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

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