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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"

32764 results found.

  1. GRB 070521: Keck imaging
  2. GRB070521: Gemini Observations
  3. GROND upper limits of GRB 070521
  4. GRB 070521 Milagro GeV/TeV Observations
  5. GRB 070520B: SARA upper limit
  6. GRB 070520A: SARA upper limit
  7. GRB 070521: SARA upper limit
  8. GRB 070521: Subaru observations and possible host detection
  9. GRB070518: Optical/NIR observation
  10. GRB 070520B: Swift/UVOT Upper Limits
  11. GRB 070520A: Subaru Observations
  12. GRB 070521, Swift-BAT refined analysis
  13. GRB 070520A: Swift UVOT Upper Limits
  14. GRB 070520B: Swift-XRT refined analysis
  15. GRB070521: P200 Observations
  16. GRB070521 : Faulkes Telescope North Observations
  17. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  18. GRB 070520A: MITSuME Akeno optical upper limits
  19. GRB 070520B, Swift-BAT refined analysis
  20. GRB 070520A, Swift-BAT refined analysis
  21. GRB 070520A: Swift-XRT refined analysis
  22. GRB 070518: TNG observations
  23. GRB 070520: Xinglong EST optical Upper Limit
  24. VLA observation of GRB 070518
  25. GRB 070518: Swift-XRT refined analysis
  26. GRB 070517: Gemini optical imaging
  27. GRB070518: UVOT refined analysis
  28. GRB 070518, Swift-BAT refined analysis
  29. GRB 070518: OT confirmed form Xinglong TNT observation
  30. GRB070517: Swift-XRT Refined Analysis
  31. GRB 070517, Swift-BAT refined analysis
  32. GRB 070509: objects inside XRT error circle
  33. GRB070419A: optical observations
  34. GRB 070419A, Deep LBT photometry
  35. GRB 070509: Swift/UVOT Upper Limits
  36. Konus-Wind and Konus-A observation of GRB 070508
  37. Swift-BAT trigger 278987 is not a GRB
  38. GRB070509: Swift-XRT Refined Analysis
  39. RHESSI Spectrum of GRB070508
  40. GRB 070508: OA fading and tentative redshift
  41. GRB 070509, Swift-BAT refined analysis
  42. GRB 070508: Suzaku/WAM observation of the prompt emission
  43. GRB 070509: REM observations
  44. GRB 070509: ROTSE-III Optical Limits
  45. GRB070508: Swift/UVOT Observations
  46. GRB 070508, SMARTS optical afterglow observation
  47. GRB 070508, Swift-BAT refined analysis
  48. GRB 070508: Multicolor optical observations and possible redshift limit
  49. GRB 070508: Swift-XRT refined analysis
  50. GRB 070508: Optical observation limiting magnitude
  51. GRB 070508: Optical afterglow detection
  52. GRB 070508: REM observations
  53. GRB070412: MAGIC telescope GeV observation
  54. Swift-BAT trigger 278809 is not a GRB
  55. GRB 070506: VLT redshift
  56. GRB070506: Swift/UVOT Observations
  57. GRB070506: Swift XRT refined analysis
  58. GRB 070506, Swift-BAT Refined Analysis
  59. GRB 070412, deep LBT imaging
  60. GRB 070429A: Swift XRT further analysis
  61. GRB070429B: VLT observations
  62. GRB 070429A: optical observations
  63. GRB070429B: position correction
  64. GRB 070309: Swift-XRT afterglow confirmation
  65. GRB070429B: possible host galaxy detection
  66. VLA observation of GRB 070429B
  67. Swift/UVOT observations of GRB070429B
  68. GRB 070429B, Swift-BAT refined analysis
  69. Swift/UVOT observations of GRB070429A
  70. GRB 070429A: Swift XRT refined analysis
  71. GRB 070429A, Swift-BAT refined analysis
  72. GRB 070429B: Swift XRT refined analysis
  73. GRB 070429B: ROTSE-III Optical Limits
  74. GRB 070429: ROTSE-III Optical Limits
  75. GRB 070427, Swift-BAT Refined Analysis
  76. LT monitoring of GRB070412
  77. GRB 070411, further deep LBT photometry
  78. GRB 070411: Late-time Keck imaging
  79. GRB070419B: Suzaku WAM observation of the prompt emission
  80. GRB 070420, SMARTS optical/IR afterglow observations
  81. GRB 070411, deep LBT photometry
  82. Konus-Wind observation of GRB 070420
  83. GRB 070411: break in the optical light curve
  84. GRB 070420 Swift-BAT Refined Analysis
  85. GRB070419A: Kuiper Optical detection
  86. GRB070419a: Swift UVOT observations
  87. GRB 070419A: MARGE Observations
  88. GRB 070420: optical rebrightening observed at Mt. John
  89. GRB 070420: Swift XRT refined analysis
  90. GRB070420: Swift UVOT continuing observations
  91. GRB 070411: BART early limit
  92. GRB 070420: Faulkes Telescope South Observations
  93. GBR 070419A: Swift/XRT refined analysis
  94. GRB 070420: NIR and optical afterglow confirmed
  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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