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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"

27600 results found.

  1. GRB 160206A: Kiso/KWFC optical observations
  2. GRB 160203A: RATIR Upper Limits
  3. GRB 160206B: Fermi GBM detection
  4. LIGO/Virgo G211117: LOFAR follow-up
  5. Swift Trigger 672897 is probably not an astrophysical event
  6. GRB 151215A: TAROT Calern observatory very early optical detection
  7. GRB 160206A: Swift/UVOT observations
  8. GRB 160203A: Zadko observatory - Gingin optical detection
  9. GRB 160203A: Swift-BAT refined analysis
  10. GRB 160206A: GROND Observations
  11. GRB 160206B: iPTF P48 Observations and Optical Transient Candidates
  12. GRB 160203A: RATIR Optical Observations
  13. GRB 160131A: RATIR Optical Observations
  14. GRB 160203A: Skynet PROMPT-CTIO observations of the optical afterglow
  15. GRB 160203A: Swift-XRT refined Analysis
  16. GRB 160203A: Swift/UVOT Detection
  17. The bright GRB160203A: X-shooter spectroscopy and redshift
  18. GRB 160203A: LCOGT-Cerro Tololo optical afterglow confirmation
  19. GRB 160203A: GROND Afterglow Candidate
  20. GRB 160203A: Swift detection of a burst
  21. Fermi GBM trigger 475675010/160128498 is not a GRB
  22. Konus-Wind observation of GRB 160131A
  23. GRB 160131A Swift/UVOT Detection
  24. GRB 160131A: GROND Detection of the Optical/NIR Afterglow
  25. GRB 160131A: Bassano Bresciano Observatory optical observations
  26. GRB 160131A: Swift-XRT refined Analysis
  27. GRB 160131A: Swift-BAT refined analysis
  28. GRB 160131A: LCOGT-SSO optical observations
  29. GRB 160131A: RATIR Optical Observations
  30. GRB 160131A: LCOGT-FTN optical afterglow observations
  31. GRB160131.35 MASTER-Net OT detection
  32. GRB 160131A: Swift detection of a burst with an optical counterpart
  33. GRB 160127A: RATIR Optical Observations
  34. GRB 160127A: Swift/UVOT Detection
  35. GRB 160127A: Swift-BAT refined analysis
  36. GRB 160127A: Swift-XRT refined Analysis
  37. GRB 160123A: TAROT La Silla observatory optical observations
  38. GRB 160127A: RATIR Optical Observations
  39. GRB 160127A: TAROT La Silla observatory optical light curve
  40. GRB 160127A: Swift detection of a burst with an optical counterpart
  41. LIGO Virgo G211117: MWA Observations
  42. GRB 160123A: GROND Upper limits
  43. GRB 160121A: RATIR Optical Observations
  44. GRB 160118A CALET Gamma-Ray Burst Monitor detection
  45. GRB 160123A: Swift/UVOT Upper Limits
  46. GRB 160123A: Swift-XRT refined Analysis
  47. GRB 160123A: Swift-BAT refined analysis
  48. GRB 160123A: Swift detection of a burst
  49. GRB 160121A: RATIR Optical Observations
  50. GRB 160121A: Swift-XRT refined Analysis
  51. GRB 160121A: Swift/UVOT Upper Limits
  52. GRB 160121A: GROND Afterglow observations
  53. GRB 160121A: Swift-BAT refined analysis
  54. GRB 160121A: 1.8m MOA optical afterglow detection
  55. GRB 160117B: RATIR continued observations
  56. GRB 160117B: TNG spectroscopy and redshift confirmation
  57. GRB 160121A: MASTER-Amur observations
  58. GRB 160121A: Swift detection of a burst
  59. Konus-Wind observation of GRB 160119A
  60. GRB 160117A: Swift-XRT afterglow detection
  61. GRB 160117B: further RATIR observations
  62. GRB160119A: BOOTES-2/TELMA Early Upper Limits
  63. GRB 160119A: Swift/UVOT Upper Limits
  64. GRB 160119A: GROND optical/NIR afterglow observations
  65. GRB 160119A: RATIR Optical and NIR Observations
  66. GRB 160117B: RATIR Optical and NIR Observations
  67. GRB 160119A: Swift-BAT refined analysis
  68. GRB 160119A: Swift-XRT refined Analysis
  69. GRB 160119A: NOT and GTC afterglow candidate
  70. GRB 160117B: Early iTelescope observation
  71. GRB 160119A: Swift detection of a burst
  72. GRB 160117A: Swift/UVOT Upper Limits
  73. GRB 160117A: Swift-XRT observations
  74. GRB 160117B: GROND optical/NIR afterglow observations
  75. GRB 160117B: Swift-XRT refined Analysis
  76. GRB 160117A: Swift-BAT refined analysis
  77. GRB 160117B: Swift/UVOT Detection
  78. GRB 160117B: LCOGT-SSO optical observations
  79. GRB 160117B: MASTER-Amur OT observations
  80. GRB 160117B: Swift detection of a burst with optical counterpart
  81. GRB 160117A: Swift detection of a burst
  82. GRB 160106A: CALET Gamma-Ray Burst Monitor detection
  83. IPN Triangulation of GRB 160113A
  84. LIGO/Virgo G211117: Further Swift-XRT sources
  85. Konus-Wind observation of GRB 160104B
  86. IPN Triangulation of GRB 160111A (short/hard)
  87. GRB 151225A: Correction to the trigger time of GCN 18724
  88. GRB 160113A: Fermi GBM detection
  89. GRB 160113A: iPTF P48 Observations and Optical Transient Candidates
  90. GRB 160104A: Swift/UVOT Detection
  91. IPN Triangulation of GRB 151231A
  92. LIGO/Virgo G211117: Updated FAR estimate based on offline re-analysis
  93. IPN Triangulation of GRB 151229B (extremely intense/long)
  94. LIGO/Virgo G184098: Updated FAR estimate
  95. LIGO/Virgo G211117: Swift observations of PS15dpn
  96. LIGO/Virgo G211117: iPTF Observations of PS15dpn
  97. GRB 160107A: Fermi GBM observation
  98. IPN Triangulation of GRB 151225A (short/hard)
  99. LIGO/Virgo G211117: Further Swift-XRT sources
  100. GRB 160104A: Swift-XRT refined Analysis

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