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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"

18365 results found.

  1. GRB070518: UVOT refined analysis
  2. GRB 070518: OT confirmed form Xinglong TNT observation
  3. GRB 070518: Swift detection of a burst with optical afterglow
  4. GRB 070517: Swift detection of a burst
  5. GRB 070509: objects inside XRT error circle
  6. GRB 070512: IPN localization and Konus spectrum of a bright burst
  7. GRB 070509: Swift/UVOT Upper Limits
  8. GRB 070509: REM observations
  9. GRB 070508: REM observations
  10. GRB 070508: TAROT La Silla observatory optical observations
  11. GRB 070508: Swift detection of an intense burst with an optical counterpart
  12. GRB070412: MAGIC telescope GeV observation
  13. GRB070506: Swift/UVOT Observations
  14. GRB 070506: Swift detection of a burst with optical afterglow
  15. GRB070429B: VLT observations
  16. GRB070429B: position correction
  17. GRB 070309: Swift-XRT afterglow confirmation
  18. VLA observation of GRB 070429B
  19. Swift/UVOT observations of GRB070429B
  20. Swift/UVOT observations of GRB070429A
  21. GRB 070429A: optical and NIR observations
  22. GRB 070429B: ROTSE-III Optical Limits
  23. GRB 070429: ROTSE-III Optical Limits
  24. GRB 070429: Swift detection of a burst
  25. LT monitoring of GRB070412
  26. GRB 070411: Late-time Keck imaging
  27. GRB070420: Swift UVOT continuing observations
  28. GRB 070420: Faulkes Telescope South Observations
  29. GBR 070419A: Swift/XRT refined analysis
  30. GRB 070420: TAROT La Silla observatory optical observations
  31. GRB 070420: NIR and optical afterglow confirmed
  32. GRB 070420: Swift detection of a burst with optical afterglow
  33. GRB 070419A: MITSuME Okayama Observations
  34. GRB070419 - SDSS Pre-Burst Observations
  35. GRB 070419A: SARA observations
  36. GRB 070419A: NAYUTA Optical Observation
  37. GRB 070419A: Optical and IR observations with KANATA
  38. GRB070419A, optical observation
  39. Infrared detection of GRB070419A with UKIRT
  40. GRB 070419A: Kiso Optical observation
  41. GRB 070419: P60 Confirmation of Optical Afterglow
  42. GRB 070419B: Swift detection of a burst
  43. GRB 070419A: ROTSE-III Optical Limits
  44. GRB 070419: Swift detection of a burst
  45. GRB 070418: Optical and IR observations with KANATA
  46. Trigger 276045: Swift detection of a possible burst
  47. GRB 070406: Swift XRT refined analysis
  48. GRB070412: UKIRT-WFCAM JHK upper limits
  49. GRB070412: Swift UVOT observations
  50. GRB 070411: Swift/UVOT observations
  51. GRB 070412, Swift-BAT refined analysis
  52. GRB 070412 Liverpool Telescope optical limit
  53. GRB 070412: Optical observations at Crni Vrh
  54. GRB 070412: further NOT observations
  55. GRB 070412: IAC80 optical afterglow candidate
  56. GRB 070412: NOT observations
  57. GRB 070412: Swift detection of a burst
  58. GRB 070411: IAC80 optical observations
  59. GRB 070411 : Liverpool Telescope Observations
  60. GRB 070411: Swift detection of a burst with optical afterglow
  61. GRB 070406: Swift XRT team further analysis
  62. Suzaku ToO observation of SGR 1806-20
  63. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  64. GRB 070406: Correction to the optical candidate in GCN6253
  65. GRB 070406: Gemini South Imaging and XRT analysis
  66. GRB070406: Swift UVOT observations
  67. GRB 070406: NOT observations
  68. GRB 070406: SARA upper limit
  69. GRB 070406: Xinglong TNT optical Upper Limit
  70. GRB 070311, deep optical photometry
  71. UVOT observations of GRB070330
  72. GRB 070330: TAROT La Silla observatory optical observations
  73. GRB 070330 - Watcher Observations
  74. GRB 070328: Swift/UVOT Upper Limits
  75. GRB 070328 : Suzaku ToO follow up starts
  76. GRB 070328: Swift detection of a burst
  77. GRB 070311, deep optical photometry
  78. Short-Hard GRB 070209: PROMPT Observations
  79. GRB 070318: absorption-line redshift
  80. GRB070318: Swift UVOT continuing observations
  81. GRB070318: Swift-XRT refined analysis
  82. GRB 070318: Swift detection of a burst with an optical afterglow
  83. VLA observation of GRB 070311
  84. GRB 070311: Optical observation.
  85. GRB 070306: possible emission-line redshift
  86. GRB 070311: SARA upper limit
  87. GRB070311: FRAM early follow-up limit
  88. GRB 070311: P60 Observations
  89. GRB 070311: Swift/UVOT Upper Limits
  90. GRB 070311: MITSuME Okayama Optical Observation
  91. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  92. GRB 070311: REM candidate afterglow
  93. GRB060901: Candidate optical afterglow
  94. GRB 070125: Chandra X-ray Confirmation of Jet Break
  95. GRB 070309: Swift/UVOT Upper Limits
  96. GRB 070306, optical observation
  97. Swift UVOT Finding Charts for GRB 070309
  98. GRB 070309: A long GRB detected by INTEGRAL
  99. VLA observation of GRB 070306
  100. GRB 070306: NOT observations

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