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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"

18364 results found.

  1. GRB 060130: Swift/XRT observation
  2. GRB060130: Optical imaging
  3. GRB060130: REM infrared observations
  4. GRB 060130, SMARTS optical observations
  5. GRB 060130: FRAM optical observations
  6. GRB 060121: Confirmation of NIR Afterglow
  7. GRB060124, BVRcIc field calibration
  8. GRB 060121: Probable Detection of NIR Afterglow
  9. GRB 060116 HST observations
  10. GRB 060124: ART optical limits during the burst
  11. GRB060123: Optical and IR Imaging
  12. GRB 060123: P200 Observations
  13. GRB 060124: R band Observations
  14. GRB 060124 : Optical observation at Xinglong and Kiso
  15. GRB060123: SDSS pre-burst observations
  16. GRB 060121: OHP optical limits
  17. GRB 060124: TAROT optical limits
  18. GRB 060124: XRT position
  19. GRB060124, optical observation
  20. GRB 060124: Optical Observations at Tautenburg
  21. GRB 060124: Swift-BAT detection of a burst
  22. GRB 060121: Liverpool Telescopes optical limits
  23. GRB 060121: candidate optical counterpart
  24. GRB 060121: Infrared Observations
  25. GRB 060121: optical observations
  26. GRB 060121: Optical imaging
  27. GRB060121 - SDSS pre-burst observations
  28. HETE Alert 4006: MASTER promt optical limit
  29. GRB060117 - ATCA 3/6cm radio limits - correction
  30. GRB060117 - ATCA 3/6cm radio limits
  31. GRB 060116: UKIRT IR Observations
  32. GRB 060117: FRAM optical afterglow candidate
  33. GRB 060117: nearby galaxy
  34. GRB 060116: VLT optical observations
  35. GRB 060116: IR Candidate Afterglow
  36. GRB 060116: Swift/UVOT upper limits
  37. GRB060115: REM observations
  38. GRB060116: Faulkes North observation
  39. GRB 060116: Swift-BAT detection of a burst
  40. GRB 060115: Swift/UVOT upper limits
  41. GRB 060114: REM observations
  42. GRB 060114: Swift/UVOT Observations
  43. GRB060115, optical observation
  44. GRB 060115: MITSuME optical afterglow candidate
  45. GRB 060115: Swift detection of a burst
  46. GRB060114, optical observation
  47. GRB060114: Faulkes North observation
  48. GRB 060108: IR observations of afterglow
  49. GRB 060108: Evidence for an XRT Position Offset
  50. GRB 060110: KAIT observations
  51. GRB 060111B: MITSuME detection of optical afterglow
  52. GRB 060111B: TAROT optical observation
  53. GRB060111A: RTT150 optical observations
  54. GRB060111B: RTT150, possible host galaxy
  55. GRB 060111(a): P60 Observations
  56. GRB 060111B: Gualba observatory limit
  57. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  58. GRB 060111B: Swift detection of a burst
  59. GRB 060108: VLT K-band observations
  60. GRB 060111: TAROT optical observation
  61. GRB060111 : XRT refined analysis
  62. GRB 060111: Swift detection of a burst
  63. GRB 060110: Mitsume optical observations
  64. GRB 060108: z-band imaging from Gemini-North
  65. GRB 060110a: RAPTOR detection of early optical emission.
  66. GRB 060110: UKIRT K-band observations
  67. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  68. GRB 060110: IR Candidate Afterglow
  69. GRB060110, optical observation
  70. GRB 060110: Correction
  71. GRB 050110: IR Observations
  72. GRB 060109: Swift/UVOT upper limits
  73. GRB060109, optical observation
  74. GRB 060108: ISAS early observations and near IR upper limit
  75. GRB060108: P200 Ks Observations
  76. GRB 060108: early UKIRT K-band observations
  77. GRB 060108: VLT J-band observations
  78. GRB 060108: Mitsume optical observations
  79. GRB 060108: Swift/UVOT upper limits
  80. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  81. GRB060108: SDSS pre-burst observations
  82. GRB060108: Faulkes Telescope observation
  83. GRB060108, optical observation
  84. GRB060108: Swift detection of its 100th GRB
  85. GRB 060105: ISAS observations and near IR upper limit
  86. GRB 060105: Swift/UVOT upper limits
  87. GRB 060105: Mitsume optical observations
  88. GRB060105: Suzaku-XIS and -HXD observation plan
  89. GRB060105, optical observation
  90. GRB060105: Swift detection of a bright long burst
  91. Swift-BAT trigger 175653 is probably not a GRB
  92. GRB 051221B: Optical Observations with Kuiper 1.54m
  93. GRB 051227: optical observation
  94. GRB 051227: optical afterglow
  95. GRB 051227: Magellan r'-band Imaging/Astrometry
  96. GRB 051227: refined analysis of VLT images
  97. GRB 051227: P60 Observations
  98. GRB 051227: MDM Observation
  99. GRB 051227: R-band object in the XRT error circle
  100. GRB051227: SDSS pre-burst observations

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