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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

22112 results found.

  1. GRB 070508: TAROT La Silla observatory optical observations
  2. GRB 070508: Swift detection of an intense burst with an optical counterpart
  3. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  4. GRB070506: Swift/UVOT Observations
  5. GRB 070506: Swift detection of a burst with optical afterglow
  6. GRB 070412, deep LBT imaging
  7. GRB070429B: VLT observations
  8. GRB070429B: position correction
  9. GRB 070309: Swift-XRT afterglow confirmation
  10. VLA observation of GRB 070429B
  11. Swift/UVOT observations of GRB070429B
  12. GRB 070429B, Swift-BAT refined analysis
  13. Swift/UVOT observations of GRB070429A
  14. GRB 070429A: optical and NIR observations
  15. GRB 070429B: ROTSE-III Optical Limits
  16. GRB 070429B: Swift detection of a short burst
  17. GRB 070429: ROTSE-III Optical Limits
  18. GRB 070429: Swift detection of a burst
  19. LT monitoring of GRB070412
  20. GRB 070427: Swift detection of a burst
  21. GRB 070411, further deep LBT photometry
  22. GRB 070411: Late-time Keck imaging
  23. GRB070419a: Swift UVOT observations
  24. GRB 070420: Swift XRT refined analysis
  25. GRB070420: Swift UVOT continuing observations
  26. GRB 070420: Faulkes Telescope South Observations
  27. GRB 070420: TAROT La Silla observatory optical observations
  28. GRB 070420: NIR and optical afterglow confirmed
  29. GRB 070420: Swift detection of a burst with optical afterglow
  30. GRB 070419A: MITSuME Okayama Observations
  31. GRB 070419B: Swift XRT refined analysis
  32. GRB070419 - SDSS Pre-Burst Observations
  33. GRB 070419A: SARA observations
  34. GRB 070419A: NAYUTA Optical Observation
  35. GRB 070419A: Optical and IR observations with KANATA
  36. GRB070419A, optical observation
  37. Infrared detection of GRB070419A with UKIRT
  38. GRB 070419A: Kiso Optical observation
  39. GRB 070419: P60 Confirmation of Optical Afterglow
  40. GRB 070419B: Swift detection of a burst
  41. GRB 070419A: ROTSE-III Optical Limits
  42. GRB 070419: Swift detection of a burst
  43. GRB 070418: Optical and IR observations with KANATA
  44. Trigger 276045: Swift detection of a possible burst
  45. GRB 070406: Swift XRT refined analysis
  46. GRB 070318, SMARTS optical/IR afterglow observations
  47. GRB070412: UKIRT-WFCAM JHK upper limits
  48. GRB070412: Swift UVOT observations
  49. GRB 070411: Swift/UVOT observations
  50. GRB 070412, Swift-BAT refined analysis
  51. GRB 070412 Liverpool Telescope optical limit
  52. GRB 070411: Optical photometry at Crni Vrh
  53. GRB 070412: Swift-XRT refined analysis
  54. GRB 070412: Optical observations at Crni Vrh
  55. GRB 070412: further NOT observations
  56. GRB 070412: IAC80 optical afterglow candidate
  57. GRB 070412: NOT observations
  58. GRB 070411, Swift-BAT refined analysis
  59. GRB 070412: Swift detection of a burst
  60. GRB 070411: IAC80 optical observations
  61. GRB 070411 : Liverpool Telescope Observations
  62. GRB 070411: Swift detection of a burst with optical afterglow
  63. GRB 070406: Swift XRT team further analysis
  64. Suzaku ToO observation of SGR 1806-20
  65. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  66. GRB 070406: Correction to the optical candidate in GCN6253
  67. GRB 070406: Gemini South Imaging and XRT analysis
  68. GRB070406: Swift UVOT observations
  69. Short GRB 070406 - Possible Bright Host Galaxy
  70. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  71. GRB 070406: NOT observations
  72. GRB 070406: SARA upper limit
  73. GRB 070406: Xinglong TNT optical Upper Limit
  74. GRB 070406: Swift detection of a burst
  75. GRB 070402: Suzaku WAM observation of the prompt emission
  76. Konus-Wind and Konus-A observations of GRB 070402
  77. IPN triangulation of GRB070402
  78. GRB 070328: Suzaku WAM observation of the prompt emission
  79. UVOT observations of GRB070330
  80. GRB 070330: TAROT La Silla observatory optical observations
  81. GRB 070330: Swift-XRT refined analysis
  82. GRB 070330 - Watcher Observations
  83. GRB 070330: Swift detection of a burst
  84. GRB 070328: Swift/UVOT Upper Limits
  85. long burst from SGR 1806-20 detected on March 26
  86. GRB 070328 : Suzaku ToO follow up starts
  87. GRB 070328: Swift detection of a burst
  88. GRB 070311, deep optical photometry
  89. Short-Hard GRB 070209: PROMPT Observations
  90. GRB 070318: absorption-line redshift
  91. GRB070318: Swift UVOT continuing observations
  92. GRB070318: Swift-XRT refined analysis
  93. GRB 070318, Swift-BAT refined analysis
  94. GRB 070318: Swift detection of a burst with an optical afterglow
  95. VLA observation of GRB 070311
  96. GRB 070311: Optical observation.
  97. GRB 070306: possible emission-line redshift
  98. GRB 070311: SARA upper limit
  99. GRB 070311: RAPTOR Detection of Optical Emission
  100. GRB070311: FRAM early follow-up limit

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