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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"

37906 results found.

  1. GRB 100122A: MASTER-Net optical observations
  2. GRB 100116A: Suzaku WAM observation of the prompt emission
  3. GRB 100115A: Swift-XRT refined analysis
  4. GRB 100119A: Swift-BAT refined analysis
  5. GRB091109A: VLT/FORS2 spectroscopic redshift
  6. GRB 100117A: candidate optical afterglow
  7. GRB 100119A: Swift detection of a burst
  8. Konus-Wind observation of GRB 100116A
  9. GRB 100117A: Gemini North spectroscopy
  10. GRB 100117A: Fermi GBM detection
  11. Swift/UVOT refined analysis of GRB100117A
  12. GRB 100117A: Optical object inside the revised XRT error circle
  13. GRB 100117A: Swift-XRT refined analysis
  14. GRB 100117A: Gemini-North upper limit
  15. GRB 100117A: Magellan IMACS imaging
  16. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  17. GRB 100117A: Swift-BAT refined analysis
  18. GRB 100117A: Swift detection of a short hard burst
  19. GRB 100115A: Gemini-N photometry
  20. GRB 100115A: Enhanced Swift-XRT position
  21. GRB 100116A: Fermi LAT detection
  22. GRB 100115A: SARA Astrometry
  23. GRB 100116A: Fermi GBM detection
  24. NOT observation of GRB100115A localization
  25. GRB 100115A: SARA Afterglow Candidate
  26. GRB 100115A: Swift/UVOT Upper Limits
  27. GRB 100115A: Swift-XRT candidate afterglow
  28. GRB 100115A detected in ground analysis of Swift-BAT data
  29. GRB 100111A: PAIRITEL NIR Upper Limits
  30. GRB 100111A: Swift UVOT Refined Analysis
  31. GRB 100111A: Swift-BAT refined analysis
  32. GRB 100111A: Enhanced Swift-XRT position
  33. GRB100111A: Swift-XRT refined analysis
  34. GRB 100111A: Fermi GBM observation
  35. GRB 100111A: NOT optical observations
  36. GRB 100111A: Swift detection of a burst with an optical afterglow
  37. Swift/BAT Detects an Outburst from XTE J1901+014
  38. Swift Trigger #382159 is due to XTE J1752-223
  39. GRB 100103A: GROND Upper Limits
  40. GRB 100103A: Swift-XRT team refined analysis
  41. GRB 100103A - UVOT-enhanced XRT position
  42. Konus-Wind observation of GRB 100103A
  43. GRB 100103A: Swift/UVOT Upper Limits
  44. GRB 100103A: Correction to Swift position error
  45. GRB 100103A: Swift/XRT position
  46. GRB 100103A: a long GRB detected with INTEGRAL
  47. Swift Trigger 381591: Retraction of Reported UVOT Source
  48. Swift Trigger 381591 is probably not a burst
  49. GRB 091231: GROND NIR observations
  50. Swift Trigger 381591: Uncatalogued UVOT Source
  51. GRB 091230: Swift/UVOT Observations
  52. Trigger 381591: Swift detection of a possible burst
  53. GRB 091230: Swift-XRT observation
  54. GRB 091230: GROND optical/NIR afterglow candidate
  55. GRB 091230: a long GRB detected by INTEGRAL
  56. Swift Trigger 381434 is not a GRB
  57. Trigger 381434: Swift detection of a possible burst
  58. GRB 091221 : IRSF NIR upper limit
  59. GRB 091221: Skynet/PROMPT Detections
  60. GRB 091221: Fermi GBM Observation
  61. GRB 091117: Swift-XRT late time observations
  62. GRB 091221 Swift-BAT refined analysis
  63. GRB091221: Swift/UVOT refined analysis, correction.
  64. GRB 091221: Swift/UVOT refined analysis
  65. GRB 091221: Swift-XRT refined analysis
  66. GRB 091221: Enhanced Swift-XRT position
  67. GRB 091221, GROND observations
  68. GRB 091221: UVOT Confirmation of an Optical Afterglow
  69. GRB 091221: ROTSE-III Detection of Optical Counterpart
  70. GRB 091221: Swift detection of a burst
  71. Swift trigger 379449 (possible GRB) is not a burst
  72. GRB 091215: Faulkes Telescope North observations
  73. Trigger 379449: Swift detection of a possible burst
  74. GRB 091208B: Xinglong TNT optical observation
  75. GRB 091208A: Suzaku WAM observation of the prompt emission
  76. GRB 091208A: GAO 150cm telescope Optical Observation
  77. Konus-Wind observation of GRB 091208A
  78. GRB 091208B: GAO 150cm telescope Optical Observation
  79. GRB091208A: Swift/UVOT refined analysis
  80. GRB 091208B: optical observations
  81. GRB 091208B: Keck HIRES redshift confirmation
  82. GRB 091208B: GROND observations
  83. GRB 091208A: Swift-XRT observations
  84. GRB 091208B: Swift-XRT refined analysis
  85. GRB091208B: Swift/UVOT refined analysis
  86. GRB 091208B: Fermi GBM observation
  87. GRB 091208B, Swift-BAT refined analysis
  88. GRB 091208A Swift-BAT refined analysis
  89. GRB 091208B: Gemini-North redshift
  90. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  91. GRB 091208A, RIMOTS optical upper limits
  92. GRB 091208B: MITSuME Akeno Optical Observation
  93. GRB 091208B: Enhanced Swift-XRT position
  94. GRB 091208B: MITSuME Okayama Optical Observation
  95. GRB 091208B, RIMOTS optical upper limits
  96. GRB 091208B: Swift detection of a burst with an optical afterglow
  97. GRB 091208B: BOOTES-3 optical afterglow
  98. GRB 091208: ROTSE-III Optical Limits
  99. GRB 091208: Swift detection of a burst
  100. A small revision to the GRB-naming convention

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