91. LIGO/Virgo S190814bv : No Counterpart Candidates in Galaxy Targeted Search with Magellan
  92. LIGO/Virgo S190814bv: No counterpart candidates in KAIT observations
  93. LIGO/Virgo S190814bv: KMTNet observation
  94. LIGO/Virgo S190814bv Global MASTER-Net optical observations
  95. LIGO/Virgo S190814bv: no candidates from WHT imaging of candidate galaxies
  96. LIGO/Virgo S190814bv: Nordic Optical Telescope imaging of selected galaxies
  97. LIGO/Virgo S190814bv Global MASTER-Net observations report
  98. Fermi trigger No 587084236 Global MASTER-Net observations report
  99. GRB 190808B: BALROG localization (Fermi Trigger 586980202 / GRB 190808752)
  100. GRB 190808B: Fermi GBM Final Real-time Localization

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