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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"

20485 results found.

  1. VLA observation of GRB 070429B
  2. Swift/UVOT observations of GRB070429B
  3. Swift/UVOT observations of GRB070429A
  4. GRB 070429A: optical and NIR observations
  5. GRB 070429B: ROTSE-III Optical Limits
  6. GRB 070429: ROTSE-III Optical Limits
  7. GRB 070429: Swift detection of a burst
  8. LT monitoring of GRB070412
  9. GRB 070427: Swift detection of a burst
  10. GRB 070411: Late-time Keck imaging
  11. GRB070419B: Suzaku WAM observation of the prompt emission
  12. Konus-Wind observation of GRB 070420
  13. GRB 070420 Swift-BAT Refined Analysis
  14. GRB070420: Swift UVOT continuing observations
  15. GRB 070420: Faulkes Telescope South Observations
  16. GBR 070419A: Swift/XRT refined analysis
  17. GRB 070420: TAROT La Silla observatory optical observations
  18. GRB 070420: NIR and optical afterglow confirmed
  19. GRB 070420: Swift detection of a burst with optical afterglow
  20. GRB 070419A: MITSuME Okayama Observations
  21. GRB 070419A: Early Super-LOTIS Observations
  22. GRB070419 - SDSS Pre-Burst Observations
  23. GRB 070419A: SARA observations
  24. GRB 070419A: NAYUTA Optical Observation
  25. GRB 070419A: Optical and IR observations with KANATA
  26. GRB070419A, optical observation
  27. Infrared detection of GRB070419A with UKIRT
  28. GRB 070419A: Kiso Optical observation
  29. GRB 070419: P60 Confirmation of Optical Afterglow
  30. GRB 070419B: Swift detection of a burst
  31. GRB 070419A: ROTSE-III Optical Limits
  32. GRB 070419: Swift detection of a burst
  33. GRB 070418: Optical and IR observations with KANATA
  34. Trigger 276045: Swift detection of a possible burst
  35. GRB 070406: Swift XRT refined analysis
  36. GRB070412: UKIRT-WFCAM JHK upper limits
  37. GRB070412: Swift UVOT observations
  38. GRB 070411: Swift/UVOT observations
  39. GRB 070412, Swift-BAT refined analysis
  40. GRB 070412 Liverpool Telescope optical limit
  41. GRB 070412: Optical observations at Crni Vrh
  42. GRB 070412: further NOT observations
  43. GRB 070412: IAC80 optical afterglow candidate
  44. GRB 070412: NOT observations
  45. GRB 070411, Swift-BAT refined analysis
  46. GRB 070412: Swift detection of a burst
  47. GRB 070411: IAC80 optical observations
  48. GRB 070411 : Liverpool Telescope Observations
  49. GRB 070411: Tautenburg RRM Afterglow Confirmation
  50. GRB 070411: Swift detection of a burst with optical afterglow
  51. GRB 070406: Swift XRT team further analysis
  52. Suzaku ToO observation of SGR 1806-20
  53. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  54. GRB 070406: Correction to the optical candidate in GCN6253
  55. GRB 070406: Gemini South Imaging and XRT analysis
  56. GRB070406: Swift UVOT observations
  57. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  58. GRB 070406: NOT observations
  59. GRB 070406: SARA upper limit
  60. GRB 070406: Xinglong TNT optical Upper Limit
  61. GRB 070402: Suzaku WAM observation of the prompt emission
  62. Konus-Wind and Konus-A observations of GRB 070402
  63. IPN triangulation of GRB070402
  64. GRB 070328: Suzaku WAM observation of the prompt emission
  65. UVOT observations of GRB070330
  66. GRB 070330: TAROT La Silla observatory optical observations
  67. GRB 070330 - Watcher Observations
  68. Konus-Wind observation of GRB 070328
  69. GRB 070328: Swift/UVOT Upper Limits
  70. long burst from SGR 1806-20 detected on March 26
  71. GRB 070328 : Suzaku ToO follow up starts
  72. GRB 070328, Swift-BAT refined analysis
  73. GRB 070328: Swift detection of a burst
  74. GRB 070311, deep optical photometry
  75. Short-Hard GRB 070209: PROMPT Observations
  76. GRB 070318: absorption-line redshift
  77. GRB070318: Swift UVOT continuing observations
  78. GRB 070318: Swift detection of a burst with an optical afterglow
  79. VLA observation of GRB 070311
  80. GRB 070311: Optical observation.
  81. GRB 070306: possible emission-line redshift
  82. GRB 070311: SARA upper limit
  83. GRB 070309: variability of the XRT afterglow candidate
  84. GRB070311: FRAM early follow-up limit
  85. GRB 070311: P60 Observations
  86. GRB 070311: Swift/UVOT Upper Limits
  87. GRB 070311: MITSuME Okayama Optical Observation
  88. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  89. GRB 070311: REM candidate afterglow
  90. GRB060901: Candidate optical afterglow
  91. GRB070309: Swift/XRT possible afterglow detection
  92. GRB 070125: Chandra X-ray Confirmation of Jet Break
  93. GRB 070309: Swift/UVOT Upper Limits
  94. GRB 070306, optical observation
  95. Swift UVOT Finding Charts for GRB 070309
  96. VLA observation of GRB 070306
  97. GRB 070306: NOT observations
  98. GRB 070306 Swift/UVOT refined analysis
  99. GRB 070306: IR observations and candidate afterglow
  100. GRB 070306: Optical and IR observations with KANATA

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