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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"

28246 results found.

  1. GRB 120817A: Swift/UVOT Upper Limits
  2. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  3. GRB 120821A: Swift/XRT observations
  4. GRB 120821A: Swift/UVOT Upper Limits
  5. GRB 120821A: GROND upper limits
  6. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  7. GRB 120811C: optical observations
  8. GRB 120819A: GROND afterglow confirmation
  9. GRB 120819A: Swift-XRT refined Analysis
  10. GRB 120819A: MITSuME Ishigakijima upper limits
  11. GRB 120819A: MITSuME Okayama Optical upper limits
  12. GRB 120819A: Enhanced Swift-XRT position
  13. GRB 120819A: afterglow candidate from NOT
  14. GRB 120819A: Swift detection of a burst
  15. GRB 120817B: Swift-XRT observations
  16. GRB 120811C: optical observations
  17. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  18. Konus-Wind observation of GRB 120817B
  19. GRB 120817A: Swift-XRT refined Analysis
  20. GRB 120817B: Fermi GBM detection
  21. GRB 120816A: optical upper limit
  22. GRB 120817A: Enhanced Swift-XRT position
  23. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  24. GRB 120817A: FTN and FTS observations
  25. GRB 120816A: Swift-XRT refined Analysis
  26. GRB 120817A: Swift-XRT observations
  27. GRB 120817A: Swift detection of a burst
  28. GRB 120816A: Enhanced Swift-XRT position
  29. GRB 120816A: BOOTES-2 observations
  30. GRB120816A: OPTIMA discovery of optical counterpart
  31. GRB 120816A: TAROT Calern observatory optical observations
  32. GRB 120816A: ROTSE-III Optical Limits
  33. GRB 120816A: Swift detection of a burst
  34. GRB 120815A: Swift-XRT refined Analysis
  35. GRB 120805A: Liverpool Telescope optical candidate detection
  36. GRB 120815A: Enhanced Swift-XRT position
  37. GRB 120815A: VLT/X-shooter redshift
  38. GRB 120815A: GROND afterglow candidate
  39. GRB 120815A: Swift-XRT observations
  40. GRB 120815A: Swift detection of a burst
  41. GRB 120804A: Possible temporal break in the X-ray light-curve
  42. GRB 120811A: Swift/XRT-UVOT Obseravations
  43. GRB120804A: Chandra observations and afterglow detection
  44. GRB 120805A: optical afterglow confirmation from the NOT
  45. GRB 120805A: Enhanced Swift-XRT position
  46. GRB 120811C: EVLA Observations
  47. GRB 120811C: RTT150 optical observations
  48. GRB 120811C: NOT redshift
  49. GRB 120811C: Swift-XRT refined Analysis
  50. GRB 120811C: Swift/UVOT Detection
  51. GRB 120811C: Redshift from OSIRIS/GTC
  52. GRB 120811C: RTT150 optical observations
  53. GRB 120811C: Enhanced Swift-XRT position
  54. GRB 120811C: TAROT Calern observatory optical observations
  55. GRB 120811C: MASTER-Amur observations of fading OT
  56. GRB 120811C: Swift detection of a burst with an optical counterpart
  57. Trigger 530588: Swift detection of XMM J174457-2850.3
  58. GRB 120803A: optical upper limit
  59. GRB 120807A: Swift/UVOT Upper Limits
  60. GRB 120803A: Confirmation of the X-ray afterglow
  61. GRB 120714B: GROND/FORS2 detection of a supernova
  62. GRB 120804A: ATCA 34GHz upper limit
  63. GRB 120807A: Swift-XRT refined Analysis
  64. GRB 120802A: optical observations
  65. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  66. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  67. GRB 120807A: TAROT La Silla observatory optical observations
  68. GRB 120807A: Enhanced Swift-XRT position
  69. GRB 120807A: Swift detection of a burst
  70. GRB 120804A: ATCA 34GHz upper limit
  71. Fermi/GBM detection of an SGR-like burst
  72. GRB 120805A: Swift/UVOT Upper Limits
  73. Swift trigger 530214: uncertain if real or not
  74. GRB 120802A: Swift/UVOT Upper Limits
  75. GRB 120805A: Swift-XRT refined Analysis
  76. GRB 120805A: 1.23m CAHA observations
  77. GRB120805A: Liverpool Telescope observations
  78. GRB 120805A: Swift detection of a burst
  79. GRB 120804A: EVLA Detection
  80. GRB 120804A: Gemini-North observations
  81. GRB 120804A: MITSuME Okayama Optical upper limits
  82. GRB 120803B: Swift-XRT refined Analysis
  83. GRB 120804A: Swift/UVOT Upper Limits
  84. GRB 120804A: Swift-XRT refined Analysis
  85. GRB 120804A: GROND upper limits
  86. GRB 120802A: EVLA Observations
  87. GRB 120804A: Enhanced Swift-XRT position
  88. GRB 120803B: MITSuME Okayama Optical upper limits
  89. GRB 120803A: MITSuME Okayama Optical upper limits
  90. GRB 120804A: Swift detection of a short burst
  91. GRB 120803B: Enhanced Swift-XRT position
  92. GRB 120803B: MITSuME Akeno Optical upper limits
  93. GRB 120803A: Swift-XRT Observations
  94. GRB 120803A: Swift-BAT refined analysis
  95. GRB 120803B: FTN possible afterglow candidate
  96. GRB 120803B: Swift detection of a burst
  97. GRB 120803A: Swift detection of a possible burst
  98. GRB 120802A: GRT Optical Observation
  99. GRB 120802A: Swift-XRT refined Analysis
  100. GRB 120802A Gemini-N redshift

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