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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"

32724 results found.

  1. GRB 060202: Swift XRT Team Refined Analysis
  2. GRB 060202 : Lulin R and I band limit
  3. GRB060202: Faulkes North observation
  4. GRB 060121: Gemini Late-time Observations
  5. GRB 060130: PROMPT Observations
  6. GRB060130: Further R-band imaging
  7. GRB 060130: Swift/XRT observation
  8. GRB 051211A: MDM Observations
  9. GRB 060123: VLA Radio Observations
  10. GRB060130: Optical imaging
  11. GRB060130: REM infrared observations
  12. GRB 060130, SMARTS optical observations
  13. GRB 060130: FRAM optical observations
  14. Possible GRB 051221B: MDM Correction
  15. GRB050121: optical observation
  16. GRB050121b: optical observation
  17. GRB 060121: Confirmation of NIR Afterglow
  18. GRB060124: optical observation
  19. GRB060124: optical observations
  20. GRB 060123: Swift refined analysis of an unusual GRB
  21. GRB060124, BVRcIc field calibration
  22. GRB060124 optical observations
  23. GRB 060121: Probable Detection of NIR Afterglow
  24. GRB060124: optical observation
  25. GRB 060116 HST observations
  26. GRB 060124: HETE detection and spectrum of the main peak
  27. Refined XRT Position for GRB 060123
  28. Konus-Wind observation of GRB 060124
  29. GRB060124: detailed XRT analysis
  30. GRB 060124 Optical Observations
  31. GRB 060124: ART optical limits during the burst
  32. GRB060123: Optical and IR Imaging
  33. GRB 060123: P200 Observations
  34. GRB 060124: Keck optical spectrum
  35. GRB 060124: Keck Absorption Redshift
  36. GRB 060124: XRT refined analysis
  37. GRB 060124: R band Observations
  38. GRB060124: optical observations at Asiago
  39. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  40. GRB060123: SDSS pre-burst observations
  41. GRB 060123: Swift detection of a very long, faint burst
  42. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  43. GRB 060121: OHP optical limits
  44. GRB 060124: TAROT optical limits
  45. GRB 060124: Swift/UVOT Observation
  46. GRB 060124: Confirmation of the Afterglow
  47. GRB 060124: XRT position
  48. GRB 060124: Optical Afterglow Candidate from Tautenburg
  49. GRB060124, optical observation
  50. GRB 060124: Optical Observations at Tautenburg
  51. GRB 060117: Suzaku WAM observation of the prompt emission
  52. GRB 060111B: Suzaku WAM observation of the prompt emission
  53. GRB 060116: Radio Detection
  54. GRB 060116: MARGE optical observations
  55. GRB 060121: Swift/UVOT upper limits
  56. GRB 060121: Liverpool Telescopes optical limits
  57. GRB 060121: Swift XRT refined analysis
  58. Konus-Wind observation of GRB 060121
  59. GRB 060121: I-band Limits
  60. GRB 060121: Confirmation of Afterglow
  61. GRB 060121: candidate optical counterpart
  62. GRB 060121: Swift XRT refined position
  63. GRB060121: SARA Observations
  64. GRB 060121: optical observations
  65. GRB 060121: Infrared Observations
  66. GRB 060121: optical observations
  67. GRB 060121: Optical imaging
  68. GRB060121 - SDSS pre-burst observations
  69. GRB 060121: A short-hard GRB in a cluster?
  70. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  71. GRB 060117: PROMPT Observations
  72. GRB060117 - ATCA 3/6cm radio limits - correction
  73. GRB060117 - ATCA 3/6cm radio limits
  74. GRB 060116: photometric redshift - the farthest GRB?
  75. Correction to GCN 4542 on GRB 060117
  76. Konus-Wind observation of GRB 060117
  77. GRB 060116: possible I-J dropout
  78. GRB 060116: UKIRT IR Observations
  79. GRB060108: photometric redshift determination
  80. GRB 060117: Refined analysis of the Swift-BAT burst
  81. GRB 060116: PROMPT Observations
  82. GRB 060117: FRAM refined analysis
  83. GRB 060117: FRAM optical afterglow candidate
  84. GRB 060117: nearby galaxy
  85. GRB 060116: VLT optical observations
  86. GRB 060116: Refined analysis of the Swift-BAT burst
  87. GRB 060115: PROMPT Observations
  88. GRB 060116: XRT refined analysis
  89. GRB 060116: IR Candidate Afterglow
  90. GRB 060116: Swift/UVOT upper limits
  91. GRB060115: REM observations
  92. GRB 060110: XRT position and analysis
  93. GRB 060116 : Lulin optical limit
  94. GRB 060116: ROTSE-III Optical Limits
  95. GRB060116: XRT position
  96. GRB 060115: absorption redshift
  97. GRB 060115: Refined analysis of the Swift-BAT burst
  98. GRB 060115: OT photometry with MITSuME
  99. GRB 060115: Swift/UVOT upper limits
  100. GRB 060114: REM observations

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