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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"

16023 results found.

  1. GRB060124: optical observation
  2. GRB060124: optical observations
  3. GRB060124, BVRcIc field calibration
  4. GRB060124 optical observations
  5. GRB 060121: Probable Detection of NIR Afterglow
  6. GRB060124: optical observation
  7. GRB 060116 HST observations
  8. GRB 060124: HETE detection and spectrum of the main peak
  9. Refined XRT Position for GRB 060123
  10. GRB060124: detailed XRT analysis
  11. GRB 060124 Optical Observations
  12. GRB 060124: ART optical limits during the burst
  13. GRB060123: Optical and IR Imaging
  14. GRB 060124: Keck optical spectrum
  15. GRB 060124: MDM Optical Spectrum
  16. GRB 060124 : Optical observation at Xinglong and Kiso
  17. GRB060124: optical observations at Asiago
  18. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  19. GRB 060121: OHP optical limits
  20. GRB 060124: TAROT optical limits
  21. GRB 060124: Swift/UVOT Observation
  22. GRB 060124: Confirmation of the Afterglow
  23. GRB 060124: XRT position
  24. GRB 060124: Optical Afterglow Candidate from Tautenburg
  25. GRB060124, optical observation
  26. GRB 050124 : Kiso Optical limit
  27. GRB 060124: Optical Observations at Tautenburg
  28. GRB060124:MASTER optical observation
  29. GRB 060116: MARGE optical observations
  30. GRB 060121: Liverpool Telescopes optical limits
  31. GRB 060121: I-band Limits
  32. GRB 060121: Confirmation of Afterglow
  33. GRB 060121: candidate optical counterpart
  34. GRB 060121: optical observations
  35. GRB 060121: optical observations
  36. GRB 060121: Optical imaging
  37. GRB 060121 (=H4010): Results of preliminary spectral analysis
  38. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  39. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  40. HETE Alert 4006: MASTER promt optical limit
  41. GRB060108: photometric redshift determination
  42. GRB 060117: FRAM refined analysis
  43. GRB 060117: FRAM optical afterglow candidate
  44. GRB 060116: VLT optical observations
  45. GRB060115: REM observations
  46. GRB 060116 : Lulin optical limit
  47. GRB 060116: ROTSE-III Optical Limits
  48. GRB 060115: absorption redshift
  49. GRB 060114: REM observations
  50. GRB 060115: Swift XRT refined analysis
  51. GRB 060115: OT finding chart
  52. GRB060115, optical observation
  53. GRB 060115: MITSuME optical afterglow candidate
  54. GRB060114, optical observation
  55. GRB 060108: IR observations of afterglow
  56. GRB 060108: Evidence for an XRT Position Offset
  57. GRB 060111B: Swift XRT refined analysis
  58. GRB 060111B: MITSuME detection of optical afterglow
  59. GRB 060111B: TAROT optical observation
  60. GRB060111A: RTT150 optical observations
  61. GRB060111B: RTT150, possible host galaxy
  62. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  63. GRB060111.2:_MASTER optical limit
  64. GRB 060111: TAROT optical observation
  65. GRB 060111: ROTSE-III Optical Limits
  66. GRB 060110: Mitsume optical observations
  67. GRB 060110a: RAPTOR detection of early optical emission.
  68. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  69. GRB060110, optical observation
  70. GRB 060110: Optical observation
  71. GRB 060110: Optical limit
  72. GRB060109, optical observation
  73. GRB060108: P200 Ks Observations
  74. GRB 060108: early UKIRT K-band observations
  75. GRB 060108: a dark burst?
  76. GRB 060108: Mitsume optical observations
  77. GRB060108: Faulkes Telescope observation
  78. GRB060108, optical observation
  79. GRB 060105: Mitsume optical observations
  80. GRB060105, optical observation
  81. GRB060105 : Kiso optical observation
  82. GRB051211B: optical observations
  83. GRB 051221B: Optical Observations with Kuiper 1.54m
  84. GRB 051227: optical observation
  85. GRB 051221A: VLA Radio Observations
  86. GRB051227: Radio Observations
  87. GRB 051227: optical afterglow
  88. GRB 051227: Joint Swift-HETE Spectral Analysis
  89. GRB 051227, optical observation
  90. GRB051117B: optical observation
  91. GRB 051221A: MDM Optical Observations
  92. GRB 051221A: Chandra Afterglow Position
  93. GRB 051221B: ROTSE-III Optical Limits
  94. GRB 051221B: TAROT optical limits
  95. GRB 051221A: WSRT Radio Observations
  96. GRB 051221: Continued fading of optical afterglow
  97. Possible GRB 051221B: MDM Optical Detection
  98. GRB 051221A: RAPTOR Fading Counterpart Constraint
  99. GRB 051221B: BOOTES optical observations.
  100. GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral

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