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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"

21526 results found.

  1. GRB 071122, Swift-BAT refined analysis
  2. GRB 071122 Swift XRT position update sent in error.
  3. GRB 071122 Swift-XRT refined analysis
  4. GRB 071122: P60 Optical Afterglow Candidate
  5. GRB 071122: ROTSE-III Optical Limits
  6. GRB 071122: Swift detection of a burst
  7. GRB071118 MITSuME OAO optical observation
  8. GRB 071117: VLT observations and probable redshift
  9. Swift/UVOT observations of GRB071118
  10. GRB 071117: Swift-XRT revised position
  11. Konus-Wind and Konus-A observations of GRB 071117
  12. Swift XRT follow-up observations of GRB071008
  13. Swift/UVOT upper limits for GRB 071117
  14. GRB071118: Swift XRT refined analysis
  15. GRB 071117: Gemini Optical Afterglow Discovery
  16. GRB 071118, Swift-BAT refined analysis
  17. GRB 071117: TAROT La Silla observatory optical observations
  18. GRB 071118: Swift detection of a burst
  19. GRB 071117: Gemini Observations
  20. GRB 071117: Las Campanas optical observations
  21. GRB 071117: Swift-XRT refined analysis
  22. GRB 071117, Swift-BAT refined analysis
  23. GRB 071117: Swift/XRT position
  24. GRB 071117: Initial Swift/UVOT observations
  25. GRB 071117: Swift detection of a bright burst
  26. Swift detection of MXB 0656-072
  27. VLA radio upper limit on GRB 071112C
  28. ATCA radio observations of short hard burst GRB 071112B
  29. Correction to the Swift-BAT Transient Identification (trigger=296683)
  30. GRB 071112C: Swift-BAT refined analysis
  31. GRB 071112C: Swift/UVOT observations
  32. GRB 071112C: Swift XRT refined analysis
  33. Swift UVOT upper limits of GRB071112B
  34. GRB 071112B: Gemini Optical Imaging
  35. GRB 071112B: Swift-XRT preliminary analysis
  36. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  37. GRB 071112C: Palomar Pre-Imaging
  38. Swift-BAT trigger 296491 is not a GRB
  39. GRB 071112C: TAROT Calern observatory optical observations
  40. Swift XRT follow-up observations of GRB071028B
  41. GRB 071112C: ROTSE-III Confirmation of Optical Counterpart
  42. GRB 071112B: ROTSE-III Rapid Optical Limits
  43. GRB 071112C: Swift detection of a burst with an optical counterpart
  44. GRB 071112B: Swift detection of a short hard burst
  45. GRB 071112: Swift detection of a possible burst
  46. GRB071109: Super-LOTIS observations
  47. VLA IInd observation of INTEGRAL burst GRB 071109
  48. Swift/UVOT initial analysis of GRB071109
  49. GRB 071109: further Swift-XRT analysis
  50. No radio detection at Swift-XRT position
  51. GRB 071109: Swift-XRT possible X-ray counterpart
  52. GRB 071104: Swift-XRT Team Refined Analysis
  53. GRB 071104: Possible Swift UVOT Afterglow Candidate
  54. GRB 071104: Swift-XRT position
  55. Swift XRT and UVOT observations of GRB071028B
  56. GRB 071101, Swift-BAT refined analysis
  57. GRB 071101: Swift-XRT Team refined analysis
  58. GRB071101: Optical and NIR upper limits by KANATA
  59. GRB0711101: Two new source from Xinglong TNT observation
  60. GRB 071101: TAROT Calern observatory optical observations
  61. GRB 071101: Swift XRT position
  62. GRB 071101: BOOTES-2 prompt optical observations
  63. GRB 071101: a nearby galaxy
  64. GRB 071101: Swift detection of a burst
  65. GRB 071031, Swift-BAT refined analysis
  66. GRB 071031: Swift/UVOT detection of afterglow
  67. GRB 071031: Swift-XRT Team refined analysis
  68. GRB 071031: GROND detection in all bands
  69. GRB 071031: Swift detection of a burst with an optical counterpart
  70. GRB 071028B Swift-BAT detection of a burst
  71. GRB 071028: SARA observations of variable source
  72. Swift UVOT upper limits to GRB071028
  73. GRB071028: Xinglong EST V-band upper limit
  74. GRB 071028: Swift-XRT Team refined analysis
  75. GRB 071028, Swift-BAT refined analysis
  76. GRB 071028: Swift detection of a burst
  77. GRB 071025: Kuiper Telescope Optical Observations
  78. GRB 071018: Revised BAT position
  79. GRB 071025A: RAPTOR Observations of Complex Early Optical Behavior
  80. GRB071021: MARGE Optical Limits
  81. GRB071020, optical upper limit
  82. GRB 071025 Milagro GeV/TeV Observations
  83. Swift UVOT upper limits
  84. GRB071025: Xinglong TNT I-band upper limit
  85. GRB 071025: Swift-XRT Team refined analysis
  86. GRB 071025, Swift-BAT refined analysis
  87. GRB 071025: Early Super-LOTIS Observations
  88. GRB 071025: ROTSE-III Refined Analysis
  89. GRB 071025: Swift XRT refined position
  90. GRB071025: REM NIR afterglow
  91. GRB 071025: ROTSE-III Detection of Optical Counterpart
  92. GRB 071025: Swift detection of a burst
  93. GRB 071020: BTA spectroscopy
  94. Possible radio detection of GRB 071021 with the VLA
  95. Radio detection of GRB 071020 with the VLA
  96. GRB 071021: Subaru NIR observation
  97. GRB071021: MITSuME Okayama Optical Upper Limits
  98. GRB 071021: Magellan i-band observation
  99. GRB 071021: Magellan R-band observation
  100. GRB 071021: optical and NIR observations

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