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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"

28117 results found.

  1. GRB 100205A: Swift-BAT refined analysis
  2. GRB 100205A: Swift UVOT upper limits
  3. GRB 100205A: Swift XRT refined analysis
  4. GRB 100203A: Swift XRT and UVOT refined analyses
  5. GRB 100205A: Enhanced Swift-XRT position
  6. GRB 100205A Gemini-North IR afterglow candidate
  7. GRB 100205A: Gemini-South Observations
  8. GRB 100205A: Super-LOTIS early observations
  9. GRB 100131A: Suzaku WAM observation of the prompt emission
  10. GRB 100205A: NOT optical observations
  11. GRB 100205A: Swift detection of a burst
  12. Short X-ray Transient detected by MAXI/GSC
  13. GRB 100131A: Fermi GBM detection
  14. GRB 100119A: Suzaku WAM observation of the prompt emission
  15. GRB 100122A: Fermi GBM detection
  16. GRB 100122A: MASTER-Net optical observations
  17. GRB 100116A: Suzaku WAM observation of the prompt emission
  18. GRB 100115A: Swift-XRT refined analysis
  19. GRB 100119A: Swift-BAT refined analysis
  20. Swift/UVOT refined analysis of GRB100117A
  21. GRB 100117A: Swift-XRT refined analysis
  22. GRB 100117A: Gemini-North upper limit
  23. GRB 100117A: Magellan IMACS imaging
  24. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  25. GRB 100117A: Swift-BAT refined analysis
  26. GRB100117A: Possible afterglow from NOT observation
  27. GRB 100117A: Swift detection of a short hard burst
  28. GRB 100115A: Gemini-N photometry
  29. GRB 100115A: Enhanced Swift-XRT position
  30. GRB 100116A: Fermi LAT detection
  31. GRB 100115A: SARA Astrometry
  32. GRB 100116A: Fermi GBM detection
  33. GRB 100115A: SARA Afterglow Candidate
  34. GRB 100115A: Swift/UVOT Upper Limits
  35. GRB 100115A: Swift-XRT candidate afterglow
  36. GRB 100111A: PAIRITEL NIR Upper Limits
  37. GRB 100111A: Swift UVOT Refined Analysis
  38. GRB 100111A: Swift-BAT refined analysis
  39. GRB 100111A: Enhanced Swift-XRT position
  40. GRB100111A: Swift-XRT refined analysis
  41. GRB 100111A: Fermi GBM observation
  42. GRB 100111A: NOT optical observations
  43. GRB 100111A: Swift detection of a burst with an optical afterglow
  44. Swift/BAT Detects an Outburst from XTE J1901+014
  45. GRB 100103A: GROND Upper Limits
  46. GRB 100103A: Swift-XRT team refined analysis
  47. GRB 100103A - UVOT-enhanced XRT position
  48. GRB 100103A: Swift/XRT position
  49. GRB 100103A: a long GRB detected with INTEGRAL
  50. Swift Trigger 381591 is probably not a burst
  51. GRB 091231: GROND NIR observations
  52. Swift Trigger 381591: Uncatalogued UVOT Source
  53. GRB 091230: Swift/UVOT Observations
  54. Trigger 381591: Swift detection of a possible burst
  55. GRB 091230: Swift-XRT observation
  56. GRB 091230: GROND optical/NIR afterglow candidate
  57. Swift Trigger 381434 is not a GRB
  58. Trigger 381434: Swift detection of a possible burst
  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. GRB 091221: Swift/UVOT refined analysis
  64. GRB 091221: Swift-XRT refined analysis
  65. GRB 091221: Enhanced Swift-XRT position
  66. GRB 091221: UVOT Confirmation of an Optical Afterglow
  67. GRB 091221: ROTSE-III Detection of Optical Counterpart
  68. GRB 091221: Swift detection of a burst
  69. Swift trigger 379449 (possible GRB) is not a burst
  70. GRB 091215: Faulkes Telescope North observations
  71. Trigger 379449: Swift detection of a possible burst
  72. GRB 091208A: Suzaku WAM observation of the prompt emission
  73. GRB 091208A: GAO 150cm telescope Optical Observation
  74. GRB091208A: Swift/UVOT refined analysis
  75. GRB 091208B: optical observations
  76. GRB 091208B: GROND observations
  77. GRB 091208A: Swift-XRT observations
  78. GRB091208B: NOT optical observations
  79. GRB 091208B: Swift-XRT refined analysis
  80. GRB 091208B, Swift-BAT refined analysis
  81. GRB 091208A Swift-BAT refined analysis
  82. GRB 091208A, RIMOTS optical upper limits
  83. GRB 091208B: MITSuME Akeno Optical Observation
  84. GRB 091208B: Enhanced Swift-XRT position
  85. GRB 091208B: MITSuME Okayama Optical Observation
  86. GRB 091208B, RIMOTS optical upper limits
  87. GRB 091208B: Swift detection of a burst with an optical afterglow
  88. GRB 091208B: BOOTES-3 optical afterglow
  89. Short X-ray Transient, RIMOTS optical upper limits
  90. GRB 091123: Suzaku WAM observation of the prompt emission
  91. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  92. GRB 091109A: GROND confirmation of redshift z = 3.5
  93. GRB 091127, SMARTS optical/IR afterglow observations
  94. GRB091202: Swift-XRT refined analysis
  95. GRB 091202: Swift/UVOT Upper Limits
  96. GRB 091202: Optical and NIR observations
  97. GRB 091202 - UVOT-enhanced XRT position
  98. GRB 091127: Zadko Telescope Observations
  99. GRB 091126A: Suzaku WAM observation of the prompt emission
  100. GRB 091202: TAROT Calern observatory optical observations

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