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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

6797 results found.

  1. GRB 120102A: Swift-XRT refined Analysis
  2. GRB 111228A, optical observations
  3. GRB 111228A: correction for GCN 12787
  4. GRB 111228A: Optical and NIR observations with Kanata telescope
  5. GRB 111229A: Swift/UVOT Detection
  6. GRB 111229A: Swift-XRT refined Analysis
  7. GRB 111225A: Lightbuckets Optical Observations
  8. GRB 111228A: T100 observations
  9. GRB 111228A: Swift-XRT refined Analysis
  10. GRB 111228A: PAIRITEL NIR Detection
  11. GRB 111228A, optical observations
  12. GRB 111228A: Fermi GBM observation
  13. GRB 111225A, optical observations
  14. XMM-Newton observation of the short GRB 111020A
  15. GRB 111205A: optical observations
  16. GRB 111225A: PAIRITEL NIR Upper Limits
  17. GRB 111225A: GRT Optical Observation
  18. GRB 111225A: Swift-XRT refined Analysis
  19. GRB 111225A: Super-LOTIS early detection
  20. GRB 111222A: Xinglong TNT observation
  21. GRB 111222A: Swift/UVOT Observations
  22. GRB 111222A: Swift-XRT observations
  23. Konus-Wind observation of GRB 111222A
  24. GRB 110820A: optical observations in Maidanak observatory
  25. GRB 111215B: Swift-XRT observations
  26. GRB 111205A: Confirmation of X-ray Afterglow
  27. GRB 111215A: TNG K-band observations
  28. GRB 111215A: Swift-XRT refined Analysis
  29. GRB 111215A: Swift-BAT refined analysis
  30. GRB 111215A, Optical Observations
  31. GRB 111211A: Swift/UVOT Detection
  32. GRB 111212A: Swift-XRT refined Analysis
  33. GRB 111211A: Swift/XRT target of opportunity observation
  34. GRB 111210A: Swift-XRT refined Analysis
  35. GRB 111208A: Swift-XRT refined analysis
  36. GRB 111208A: Lightbuckets Optical Observations
  37. GRB 111209A: Swift-XRT refined Analysis
  38. GRB 111209A: Swift UVOT refined analysis
  39. GRB 111209A: Swift Burst of Interest
  40. GRB111209A : planned XMM-Newton observation
  41. GRB 111208A: Swift XRT/UVOT observations
  42. GRB 111205A: Swift XRT Observations
  43. GRB 111204A: TNG NIR observations
  44. GRB 111204A: Swift-XRT refined Analysis
  45. GRB 110921A: optical observations in Maidanak observatory
  46. GRB 111201A: Confirmation of the X-ray afterglow
  47. GRB111201A: Swift-XRT observations
  48. GRB 111129A: Swift-XRT refined Analysis
  49. GRB 111123A, Swift-BAT refined analysis
  50. GRB 111123A: Swift-XRT refined Analysis
  51. GRB 111121A: Swift-XRT refined Analysis
  52. GRB 111117A: Fermi GBM observation
  53. GRB 111117A: Swift-XRT refined Analysis
  54. GRB 111117A: NOT observations
  55. GRB111107A: ATCA observations - upper limit and a possible detection
  56. GRB 111109A: Swift-XRT refined Analysis
  57. GRB 111107A: Fermi GBM observation
  58. GRB 111107A: Swift-XRT refined Analysis
  59. GRB 111103B : WIYN 3.5m NIR observations
  60. GRB 111103B: Swift-XRT refined Analysis
  61. GRB 111103A: Fermi GBM observation
  62. GRB 111029A: SAO RAS optical limits
  63. GRB 111029A: Swift-XRT refined Analysis
  64. GRB 111029A: PAIRITEL NIR Upper Limits
  65. GRB 111022B: Swift-XRT refined Analysis
  66. GRB 111022A: Swift-XRT refined Analysis
  67. GRB 111022B: NOT observations
  68. GRB 111020A: Swift-XRT refined Analysis
  69. GRB 111018A: Swift-XRT refined Analysis
  70. GRB111016A : WIYN 3.5m NIR observations
  71. GRB 111017A: Fermi GBM Detection
  72. GRB 111016A: Swift-XRT refined Analysis
  73. GRB 111008A : miniTAO/ANIR NIR observations
  74. GRB 111008A: Swift-XRT refined Analysis
  75. GRB 111005A : miniTAO/ANIR NIR observations
  76. GRB 111005A: GROND NIR observations
  77. GRB 111003A: Fermi GBM detection
  78. GRB 110928A: Swift-XRT refined Analysis
  79. GRB 110928A: Further PAIRITEL NIR Observations
  80. GRB 110928A: PAIRITEL NIR Observations
  81. GCN for GRB 110921B
  82. GRB 110921A: NOT observations
  83. GRB 110921A: Fermi GBM observation
  84. GRB 110921A: Swift-XRT refined Analysis
  85. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  86. GRB 110918A: Swift-XRT refined Analysis
  87. GRB 110915B : X-ray afterglow confirmation
  88. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  89. GRB 110918A: rest-frame energetics in gamma-gays
  90. GRB 110918A: Swift-XRT observations
  91. Konus-Wind observation of GRB 110918A
  92. GRB 110915A: Swift/UVOT Upper Limits
  93. GRB 110915A: GROND Upper limits
  94. GRB 110915A: Swift-XRT refined Analysis
  95. GRB 110915A: Deep Near-IR Limits from Magellan
  96. GRB 110915B: XRT afterglow candidate
  97. GRB 110915A: NOT observations
  98. GRB 110903A: Fermi GBM observation
  99. GRB 110903A: Swift/UVOT Upper Limits
  100. GRB 110903A: Swift-XRT observations

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