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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"

18360 results found.

  1. GRB 070512: IPN localization and Konus spectrum of a bright burst
  2. GRB 070509: Swift/UVOT Upper Limits
  3. GRB 070509: REM observations
  4. GRB 070508: REM observations
  5. GRB 070508: TAROT La Silla observatory optical observations
  6. GRB 070508: Swift detection of an intense burst with an optical counterpart
  7. GRB070412: MAGIC telescope GeV observation
  8. GRB070506: Swift/UVOT Observations
  9. GRB 070506: Swift detection of a burst with optical afterglow
  10. GRB070429B: VLT observations
  11. GRB070429B: position correction
  12. GRB 070309: Swift-XRT afterglow confirmation
  13. VLA observation of GRB 070429B
  14. Swift/UVOT observations of GRB070429B
  15. Swift/UVOT observations of GRB070429A
  16. GRB 070429A: optical and NIR observations
  17. GRB 070429B: ROTSE-III Optical Limits
  18. GRB 070429: ROTSE-III Optical Limits
  19. GRB 070429: Swift detection of a burst
  20. LT monitoring of GRB070412
  21. GRB 070411: Late-time Keck imaging
  22. GRB070420: Swift UVOT continuing observations
  23. GRB 070420: Faulkes Telescope South Observations
  24. GBR 070419A: Swift/XRT refined analysis
  25. GRB 070420: TAROT La Silla observatory optical observations
  26. GRB 070420: NIR and optical afterglow confirmed
  27. GRB 070420: Swift detection of a burst with optical afterglow
  28. GRB 070419A: MITSuME Okayama Observations
  29. GRB070419 - SDSS Pre-Burst Observations
  30. GRB 070419A: SARA observations
  31. GRB 070419A: NAYUTA Optical Observation
  32. GRB 070419A: Optical and IR observations with KANATA
  33. GRB070419A, optical observation
  34. Infrared detection of GRB070419A with UKIRT
  35. GRB 070419A: Kiso Optical observation
  36. GRB 070419: P60 Confirmation of Optical Afterglow
  37. GRB 070419B: Swift detection of a burst
  38. GRB 070419A: ROTSE-III Optical Limits
  39. GRB 070419: Swift detection of a burst
  40. GRB 070418: Optical and IR observations with KANATA
  41. Trigger 276045: Swift detection of a possible burst
  42. GRB 070406: Swift XRT refined analysis
  43. GRB070412: UKIRT-WFCAM JHK upper limits
  44. GRB070412: Swift UVOT observations
  45. GRB 070411: Swift/UVOT observations
  46. GRB 070412, Swift-BAT refined analysis
  47. GRB 070412 Liverpool Telescope optical limit
  48. GRB 070412: Optical observations at Crni Vrh
  49. GRB 070412: further NOT observations
  50. GRB 070412: IAC80 optical afterglow candidate
  51. GRB 070412: NOT observations
  52. GRB 070412: Swift detection of a burst
  53. GRB 070411: IAC80 optical observations
  54. GRB 070411 : Liverpool Telescope Observations
  55. GRB 070411: Swift detection of a burst with optical afterglow
  56. GRB 070406: Swift XRT team further analysis
  57. Suzaku ToO observation of SGR 1806-20
  58. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  59. GRB 070406: Correction to the optical candidate in GCN6253
  60. GRB 070406: Gemini South Imaging and XRT analysis
  61. GRB070406: Swift UVOT observations
  62. GRB 070406: NOT observations
  63. GRB 070406: SARA upper limit
  64. GRB 070406: Xinglong TNT optical Upper Limit
  65. GRB 070311, deep optical photometry
  66. UVOT observations of GRB070330
  67. GRB 070330: TAROT La Silla observatory optical observations
  68. GRB 070330 - Watcher Observations
  69. GRB 070328: Swift/UVOT Upper Limits
  70. GRB 070328 : Suzaku ToO follow up starts
  71. GRB 070328: Swift detection of a burst
  72. GRB 070311, deep optical photometry
  73. Short-Hard GRB 070209: PROMPT Observations
  74. GRB 070318: absorption-line redshift
  75. GRB070318: Swift UVOT continuing observations
  76. GRB070318: Swift-XRT refined analysis
  77. GRB 070318: Swift detection of a burst with an optical afterglow
  78. VLA observation of GRB 070311
  79. GRB 070311: Optical observation.
  80. GRB 070306: possible emission-line redshift
  81. GRB 070311: SARA upper limit
  82. GRB070311: FRAM early follow-up limit
  83. GRB 070311: P60 Observations
  84. GRB 070311: Swift/UVOT Upper Limits
  85. GRB 070311: MITSuME Okayama Optical Observation
  86. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  87. GRB 070311: REM candidate afterglow
  88. GRB060901: Candidate optical afterglow
  89. GRB 070125: Chandra X-ray Confirmation of Jet Break
  90. GRB 070309: Swift/UVOT Upper Limits
  91. GRB 070306, optical observation
  92. Swift UVOT Finding Charts for GRB 070309
  93. GRB 070309: A long GRB detected by INTEGRAL
  94. VLA observation of GRB 070306
  95. GRB 070306: NOT observations
  96. GRB 070306 Swift/UVOT refined analysis
  97. GRB 070306: IR observations and candidate afterglow
  98. GRB 070306: XRT Team Refined Analysis
  99. GRB 070306: Optical and IR observations with KANATA
  100. GRB070306 - SDSS Pre-burst Observations

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