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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"

21092 results found.

  1. GRB081121: Swift/UVOT observations
  2. GRB 081121: Swift detection of a burst
  3. GRB 081121: ROTSE-III Detection of Optical Counterpart
  4. GRB 081016b, SMARTS optical/IR observations
  5. GRB 081118: GROND detection of afterglow
  6. GRB 081118: Swift UVOT Upper Limits
  7. GRB 081109A: confirmation of possible detection host galaxy
  8. Further Swift-XRT observations of the probable GRB 081105.
  9. GRB 081102: RTT150 Optical observations
  10. GRB 081110: MASTER: first optical observations Fermi GRB
  11. GRB 081109: TAROT La Silla observatory optical observations
  12. GRB 081024B: Swift-XRT late-time observations
  13. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  14. GRB 081109A: Possible Swift-UVOT detection
  15. GRB 081109A: Faulkes Telescope South observations
  16. GRB 081109A optical upper limit
  17. GRB 081109: REM NIR afterglow detection
  18. GRB 081028 - PAIRITEL NIR detection
  19. GRB 081104: GROND found no Optical/NIR Afterglow
  20. GRB 081105: GROND Upper Limits
  21. GRB 081105: Observations from OSN
  22. UVOT/Swift observations of GRB081105
  23. Swift-XRT observations of GRB 081105
  24. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  25. GRB081104: Swift/UVOT Upper Limits
  26. GRB 081104 : Faulkes Telescope South observations
  27. GRB 081102: OPTIMA-Burst optical upper limit
  28. SGR 0501+4516: optical observations in August
  29. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  30. GRB 081024B: BTA deep optical observations
  31. GRB 081028: CrAO optical observations
  32. GRB 081024B: new Swift-XRT observations
  33. GRB 081029, SMARTS optical/IR afterglow observations
  34. GRB 081029: UVOT Detection of the Optical Afterglow
  35. GRB 081029: Redshift Confirmation from Gemini-South
  36. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  37. GRB 081029: REM observations
  38. GRB 081029: UVES/VLT Absorption Redshift
  39. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  40. GRB 081029: ROTSE-III Detection of Optical Counterpart
  41. GRB 081028: Magellan redshift
  42. GRB081028: UVOT detection of a brightening afterglow
  43. Swift UVOT observations of GRB081028
  44. GRB 081028: TAROT Calern observatory optical observations
  45. GRB 081028: optical observations at the NOT
  46. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  47. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  48. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  49. GRB 081025: TLS upper limits
  50. GRB081025: RTT150 optical observations
  51. GRB081024B: P200 Observations
  52. GRB 081024B: Swift-XRT further observations
  53. Swift UVOT observations of GRB081025
  54. Swift UVOT observations of GRB081024B
  55. GRB 081024B: Swift-XRT observations
  56. Swift UVOT observations of GRB 081024
  57. GRB 081024: Faulkes Telescope North optical observations
  58. GRB 081024: Early Super-LOTIS Observations
  59. GRB 081017: REM early observations
  60. GRB 081016B: Swift/UVOT Upper Limits
  61. GRB 081011: Swift XRT refined analysis
  62. GRB 081016: Swift-XRT candidate afterglow detection
  63. GRB 081012: GROND upper limits
  64. GRB 081008: Galaxy associated with z=1.967 absorber
  65. GRB 080430: optical observations
  66. GRB 081008 optical upper limit
  67. GRB 081012: Observations from NOT
  68. GRB 081012: Swift/UVOT analysis of initial observations
  69. GRB 081012: Swift/XRT detection
  70. GRB 081012: ROTSE-III Optical Limits
  71. GRB 081011: Swift/XRT detection
  72. GRB 081008, SMARTS optical/IR afterglow observations
  73. GRB 081007: Radio Detection
  74. GRB081008: Swift/UVOT observations
  75. GRB 081008: Gemini-South Absorption Redshiftt
  76. GRB 081008: VLT/FORS2 spectroscopy
  77. GRB 081008: ROTSE-III Detection of Optical Counterpart
  78. GRB081007: Swift/UVOT Observations
  79. GRB 081007, SMARTS optical afterglow observations
  80. GRB 081007: Early RAPTOR measurements of optical counterpart
  81. GRB 081007, Faulkes Telescope North optical observations
  82. GRB 081007, SMARTS optical/IR afterglow observations
  83. GRB 081007: REM NIR and optical counterpart
  84. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  85. GRB 081003B: TAROT Calern observatory optical observations
  86. GRB 081003A: OSN optical observations
  87. GRB 081001: Further observations from OSN
  88. GRB 081001: Observations from OSN
  89. GRB 081001: Swift UVOT Observations
  90. GRB 080928: Watcher observations
  91. GRB080928: Gemini-South Absorption Redshift
  92. GRB 080928: Swift/UVOT observations
  93. GRB 080928: GROND DETECTION
  94. GRB 080928, Swift-BAT initial refined analysis
  95. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  96. Swift trigger 325707: Swift/UVOT Upper Limits
  97. GRB 080916C: GROND Confirmation of the Optical Afterglow
  98. GRB 080916C: GROND Confirmation of the Optical Afterglow
  99. GRB 080919: REM NIR observations
  100. GRB 080915A: GROND upper limits

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