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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"

6190 results found.

  1. GRB 111228A: T100 observations
  2. GRB 111228A: Swift-XRT refined Analysis
  3. GRB 111228A: PAIRITEL NIR Detection
  4. GRB 111228A, optical observations
  5. GRB 111228A: Fermi GBM observation
  6. GRB 111225A, optical observations
  7. XMM-Newton observation of the short GRB 111020A
  8. GRB 111205A: optical observations
  9. GRB 111225A: PAIRITEL NIR Upper Limits
  10. GRB 111225A: GRT Optical Observation
  11. GRB 111225A: Swift-XRT refined Analysis
  12. GRB 111225A: Super-LOTIS early detection
  13. GRB 111222A: Xinglong TNT observation
  14. GRB 111222A: Swift/UVOT Observations
  15. GRB 111222A: Swift-XRT observations
  16. Konus-Wind observation of GRB 111222A
  17. GRB 110820A: optical observations in Maidanak observatory
  18. GRB 111215B: Swift-XRT observations
  19. GRB 111205A: Confirmation of X-ray Afterglow
  20. GRB 111215A: TNG K-band observations
  21. GRB 111215A: Swift-XRT refined Analysis
  22. GRB 111215A: Swift-BAT refined analysis
  23. GRB 111215A, Optical Observations
  24. GRB 111211A: Swift/UVOT Detection
  25. GRB 111212A: Swift-XRT refined Analysis
  26. GRB 111211A: Swift/XRT target of opportunity observation
  27. GRB 111210A: Swift-XRT refined Analysis
  28. GRB 111208A: Swift-XRT refined analysis
  29. GRB 111208A: Lightbuckets Optical Observations
  30. GRB 111209A: Swift-XRT refined Analysis
  31. GRB 111209A: Swift UVOT refined analysis
  32. GRB 111209A: Swift Burst of Interest
  33. GRB111209A : planned XMM-Newton observation
  34. GRB 111208A: Swift XRT/UVOT observations
  35. GRB 111205A: Swift XRT Observations
  36. GRB 111204A: TNG NIR observations
  37. GRB 111204A: Swift-XRT refined Analysis
  38. GRB 110921A: optical observations in Maidanak observatory
  39. GRB 111201A: Confirmation of the X-ray afterglow
  40. GRB111201A: Swift-XRT observations
  41. GRB 111129A: Swift-XRT refined Analysis
  42. GRB 111123A, Swift-BAT refined analysis
  43. GRB 111123A: Swift-XRT refined Analysis
  44. GRB 111121A: Swift-XRT refined Analysis
  45. GRB 111117A: Fermi GBM observation
  46. GRB 111117A: Swift-XRT refined Analysis
  47. GRB 111117A: NOT observations
  48. GRB111107A: ATCA observations - upper limit and a possible detection
  49. GRB 111109A: Swift-XRT refined Analysis
  50. GRB 111107A: Fermi GBM observation
  51. GRB 111107A: Swift-XRT refined Analysis
  52. GRB 111103B : WIYN 3.5m NIR observations
  53. GRB 111103B: Swift-XRT refined Analysis
  54. GRB 111103A: Fermi GBM observation
  55. GRB 111029A: SAO RAS optical limits
  56. GRB 111029A: Swift-XRT refined Analysis
  57. GRB 111029A: PAIRITEL NIR Upper Limits
  58. GRB 111022B: Swift-XRT refined Analysis
  59. GRB 111022A: Swift-XRT refined Analysis
  60. GRB 111022B: NOT observations
  61. GRB 111020A: Swift-XRT refined Analysis
  62. GRB 111018A: Swift-XRT refined Analysis
  63. GRB111016A : WIYN 3.5m NIR observations
  64. GRB 111017A: Fermi GBM Detection
  65. GRB 111016A: Swift-XRT refined Analysis
  66. GRB 111008A : miniTAO/ANIR NIR observations
  67. GRB 111008A: Swift-XRT refined Analysis
  68. GRB 111005A : miniTAO/ANIR NIR observations
  69. GRB 111005A: GROND NIR observations
  70. GRB 111003A: Fermi GBM detection
  71. GRB 110928A: Swift-XRT refined Analysis
  72. GRB 110928A: Further PAIRITEL NIR Observations
  73. GRB 110928A: PAIRITEL NIR Observations
  74. GCN for GRB 110921B
  75. GRB 110921A: NOT observations
  76. GRB 110921A: Fermi GBM observation
  77. GRB 110921A: Swift-XRT refined Analysis
  78. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  79. GRB 110918A: Swift-XRT refined Analysis
  80. GRB 110915B : X-ray afterglow confirmation
  81. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  82. GRB 110918A: rest-frame energetics in gamma-gays
  83. GRB 110918A: Swift-XRT observations
  84. Konus-Wind observation of GRB 110918A
  85. GRB 110915A: Swift/UVOT Upper Limits
  86. GRB 110915A: GROND Upper limits
  87. GRB 110915A: Swift-XRT refined Analysis
  88. GRB 110915A: Deep Near-IR Limits from Magellan
  89. GRB 110915B: XRT afterglow candidate
  90. GRB 110915A: NOT observations
  91. GRB 110903A: Fermi GBM observation
  92. GRB 110903A: Swift/UVOT Upper Limits
  93. GRB 110903A: Swift-XRT observations
  94. GRB 110903A: a long GRB detected by INTEGRAL
  95. Trigger 502024: Swift detection of KS 1741-293
  96. GRB110825A: Fermi GBM observation
  97. GRB110825A: Swift target of opportunity observation
  98. Swift-BAT Trigger 501485 is noise
  99. Swift J1834.9-0846: Precise X-ray Position and the Confirmation of its Spin Period
  100. GRB 110820A: CQUEAN izY Observation

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