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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"

32551 results found.

  1. GRB 070520B: Swift-XRT refined analysis
  2. GRB070521: P200 Observations
  3. GRB070521 : Faulkes Telescope North Observations
  4. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  5. GRB 070520A: MITSuME Akeno optical upper limits
  6. GRB 070520B, Swift-BAT refined analysis
  7. GRB 070520A, Swift-BAT refined analysis
  8. GRB 070520A: Swift-XRT refined analysis
  9. GRB 070518: TNG observations
  10. GRB 070520: Xinglong EST optical Upper Limit
  11. VLA observation of GRB 070518
  12. GRB 070518: Swift-XRT refined analysis
  13. GRB 070517: Gemini optical imaging
  14. GRB070518: UVOT refined analysis
  15. GRB 070518, Swift-BAT refined analysis
  16. GRB 070518: OT confirmed form Xinglong TNT observation
  17. GRB070517: Swift-XRT Refined Analysis
  18. GRB 070517, Swift-BAT refined analysis
  19. GRB 070509: objects inside XRT error circle
  20. GRB070419A: optical observations
  21. GRB 070419A, Deep LBT photometry
  22. GRB 070509: Swift/UVOT Upper Limits
  23. Konus-Wind and Konus-A observation of GRB 070508
  24. Swift-BAT trigger 278987 is not a GRB
  25. GRB070509: Swift-XRT Refined Analysis
  26. RHESSI Spectrum of GRB070508
  27. GRB 070508: OA fading and tentative redshift
  28. GRB 070509, Swift-BAT refined analysis
  29. GRB 070508: Suzaku/WAM observation of the prompt emission
  30. GRB 070509: REM observations
  31. GRB 070509: ROTSE-III Optical Limits
  32. GRB070508: Swift/UVOT Observations
  33. GRB 070508, SMARTS optical afterglow observation
  34. GRB 070508, Swift-BAT refined analysis
  35. GRB 070508: Multicolor optical observations and possible redshift limit
  36. GRB 070508: Swift-XRT refined analysis
  37. GRB 070508: Optical observation limiting magnitude
  38. GRB 070508: Optical afterglow detection
  39. GRB 070508: REM observations
  40. GRB070412: MAGIC telescope GeV observation
  41. Swift-BAT trigger 278809 is not a GRB
  42. GRB 070506: VLT redshift
  43. GRB070506: Swift/UVOT Observations
  44. GRB070506: Swift XRT refined analysis
  45. GRB 070506, Swift-BAT Refined Analysis
  46. GRB 070412, deep LBT imaging
  47. GRB 070429A: Swift XRT further analysis
  48. GRB070429B: VLT observations
  49. GRB 070429A: optical observations
  50. GRB070429B: position correction
  51. GRB 070309: Swift-XRT afterglow confirmation
  52. GRB070429B: possible host galaxy detection
  53. VLA observation of GRB 070429B
  54. Swift/UVOT observations of GRB070429B
  55. GRB 070429B, Swift-BAT refined analysis
  56. Swift/UVOT observations of GRB070429A
  57. GRB 070429A: Swift XRT refined analysis
  58. GRB 070429A, Swift-BAT refined analysis
  59. GRB 070429B: Swift XRT refined analysis
  60. GRB 070429B: ROTSE-III Optical Limits
  61. GRB 070429: ROTSE-III Optical Limits
  62. GRB 070427, Swift-BAT Refined Analysis
  63. LT monitoring of GRB070412
  64. GRB 070411, further deep LBT photometry
  65. GRB 070411: Late-time Keck imaging
  66. GRB070419B: Suzaku WAM observation of the prompt emission
  67. GRB 070420, SMARTS optical/IR afterglow observations
  68. GRB 070411, deep LBT photometry
  69. Konus-Wind observation of GRB 070420
  70. GRB 070411: break in the optical light curve
  71. GRB 070420 Swift-BAT Refined Analysis
  72. GRB070419A: Kuiper Optical detection
  73. GRB070419a: Swift UVOT observations
  74. GRB 070419A: MARGE Observations
  75. GRB 070420: optical rebrightening observed at Mt. John
  76. GRB 070420: Swift XRT refined analysis
  77. GRB070420: Swift UVOT continuing observations
  78. GRB 070411: BART early limit
  79. GRB 070420: Faulkes Telescope South Observations
  80. GBR 070419A: Swift/XRT refined analysis
  81. GRB 070420: NIR and optical afterglow confirmed
  82. GRB 070419A: MITSuME Okayama Observations
  83. GRB 070419A: Early Super-LOTIS Observations
  84. GRB 070419B, Swift-BAT refined analysis
  85. GRB 070419A Swift-BAT Refined Analysis
  86. GRB070419B: Confirmation of Optical Transient
  87. GRB 070419A: RAPTOR Detection of Early Emission
  88. GRB 070419B: Swift XRT refined analysis
  89. GRB 070419: Keck/LRIS Absorption Redshift
  90. GRB 070419A, Optical observations
  91. GRB 070411: Deep VLT detection
  92. GRB 070419A: SARA observations
  93. GRB 070419A: NAYUTA Optical Observation
  94. GRB 070419A: Faulkes Telescope North Optical Observations
  95. GRB 070419B optical afterglow candidate
  96. GRB 070419A: Optical and IR observations with KANATA
  97. GRB 070419B: optical afterglow candidate
  98. GRB070419A, optical observation
  99. Infrared detection of GRB070419A with UKIRT
  100. GRB070330: Correction to UVOT position

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