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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"

42862 results found.

  1. GRB 120830A: Swift-XRT and UVOT observations
  2. GRB 120830A: Fermi GBM observation
  3. Konus-Wind observation of GRB 120830A
  4. GRB 120830A: early MASTER optical limit
  5. IPN Triangulation of short GRB 120830A
  6. GRB 120830A: Fermi-LAT detection of a short burst
  7. Fermi trigger 368003226 : MASTER optical observations
  8. GRB 120819A: Swift/UVOT Upper Limits
  9. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  10. GRB 120821A: Swift/XRT observations
  11. GRB 120821A: a long GRB detected by INTEGRAL
  12. GRB 120817B - PTF Observations
  13. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  14. GRB 120811C: optical observations
  15. GRB 120817B: BAT location in ground analysis and refined analysis
  16. GRB 120819A: MASTER final limits
  17. GRB 120819A: Swift-BAT refined analysis
  18. GRB 120819A: GROND afterglow confirmation
  19. GRB 120819A: Swift-XRT refined Analysis
  20. GRB 120819A: Enhanced Swift-XRT position
  21. GRB 120819A: afterglow candidate from NOT
  22. GRB 120819A: MASTER optical observations
  23. GRB 120819A: Swift detection of a burst
  24. GRB 120817B: Swift-XRT observations
  25. GRB 120811C: optical observations
  26. GRB 120815A: MASTER-ICATE observations
  27. Konus-Wind observation of GRB 120816B
  28. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  29. Konus-Wind observation of GRB 120817B
  30. GRB 120817A: Swift-XRT refined Analysis
  31. GRB 120817B: LCO Optical Observations
  32. GRB 120817B: Fermi GBM detection
  33. IPN Triangulation of GRB 120817B (short/very intense)
  34. GRB 120817A: Swift-BAT refined analysis
  35. GRB 120816A: optical upper limit
  36. GRB 120817A: Enhanced Swift-XRT position
  37. GRB 120817A: FTN and FTS observations
  38. GRB 120816A: Swift-XRT refined Analysis
  39. GRB 120817A: Swift-XRT observations
  40. GRB 120817A: Swift detection of a burst
  41. GRB 120816A: Enhanced Swift-XRT position
  42. GRB 120816A: Swift-BAT refined analysis
  43. GRB 120816A: BOOTES-2 observations
  44. GRB120816A: OPTIMA discovery of optical counterpart
  45. GRB 120816A: TAROT Calern observatory optical observations
  46. GRB 120816A: Swift detection of a burst
  47. GRB 120815A: Swift-XRT refined Analysis
  48. GRB 120815A: Swift-BAT refined analysis
  49. GRB 120805A: Liverpool Telescope optical candidate detection
  50. GRB 120815A: Enhanced Swift-XRT position
  51. GRB 120815A: VLT/X-shooter redshift
  52. GRB 120815A: GROND afterglow candidate
  53. GRB 120815A: Swift-XRT observations
  54. GRB 120815A: TAROT La Silla observatory optical observations
  55. GRB 120815A: Swift detection of a burst
  56. GRB 120811B: Fermi GBM observation
  57. GRB 120804A: Possible temporal break in the X-ray light-curve
  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: EVLA Observations
  64. GRB 120811C: RTT150 optical observations
  65. GRB 120811C: MASTER-Tunka OT observations
  66. GRB 120811C: Swift-BAT refined analysis
  67. GRB 120811A: Swift-BAT refined analysis
  68. GRB 120811C: NOT redshift
  69. GRB 120811C: Bassano Bresciano Observatory optical observations
  70. GRB 120811C: Swift-XRT refined Analysis
  71. GRB 120811C: Swift/UVOT Detection
  72. GRB 120811C: Redshift from OSIRIS/GTC
  73. Improved IPN error box for short hard GRB 120811B
  74. GRB 120811C: RTT150 optical observations
  75. GRB 120811C: Enhanced Swift-XRT position
  76. GRB 120811C: TAROT Calern observatory optical observations
  77. GRB 120811C: MASTER-Amur observations of fading OT
  78. GRB 120811C: Swift detection of a burst with an optical counterpart
  79. Konus-Wind observation of GRB 120811B
  80. IPN Triangulation of short hard GRB 120811B
  81. Trigger 530588: Swift detection of XMM J174457-2850.3
  82. Swift Trigger 530581: GRB 120811A or a galactic transient
  83. GRB 120803A: optical upper limit
  84. GRB 120803A: Confirmation of the X-ray afterglow
  85. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  86. GRB 120714B: GROND/FORS2 detection of a supernova
  87. Swift Trigger 530441 is a false trigger
  88. GRB 120804A: ATCA 34GHz upper limit
  89. GRB 120807A: Swift-XRT refined Analysis
  90. GRB 120802A: optical observations
  91. GRB 120807A: Fermi/LAT upper limit
  92. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  93. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  94. GRB 120807A: TAROT La Silla observatory optical observations
  95. GRB 120807A: Swift-BAT refined analysis
  96. GRB 120807A: Enhanced Swift-XRT position
  97. GRB 120807A: Swift detection of a burst
  98. GRB 120804A: ATCA 34GHz upper limit
  99. Fermi/GBM detection of an SGR-like burst
  100. Swift-BAT trigger 530214 is noise

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