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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"
  1. GRB 070520: Swift detection of a burst
  2. VLA observation of GRB 070518
  3. GRB 070518: Swift-XRT refined analysis
  4. GRB 070517: Gemini optical imaging
  5. GRB070518: UVOT refined analysis
  6. GRB070518: OSN observation
  7. GRB 070518, Swift-BAT refined analysis
  8. GRB 070518: OT confirmed form Xinglong TNT observation
  9. GRB 070518: Swift detection of a burst with optical afterglow
  10. GRB070517: Swift-XRT Refined Analysis
  11. GRB 070517, Swift-BAT refined analysis
  12. GRB 070517: Optical search
  13. GRB 070517: Swift detection of a burst
  14. GRB 070509: objects inside XRT error circle
  15. GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
  16. GRB 070512: IPN localization and Konus spectrum of a bright burst
  17. GRB070419A: optical observations
  18. GRB 070419A, Deep LBT photometry
  19. GRB 070508: pseudo-z from 4 different spectral analyses
  20. GRB 070509: Swift/UVOT Upper Limits
  21. Konus-Wind and Konus-A observation of GRB 070508
  22. Swift-BAT trigger 278987 is not a GRB
  23. GRB 070510: Swift detection of a possible burst
  24. GRB070509: Swift-XRT Refined Analysis
  25. RHESSI Spectrum of GRB070508
  26. GRB 070508: OA fading and tentative redshift
  27. GRB 070509, Swift-BAT refined analysis
  28. GRB 070508: Suzaku/WAM observation of the prompt emission
  29. GRB 070509: REM observations
  30. GRB 070509: Swift detection of a burst
  31. GRB 070509: ROTSE-III Optical Limits
  32. GRB070508: Swift/UVOT Observations
  33. GRB 070508, SMARTS optical afterglow observation
  34. GRB 070508, Swift-BAT refined analysis
  35. GRB 070508: Multicolor optical observations and possible redshift limit
  36. GRB 070508: Swift-XRT refined analysis
  37. GRB 070508: Optical observation limiting magnitude
  38. GRB 070508: Optical afterglow detection
  39. GRB 070508: REM observations
  40. GRB 070508: TAROT La Silla observatory optical observations
  41. GRB 070508: Swift detection of an intense burst with an optical counterpart
  42. GRB070412: MAGIC telescope GeV observation
  43. Swift-BAT trigger 278809 is not a GRB
  44. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  45. GRB 070506: VLT redshift
  46. GRB070506: Swift/UVOT Observations
  47. GRB070506: Swift XRT refined analysis
  48. GRB 070506, Swift-BAT Refined Analysis
  49. GRB 070506: Swift detection of a burst with optical afterglow
  50. GRB 070412, deep LBT imaging
  51. GRB 070429A: Swift XRT further analysis
  52. GRB070429B: VLT observations
  53. GRB 070429A: optical observations
  54. GRB070429B: position correction
  55. GRB 070309: Swift-XRT afterglow confirmation
  56. GRB070429B: possible host galaxy detection
  57. VLA observation of GRB 070429B
  58. Swift/UVOT observations of GRB070429B
  59. GRB 070429B, Swift-BAT refined analysis
  60. Swift/UVOT observations of GRB070429A
  61. GRB 070429A: Swift XRT refined analysis
  62. GRB 070429A, Swift-BAT refined analysis
  63. GRB 070429A: optical and NIR observations
  64. GRB 070429B: Swift XRT refined analysis
  65. GRB 070429B: ROTSE-III Optical Limits
  66. GRB 070429B: Swift detection of a short burst
  67. GRB 070429: What's the temperature?
  68. GRB 070429: ROTSE-III Optical Limits
  69. GRB 070429: Swift detection of a burst
  70. GRB 070427, Swift-BAT Refined Analysis
  71. LT monitoring of GRB070412
  72. GRB 070427: Swift detection of a burst
  73. GRB 070411, further deep LBT photometry
  74. GRB 070411: Late-time Keck imaging
  75. GRB 070411 : Planned XMM-Newton observation
  76. GRB070419B: Suzaku WAM observation of the prompt emission
  77. GRB 070420, SMARTS optical/IR afterglow observations
  78. GRB 070411, deep LBT photometry
  79. GRB 070420: pseudo-z~1.56 from spectral parameters of the prompt
  80. Konus-Wind observation of GRB 070420
  81. GRB 070411: break in the optical light curve
  82. GRB 070420 Swift-BAT Refined Analysis
  83. GRB070419A: Kuiper Optical detection
  84. GRB070419a: Swift UVOT observations
  85. GRB 070419A: MARGE Observations
  86. GRB 070420: optical rebrightening observed at Mt. John
  87. GRB 070420: Swift XRT refined analysis
  88. GRB070420: Swift UVOT continuing observations
  89. GRB 070411: BART early limit
  90. GRB 070420: Faulkes Telescope South Observations
  91. GBR 070419A: Swift/XRT refined analysis
  92. GRB 070420: TAROT La Silla observatory optical observations
  93. GRB 070420: NIR and optical afterglow confirmed
  94. GRB 070420: Swift detection of a burst with optical afterglow
  95. GRB 070419A: MITSuME Okayama Observations
  96. GRB 070419A: Early Super-LOTIS Observations
  97. GRB 070419B, Swift-BAT refined analysis
  98. GRB 070419A Swift-BAT Refined Analysis
  99. GRB070419B: Confirmation of Optical Transient
  100. GRB 070419A: RAPTOR Detection of Early Emission

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