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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"

42478 results found.

  1. GRB 120802A: optical observations in CrAO
  2. GRB 120830A: Further Swift Observations
  3. GRB 120830A: catalog source at Uvot position
  4. GRB 120830A: Swift-XRT and UVOT observations
  5. GRB 120830A: Fermi GBM observation
  6. Konus-Wind observation of GRB 120830A
  7. GRB 120830A: early MASTER optical limit
  8. GRB 120830A: Fermi-LAT detection of a short burst
  9. Fermi trigger 368003226 : MASTER optical observations
  10. GRB 120819A: Swift/UVOT Upper Limits
  11. GRB 120817A: Swift/UVOT Upper Limits
  12. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  13. GRB 120821A: Swift/XRT observations
  14. GRB 120821A: Swift/UVOT Upper Limits
  15. GRB 120821A: GROND upper limits
  16. GRB 120821A: a long GRB detected by INTEGRAL
  17. GRB 120817B - PTF Observations
  18. GRB 120811C: optical observations
  19. GRB 120819A: Bassano Bresciano Observatory optical observations
  20. GRB 120819A: Swift-BAT refined analysis
  21. GRB 120819A: GROND afterglow confirmation
  22. GRB 120819A: Swift-XRT refined Analysis
  23. GRB 120819A: MITSuME Ishigakijima upper limits
  24. GRB 120819A: MITSuME Okayama Optical upper limits
  25. GRB 120819A: Enhanced Swift-XRT position
  26. GRB 120819A: afterglow candidate from NOT
  27. GRB 120819A: MASTER optical observations
  28. GRB 120819A: Swift detection of a burst
  29. GRB 120817B: Swift-XRT observations
  30. GRB 120811C: optical observations
  31. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  32. GRB 120815A: MASTER-ICATE observations
  33. Konus-Wind observation of GRB 120816B
  34. Konus-Wind observation of GRB 120817B
  35. GRB 120817A: Swift-XRT refined Analysis
  36. GRB 120817B: LCO Optical Observations
  37. GRB 120817B: Fermi GBM detection
  38. GRB 120817A: Swift-BAT refined analysis
  39. GRB 120816A: optical upper limit
  40. GRB 120817A: Enhanced Swift-XRT position
  41. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  42. GRB 120816A: Bassano Bresciano Observatory optical observations
  43. GRB 120817A: FTN and FTS observations
  44. GRB 120816A: Swift-XRT refined Analysis
  45. GRB 120817A: Swift-XRT observations
  46. GRB 120817A: Swift detection of a burst
  47. GRB 120816A: Enhanced Swift-XRT position
  48. GRB 120816A: Swift-BAT refined analysis
  49. GRB 120816A: BOOTES-2 observations
  50. GRB120816A: OPTIMA discovery of optical counterpart
  51. GRB 120816A: TAROT Calern observatory optical observations
  52. GRB 120816A: ROTSE-III Optical Limits
  53. GRB 120816A: Swift detection of a burst
  54. GRB 120815A: Swift-XRT refined Analysis
  55. GRB 120815A: Swift-BAT refined analysis
  56. GRB 120805A: Liverpool Telescope optical candidate detection
  57. GRB 120815A: Enhanced Swift-XRT position
  58. GRB 120815A: VLT/X-shooter redshift
  59. GRB 120815A: GROND afterglow candidate
  60. GRB 120815A: Swift-XRT observations
  61. GRB 120815A: TAROT La Silla observatory optical observations
  62. GRB 120815A: Swift detection of a burst
  63. GRB 120811B: Fermi GBM observation
  64. GRB 120804A: Possible temporal break in the X-ray light-curve
  65. GCN for GRB 120811C
  66. GRB 120811A: Swift/XRT-UVOT Obseravations
  67. GRB120804A: Chandra observations and afterglow detection
  68. GRB 120805A: optical afterglow confirmation from the NOT
  69. GRB 120805A: Enhanced Swift-XRT position
  70. GRB 120811C: EVLA Observations
  71. GRB 120811C: RTT150 optical observations
  72. GRB 120811C: MASTER-Tunka OT observations
  73. GRB 120811C: Swift-BAT refined analysis
  74. GRB 120811A: Swift-BAT refined analysis
  75. GRB 120811C: NOT redshift
  76. GRB 120811C: Bassano Bresciano Observatory optical observations
  77. GRB 120811C: Swift-XRT refined Analysis
  78. GRB 120811C: Swift/UVOT Detection
  79. GRB 120811C: Redshift from OSIRIS/GTC
  80. Improved IPN error box for short hard GRB 120811B
  81. GRB 120811C: RTT150 optical observations
  82. GRB 120811C: Enhanced Swift-XRT position
  83. GRB 120811C: TAROT Calern observatory optical observations
  84. GRB 120811C: MASTER-Amur observations of fading OT
  85. GRB 120811C: Swift detection of a burst with an optical counterpart
  86. Konus-Wind observation of GRB 120811B
  87. Trigger 530588: Swift detection of XMM J174457-2850.3
  88. Swift Trigger 530581: GRB 120811A or a galactic transient
  89. GRB 120803A: optical upper limit
  90. GRB 120807A: Swift/UVOT Upper Limits
  91. GRB 120803A: Confirmation of the X-ray afterglow
  92. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  93. GRB 120714B: GROND/FORS2 detection of a supernova
  94. Swift Trigger 530441 is a false trigger
  95. GRB 120804A: ATCA 34GHz upper limit
  96. GRB 120807A: Swift-XRT refined Analysis
  97. GRB 120802A: optical observations
  98. GRB 120807A: Fermi/LAT upper limit
  99. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  100. GRB 120807A: TAROT La Silla observatory optical observations

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