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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"

32716 results found.

  1. GRB 100205A: Super-LOTIS early observations
  2. GRB 100131A: Suzaku WAM observation of the prompt emission
  3. GRB 100205A: NOT optical observations
  4. Short X-ray Transient detected by MAXI/GSC
  5. GRB 100119A: Suzaku WAM observation of the prompt emission
  6. Konus-Wind observation of GRB 100119A
  7. GRB 100116A: Suzaku WAM observation of the prompt emission
  8. GRB 100115A: Swift-XRT refined analysis
  9. GRB 100119A: Swift-BAT refined analysis
  10. GRB091109A: VLT/FORS2 spectroscopic redshift
  11. GRB 100117A: candidate optical afterglow
  12. Konus-Wind observation of GRB 100116A
  13. GRB 100117A: Gemini North spectroscopy
  14. GRB 100117A: Fermi GBM detection
  15. Swift/UVOT refined analysis of GRB100117A
  16. GRB 100117A: Optical object inside the revised XRT error circle
  17. GRB 100117A: Swift-XRT refined analysis
  18. GRB 100117A: Gemini-North upper limit
  19. GRB 100117A: Magellan IMACS imaging
  20. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  21. GRB 100117A: Swift-BAT refined analysis
  22. GRB100117A: Possible afterglow from NOT observation
  23. GRB 100115A: Gemini-N photometry
  24. GRB 100115A: SARA Astrometry
  25. GRB100115A: Revision of NOT observation
  26. NOT observation of GRB100115A localization
  27. GRB 100115A: SARA Afterglow Candidate
  28. GRB 100115A: Swift/UVOT Upper Limits
  29. GRB 100115A: Swift-XRT candidate afterglow
  30. GRB 100111A: PAIRITEL NIR Upper Limits
  31. GRB 100111A: Swift UVOT Refined Analysis
  32. GRB 100111A: Swift-BAT refined analysis
  33. GRB100111A: Swift-XRT refined analysis
  34. GRB 100111A: Fermi GBM observation
  35. GRB 100111A: NOT optical observations
  36. Swift/BAT Detects an Outburst from XTE J1901+014
  37. Swift Trigger #382159 is due to XTE J1752-223
  38. GRB 100103A: GROND Upper Limits
  39. GRB 100103A: Swift-XRT team refined analysis
  40. Konus-Wind observation of GRB 100103A
  41. GRB 100103A: Swift/UVOT Upper Limits
  42. GRB 100103A: Correction to Swift position error
  43. GRB 100103A: Swift/XRT position
  44. Swift Trigger 381591: Retraction of Reported UVOT Source
  45. Swift Trigger 381591 is probably not a burst
  46. GRB 091231: GROND NIR observations
  47. Swift Trigger 381591: Uncatalogued UVOT Source
  48. GRB 091230: Swift/UVOT Observations
  49. GRB 091230: Swift-XRT observation
  50. GRB 091230: GROND optical/NIR afterglow candidate
  51. GRB 091221 : IRSF NIR upper limit
  52. GRB 091221: Skynet/PROMPT Detections
  53. GRB 091221: Fermi GBM Observation
  54. GRB 091117: Swift-XRT late time observations
  55. GRB 091221 Swift-BAT refined analysis
  56. GRB091221: Swift/UVOT refined analysis, correction.
  57. GRB 091221: Swift/UVOT refined analysis
  58. GRB 091221: Swift-XRT refined analysis
  59. GRB 091221, GROND observations
  60. GRB 091221: UVOT Confirmation of an Optical Afterglow
  61. GRB 091221: ROTSE-III Detection of Optical Counterpart
  62. Swift trigger 379449 (possible GRB) is not a burst
  63. GRB 091215: Faulkes Telescope North observations
  64. GRB 091208B: Xinglong TNT optical observation
  65. GRB 091208A: Suzaku WAM observation of the prompt emission
  66. GRB 091208A: GAO 150cm telescope Optical Observation
  67. Konus-Wind observation of GRB 091208A
  68. GRB 091208B: GAO 150cm telescope Optical Observation
  69. GRB091208A: Swift/UVOT refined analysis
  70. GRB 091208B: optical observations
  71. GRB 091208B: Keck HIRES redshift confirmation
  72. GRB 091208B: GROND observations
  73. GRB 091208A: Swift-XRT observations
  74. GRB091208B: NOT optical observations
  75. GRB 091208B: Swift-XRT refined analysis
  76. GRB091208B: Swift/UVOT refined analysis
  77. GRB 091208B: Fermi GBM observation
  78. GRB 091208B, Swift-BAT refined analysis
  79. GRB 091208A Swift-BAT refined analysis
  80. GRB 091208B: Gemini-North redshift
  81. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  82. GRB 091208A, RIMOTS optical upper limits
  83. GRB 091208B: MITSuME Akeno Optical Observation
  84. GRB 091208B: MITSuME Okayama Optical Observation
  85. GRB 091208B, RIMOTS optical upper limits
  86. GRB 091208B: BOOTES-3 optical afterglow
  87. GRB 091208: ROTSE-III Optical Limits
  88. Short X-ray Transient, RIMOTS optical upper limits
  89. A small revision to the GRB-naming convention
  90. GRB 091123: Suzaku WAM observation of the prompt emission
  91. GRB 091127: Skynet/PROMPT Observations of Possible Host Galaxy
  92. GRB 091127: GAO 150cm telescope Optical Observation
  93. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  94. GRB 091109A: GROND confirmation of redshift z = 3.5
  95. GRB091127: Continuing Swift/UVOT Observations
  96. GRB 091127, SMARTS optical/IR afterglow observations
  97. GRB091202: Swift-XRT refined analysis
  98. GRB 091202: Swift/UVOT Upper Limits
  99. GRB 091202: Liverpool Telescope observations
  100. GRB 091202: Optical and NIR observations

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