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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"

3044 results found.

  1. LIGO/Virgo S190828j : No significant candidates in TAROT-GRANDMA observations
  2. LIGO/Virgo S190828l: No significant candidates in TAROT-GRANDMA observations
  3. GRB 190829A: NOEMA detection of the mm afterglow
  4. GRB 190831A: Fermi GBM Final Real-time Localization
  5. GRB 190829A, Swift-BAT refined analysis
  6. GRB 190829A:: Global MASTER-net optical clear and polarization observations scheduler and some spiculations
  7. GRB 190829A: GROND detection of the Optical/NIR Afterglow
  8. GRB 190829A: Enhanced Swift-XRT position
  9. LIGO/Virgo S190828j: No Counterparts in DDOTI/OAN Optical Observations
  10. LIGO/Virgo S190828l: No counterpart candidates in KAIT observations
  11. GRB 190829A: Dabancheng-0.5m optical afterglow detection
  12. GRB 190829A: Swift detection of a burst consistent with a galaxy at z=0.08
  13. LIGO/Virgo S190828j: No counterpart candidates in KAIT observations
  14. GRB 190828A: MAXI/GSC detection
  15. LIGO/Virgo S190814bv: MASTER prediscovery and postdiscovery observations DECam candidate DG19wxnjc/AT2019npv field
  16. Fermi trigger No 588350802 Global MASTER-Net observations report
  17. GRB 190823A: MAXI/GSC detection
  18. Fermi trigger No 588185734 Global MASTER-Net observations report
  19. Fermi GBM-190816: MASTER-Net optical observation report
  20. LIGO/Virgo S190814bv: No radio counterpart detected in ASKAP observations
  21. LIGO/Virgo S190814bv: No Optical Counterpart Candidates in Second-Epoch Lick/KAIT Observations
  22. LIGO/Virgo S190814bv: RATIR Optical observations of DECam transients
  23. LIGO/Virgo S190814bv : No Counterpart Candidates in Continued Galaxy Targeted Search with Magellan
  24. LIGO/Virgo S190814bv: No candidates from DCT galaxy targeted search and observations of DECam-GROWTH candidates
  25. LIGO/Virgo S190814bv : No Counterpart Candidates in Galaxy Targeted Search with Magellan
  26. Fermi trigger No 587505927 Global MASTER-Net observations report
  27. LIGO/Virgo S190814bv: No counterpart candidates in KAIT observations
  28. LIGO/Virgo S190814bv Global MASTER-Net optical observations
  29. LIGO/Virgo S190814bv: Nordic Optical Telescope imaging of selected galaxies
  30. Fermi trigger No 587392154 Global MASTER-Net observations report
  31. LIGO/Virgo S190808ae: Identification of a GW compact binary merger candidate
  32. Fermi trigger No 586676451 Global MASTER-Net observations report
  33. GRB 190805B: MAXI/GSC detection
  34. GRB 190804B: MAXI/GSC detection
  35. Fermi trigger No 586574612 Global MASTER-Net observations report
  36. IPN Triangulation of GRB 190731A
  37. LIGO/Virgo S190728q: No counterpart candidates in KAIT observations
  38. LIGO/Virgo S190728q: no counterpart candidates in AGILE-GRID observations
  39. LIGO/Virgo S190728q Global MASTER-Net observations report
  40. LIGO/Virgo S190727h: No counterpart candidates in KAIT observations
  41. Fermi trigger No 585864875 Global MASTER-Net observations report
  42. Fermi trigger No 585856427 Global MASTER-Net observations report
  43. LIGO/Virgo S190720a: Thacher Observatory follow-up observations
  44. IPN triangulation of GRB 190724A (short)
  45. LIGO/Virgo S190720a: No counterpart candidates in KAIT observations
  46. LIGO/Virgo S190720a: Upper limits from Fermi-GBM Observations
