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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28123 results found.

  1. GRB 100206A: Pre-explosion imaging and host candidate
  2. GRB 100206A: Swift detection of a short hard burst
  3. GRB100205A: CFHT z'-band observation
  4. GRB 100205A: Gemini-N + NIRI photometry
  5. GRB 100130B: Fermi GBM detection
  6. GRB 100113A: Fermi GBM detection
  7. GRB 100205A: Swift-BAT refined analysis
  8. GRB 100205A: Swift UVOT upper limits
  9. GRB 100205A: Swift XRT refined analysis
  10. GRB 100203A: Swift XRT and UVOT refined analyses
  11. GRB 100205A: Enhanced Swift-XRT position
  12. GRB 100205A Gemini-North IR afterglow candidate
  13. GRB 100205A: Gemini-South Observations
  14. GRB 100205A: Super-LOTIS early observations
  15. GRB 100131A: Suzaku WAM observation of the prompt emission
  16. GRB 100205A: NOT optical observations
  17. GRB 100205A: Swift detection of a burst
  18. Short X-ray Transient detected by MAXI/GSC
  19. GRB 100131A: Fermi GBM detection
  20. GRB 100119A: Suzaku WAM observation of the prompt emission
  21. GRB 100122A: Fermi GBM detection
  22. GRB 100122A: MASTER-Net optical observations
  23. GRB 100116A: Suzaku WAM observation of the prompt emission
  24. GRB 100115A: Swift-XRT refined analysis
  25. GRB 100119A: Swift-BAT refined analysis
  26. Swift/UVOT refined analysis of GRB100117A
  27. GRB 100117A: Swift-XRT refined analysis
  28. GRB 100117A: Gemini-North upper limit
  29. GRB 100117A: Magellan IMACS imaging
  30. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  31. GRB 100117A: Swift-BAT refined analysis
  32. GRB100117A: Possible afterglow from NOT observation
  33. GRB 100117A: Swift detection of a short hard burst
  34. GRB 100115A: Gemini-N photometry
  35. GRB 100115A: Enhanced Swift-XRT position
  36. GRB 100116A: Fermi LAT detection
  37. GRB 100115A: SARA Astrometry
  38. GRB 100116A: Fermi GBM detection
  39. GRB 100115A: SARA Afterglow Candidate
  40. GRB 100115A: Swift/UVOT Upper Limits
  41. GRB 100115A: Swift-XRT candidate afterglow
  42. GRB 100111A: PAIRITEL NIR Upper Limits
  43. GRB 100111A: Swift UVOT Refined Analysis
  44. GRB 100111A: Swift-BAT refined analysis
  45. GRB 100111A: Enhanced Swift-XRT position
  46. GRB100111A: Swift-XRT refined analysis
  47. GRB 100111A: Fermi GBM observation
  48. GRB 100111A: NOT optical observations
  49. GRB 100111A: Swift detection of a burst with an optical afterglow
  50. Swift/BAT Detects an Outburst from XTE J1901+014
  51. GRB 100103A: GROND Upper Limits
  52. GRB 100103A: Swift-XRT team refined analysis
  53. GRB 100103A - UVOT-enhanced XRT position
  54. GRB 100103A: Swift/XRT position
  55. GRB 100103A: a long GRB detected with INTEGRAL
  56. Swift Trigger 381591 is probably not a burst
  57. GRB 091231: GROND NIR observations
  58. Swift Trigger 381591: Uncatalogued UVOT Source
  59. GRB 091230: Swift/UVOT Observations
  60. Trigger 381591: Swift detection of a possible burst
  61. GRB 091230: Swift-XRT observation
  62. GRB 091230: GROND optical/NIR afterglow candidate
  63. Swift Trigger 381434 is not a GRB
  64. Trigger 381434: Swift detection of a possible burst
  65. GRB 091221: Skynet/PROMPT Detections
  66. GRB 091221: Fermi GBM Observation
  67. GRB 091117: Swift-XRT late time observations
  68. GRB 091221 Swift-BAT refined analysis
  69. GRB 091221: Swift/UVOT refined analysis
  70. GRB 091221: Swift-XRT refined analysis
  71. GRB 091221: Enhanced Swift-XRT position
  72. GRB 091221: UVOT Confirmation of an Optical Afterglow
  73. GRB 091221: ROTSE-III Detection of Optical Counterpart
  74. GRB 091221: Swift detection of a burst
  75. Swift trigger 379449 (possible GRB) is not a burst
  76. GRB 091215: Faulkes Telescope North observations
  77. Trigger 379449: Swift detection of a possible burst
  78. GRB 091208A: Suzaku WAM observation of the prompt emission
  79. GRB 091208A: GAO 150cm telescope Optical Observation
  80. GRB091208A: Swift/UVOT refined analysis
  81. GRB 091208B: optical observations
  82. GRB 091208B: GROND observations
  83. GRB 091208A: Swift-XRT observations
  84. GRB091208B: NOT optical observations
  85. GRB 091208B: Swift-XRT refined analysis
  86. GRB 091208B, Swift-BAT refined analysis
  87. GRB 091208A Swift-BAT refined analysis
  88. GRB 091208A, RIMOTS optical upper limits
  89. GRB 091208B: MITSuME Akeno Optical Observation
  90. GRB 091208B: Enhanced Swift-XRT position
  91. GRB 091208B: MITSuME Okayama Optical Observation
  92. GRB 091208B, RIMOTS optical upper limits
  93. GRB 091208B: Swift detection of a burst with an optical afterglow
  94. GRB 091208B: BOOTES-3 optical afterglow
  95. Short X-ray Transient, RIMOTS optical upper limits
  96. GRB 091123: Suzaku WAM observation of the prompt emission
  97. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  98. GRB 091109A: GROND confirmation of redshift z = 3.5
  99. GRB 091127, SMARTS optical/IR afterglow observations
  100. GRB091202: Swift-XRT refined analysis

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