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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"

36186 results found.

  1. Swift-BAT trigger 278809 is not a GRB
  2. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  3. GRB 070506: VLT redshift
  4. GRB070506: Swift XRT refined analysis
  5. GRB 070506, Swift-BAT Refined Analysis
  6. GRB 070506: Swift detection of a burst with optical afterglow
  7. GRB 070412, deep LBT imaging
  8. GRB 070429A: Swift XRT further analysis
  9. GRB070429B: VLT observations
  10. GRB 070429A: optical observations
  11. GRB 070309: Swift-XRT afterglow confirmation
  12. GRB070429B: possible host galaxy detection
  13. VLA observation of GRB 070429B
  14. Swift/UVOT observations of GRB070429B
  15. GRB 070429B, Swift-BAT refined analysis
  16. Swift/UVOT observations of GRB070429A
  17. GRB 070429A: Swift XRT refined analysis
  18. GRB 070429A, Swift-BAT refined analysis
  19. GRB 070429A: optical and NIR observations
  20. GRB 070429B: Swift XRT refined analysis
  21. GRB 070429B: ROTSE-III Optical Limits
  22. GRB 070429B: Swift detection of a short burst
  23. GRB 070429: What's the temperature?
  24. GRB 070429: ROTSE-III Optical Limits
  25. GRB 070429: Swift detection of a burst
  26. GRB 070427, Swift-BAT Refined Analysis
  27. LT monitoring of GRB070412
  28. GRB 070427: Swift detection of a burst
  29. GRB 070411, further deep LBT photometry
  30. GRB 070411: Late-time Keck imaging
  31. GRB 070411 : Planned XMM-Newton observation
  32. GRB070419B: Suzaku WAM observation of the prompt emission
  33. GRB 070420, SMARTS optical/IR afterglow observations
  34. GRB 070411, deep LBT photometry
  35. GRB 070420: pseudo-z~1.56 from spectral parameters of the prompt
  36. Konus-Wind observation of GRB 070420
  37. GRB 070411: break in the optical light curve
  38. GRB 070420 Swift-BAT Refined Analysis
  39. GRB070419a: Swift UVOT observations
  40. GRB 070419A: MARGE Observations
  41. GRB 070420: optical rebrightening observed at Mt. John
  42. GRB 070420: Swift XRT refined analysis
  43. GRB 070411: BART early limit
  44. GRB 070420: Faulkes Telescope South Observations
  45. GBR 070419A: Swift/XRT refined analysis
  46. GRB 070420: TAROT La Silla observatory optical observations
  47. GRB 070420: NIR and optical afterglow confirmed
  48. GRB 070420: Swift detection of a burst with optical afterglow
  49. GRB 070419A: MITSuME Okayama Observations
  50. GRB 070419A: Early Super-LOTIS Observations
  51. GRB 070419B, Swift-BAT refined analysis
  52. GRB 070419A Swift-BAT Refined Analysis
  53. GRB 070419A: RAPTOR Detection of Early Emission
  54. GRB 070419B: Swift XRT refined analysis
  55. GRB 070419: Keck/LRIS Absorption Redshift
  56. GRB 070419B: optical afterglow confirmation
  57. GRB 070419A, Optical observations
  58. GRB 070411: Deep VLT detection
  59. GRB070419 - SDSS Pre-Burst Observations
  60. GRB 070419A: SARA observations
  61. GRB 070419A: NAYUTA Optical Observation
  62. GRB 070419A: Faulkes Telescope North Optical Observations
  63. GRB 070419B optical afterglow candidate
  64. GRB 070419A: Optical and IR observations with KANATA
  65. GRB 070419B: optical afterglow candidate
  66. GRB 070419A: Lulin Optical observation
  67. Infrared detection of GRB070419A with UKIRT
  68. GRB 070419A: Kiso Optical observation
  69. GRB070330: Correction to UVOT position
  70. GRB 070419: P60 Confirmation of Optical Afterglow
  71. GRB 070419B: Swift detection of a burst
  72. GRB 070419 optical afterglow candidate
  73. GRB 070419A: ROTSE-III Optical Limits
  74. GRB 070419: Swift detection of a burst
  75. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  76. GRB 070418: Optical and IR observations with KANATA
  77. Trigger 276045: Swift detection of a possible burst
  78. GRB 070406: Swift XRT refined analysis
  79. IBAS Alert n.4202: not a real GRB
  80. GRB 070318, SMARTS optical/IR afterglow observations
  81. GRB 070411: TLS data shows plateau, flares
  82. GRB070412: UKIRT-WFCAM JHK upper limits
  83. GRB070412: Swift UVOT observations
  84. IBAS Alert n.4199: Not a GRB
  85. GRB 070411: Swift/UVOT observations
  86. GRB 070412, Swift-BAT refined analysis
  87. GRB 070412 Liverpool Telescope optical limit
  88. GRB 070411: Optical photometry at Crni Vrh
  89. GRB 070412: Swift-XRT refined analysis
  90. GRB 070411: Swift-XRT refined analysis
  91. GRB 070412: further reanalysis of NOT images
  92. GRB 070412: Optical observations at Crni Vrh
  93. GRB 070411: OA redshift
  94. GRB 070412: Swift-XRT refined position
  95. GRB 070412: further NOT observations
  96. GRB 070412: Gemini/GMOS afterglow candidate
  97. GRB 070412: IAC80 optical afterglow candidate
  98. GRB 070411: Magellan/Clay photometry
  99. GRB 070411: Magellan/IMACS photometry
  100. GRB 070412: NOT observations

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