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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"

20411 results found.

  1. GRB 100205A: Swift UVOT upper limits
  2. GRB 100203A: Swift XRT and UVOT refined analyses
  3. GRB 100205A: Enhanced Swift-XRT position
  4. GRB 100205A Gemini-North IR afterglow candidate
  5. GRB 100205A: Gemini-South Observations
  6. GRB 100205A: Super-LOTIS early observations
  7. GRB 100205A: NOT optical observations
  8. GRB 100205A: Swift detection of a burst
  9. GRB 100203A Detected in Ground Analysis of BAT Data
  10. Short X-ray Transient detected by MAXI/GSC
  11. GRB 100122A: MASTER-Net optical observations
  12. GRB 100116A: Suzaku WAM observation of the prompt emission
  13. GRB 100119A: Swift-BAT refined analysis
  14. Swift/UVOT refined analysis of GRB100117A
  15. GRB 100117A: Gemini South Imaging and CFHT Pre-Explosion Images
  16. GRB100117A: Possible afterglow from NOT observation
  17. GRB 100117A: Swift detection of a short hard burst
  18. GRB 100115A: Gemini-N photometry
  19. GRB 100115A: Enhanced Swift-XRT position
  20. GRB 100116A: Fermi LAT detection
  21. GRB 100115A: SARA Astrometry
  22. GRB 100115A: SARA Afterglow Candidate
  23. GRB 100115A: Swift/UVOT Upper Limits
  24. GRB 100115A: Swift-XRT candidate afterglow
  25. GRB 100115A detected in ground analysis of Swift-BAT data
  26. GRB 100111A: PAIRITEL NIR Upper Limits
  27. GRB 100111A: Swift UVOT Refined Analysis
  28. GRB 100111A: Enhanced Swift-XRT position
  29. GRB 100111A: NOT optical observations
  30. GRB 100111A: Swift detection of a burst with an optical afterglow
  31. Swift/BAT Detects an Outburst from XTE J1901+014
  32. GRB 100103A: GROND Upper Limits
  33. GRB 100103A - UVOT-enhanced XRT position
  34. GRB 100103A: Swift/XRT position
  35. GRB 091231: GROND NIR observations
  36. Swift Trigger 381591: Uncatalogued UVOT Source
  37. GRB 091230: Swift/UVOT Observations
  38. Trigger 381591: Swift detection of a possible burst
  39. GRB 091230: Swift-XRT observation
  40. GRB 091230: GROND optical/NIR afterglow candidate
  41. Swift Trigger 381434 is not a GRB
  42. Trigger 381434: Swift detection of a possible burst
  43. GRB 091221: Skynet/PROMPT Detections
  44. GRB 091117: Swift-XRT late time observations
  45. GRB 091221: Swift/UVOT refined analysis
  46. GRB 091221: Enhanced Swift-XRT position
  47. GRB 091221: UVOT Confirmation of an Optical Afterglow
  48. GRB 091221: Swift detection of a burst
  49. Swift trigger 379449 (possible GRB) is not a burst
  50. GRB 091215: Faulkes Telescope North observations
  51. Trigger 379449: Swift detection of a possible burst
  52. GRB 091208A: GAO 150cm telescope Optical Observation
  53. GRB091208A: Swift/UVOT refined analysis
  54. GRB 091208B: optical observations
  55. GRB 091208B: GROND observations
  56. GRB 091208A: Swift-XRT observations
  57. GRB091208B: NOT optical observations
  58. GRB 091208A, RIMOTS optical upper limits
  59. GRB 091208B: MITSuME Akeno Optical Observation
  60. GRB 091208B: Enhanced Swift-XRT position
  61. GRB 091208B: MITSuME Okayama Optical Observation
  62. GRB 091208B, RIMOTS optical upper limits
  63. GRB 091208B: Swift detection of a burst with an optical afterglow
  64. GRB 091208B: BOOTES-3 optical afterglow
  65. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  66. GRB 091109A: GROND confirmation of redshift z = 3.5
  67. GRB 091127, SMARTS optical/IR afterglow observations
  68. GRB 091202: Swift/UVOT Upper Limits
  69. GRB 091202 - UVOT-enhanced XRT position
  70. GRB 091127: Zadko Telescope Observations
  71. GRB 091202: TAROT Calern observatory optical observations
  72. GRB 091117: Chandra Observations
  73. GRB 091020: MASTER-Net optical polarization observations
  74. GRB 091123: Fermi GBM detection of a very long burst
  75. GRB 091130B: Swift/UVOT Upper Limits
  76. GRB 091127: Skynet/PROMPT Observations of Fading
  77. GRB 091130B: Enhanced Swift-XRT position
  78. GRB 091130B: Swift detection of a burst
  79. GRB 091127: Radio observations
  80. Konus-Wind observation of GRB 091127
  81. GRB 091127: TAROT La Silla observatory optical observations
  82. GRB 091127: LABOCA/APEX submm observations
  83. GRB 091127: Further NOT optical observations
  84. GRB 091127: MASTER early optical transient polarimetry
  85. GRB 091127: Swift-XRT afterglow detection and analysis
  86. GRB 091127: TAROT La Silla observatory optical decay
  87. GRB 091127: Swift/UVOT observations
  88. GRB 091127: Swift-BAT refined analysis
  89. GRB 091127: NOT observations
  90. GRB 091127 : GROND observations
  91. GRB 091127: REM NIR afterglow detection
  92. GRB 091120: Fermi GBM observation
  93. GRB 091117: TNG optical observations
  94. GRB 091117A: Swift/UVOT followup observations
  95. GRB 091117: Evidence for Variability of XRT Source #1
  96. GRB091117: Gemini South Observations
  97. GRB 091117: Swift XRT refined analysis
  98. GRB091111: Swift XRT refined analysis
  99. GRB 091112: Swift-BAT refined analysis
  100. GRB 091031: Fermi LAT detection of a faint burst

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