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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"
  1. GRB 110213A: Enhanced Swift-XRT position
  2. GRB110212A: MITSuME Okayama optical upper limits
  3. GRB 110213A: KAIT observations
  4. GRB 110213A: GRAS011 optical observations
  5. GRB 110213A: Bok Telescope Redshift
  6. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  7. GRB 110213A: P60 Optical Afterglow Detection
  8. GRB 110213A: Swift detection of a burst with optical afterglow
  9. GRB 110212A: GRT Optical Observation
  10. GRB 110212A, Swift-BAT refined analysis
  11. GRB 110212A: SARA-N Optical Limits
  12. GRB110212A: BOOTES-2/TELMA optical limits
  13. GRB 110212A: ROTSE-III Optical Limits
  14. GRB 110212A: Swift detection of a burst
  15. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  16. Konus-Wind observation of GRB 110205A (correction to GCN 11659)
  17. GRB 110205A: detection of optical linear polarization from CAHA
  18. GRB 110207A: Suzaku WAM observation of the prompt emission
  19. GRB 110210A: optical upper limit
  20. GRB 110210A: Swift-XRT refined Analysis
  21. GRB 110205A: Swift/BAT and Suzaku/WAM joint spectral analysis
  22. GRB 110210A: Swift-BAT refined analysis
  23. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  24. GRB 110210A: Enhanced Swift-XRT position
  25. GRB 110201A: optical observations
  26. GRB 110210A: Swift detection of a burst
  27. GRB 110206A: Swift-XRT confirmation of the X-ray afterglow
  28. GRB 110208A: Magellan confirmation of the optical afterglow
  29. Fermi GBM detection of a burst from 1E 1841-045
  30. Swift/UVOT observations of GRB110208a
  31. GRB 110205A: Suzaku WAM observation of the prompt emission
  32. GRB 110208A: Potential afterglow from Magellan
  33. GRB 110207A: Swift-XRT observations
  34. GRB 110208A: Swift-XRT refined Analysis
  35. GRB 110208A: Enhanced Swift-XRT position
  36. GRB 110208A: Swift-BAT refined analysis
  37. GRB 110208A: Magellan optical observations
  38. GRB 110206A: SMARTS optical/IR afterglow decay
  39. GRB 110208A: Swift detection of a burst
  40. SGR-like outburst from the magnetar 1E 1841-04.5
  41. GRB 110205A: optical observations in Mondy observatory
  42. GRB 110207A: Fermi GBM observation
  43. GRB 110205A : HCT optical observations
  44. GRB 110206A: Decay of afterglow candidate
  45. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  46. GRB 110207A: TAROT Calern observatory optical observations
  47. GRB 110205A - Continued PAIRITEL NIR Observations
  48. GRB 110206A: GROND detection of afterglow candidate
  49. GRB 110207A: Swift-BAT refined analysis
  50. GRB 110205A: WSRT radio observation
  51. GRB 110206A: UVOT detection of afterglow candidate
  52. GRB110205A: CARMA 3mm Observations
  53. GRB 110207A: MASTER prompt and early optical observations
  54. Konus-Wind observation of GRB 110205A
  55. GRB 110207A: Swift detection of a burst
  56. GRB 110206A: Swift detection of a probable X-ray afterglow
  57. GRB 110206A: TAROT La Silla observatory optical observations
  58. GRB 110205A: Lightbuckets Optical Observations
  59. GRB 110206A: a long GRB detected by INTEGRAL
  60. GRB 110205A : Lulin optical observation
  61. GRB110205A: MITSuME Ishigakijima Optical Observation
  62. GRB110205A: MITSuME Okayama Optical Observation
  63. GRB110205A: SMA 1.3mm Observations
  64. GRB 110205A: Swift/UVOT Continuing Observations
  65. GRB 110205A: Lulin optical observations and temporal decay index
  66. Observations GRB 110205A
  67. GRB 110205A: Swift-BAT refined analysis
  68. GRB 110205A: Newcastle Observatory Optical Observations
  69. GRB 110205A: Swift-XRT refined Analysis
  70. GRB 110205A: LOAO B/R Observation
  71. GRB 101225A is likely at z~0
  72. GRB 110205A: optical flare confirmation
  73. GRB 110205A: NOT redshift confirmation
  74. GRB 110205A: Enhanced Swift-XRT position
  75. GRB 110205A: FAST Redshift
  76. GRB 110205A: GRAS005 optical observations
  77. GRB 110205A: PAIRITEL NIR Afterglow Detection
  78. GRB 110205A: Possible Lick/Kast redshift
  79. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  80. GRB 110205A: Liverpool Telescope Afterglow Confirmation
  81. GRB 110205A: TAROT Calern observatory detection of an optical flare
  82. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  83. GRB 110205A: TAROT Calern observatory optical detection
  84. GRB 110205A: Swift detection of a burst with an optical candidate
  85. GRB 110128A: Fermi GBM detection
  86. GRB 110201A: Swift-XRT refined Analysis
  87. GRB110201A: MITSuME Okayama optical upper limits
  88. Swift/UVOT observations of GRB110201A
  89. GRB 110201A: Swift-BAT refined analysis
  90. GRB 110201A: MASTER optical observations
  91. GRB 110201A: Swift detection of a burst
  92. GRB110112B: EVLA Observations
  93. GRB101224A: EVLA Observations
  94. GRB110112A: EVLA Observations
  95. GRB110128A: MITSuME Okayama optical upper limits
  96. GRB 110125A: Fermi GBM detection
  97. GRB 101112A: Maidanak and CrAO optical observations
  98. GRB110128A: TNG NIR observations
  99. GRB 110128A, Swift-BAT refined analysis
  100. GRB 110128A: TAROT-Calern refined analysis

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