  47. LIGO/Virgo S190718y: No counterpart candidates in CNEOST
  48. LIGO/Virgo S190718y: No counterpart candidates in KAIT observations
  49. Swift GRB190718.2 Global MASTER-Net observations report
  50. Fermi trigger No 585007213 Global MASTER-Net observations report
  51. Fermi trigger No 584929684 Global MASTER-Net observations report
  52. GRB 190714A: MAXI/GSC detection
  53. Fermi trigger No 584637077 Global MASTER-Net observations report
  54. LIGO/Virgo S190706ai: Upper limits from Insight-HXMT/HE observations
  55. MAXI GRB190708.83 Global MASTER-Net observations report
  56. LIGO/Virgo S190706ai: No counterpart candidates in KAIT observations
  57. GRB 190706A: MAXI/GSC detection
  58. Fermi trigger No 584007338 Global MASTER-Net observations report
  59. LIGO/Virgo S190630ag: no counterpart candidate in the SVOM/GWAC observations
  60. GRB 190630C: Swift-BAT refined analysis
  61. GRB 190701A: MAXI/GSC detection
  62. Fermi trigger No 583567803 Global MASTER-Net observations report
  63. GRB 190627A: Koshka Zeiss-1000 optical counterpart observations
  64. Fermi trigger No 583327924 Global MASTER-Net observations report
  65. Fermi trigger No 582856902 Global MASTER-Net observations report
  66. Fermi trigger No 582759998 Global MASTER-Net observations report
  67. Fermi trigger No 582615488 Global MASTER-Net observations report
  68. Fermi trigger No 582115625 Global MASTER-Net observations report
  69. IPN Triangulation of GRB 190611B
  70. GRB 190612A: Fermi GBM Final Real-time Localization
  71. Fermi trigger No 581889628 Global MASTER-Net observations report
  72. GRB 190610A: Swift detection of a short burst
  73. Fermi trigger No 581645543 Global MASTER-Net observations report
  74. IPN Triangulation of GRB 190606A (short)
  75. GRB 190604B: BOOTES-3 early optical limits
  76. GRB 190604B: Swift detection of a burst
  77. LIGO/Virgo S190602aq: No counterpart candidates in HAWC observations
  78. GRB 190530A: Mondy and AbAO optical observations
  79. GRB 190531B: VLT optical upper limit
  80. GRB 190531B: MASTER optical observation
  81. GRB 190531B: Swift-XRT afterglow detection
  82. LIGO/Virgo S190425z: No counterpart candidate in Zadko-GRANDMA observations.
  83. LIGO/Virgo S190521r : Gaia Photometric Alerts transient candidate
  84. LIGO/Virgo S190521r: CNEOST follow-up observations
  85. Fermi GRB190525.67 Global MASTER-Net observations report
  86. Fermi GRB190525.03 Global MASTER-Net observations report
  87. LIGO/Virgo S190521r: No optical counterpart from SVOM/GWAC-F30 observations.
  88. LIGO/Virgo S190521g: No optical counterpart from SVOM/GWAC observations.
  89. LIGO/Virgo S190519bj Global MASTER-Net observations report
  90. GRB 190519A: Swift-BAT refined analysis
  91. GRB 190519A: Fermi GBM Final Real-time Localization
  92. Fermi GRB190517.81 Global MASTER-Net observations report
  93. LIGO/Virgo S190517h Global MASTER-Net observations report
  94. LIGO/Virgo S190513bm: Swope follow-up observations
  95. LIGO/Virgo S190513bm: Lick/KAIT Follow-Up Observations
  96. Konus-Wind observation of GRB 190511A
  97. LIGO/Virgo S190510g: Further KMTNet observation of DECam-GROWTH and DESGW candidates
  98. LIGO/Virgo S190512at Global MASTER-Net observations report
  99. Fermi GRB190512.61 Global MASTER-Net observations report
  100. LIGO/Virgo S190510g: DOAO Observation

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