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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"

36090 results found.

  1. GRB 100206A: Swift-XRT refined analysis
  2. GRB 100206A: Fermi GBM observation
  3. GRB 100206A: Optical limit
  4. GRB 100206A: Swift-BAT refined analysis
  5. GRB 100206A: Enhanced Swift-XRT position
  6. GRB 100206A: Pre-explosion imaging and host candidate
  7. GRB 100206A: Swift detection of a short hard burst
  8. GRB 100205A: Gemini-N + NIRI photometry
  9. GRB 100130B: Fermi GBM detection
  10. GRB 100113A: Fermi GBM detection
  11. GRB 100205A: Swift-BAT refined analysis
  12. GRB 100205A: Swift UVOT upper limits
  13. GRB 100205A: Swift XRT refined analysis
  14. GRB 100203A: Swift XRT and UVOT refined analyses
  15. GRB 100205A: Enhanced Swift-XRT position
  16. GRB 100205A Gemini-North IR afterglow candidate
  17. GRB 100205A: Gemini-South Observations
  18. GRB 100205A: Super-LOTIS early observations
  19. GRB 100131A: Suzaku WAM observation of the prompt emission
  20. GRB 100205A: NOT optical observations
  21. GRB 100205A: Swift detection of a burst
  22. GRB 100203A Detected in Ground Analysis of BAT Data
  23. Short X-ray Transient detected by MAXI/GSC
  24. GRB 100131A: Fermi GBM detection
  25. GRB 100119A: Suzaku WAM observation of the prompt emission
  26. Konus-Wind observation of GRB 100119A
  27. GRB 100122A: Fermi GBM detection
  28. GRB 100122A: MASTER-Net optical observations
  29. GRB 100116A: Suzaku WAM observation of the prompt emission
  30. GRB 100115A: Swift-XRT refined analysis
  31. GRB 100119A: Swift-BAT refined analysis
  32. GRB091109A: VLT/FORS2 spectroscopic redshift
  33. GRB 100117A: candidate optical afterglow
  34. GRB 100119A: Swift detection of a burst
  35. Konus-Wind observation of GRB 100116A
  36. GRB 100117A: Gemini North spectroscopy
  37. GRB 100117A: Fermi GBM detection
  38. Swift/UVOT refined analysis of GRB100117A
  39. GRB 100117A: Optical object inside the revised XRT error circle
  40. GRB 100117A: Swift-XRT refined analysis
  41. GRB 100117A: Gemini-North upper limit
  42. GRB 100117A: Magellan IMACS imaging
  43. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  44. GRB 100117A: Swift-BAT refined analysis
  45. GRB 100117A: Swift detection of a short hard burst
  46. GRB 100115A: Gemini-N photometry
  47. GRB 100115A: Enhanced Swift-XRT position
  48. GRB 100116A: Fermi LAT detection
  49. GRB 100115A: SARA Astrometry
  50. GRB 100116A: Fermi GBM detection
  51. NOT observation of GRB100115A localization
  52. GRB 100115A: SARA Afterglow Candidate
  53. GRB 100115A: Swift/UVOT Upper Limits
  54. GRB 100115A: Swift-XRT candidate afterglow
  55. GRB 100115A detected in ground analysis of Swift-BAT data
  56. GRB 100111A: PAIRITEL NIR Upper Limits
  57. GRB 100111A: Swift UVOT Refined Analysis
  58. GRB 100111A: Swift-BAT refined analysis
  59. GRB 100111A: Enhanced Swift-XRT position
  60. GRB100111A: Swift-XRT refined analysis
  61. GRB 100111A: Fermi GBM observation
  62. GRB 100111A: NOT optical observations
  63. GRB 100111A: Swift detection of a burst with an optical afterglow
  64. GRB 100103A: GROND Upper Limits
  65. GRB 100103A: Swift-XRT team refined analysis
  66. GRB 100103A - UVOT-enhanced XRT position
  67. Konus-Wind observation of GRB 100103A
  68. GRB 100103A: Swift/UVOT Upper Limits
  69. GRB 100103A: Correction to Swift position error
  70. GRB 100103A: Swift/XRT position
  71. GRB 100103A: a long GRB detected with INTEGRAL
  72. Swift Trigger 381591 is probably not a burst
  73. GRB 091231: GROND NIR observations
  74. GRB 091230: Swift/UVOT Observations
  75. GRB 091230: Swift-XRT observation
  76. GRB 091230: GROND optical/NIR afterglow candidate
  77. GRB 091230: a long GRB detected by INTEGRAL
  78. Swift Trigger 381434 is not a GRB
  79. Trigger 381434: Swift detection of a possible burst
  80. GRB 091221 : IRSF NIR upper limit
  81. GRB 091221: Skynet/PROMPT Detections
  82. GRB 091221: Fermi GBM Observation
  83. GRB 091117: Swift-XRT late time observations
  84. GRB 091221 Swift-BAT refined analysis
  85. GRB 091221: Swift/UVOT refined analysis
  86. GRB 091221: Swift-XRT refined analysis
  87. GRB 091221: Enhanced Swift-XRT position
  88. GRB 091221, GROND observations
  89. GRB 091221: UVOT Confirmation of an Optical Afterglow
  90. GRB 091221: ROTSE-III Detection of Optical Counterpart
  91. GRB 091221: Swift detection of a burst
  92. Swift trigger 379449 (possible GRB) is not a burst
  93. GRB 091215: Faulkes Telescope North observations
  94. Trigger 379449: Swift detection of a possible burst
  95. GRB 091208B: Xinglong TNT optical observation
  96. GRB 091208A: Suzaku WAM observation of the prompt emission
  97. GRB 091208A: GAO 150cm telescope Optical Observation
  98. Konus-Wind observation of GRB 091208A
  99. GRB 091208B: GAO 150cm telescope Optical Observation
  100. GRB 091208B: optical observations

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