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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"

37691 results found.

  1. GRB 070508: Optical observation limiting magnitude
  2. GRB 070508: Optical afterglow detection
  3. GRB 070508: REM observations
  4. GRB 070508: TAROT La Silla observatory optical observations
  5. GRB 070508: Swift detection of an intense burst with an optical counterpart
  6. Swift-BAT trigger 278809 is not a GRB
  7. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  8. GRB 070506: VLT redshift
  9. GRB070506: Swift XRT refined analysis
  10. GRB 070506, Swift-BAT Refined Analysis
  11. GRB 070506: Swift detection of a burst with optical afterglow
  12. GRB 070412, deep LBT imaging
  13. GRB 070429A: Swift XRT further analysis
  14. GRB070429B: VLT observations
  15. GRB 070429A: optical observations
  16. GRB 070309: Swift-XRT afterglow confirmation
  17. GRB070429B: possible host galaxy detection
  18. VLA observation of GRB 070429B
  19. Swift/UVOT observations of GRB070429B
  20. GRB 070429B, Swift-BAT refined analysis
  21. Swift/UVOT observations of GRB070429A
  22. GRB 070429A: Swift XRT refined analysis
  23. GRB 070429A, Swift-BAT refined analysis
  24. GRB 070429A: optical and NIR observations
  25. GRB 070429B: Swift XRT refined analysis
  26. GRB 070429B: ROTSE-III Optical Limits
  27. GRB 070429B: Swift detection of a short burst
  28. GRB 070429: What's the temperature?
  29. GRB 070429: ROTSE-III Optical Limits
  30. GRB 070429: Swift detection of a burst
  31. GRB 070427, Swift-BAT Refined Analysis
  32. LT monitoring of GRB070412
  33. GRB 070427: Swift detection of a burst
  34. GRB 070411, further deep LBT photometry
  35. GRB 070411: Late-time Keck imaging
  36. GRB 070411 : Planned XMM-Newton observation
  37. GRB070419B: Suzaku WAM observation of the prompt emission
  38. GRB 070420, SMARTS optical/IR afterglow observations
  39. GRB 070411, deep LBT photometry
  40. GRB 070420: pseudo-z~1.56 from spectral parameters of the prompt
  41. Konus-Wind observation of GRB 070420
  42. GRB 070411: break in the optical light curve
  43. GRB 070420 Swift-BAT Refined Analysis
  44. GRB070419a: Swift UVOT observations
  45. GRB 070419A: MARGE Observations
  46. GRB 070420: optical rebrightening observed at Mt. John
  47. GRB 070420: Swift XRT refined analysis
  48. GRB 070411: BART early limit
  49. GRB 070420: Faulkes Telescope South Observations
  50. GBR 070419A: Swift/XRT refined analysis
  51. GRB 070420: TAROT La Silla observatory optical observations
  52. GRB 070420: NIR and optical afterglow confirmed
  53. GRB 070420: Swift detection of a burst with optical afterglow
  54. GRB 070419A: MITSuME Okayama Observations
  55. GRB 070419A: Early Super-LOTIS Observations
  56. GRB 070419B, Swift-BAT refined analysis
  57. GRB 070419A Swift-BAT Refined Analysis
  58. GRB 070419A: RAPTOR Detection of Early Emission
  59. GRB 070419B: Swift XRT refined analysis
  60. GRB 070419: Keck/LRIS Absorption Redshift
  61. GRB 070419B: optical afterglow confirmation
  62. GRB 070419A, Optical observations
  63. GRB 070411: Deep VLT detection
  64. GRB070419 - SDSS Pre-Burst Observations
  65. GRB 070419A: SARA observations
  66. GRB 070419A: NAYUTA Optical Observation
  67. GRB 070419A: Faulkes Telescope North Optical Observations
  68. GRB 070419B optical afterglow candidate
  69. GRB 070419A: Optical and IR observations with KANATA
  70. GRB 070419B: optical afterglow candidate
  71. GRB 070419A: Lulin Optical observation
  72. Infrared detection of GRB070419A with UKIRT
  73. GRB 070419A: Kiso Optical observation
  74. GRB070330: Correction to UVOT position
  75. GRB 070419: P60 Confirmation of Optical Afterglow
  76. GRB 070419B: Swift detection of a burst
  77. GRB 070419 optical afterglow candidate
  78. GRB 070419A: ROTSE-III Optical Limits
  79. GRB 070419: Swift detection of a burst
  80. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  81. GRB 070418: Optical and IR observations with KANATA
  82. Trigger 276045: Swift detection of a possible burst
  83. GRB 070406: Swift XRT refined analysis
  84. IBAS Alert n.4202: not a real GRB
  85. GRB 070318, SMARTS optical/IR afterglow observations
  86. GRB 070411: TLS data shows plateau, flares
  87. GRB070412: UKIRT-WFCAM JHK upper limits
  88. GRB070412: Swift UVOT observations
  89. IBAS Alert n.4199: Not a GRB
  90. GRB 070411: Swift/UVOT observations
  91. GRB 070412, Swift-BAT refined analysis
  92. GRB 070412 Liverpool Telescope optical limit
  93. GRB 070411: Optical photometry at Crni Vrh
  94. GRB 070412: Swift-XRT refined analysis
  95. GRB 070411: Swift-XRT refined analysis
  96. GRB 070412: further reanalysis of NOT images
  97. GRB 070412: Optical observations at Crni Vrh
  98. GRB 070411: OA redshift
  99. GRB 070412: Swift-XRT refined position
  100. GRB 070412: further NOT observations

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