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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"

36368 results found.

  1. GRB 120911A: Swift-XRT observations
  2. GRB 120911A: ROTSE-III Optical Limits
  3. GRB 120911A: Swift detection of a burst
  4. GRB 120907A: SMA upper limits
  5. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  6. GRB 120908A: Fermi GBM detection
  7. GRB 120908A: Swift Observations
  8. GRB 120909A: TAROT La Silla observatory optical observations
  9. GRB 120909A: Pi of the Sky upper limits
  10. GRB 120909A: Fermi GBM observation
  11. Konus-Wind observation of GRB 120909A
  12. GRB 120909A: Swift/UVOT Detection
  13. GRB 120909A: Swift-XRT refined Analysis
  14. GRB 120909A: Swift-BAT refined analysis
  15. GRB 120909A: Enhanced Swift-XRT position
  16. GRB 120908A: MAXI/GSC detection
  17. GRB 120909A: X-Shooter redshift 3.93
  18. GRB 120909A: GROND detection of the afterglow
  19. GRB 120909A: Swift detection of a burst
  20. GRB 120907A: EVLA observations
  21. GRB 120907A: Swift/UVOT Detection
  22. GRB 120907A: Swift-XRT refined Analysis
  23. GRB 120907A: Spectroscopy from OSIRIS/GTC
  24. GRB 120907A: Enhanced Swift-XRT position
  25. GRB 120907A: Fermi GBM detection
  26. GRB 120907A: Swift-BAT refined analysis
  27. GRB 120907A: NOT optical observations
  28. GRB 120907A MASTER optical observations
  29. GRB 120907A: ROTSE-III Optical Limits
  30. GRB 120907A: Swift detection of a burst with optical counterpart
  31. GRB 120819A: optical upper limit
  32. GRB 120802A: optical observations in CrAO
  33. GRB 120830A: Further Swift Observations
  34. GRB 120830A: catalog source at Uvot position
  35. GRB 120830A: Swift-XRT and UVOT observations
  36. GRB 120830A: Fermi GBM observation
  37. Konus-Wind observation of GRB 120830A
  38. GRB 120830A: early MASTER optical limit
  39. IPN Triangulation of short GRB 120830A
  40. GRB 120830A: Fermi-LAT detection of a short burst
  41. Fermi trigger 368003226 : MASTER optical observations
  42. GRB 120819A: Swift/UVOT Upper Limits
  43. GRB 120817A: Swift/UVOT Upper Limits
  44. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  45. GRB 120821A: Swift/XRT observations
  46. GRB 120821A: Swift/UVOT Upper Limits
  47. GRB 120821A: GROND upper limits
  48. GRB 120821A: a long GRB detected by INTEGRAL
  49. GRB 120817B - PTF Observations
  50. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  51. GRB 120811C: optical observations
  52. GRB 120817B: BAT location in ground analysis and refined analysis
  53. GRB 120819A: MASTER final limits
  54. GRB 120819A: Bassano Bresciano Observatory optical observations
  55. GRB 120819A: Swift-BAT refined analysis
  56. GRB 120819A: GROND afterglow confirmation
  57. GRB 120819A: Swift-XRT refined Analysis
  58. GRB 120819A: MITSuME Ishigakijima upper limits
  59. GRB 120819A: MITSuME Okayama Optical upper limits
  60. GRB 120819A: Enhanced Swift-XRT position
  61. GRB 120819A: afterglow candidate from NOT
  62. GRB 120819A: MASTER optical observations
  63. GRB 120819A: Swift detection of a burst
  64. GRB 120817B: Swift-XRT observations
  65. GRB 120811C: optical observations
  66. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  67. GRB 120815A: MASTER-ICATE observations
  68. Konus-Wind observation of GRB 120816B
  69. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  70. Konus-Wind observation of GRB 120817B
  71. GRB 120817A: Swift-XRT refined Analysis
  72. GRB 120817B: LCO Optical Observations
  73. GRB 120817B: Fermi GBM detection
  74. IPN Triangulation of GRB 120817B (short/very intense)
  75. GRB 120817A: Swift-BAT refined analysis
  76. GRB 120816A: optical upper limit
  77. GRB 120817A: Enhanced Swift-XRT position
  78. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  79. GRB 120816A: Bassano Bresciano Observatory optical observations
  80. GRB 120817A: FTN and FTS observations
  81. GRB 120816A: Swift-XRT refined Analysis
  82. GRB 120817A: Swift-XRT observations
  83. GRB 120817A: Swift detection of a burst
  84. GRB 120816A: Enhanced Swift-XRT position
  85. GRB 120816A: Swift-BAT refined analysis
  86. GRB 120816A: BOOTES-2 observations
  87. GRB120816A: OPTIMA discovery of optical counterpart
  88. GRB 120816A: TAROT Calern observatory optical observations
  89. GRB 120816A: ROTSE-III Optical Limits
  90. GRB 120816A: Swift detection of a burst
  91. GRB 120815A: Swift-XRT refined Analysis
  92. GRB 120815A: Swift-BAT refined analysis
  93. GRB 120805A: Liverpool Telescope optical candidate detection
  94. GRB 120815A: Enhanced Swift-XRT position
  95. GRB 120815A: VLT/X-shooter redshift
  96. GRB 120815A: GROND afterglow candidate
  97. GRB 120815A: Swift-XRT observations
  98. GRB 120815A: TAROT La Silla observatory optical observations
  99. GRB 120815A: Swift detection of a burst
  100. GRB 120811B: Fermi GBM observation

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