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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"

28092 results found.

  1. GRB 110305A: Swift/UVOT Upper Limits
  2. GRB 110305A: Swift-XRT refined Analysis
  3. GRB 110305A: Enhanced Swift-XRT position
  4. GRB 110305A: Swift-BAT refined analysis
  5. GRB 110305A: GROND Detection of Optical Afterglow
  6. GRB 110305A: Swift detection of a burst
  7. GRB 110223A: optical upper limits
  8. GRB 110301A: Fermi GBM detection
  9. Swift/UVOT observations of GRB110223A
  10. No IPN GRB detected in conjunction with candidate GRB 110215
  11. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  12. Swift/UVOT observations of GRB110223b
  13. GRB 110223A: Swift-BAT refined analysis
  14. GRB 110223A : early optical limit by "Pi of the Sky"
  15. GRB 110223A: Liverpool Telescope observations
  16. GRB 110223A: Swift-XRT refined Analysis
  17. GRB 110223B: Swift-XRT refined Analysis
  18. GRB 110223A: Enhanced Swift-XRT position
  19. GRB 110223B: Enhanced Swift-XRT position
  20. GRB 110223B: Swift-BAT refined analysis
  21. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  22. GRB 110223B: Swift detection of a burst
  23. GRB 110223A: Swift detection of a burst
  24. GRB 101225A, the review of the sky area in plate archives
  25. OT 110215: Further NIR observations from NOT of the GRB candidate
  26. GRB 110213B: Swift/UVOT observations
  27. Fermi GBM detection of an SGR-like burst
  28. Swift XRT and UVOT Observations of OT 110215
  29. OT 110215: NIR observations from NOT of GRB candidate
  30. GRB 110213A: optical observations in CrAO
  31. GRB 110213B: GROND observations of the optical/NIR afterglow
  32. OT 110215: possible GRB from 2MASS J00264184+8324093
  33. Swift/UVOT observations of GRB110210a.
  34. GRB 110210A: optical upper limit
  35. GRB 110210A: ROVOR Upper Limit
  36. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  37. GRB 110212A: Swift XRT and UVOT observations
  38. GRB 110205A: Konkoly optical observations
  39. GRB 110213B: Swift XRT observation
  40. GRB 110213A: MITSuME Akeno Optical Observation
  41. Konus-Wind observation of GRB 110213B
  42. GRB 110213A: Swift-XRT refined Analysis
  43. GRB110213A: MITSuME Okayama Optical Observation
  44. GRB 110213A: Swift/UVOT refined analysis
  45. GRB 110213A, Swift-BAT refined analysis
  46. GRB 110213A: optical observations
  47. GRB 110213A: Enhanced Swift-XRT position
  48. GRB110212A: MITSuME Okayama optical upper limits
  49. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  50. GRB 110213A: P60 Optical Afterglow Detection
  51. GRB 110213A: Swift detection of a burst with optical afterglow
  52. GRB 110212A: GRT Optical Observation
  53. GRB 110212A, Swift-BAT refined analysis
  54. GRB 110212A: SARA-N Optical Limits
  55. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  56. GRB 110205A: detection of optical linear polarization from CAHA
  57. GRB 110207A: Suzaku WAM observation of the prompt emission
  58. GRB 110210A: Swift-XRT refined Analysis
  59. GRB 110205A: Swift/BAT and Suzaku/WAM joint spectral analysis
  60. GRB 110210A: Swift-BAT refined analysis
  61. Swift-BAT refined analysis of outburst from 1E 1841-04.5
  62. GRB 110210A: Enhanced Swift-XRT position
  63. GRB 110201A: optical observations
  64. GRB 110210A: Swift detection of a burst
  65. Fermi GBM detection of a burst from 1E 1841-045
  66. Swift/UVOT observations of GRB110208a
  67. GRB 110205A: Suzaku WAM observation of the prompt emission
  68. GRB 110207A: Swift-XRT observations
  69. GRB 110208A: Swift-XRT refined Analysis
  70. GRB 110208A: Enhanced Swift-XRT position
  71. GRB 110208A: Swift-BAT refined analysis
  72. GRB 110208A: Swift detection of a burst
  73. GRB 110205A : HCT optical observations
  74. GRB 110206A: Decay of afterglow candidate
  75. GRB 110207A: TAROT Calern observatory optical observations
  76. GRB 110206A: GROND detection of afterglow candidate
  77. GRB 110207A: Swift-BAT refined analysis
  78. Konus-Wind observation of GRB 110205A
  79. GRB 110206A: Swift detection of a probable X-ray afterglow
  80. GRB 110206A: TAROT La Silla observatory optical observations
  81. GRB 110205A: Lightbuckets Optical Observations
  82. GRB 110206A: a long GRB detected by INTEGRAL
  83. GRB110205A: MITSuME Ishigakijima Optical Observation
  84. GRB110205A: MITSuME Okayama Optical Observation
  85. GRB 110205A: Swift/UVOT Continuing Observations
  86. Observations GRB 110205A
  87. GRB 110205A: Swift-BAT refined analysis
  88. GRB 110205A: Newcastle Observatory Optical Observations
  89. GRB 110205A: Swift-XRT refined Analysis
  90. GRB 110205A: LOAO B/R Observation
  91. GRB 110205A: optical flare confirmation
  92. GRB 110205A: NOT redshift confirmation
  93. GRB 110205A: Enhanced Swift-XRT position
  94. GRB 110205A: PAIRITEL NIR Afterglow Detection
  95. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  96. GRB 110205A: TAROT Calern observatory detection of an optical flare
  97. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  98. GRB 110205A: TAROT Calern observatory optical detection
  99. GRB 110205A: Swift detection of a burst with an optical candidate
  100. GRB 110128A: Fermi GBM detection

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