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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"

15283 results found.

  1. GRB121011A : Xinglong TNT optical observation
  2. GRB 121011A: MITSuME Okayama Optical Observation
  3. GRB 121001A: GROND Afterglow Confirmation
  4. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  5. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  6. GRB 121001A: MASTER optical observations
  7. Swift Trigger 535026: Galactic Transient or possible GRB
  8. GRB 120923A: Correction to GCN 13823
  9. GRB 120923A: JHK Observation
  10. GRB 120923A: MITSuME Okayama Optical upper limits
  11. GRB 120916A Suzaku WAM observation of the prompt emission
  12. GRB 120923A: GROND Upper limits
  13. GRB 120922A: Swift/UVOT Detection
  14. GRB 120923A: Gemini afterglow detection, high-z candidate
  15. GRB 120922A: TAROT La Silla observatory optical observations
  16. GRB 120922A: GROND afterglow candidate
  17. Konus-Wind observation of GRB 120919B
  18. Konus-Wind observation of GRB 120919A
  19. GRB 120916A: Fermi GBM Observation
  20. Konus-Wind observation of GRB 120916A
  21. GRB 120916A: Fermi-LAT detection of a burst
  22. Corrections to the Fermi-LAT upper limits for GRB 120807A, 120908A, 120909A, and 120911A
  23. GRB 120913A: Fermi GBM observation
  24. GRB 120913B: FRAM early follow up and detection
  25. Konus-Wind observation of GRB 120911B
  26. GRB 120911B: Fermi-LAT detection of a burst
  27. GRB 120911A: Fermi GBM observation
  28. GRB 120911A: Fermi/LAT upper limit
  29. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  30. GRB 120908A: Fermi GBM detection
  31. GRB 120909A: TAROT La Silla observatory optical observations
  32. GRB 120909A: Pi of the Sky upper limits
  33. GRB 120909A: Fermi GBM observation
  34. Konus-Wind observation of GRB 120909A
  35. GRB 120909A: GROND detection of the afterglow
  36. GRB 120907A: Fermi GBM detection
  37. GRB 120907A: ROTSE-III Optical Limits
  38. GRB 120802A: optical observations in CrAO
  39. GRB 120830A: Further Swift Observations
  40. GRB 120830A: Fermi GBM observation
  41. Konus-Wind observation of GRB 120830A
  42. IPN Triangulation of short GRB 120830A
  43. GRB 120830A: Fermi-LAT detection of a short burst
  44. GRB 120819A: MASTER final limits
  45. GRB 120819A: MITSuME Ishigakijima upper limits
  46. GRB 120819A: MITSuME Okayama Optical upper limits
  47. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  48. Konus-Wind observation of GRB 120816B
  49. Konus-Wind observation of GRB 120817B
  50. GRB 120817B: Fermi GBM detection
  51. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  52. GRB 120816A: BOOTES-2 observations
  53. GRB 120805A: Liverpool Telescope optical candidate detection
  54. GRB 120815A: VLT/X-shooter redshift
  55. GRB 120811B: Fermi GBM observation
  56. GCN for GRB 120811C
  57. GRB120804A: Chandra observations and afterglow detection
  58. GRB 120805A: Enhanced Swift-XRT position
  59. GRB 120811C: Swift/UVOT Detection
  60. GRB 120811C: MASTER-Amur observations of fading OT
  61. Konus-Wind observation of GRB 120811B
  62. GRB 120803A: Confirmation of the X-ray afterglow
  63. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  64. GRB 120807A: Fermi/LAT upper limit
  65. Fermi/GBM detection of an SGR-like burst
  66. Swift-BAT trigger 529813 is due to noise while entering the SAA
  67. GRB 120728A: Fermi GBM observation
  68. GRB 120804A: GROND upper limits
  69. GRB 120803B: MITSuME Okayama Optical upper limits
  70. GRB 120728B: Fermi GBM detection
  71. Konus-Wind observation of GRB 120728B
  72. GRB 120729A: break in the optical light curve
  73. GRB 120729A: UKIRT Observation
  74. T100 observations of GRB 120729A
  75. GRB 120729A: Swift/UVOT Detection
  76. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
  77. GRB 120728A: GROND observations
  78. GRB 120727A/Galactic source: Fermi-LAT detection of a transient source
  79. GRB 120724A: optical observation in Maidanak observatory
  80. GRB 120709A: Swift re-observation of the field of the X-ray counterpart candidate.
  81. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  82. GRB 120722A: Correction for GCN circ.13500
  83. GRB 120716A: Fermi GBM observation
  84. GRB 120716A: Swift-XRT detection
  85. GRB 120716A: Redshift confirmation from VLT/X-shooter
  86. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  87. GRB 120716A: Optical decay from NOT
  88. Konus-Wind observation of GRB 120716A
  89. GRB 120714B: Swift/UVOT Detection
  90. GRB 120714B: GROND confirmation of fading afterglow
  91. GRB 120714B: Position Correction and Candidate Optical Afterglow
  92. GRB 120711A: INTEGRAL/SPI observations
  93. GRB 120712A: Swift/UVOT Detection
  94. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  95. GRB 120711A: Fermi LAT Detection
  96. Konus-Wind observation of GRB 120711A
  97. GRB 120711A Gemini-S likely redshift
  98. Konus-Wind observation of GRB 120709A
  99. GRB 120711A: REM NIR early time detection
  100. GRB 120711A: MAXI/GSC detection

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