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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"

37769 results found.

  1. GRB 100115A: SARA Astrometry
  2. GRB 100116A: Fermi GBM detection
  3. NOT observation of GRB100115A localization
  4. GRB 100115A: SARA Afterglow Candidate
  5. GRB 100115A: Swift/UVOT Upper Limits
  6. GRB 100115A: Swift-XRT candidate afterglow
  7. GRB 100115A detected in ground analysis of Swift-BAT data
  8. GRB 100111A: PAIRITEL NIR Upper Limits
  9. GRB 100111A: Swift UVOT Refined Analysis
  10. GRB 100111A: Swift-BAT refined analysis
  11. GRB 100111A: Enhanced Swift-XRT position
  12. GRB100111A: Swift-XRT refined analysis
  13. GRB 100111A: Fermi GBM observation
  14. GRB 100111A: NOT optical observations
  15. GRB 100111A: Swift detection of a burst with an optical afterglow
  16. GRB 100103A: GROND Upper Limits
  17. GRB 100103A: Swift-XRT team refined analysis
  18. GRB 100103A - UVOT-enhanced XRT position
  19. Konus-Wind observation of GRB 100103A
  20. GRB 100103A: Swift/UVOT Upper Limits
  21. GRB 100103A: Correction to Swift position error
  22. GRB 100103A: Swift/XRT position
  23. GRB 100103A: a long GRB detected with INTEGRAL
  24. Swift Trigger 381591 is probably not a burst
  25. GRB 091231: GROND NIR observations
  26. GRB 091230: Swift/UVOT Observations
  27. GRB 091230: Swift-XRT observation
  28. GRB 091230: GROND optical/NIR afterglow candidate
  29. GRB 091230: a long GRB detected by INTEGRAL
  30. Swift Trigger 381434 is not a GRB
  31. Trigger 381434: Swift detection of a possible burst
  32. GRB 091221 : IRSF NIR upper limit
  33. GRB 091221: Skynet/PROMPT Detections
  34. GRB 091221: Fermi GBM Observation
  35. GRB 091117: Swift-XRT late time observations
  36. GRB 091221 Swift-BAT refined analysis
  37. GRB 091221: Swift/UVOT refined analysis
  38. GRB 091221: Swift-XRT refined analysis
  39. GRB 091221: Enhanced Swift-XRT position
  40. GRB 091221, GROND observations
  41. GRB 091221: UVOT Confirmation of an Optical Afterglow
  42. GRB 091221: ROTSE-III Detection of Optical Counterpart
  43. GRB 091221: Swift detection of a burst
  44. Swift trigger 379449 (possible GRB) is not a burst
  45. GRB 091215: Faulkes Telescope North observations
  46. Trigger 379449: Swift detection of a possible burst
  47. GRB 091208B: Xinglong TNT optical observation
  48. GRB 091208A: Suzaku WAM observation of the prompt emission
  49. GRB 091208A: GAO 150cm telescope Optical Observation
  50. Konus-Wind observation of GRB 091208A
  51. GRB 091208B: GAO 150cm telescope Optical Observation
  52. GRB 091208B: optical observations
  53. GRB 091208B: Keck HIRES redshift confirmation
  54. GRB 091208B: GROND observations
  55. GRB 091208A: Swift-XRT observations
  56. GRB 091208B: Swift-XRT refined analysis
  57. GRB091208B: Swift/UVOT refined analysis
  58. GRB 091208B: Fermi GBM observation
  59. GRB 091208B, Swift-BAT refined analysis
  60. GRB 091208A Swift-BAT refined analysis
  61. GRB 091208B: Gemini-North redshift
  62. GRB 091208B: Faulkes Telescope North and South Optical Afterglow
  63. GRB 091208A, RIMOTS optical upper limits
  64. GRB 091208B: MITSuME Akeno Optical Observation
  65. GRB 091208B: Enhanced Swift-XRT position
  66. GRB 091208B: MITSuME Okayama Optical Observation
  67. GRB 091208B, RIMOTS optical upper limits
  68. GRB 091208B: Swift detection of a burst with an optical afterglow
  69. GRB 091208B: BOOTES-3 optical afterglow
  70. GRB 091208: ROTSE-III Optical Limits
  71. GRB 091208: Swift detection of a burst
  72. A small revision to the GRB-naming convention
  73. GRB 091123: Suzaku WAM observation of the prompt emission
  74. GRB 091127: Skynet/PROMPT Observations of Possible Host Galaxy
  75. GRB 091127: GAO 150cm telescope Optical Observation
  76. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  77. GRB 091109A: GROND confirmation of redshift z = 3.5
  78. GRB091127: Continuing Swift/UVOT Observations
  79. GRB 091127, SMARTS optical/IR afterglow observations
  80. GRB091202: Swift-XRT refined analysis
  81. GRB 091202: Swift/UVOT Upper Limits
  82. GRB 091202: Liverpool Telescope observations
  83. GRB 091202: Optical and NIR observations
  84. GRB 091202 - UVOT-enhanced XRT position
  85. GRB 091127: Zadko Telescope Observations
  86. GRB 091126A: Suzaku WAM observation of the prompt emission
  87. GRB 091202: TAROT Calern observatory optical observations
  88. GRB 091202: Liverpool Telescope Observations
  89. GRB 091202: a long GRB detected by INTEGRAL
  90. GRB 091127: redshift confirmation with X-shooter
  91. GRB 091117: Chandra Observations
  92. GRB 091020: MASTER-Net optical polarization observations
  93. GRB 091127: Skynet/PROMPT Continued Observations of Fading
  94. Short X-ray Transient Detection by MAXI/GSC
  95. Konus-Wind observation of very long GRB 091123
  96. GRB 091130A: Xinglong TNT upper limit
  97. GRB 091123: Fermi GBM detection of a very long burst
  98. GRB 091126B: Fermi GBM detection
  99. GRB 091127: Suzaku WAM observation of the prompt emission
  100. GRB 091126: Fermi GBM detection

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