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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"

32702 results found.

  1. GRB060210:Faulkes Telescope North Afterglow Confirmation
  2. GRB 060206: Swift/UVOT Observations
  3. GRB060209: RTT150 optical observations
  4. GRB 060209 : TAROT optical observation
  5. GRB 060206: near-infrared observations (JK' imaging)
  6. GRB 060206: WSRT Radio Observations
  7. GRB 060203: Swift/UVOT upper limits
  8. GRB 060206: TTT Observations
  9. GRB 060206: More PROMPT Detections
  10. GRB 060121 : WIDGET Pre-trigger limit
  11. GRB 060206: Tenagra II Observations
  12. GRB 060206: PROMPT Detections
  13. GRB060204a: Swift XRT Source is not GRB Afterglow
  14. GRB 060206: optical observations at Asiago
  15. Orphan GRB Afterglow candidate
  16. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  17. GRB 060206: Subaru/FOCAS optical spectroscopy
  18. GRB 060206: IR Detection of the Afterglow
  19. GRB 060206: Lick 3m Spectroscopy
  20. GRB 060204A: ROSAT Pointing
  21. GRB 060206: Super-LOTIS observations
  22. GRB060204A: Swift/UVOT observations
  23. GRB 060206: Swift-BAT refined analysis
  24. GRB060206: SDSS Pre-Burst Observations
  25. GRB060206: Swift XRT Refined Analysis
  26. GRB060206: Liverpool Telescope observation
  27. GRB 060206: Spectroscopic Redshift
  28. GRB060206: P60 Optical Observations
  29. GRB 060206: KAIT observations
  30. GRB060206: Swift XRT Position
  31. GRB060206: SARA Detection
  32. GRB 060206: RAPTOR observations of afterglow candidate variability.
  33. GRB 060206: High redshift burst
  34. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  35. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  36. GRB060206: Optical afterglow
  37. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  38. GRB060203: WHT Z-band observations
  39. BAT GRB 060204C is probably not a GRB
  40. GRB060204C: optical observation
  41. GRB 060204B: BVRi-band detections of optical afterglow
  42. GRB 060204A: Swift XRT upper limit
  43. GRB 060204A: FRAM optical observations
  44. GRB060204B: Swift/UVOT refined analysis
  45. GRB 060204C: optical observations
  46. Swift XRT Observation of GRB 060204C
  47. GRB 060204B: Swift-BAT refined analysis
  48. GRB 060204B: ART early limit
  49. GRB060204B: Swift XRT Team Refined Analysis
  50. GRB 060204C: OSN limits
  51. GRB 060204b: Keck/LRIS Afterglow Confirmation
  52. GRB 060204C: BOOTES-IR optical limits
  53. GRB 060204C: Liverpool Telescopes optical limit
  54. GRB 060204C: ROTSE-III Optical Limits
  55. GRB 060124: Radio Observations
  56. GRB060204B: Faulkes OT candidate
  57. GRB 060204B: ART optical limit
  58. GRB 060204A: further INTEGRAL results
  59. GRB060204B, optical observation
  60. GRB 060203: Swift-BAT refined analysis
  61. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  62. GRB 060203: RTT150 optical observations
  63. GRB060203 - Swift UVOT observation
  64. Swift-BAT trigger is GRB 060203
  65. GRB 060203: IR Counterpart
  66. GRB060203: Observations with SARA
  67. GRB 060203: P60 Confirmation of Optical Afterglow
  68. Possible GRB 060203: candidate optical counterpart
  69. Swift BAT Trigger 180151: Swift XRT source detection
  70. Possible GRB 060203: optical observations at Asiago
  71. GRB 060202: PROMPT Observations
  72. GRB 060202: GETS observation
  73. GRB 060202: Gemini-N J, H, K_s observations
  74. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  75. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  76. GRB 060202: Refined analysis of the Swift-BAT burst
  77. GRB060202, optical observation
  78. GRB 060202: Swift/UVOT upper limits
  79. GRB 060202: Swift XRT Team Refined Analysis
  80. GRB 060202 : Lulin R and I band limit
  81. GRB060202: Faulkes North observation
  82. GRB 060121: Gemini Late-time Observations
  83. GRB 060130: PROMPT Observations
  84. GRB060130: Further R-band imaging
  85. GRB 060130: Swift/XRT observation
  86. GRB 051211A: MDM Observations
  87. GRB 060123: VLA Radio Observations
  88. GRB060130: Optical imaging
  89. GRB060130: REM infrared observations
  90. GRB 060130, SMARTS optical observations
  91. GRB 060130: FRAM optical observations
  92. Possible GRB 051221B: MDM Correction
  93. GRB050121: optical observation
  94. GRB050121b: optical observation
  95. GRB 060121: Confirmation of NIR Afterglow
  96. GRB060124: optical observation
  97. GRB060124: optical observations
  98. GRB 060123: Swift refined analysis of an unusual GRB
  99. GRB060124, BVRcIc field calibration
  100. GRB060124 optical observations

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