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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"

28115 results found.

  1. GRB 070420, SMARTS optical/IR afterglow observations
  2. GRB 070411, deep LBT photometry
  3. GRB 070411: break in the optical light curve
  4. GRB070419A: Kuiper Optical detection
  5. GRB070419a: Swift UVOT observations
  6. GRB 070420: optical rebrightening observed at Mt. John
  7. GRB 070420: Swift XRT refined analysis
  8. GRB070420: Swift UVOT continuing observations
  9. GBR 070419A: Swift/XRT refined analysis
  10. GRB 070420: TAROT La Silla observatory optical observations
  11. GRB 070420: NIR and optical afterglow confirmed
  12. GRB 070420: Swift detection of a burst with optical afterglow
  13. GRB 070419A: MITSuME Okayama Observations
  14. GRB 070419A: Early Super-LOTIS Observations
  15. GRB 070419A Swift-BAT Refined Analysis
  16. GRB 070419A: RAPTOR Detection of Early Emission
  17. GRB 070419B: Swift XRT refined analysis
  18. GRB 070419: Keck/LRIS Absorption Redshift
  19. GRB 070419B: optical afterglow confirmation
  20. GRB 070419A, Optical observations
  21. GRB 070411: Deep VLT detection
  22. GRB 070419A: SARA observations
  23. GRB 070419A: NAYUTA Optical Observation
  24. GRB 070419B optical afterglow candidate
  25. GRB 070419B: optical afterglow candidate
  26. GRB 070419A: Lulin Optical observation
  27. Infrared detection of GRB070419A with UKIRT
  28. GRB 070419A: Kiso Optical observation
  29. GRB070330: Correction to UVOT position
  30. GRB 070419: P60 Confirmation of Optical Afterglow
  31. GRB 070419B: Swift detection of a burst
  32. GRB 070419 optical afterglow candidate
  33. GRB 070419A: ROTSE-III Optical Limits
  34. GRB 070419: Swift detection of a burst
  35. Trigger 276045: Swift detection of a possible burst
  36. GRB 070406: Swift XRT refined analysis
  37. GRB 070318, SMARTS optical/IR afterglow observations
  38. GRB 070411: TLS data shows plateau, flares
  39. GRB070412: UKIRT-WFCAM JHK upper limits
  40. GRB070412: Swift UVOT observations
  41. GRB 070411: Swift/UVOT observations
  42. GRB 070412 Liverpool Telescope optical limit
  43. GRB 070412: Swift-XRT refined analysis
  44. GRB 070411: Swift-XRT refined analysis
  45. GRB 070412: further reanalysis of NOT images
  46. GRB 070411: OA redshift
  47. GRB 070412: Swift-XRT refined position
  48. GRB 070412: further NOT observations
  49. GRB 070412: Gemini/GMOS afterglow candidate
  50. GRB 070412: IAC80 optical afterglow candidate
  51. GRB 070411: Magellan/Clay photometry
  52. GRB 070411: Magellan/IMACS photometry
  53. GRB 070412: NOT observations
  54. GRB 070412: Nearby bright galaxy
  55. GRB 070412: Swift detection of a burst
  56. GRB 070411: IAC80 optical observations
  57. GRB 070411: Optical observations at Crni Vrh
  58. GRB 070411: ROTSE-III Detection of Optical Counterpart
  59. GRB 070411: Tautenburg RRM Afterglow Confirmation
  60. GRB 070411: Swift detection of a burst with optical afterglow
  61. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  62. GRB 070406: Swift XRT team further analysis
  63. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  64. GRB 070406: Bright galaxy in XRT error circle is a quasar
  65. GRB 070406: Gemini South Imaging and XRT analysis
  66. GRB070406: Swift UVOT observations
  67. GRB 070406: further analysis of NOT images.
  68. Short GRB 070406 - Possible Bright Host Galaxy
  69. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  70. GRB 070406: NOT observations
  71. GRB 070406: Swift detection of a burst
  72. GRB 070311, deep optical photometry
  73. UVOT observations of GRB070330
  74. GRB 070330, SMARTS optical/IR observations
  75. GRB 070330: TAROT La Silla observatory optical observations
  76. GRB 070330: Swift-XRT refined analysis
  77. GRB 070330: Swift detection of a burst
  78. GRB 070328: Swift/UVOT Upper Limits
  79. GRB 070328: Swift/XRT Refined Analysis
  80. GRB 070328: Swift detection of a burst
  81. GRB070220: optical observations
  82. GRB070208: optical observations
  83. GRB070223: confirmation of nIR and optical afterglow
  84. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  85. GRB 070311, deep optical photometry
  86. GRB 070318: Gemini + Magellan spectra
  87. GRB070318: Swift UVOT continuing observations
  88. GRB070318: Swift-XRT refined analysis
  89. GRB 070318: Swift/UVOT Continued Observations
  90. GRB 070318: Swift detection of a burst with an optical afterglow
  91. GRB 070311: Late Central Engine Activity Optical Flare??
  92. GRB 070311: MDM Optical Monitoring
  93. VLA observation of GRB 070311
  94. GRB 070311: Tautenburg sees afterglow fading
  95. GRB 070311: Optical observation.
  96. GRB 070311: Optical Brightening
  97. GRB 070311: SARA upper limit
  98. GRB 070309: variability of the XRT afterglow candidate
  99. GRB 070311: MDM Optical Follow-up
  100. GRB 070311: RAPTOR Detection of Optical Emission

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