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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"

28285 results found.

  1. GRB 120907A: Swift-BAT refined analysis
  2. GRB 120907A: NOT optical observations
  3. GRB 120907A: Swift detection of a burst with optical counterpart
  4. GRB 120802A: optical observations in CrAO
  5. GRB 120830A: Swift-XRT and UVOT observations
  6. GRB 120830A: early MASTER optical limit
  7. GRB 120830A: Fermi-LAT detection of a short burst
  8. Fermi trigger 368003226 : MASTER optical observations
  9. GRB 120819A: Swift/UVOT Upper Limits
  10. GRB 120817A: Swift/UVOT Upper Limits
  11. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  12. GRB 120821A: Swift/UVOT Upper Limits
  13. GRB 120821A: GROND upper limits
  14. GRB 120817B - PTF Observations
  15. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  16. GRB 120811C: optical observations
  17. GRB 120819A: MASTER final limits
  18. GRB 120819A: Bassano Bresciano Observatory optical observations
  19. GRB 120819A: Swift-BAT refined analysis
  20. GRB 120819A: GROND afterglow confirmation
  21. GRB 120819A: Swift-XRT refined Analysis
  22. GRB 120819A: MITSuME Ishigakijima upper limits
  23. GRB 120819A: MITSuME Okayama Optical upper limits
  24. GRB 120819A: Enhanced Swift-XRT position
  25. GRB 120819A: afterglow candidate from NOT
  26. GRB 120819A: Swift detection of a burst
  27. GRB 120817B: Swift-XRT observations
  28. GRB 120811C: optical observations
  29. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  30. GRB 120815A: MASTER-ICATE observations
  31. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  32. GRB 120817A: Swift-XRT refined Analysis
  33. GRB 120817B: LCO Optical Observations
  34. GRB 120817A: Swift-BAT refined analysis
  35. GRB 120816A: optical upper limit
  36. GRB 120817A: Enhanced Swift-XRT position
  37. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  38. GRB 120816A: Bassano Bresciano Observatory optical observations
  39. GRB 120817A: FTN and FTS observations
  40. GRB 120816A: Swift-XRT refined Analysis
  41. GRB 120817A: Swift-XRT observations
  42. GRB 120816A: Enhanced Swift-XRT position
  43. GRB 120816A: Swift-BAT refined analysis
  44. GRB 120816A: BOOTES-2 observations
  45. GRB120816A: OPTIMA discovery of optical counterpart
  46. GRB 120816A: TAROT Calern observatory optical observations
  47. GRB 120816A: ROTSE-III Optical Limits
  48. GRB 120816A: Swift detection of a burst
  49. GRB 120815A: Swift-XRT refined Analysis
  50. GRB 120815A: Swift-BAT refined analysis
  51. GRB 120805A: Liverpool Telescope optical candidate detection
  52. GRB 120815A: Enhanced Swift-XRT position
  53. GRB 120815A: VLT/X-shooter redshift
  54. GRB 120815A: GROND afterglow candidate
  55. GRB 120815A: Swift-XRT observations
  56. GRB 120815A: TAROT La Silla observatory optical observations
  57. GRB 120815A: Swift detection of a burst
  58. GCN for GRB 120811C
  59. GRB 120811A: Swift/XRT-UVOT Obseravations
  60. GRB120804A: Chandra observations and afterglow detection
  61. GRB 120805A: optical afterglow confirmation from the NOT
  62. GRB 120805A: Enhanced Swift-XRT position
  63. GRB 120811C: RTT150 optical observations
  64. GRB 120811C: MASTER-Tunka OT observations
  65. GRB 120811C: Swift-BAT refined analysis
  66. GRB 120811A: Swift-BAT refined analysis
  67. GRB 120811C: Bassano Bresciano Observatory optical observations
  68. GRB 120811C: Swift-XRT refined Analysis
  69. GRB 120811C: Swift/UVOT Detection
  70. GRB 120811C: RTT150 optical observations
  71. GRB 120811C: Enhanced Swift-XRT position
  72. GRB 120811C: TAROT Calern observatory optical observations
  73. GRB 120811C: Swift detection of a burst with an optical counterpart
  74. Trigger 530588: Swift detection of XMM J174457-2850.3
  75. GRB 120803A: optical upper limit
  76. GRB 120807A: Swift/UVOT Upper Limits
  77. GRB 120714B: GROND/FORS2 detection of a supernova
  78. GRB 120807A: Swift-XRT refined Analysis
  79. GRB 120802A: optical observations
  80. GRB 120807A: Fermi/LAT upper limit
  81. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  82. GRB 120807A: TAROT La Silla observatory optical observations
  83. GRB 120807A: Swift-BAT refined analysis
  84. GRB 120807A: Enhanced Swift-XRT position
  85. GRB 120807A: Swift detection of a burst
  86. Fermi/GBM detection of an SGR-like burst
  87. GRB 120805A: Swift/UVOT Upper Limits
  88. Swift trigger 530214: uncertain if real or not
  89. GRB 120728A: Fermi GBM observation
  90. GRB 120805A: Swift-BAT refined analysis
  91. GRB 120802A: Swift/UVOT Upper Limits
  92. GRB 120805A: Swift-XRT refined Analysis
  93. GRB 120805A: TAROT Calern observatory optical observations
  94. GRB 120805A: Swift detection of a burst
  95. GRB 120804A: MITSuME Okayama Optical upper limits
  96. GRB 120803B: Swift-XRT refined Analysis
  97. GRB 120804A: Swift/UVOT Upper Limits
  98. GRB 120804A: Swift-BAT refined analysis
  99. GRB 120804A: Swift-XRT refined Analysis
  100. GRB 120804A: GROND upper limits

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