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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"

28107 results found.

  1. GBR 070419A: Swift/XRT refined analysis
  2. GRB 070420: TAROT La Silla observatory optical observations
  3. GRB 070420: NIR and optical afterglow confirmed
  4. GRB 070420: Swift detection of a burst with optical afterglow
  5. GRB 070419A: MITSuME Okayama Observations
  6. GRB 070419A: Early Super-LOTIS Observations
  7. GRB 070419A Swift-BAT Refined Analysis
  8. GRB 070419A: RAPTOR Detection of Early Emission
  9. GRB 070419B: Swift XRT refined analysis
  10. GRB 070419: Keck/LRIS Absorption Redshift
  11. GRB 070419B: optical afterglow confirmation
  12. GRB 070419A, Optical observations
  13. GRB 070411: Deep VLT detection
  14. GRB 070419A: SARA observations
  15. GRB 070419A: NAYUTA Optical Observation
  16. GRB 070419B optical afterglow candidate
  17. GRB 070419B: optical afterglow candidate
  18. GRB 070419A: Lulin Optical observation
  19. Infrared detection of GRB070419A with UKIRT
  20. GRB 070419A: Kiso Optical observation
  21. GRB070330: Correction to UVOT position
  22. GRB 070419: P60 Confirmation of Optical Afterglow
  23. GRB 070419B: Swift detection of a burst
  24. GRB 070419 optical afterglow candidate
  25. GRB 070419A: ROTSE-III Optical Limits
  26. GRB 070419: Swift detection of a burst
  27. Trigger 276045: Swift detection of a possible burst
  28. GRB 070406: Swift XRT refined analysis
  29. GRB 070318, SMARTS optical/IR afterglow observations
  30. GRB 070411: TLS data shows plateau, flares
  31. GRB070412: UKIRT-WFCAM JHK upper limits
  32. GRB070412: Swift UVOT observations
  33. GRB 070411: Swift/UVOT observations
  34. GRB 070412 Liverpool Telescope optical limit
  35. GRB 070412: Swift-XRT refined analysis
  36. GRB 070411: Swift-XRT refined analysis
  37. GRB 070412: further reanalysis of NOT images
  38. GRB 070411: OA redshift
  39. GRB 070412: Swift-XRT refined position
  40. GRB 070412: further NOT observations
  41. GRB 070412: Gemini/GMOS afterglow candidate
  42. GRB 070412: IAC80 optical afterglow candidate
  43. GRB 070411: Magellan/Clay photometry
  44. GRB 070411: Magellan/IMACS photometry
  45. GRB 070412: NOT observations
  46. GRB 070412: Nearby bright galaxy
  47. GRB 070412: Swift detection of a burst
  48. GRB 070411: IAC80 optical observations
  49. GRB 070411: Optical observations at Crni Vrh
  50. GRB 070411: ROTSE-III Detection of Optical Counterpart
  51. GRB 070411: Tautenburg RRM Afterglow Confirmation
  52. GRB 070411: Swift detection of a burst with optical afterglow
  53. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  54. GRB 070406: Swift XRT team further analysis
  55. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  56. GRB 070406: Bright galaxy in XRT error circle is a quasar
  57. GRB 070406: Gemini South Imaging and XRT analysis
  58. GRB070406: Swift UVOT observations
  59. GRB 070406: further analysis of NOT images.
  60. Short GRB 070406 - Possible Bright Host Galaxy
  61. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  62. GRB 070406: NOT observations
  63. GRB 070406: Swift detection of a burst
  64. GRB 070311, deep optical photometry
  65. UVOT observations of GRB070330
  66. GRB 070330, SMARTS optical/IR observations
  67. GRB 070330: TAROT La Silla observatory optical observations
  68. GRB 070330: Swift-XRT refined analysis
  69. GRB 070330: Swift detection of a burst
  70. GRB 070328: Swift/UVOT Upper Limits
  71. GRB 070328: Swift/XRT Refined Analysis
  72. GRB 070328: Swift detection of a burst
  73. GRB070220: optical observations
  74. GRB070208: optical observations
  75. GRB070223: confirmation of nIR and optical afterglow
  76. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  77. GRB 070311, deep optical photometry
  78. GRB 070318: Gemini + Magellan spectra
  79. GRB070318: Swift UVOT continuing observations
  80. GRB070318: Swift-XRT refined analysis
  81. GRB 070318: Swift/UVOT Continued Observations
  82. GRB 070318: Swift detection of a burst with an optical afterglow
  83. GRB 070311: Late Central Engine Activity Optical Flare??
  84. GRB 070311: MDM Optical Monitoring
  85. VLA observation of GRB 070311
  86. GRB 070311: Tautenburg sees afterglow fading
  87. GRB 070311: Optical observation.
  88. GRB 070311: Optical Brightening
  89. GRB 070311: SARA upper limit
  90. GRB 070309: variability of the XRT afterglow candidate
  91. GRB 070311: MDM Optical Follow-up
  92. GRB 070311: RAPTOR Detection of Optical Emission
  93. GRB 070311: P60 Observations
  94. GRB 070311: MDM Optical Detection
  95. GRB 070311: Swift/UVOT Upper Limits
  96. GRB 070311: MITSuME Okayama Optical Observation
  97. GRB 070311: Swift-XRT refined analysis
  98. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  99. GRB 070311: REM candidate afterglow
  100. GRB060901: Candidate optical afterglow

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