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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"

6667 results found.

  1. GRB 111211A: Swift/UVOT Detection
  2. GRB 111212A: Swift-XRT refined Analysis
  3. GRB 111211A: Swift/XRT target of opportunity observation
  4. GRB 111210A: Swift-XRT refined Analysis
  5. GRB 111208A: Swift-XRT refined analysis
  6. GRB 111208A: Lightbuckets Optical Observations
  7. GRB 111209A: Swift-XRT refined Analysis
  8. GRB 111209A: Swift UVOT refined analysis
  9. GRB 111209A: Swift Burst of Interest
  10. GRB111209A : planned XMM-Newton observation
  11. GRB 111208A: Swift XRT/UVOT observations
  12. GRB 111205A: Swift XRT Observations
  13. GRB 111204A: TNG NIR observations
  14. GRB 111204A: Swift-XRT refined Analysis
  15. GRB 110921A: optical observations in Maidanak observatory
  16. GRB 111201A: Confirmation of the X-ray afterglow
  17. GRB111201A: Swift-XRT observations
  18. GRB 111129A: Swift-XRT refined Analysis
  19. GRB 111123A, Swift-BAT refined analysis
  20. GRB 111123A: Swift-XRT refined Analysis
  21. GRB 111121A: Swift-XRT refined Analysis
  22. GRB 111117A: Fermi GBM observation
  23. GRB 111117A: Swift-XRT refined Analysis
  24. GRB 111117A: NOT observations
  25. GRB111107A: ATCA observations - upper limit and a possible detection
  26. GRB 111109A: Swift-XRT refined Analysis
  27. GRB 111107A: Fermi GBM observation
  28. GRB 111107A: Swift-XRT refined Analysis
  29. GRB 111103B : WIYN 3.5m NIR observations
  30. GRB 111103B: Swift-XRT refined Analysis
  31. GRB 111103A: Fermi GBM observation
  32. GRB 111029A: SAO RAS optical limits
  33. GRB 111029A: Swift-XRT refined Analysis
  34. GRB 111029A: PAIRITEL NIR Upper Limits
  35. GRB 111022B: Swift-XRT refined Analysis
  36. GRB 111022A: Swift-XRT refined Analysis
  37. GRB 111022B: NOT observations
  38. GRB 111020A: Swift-XRT refined Analysis
  39. GRB 111018A: Swift-XRT refined Analysis
  40. GRB111016A : WIYN 3.5m NIR observations
  41. GRB 111017A: Fermi GBM Detection
  42. GRB 111016A: Swift-XRT refined Analysis
  43. GRB 111008A : miniTAO/ANIR NIR observations
  44. GRB 111008A: Swift-XRT refined Analysis
  45. GRB 111005A : miniTAO/ANIR NIR observations
  46. GRB 111005A: GROND NIR observations
  47. GRB 111003A: Fermi GBM detection
  48. GRB 110928A: Swift-XRT refined Analysis
  49. GRB 110928A: Further PAIRITEL NIR Observations
  50. GRB 110928A: PAIRITEL NIR Observations
  51. GCN for GRB 110921B
  52. GRB 110921A: NOT observations
  53. GRB 110921A: Fermi GBM observation
  54. GRB 110921A: Swift-XRT refined Analysis
  55. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  56. GRB 110918A: Swift-XRT refined Analysis
  57. GRB 110915B : X-ray afterglow confirmation
  58. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  59. GRB 110918A: rest-frame energetics in gamma-gays
  60. GRB 110918A: Swift-XRT observations
  61. Konus-Wind observation of GRB 110918A
  62. GRB 110915A: Swift/UVOT Upper Limits
  63. GRB 110915A: GROND Upper limits
  64. GRB 110915A: Swift-XRT refined Analysis
  65. GRB 110915A: Deep Near-IR Limits from Magellan
  66. GRB 110915B: XRT afterglow candidate
  67. GRB 110915A: NOT observations
  68. GRB 110903A: Fermi GBM observation
  69. GRB 110903A: Swift/UVOT Upper Limits
  70. GRB 110903A: Swift-XRT observations
  71. GRB 110903A: a long GRB detected by INTEGRAL
  72. Trigger 502024: Swift detection of KS 1741-293
  73. GRB110825A: Fermi GBM observation
  74. GRB110825A: Swift target of opportunity observation
  75. Swift-BAT Trigger 501485 is noise
  76. Swift J1834.9-0846: Precise X-ray Position and the Confirmation of its Spin Period
  77. GRB 110820A: CQUEAN izY Observation
  78. GRB 110820A: Swift-XRT refined Analysis
  79. GRB 110818A: Fermi GBM observation
  80. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  81. GRB 110818A: Swift-XRT refined Analysis
  82. GRB 110815A: Swift-XRT and UVOT refined Analysis
  83. GRB 110815A : Suzaku WAM observation of the prompt emission
  84. Konus-Wind observation of GRB 110815A
  85. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  86. GRB 110808A: Swift-XRT refined Analysis
  87. GRB 110726A: two epochs of SAO RAS optical observations
  88. GRB 110726A: Swift-XRT refined Analysis
  89. GRB 110801A: Swift-XRT refined Analysis
  90. GRB 110731A: Swift-XRT refined Analysis
  91. GRB 110731A: Fermi GBM observation
  92. Fermi-LAT Detection of GRB110731A
  93. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  94. GRB 110721A: Swift observations of afterglow candidate
  95. GRB 110721A: Fermi-LAT detection
  96. GRB 110721A: Fermi GBM detection
  97. GRB 110719A: Swift-XRT refined Analysis
  98. Swift J1822.3-1606
  99. GRB 110715A: Swift-XRT refined Analysis
  100. Swift trigger 457076 is not a GRB

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