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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"

21471 results found.

  1. GRB 071101, Swift-BAT refined analysis
  2. GRB 071101: Swift-XRT Team refined analysis
  3. GRB071101: Optical and NIR upper limits by KANATA
  4. GRB0711101: Two new source from Xinglong TNT observation
  5. GRB 071101: TAROT Calern observatory optical observations
  6. GRB 071101: Swift XRT position
  7. GRB 071101: BOOTES-2 prompt optical observations
  8. GRB 071101: a nearby galaxy
  9. GRB 071101: Swift detection of a burst
  10. GRB 071031, Swift-BAT refined analysis
  11. GRB 071031: Swift/UVOT detection of afterglow
  12. GRB 071031: Swift-XRT Team refined analysis
  13. GRB 071031: GROND detection in all bands
  14. GRB 071031: Swift detection of a burst with an optical counterpart
  15. GRB 071028B Swift-BAT detection of a burst
  16. GRB 071028: SARA observations of variable source
  17. Swift UVOT upper limits to GRB071028
  18. GRB071028: Xinglong EST V-band upper limit
  19. GRB 071028: Swift-XRT Team refined analysis
  20. GRB 071028, Swift-BAT refined analysis
  21. GRB 071028: Swift detection of a burst
  22. GRB 071025: Kuiper Telescope Optical Observations
  23. GRB 071018: Revised BAT position
  24. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  25. GRB071021: MARGE Optical Limits
  26. GRB071020, optical upper limit
  27. GRB 071025 Milagro GeV/TeV Observations
  28. Swift UVOT upper limits
  29. GRB071025: Xinglong TNT I-band upper limit
  30. GRB 071025: Swift-XRT Team refined analysis
  31. GRB 071025, Swift-BAT refined analysis
  32. GRB 071025: Early Super-LOTIS Observations
  33. GRB 071025: ROTSE-III Refined Analysis
  34. GRB 071025: Swift XRT refined position
  35. GRB071025: REM NIR afterglow
  36. GRB 071025: ROTSE-III Detection of Optical Counterpart
  37. GRB 071025: Swift detection of a burst
  38. GRB 071020: BTA spectroscopy
  39. Possible radio detection of GRB 071021 with the VLA
  40. Radio detection of GRB 071020 with the VLA
  41. GRB 071021: Subaru NIR observation
  42. GRB071021: MITSuME Okayama Optical Upper Limits
  43. GRB 071021: Magellan i-band observation
  44. GRB 071021: Magellan R-band observation
  45. GRB 071021: optical and NIR observations
  46. GRB 071021, Swift-BAT refined analysis
  47. GRB071018: 2nd epoch obsevations of Xinglong TNT
  48. GRB 071021: Swift-XRT Team refined analysis
  49. GRB 071021: Xinglong TNT optical Upper Limit
  50. GRB 071021 : Lulin R-band limit
  51. Konus-Wind observation of GRB 071020
  52. GRB 071021: Faulkes Telescope South optical candidate
  53. GRB 071021: Swift detection of a burst
  54. GRB 071020: Swift-XRT refined analysis
  55. GRB 071020, Swift-BAT refined analysis
  56. GRB 071020: ROTSE-III Analysis of Optical Counterpart
  57. GRB071020 - SDSS Pre-burst Observations
  58. GRB 071020: Swift detection of a bright burst
  59. GRB 071020A: ROTSE-III Detection of Optical Counterpart
  60. GRB 071018: Mercator Telescope optical observations
  61. Swift autonomous slewing re-enabled
  62. GRB 071018: SARA observations
  63. GRB 071018: Swift-XRT observation
  64. GRB 071017 - Swift XRT observations
  65. VLA radio observation of GRB 071018
  66. GRB 071010A: Late-time Keck/LRIS photometry - possible host galaxy and jet break
  67. GRB 071018, Swift-BAT refined analysis
  68. GRB 071018?: Swift detection of a possible burst
  69. GRB 071010B: Suzaku WAM observation of the prompt emission
  70. GRB 071013: 3rd TLS Epoch - constraints on variability
  71. GRB 071013: TLS Upper Limit
  72. VLA detection of radio afterglow of GRB 071010B
  73. VLA non-detection of GRB 071011
  74. GRB 071013: Optical observations
  75. GRB 071013, Swift-BAT refined analysis
  76. GRB 071013: Swift detection of a burst
  77. GRB 071010C Swift-BAT detection of a burst
  78. GRB 071011: Swift-XRT refined analysis
  79. VLA non-detection of GRB 071010A
  80. GRB 071011, Optical afterglow
  81. GRB 071011: Confirmation of P60 optical afterglow
  82. GRB 071011: Kanazawa Optical limits
  83. GRB 071011: P60 Optical Afterglow Candidate
  84. GRB 071011: MARGE Optical Limits
  85. GRB 071011: XRT afterglow detection
  86. GRB 071011, Swift-BAT refined analysis
  87. GRB 071011: Early Super-LOTIS Observations
  88. GRB 071010B: Bright OT confirmed with TLS
  89. GRB 071011: Swift detection of a burst
  90. Optical Observation: GRB 071010
  91. Optical observations: GRB 071010A
  92. Konus-Wind observation of GRB 071010B
  93. GRB071010B: Swift/XRT detection
  94. GRB 071010B, Swift-BAT refined analysis
  95. GRB 071006, Swift-BAT refined analysis
  96. GRB071008: optical observations
  97. GRB 071010B: Swift detection of a burst
  98. GRB 071010: Swift-XRT observation
  99. GRB 071008, Swift-BAT refined analysis
  100. GRB 071010, Swift-BAT refined analysis

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