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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"

6417 results found.

  1. GRB 120211A, optical observations
  2. GRB 120211A: Swift-XRT refined Analysis
  3. GRB 120211A: MITSuME Okayama Ks-band upper limit
  4. GRB 120211A: Swift detection of a burst
  5. GRB 120202A: Swift/XRT and UVOT observations
  6. GRB 120119A : LOAO Optical Observations
  7. GRB 120121A: Swift-XRT refined Analysis
  8. GRB 120119A: Swift-XRT refined Analysis
  9. GRB 120119A: Fermi GBM observation
  10. GRB 120118B: Swift-XRT refined Analysis
  11. GRB 120119A: PAIRITEL NIR Detection
  12. GRB 120118B: NOT observations
  13. GRB 120116A: Swift-XRT refined Analysis
  14. GRB 120116A: NOT observations
  15. GRB 120107A: Fermi GBM observation
  16. GRB 120106A: MITSuME Okayama Ks-band upper limit
  17. GRB 120106A: Swift-XRT refined Analysis
  18. GRB 111222A: Fermi GBM observations
  19. GRB 111222A: Second Swift observation
  20. GRB 120102A: Fermi GBM observation
  21. GRB 120102A: Swift-XRT refined Analysis
  22. GRB 111228A, optical observations
  23. GRB 111228A: correction for GCN 12787
  24. GRB 111228A: Optical and NIR observations with Kanata telescope
  25. GRB 111229A: Swift/UVOT Detection
  26. GRB 111229A: Swift-XRT refined Analysis
  27. GRB 111225A: Lightbuckets Optical Observations
  28. GRB 111228A: T100 observations
  29. GRB 111228A: Swift-XRT refined Analysis
  30. GRB 111228A: PAIRITEL NIR Detection
  31. GRB 111228A, optical observations
  32. GRB 111228A: Fermi GBM observation
  33. GRB 111225A, optical observations
  34. XMM-Newton observation of the short GRB 111020A
  35. GRB 111205A: optical observations
  36. GRB 111225A: PAIRITEL NIR Upper Limits
  37. GRB 111225A: GRT Optical Observation
  38. GRB 111225A: Swift-XRT refined Analysis
  39. GRB 111225A: Super-LOTIS early detection
  40. GRB 111222A: Xinglong TNT observation
  41. GRB 111222A: Swift/UVOT Observations
  42. GRB 111222A: Swift-XRT observations
  43. Konus-Wind observation of GRB 111222A
  44. GRB 110820A: optical observations in Maidanak observatory
  45. GRB 111215B: Swift-XRT observations
  46. GRB 111205A: Confirmation of X-ray Afterglow
  47. GRB 111215A: TNG K-band observations
  48. GRB 111215A: Swift-XRT refined Analysis
  49. GRB 111215A: Swift-BAT refined analysis
  50. GRB 111215A, Optical Observations
  51. GRB 111211A: Swift/UVOT Detection
  52. GRB 111212A: Swift-XRT refined Analysis
  53. GRB 111211A: Swift/XRT target of opportunity observation
  54. GRB 111210A: Swift-XRT refined Analysis
  55. GRB 111208A: Swift-XRT refined analysis
  56. GRB 111208A: Lightbuckets Optical Observations
  57. GRB 111209A: Swift-XRT refined Analysis
  58. GRB 111209A: Swift UVOT refined analysis
  59. GRB 111209A: Swift Burst of Interest
  60. GRB111209A : planned XMM-Newton observation
  61. GRB 111208A: Swift XRT/UVOT observations
  62. GRB 111205A: Swift XRT Observations
  63. GRB 111204A: TNG NIR observations
  64. GRB 111204A: Swift-XRT refined Analysis
  65. GRB 110921A: optical observations in Maidanak observatory
  66. GRB 111201A: Confirmation of the X-ray afterglow
  67. GRB111201A: Swift-XRT observations
  68. GRB 111129A: Swift-XRT refined Analysis
  69. GRB 111123A, Swift-BAT refined analysis
  70. GRB 111123A: Swift-XRT refined Analysis
  71. GRB 111121A: Swift-XRT refined Analysis
  72. GRB 111117A: Fermi GBM observation
  73. GRB 111117A: Swift-XRT refined Analysis
  74. GRB 111117A: NOT observations
  75. GRB111107A: ATCA observations - upper limit and a possible detection
  76. GRB 111109A: Swift-XRT refined Analysis
  77. GRB 111107A: Fermi GBM observation
  78. GRB 111107A: Swift-XRT refined Analysis
  79. GRB 111103B : WIYN 3.5m NIR observations
  80. GRB 111103B: Swift-XRT refined Analysis
  81. GRB 111103A: Fermi GBM observation
  82. GRB 111029A: SAO RAS optical limits
  83. GRB 111029A: Swift-XRT refined Analysis
  84. GRB 111029A: PAIRITEL NIR Upper Limits
  85. GRB 111022B: Swift-XRT refined Analysis
  86. GRB 111022A: Swift-XRT refined Analysis
  87. GRB 111022B: NOT observations
  88. GRB 111020A: Swift-XRT refined Analysis
  89. GRB 111018A: Swift-XRT refined Analysis
  90. GRB111016A : WIYN 3.5m NIR observations
  91. GRB 111017A: Fermi GBM Detection
  92. GRB 111016A: Swift-XRT refined Analysis
  93. GRB 111008A : miniTAO/ANIR NIR observations
  94. GRB 111008A: Swift-XRT refined Analysis
  95. GRB 111005A : miniTAO/ANIR NIR observations
  96. GRB 111005A: GROND NIR observations
  97. GRB 111003A: Fermi GBM detection
  98. GRB 110928A: Swift-XRT refined Analysis
  99. GRB 110928A: Further PAIRITEL NIR Observations
  100. GRB 110928A: PAIRITEL NIR Observations

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Download all Circulars as a .tar.gz archive:
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