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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"

32766 results found.

  1. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  2. GRB060203: WHT Z-band observations
  3. BAT GRB 060204C is probably not a GRB
  4. GRB060204C: optical observation
  5. GRB 060204B: BVRi-band detections of optical afterglow
  6. GRB 060204A: Swift XRT upper limit
  7. GRB 060204A: FRAM optical observations
  8. GRB060204B: Swift/UVOT refined analysis
  9. GRB 060204C: optical observations
  10. Swift XRT Observation of GRB 060204C
  11. GRB 060204B: Swift-BAT refined analysis
  12. GRB 060204B: ART early limit
  13. GRB060204B: Swift XRT Team Refined Analysis
  14. GRB 060204C: OSN limits
  15. GRB 060204b: Keck/LRIS Afterglow Confirmation
  16. GRB 060204C: BOOTES-IR optical limits
  17. GRB 060204C: Liverpool Telescopes optical limit
  18. GRB 060204C: ROTSE-III Optical Limits
  19. GRB 060124: Radio Observations
  20. GRB060204B: Faulkes OT candidate
  21. GRB 060204B: ART optical limit
  22. GRB 060204A: further INTEGRAL results
  23. GRB060204B, optical observation
  24. GRB 060203: Swift-BAT refined analysis
  25. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  26. GRB 060203: RTT150 optical observations
  27. GRB060203 - Swift UVOT observation
  28. Swift-BAT trigger is GRB 060203
  29. GRB 060203: IR Counterpart
  30. GRB060203: Observations with SARA
  31. GRB 060203: P60 Confirmation of Optical Afterglow
  32. Possible GRB 060203: candidate optical counterpart
  33. Swift BAT Trigger 180151: Swift XRT source detection
  34. Possible GRB 060203: optical observations at Asiago
  35. GRB 060202: PROMPT Observations
  36. GRB 060202: GETS observation
  37. GRB 060202: Gemini-N J, H, K_s observations
  38. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  39. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  40. GRB 060202: Refined analysis of the Swift-BAT burst
  41. GRB060202, optical observation
  42. GRB 060202: Swift/UVOT upper limits
  43. GRB 060202: Swift XRT Team Refined Analysis
  44. GRB 060202 : Lulin R and I band limit
  45. GRB060202: Faulkes North observation
  46. GRB 060121: Gemini Late-time Observations
  47. GRB 060130: PROMPT Observations
  48. GRB060130: Further R-band imaging
  49. GRB 060130: Swift/XRT observation
  50. GRB 051211A: MDM Observations
  51. GRB 060123: VLA Radio Observations
  52. GRB060130: Optical imaging
  53. GRB060130: REM infrared observations
  54. GRB 060130, SMARTS optical observations
  55. GRB 060130: FRAM optical observations
  56. Possible GRB 051221B: MDM Correction
  57. GRB050121: optical observation
  58. GRB050121b: optical observation
  59. GRB 060121: Confirmation of NIR Afterglow
  60. GRB060124: optical observation
  61. GRB060124: optical observations
  62. GRB 060123: Swift refined analysis of an unusual GRB
  63. GRB060124, BVRcIc field calibration
  64. GRB060124 optical observations
  65. GRB 060121: Probable Detection of NIR Afterglow
  66. GRB060124: optical observation
  67. GRB 060116 HST observations
  68. GRB 060124: HETE detection and spectrum of the main peak
  69. Refined XRT Position for GRB 060123
  70. Konus-Wind observation of GRB 060124
  71. GRB060124: detailed XRT analysis
  72. GRB 060124 Optical Observations
  73. GRB 060124: ART optical limits during the burst
  74. GRB060123: Optical and IR Imaging
  75. GRB 060123: P200 Observations
  76. GRB 060124: Keck optical spectrum
  77. GRB 060124: Keck Absorption Redshift
  78. GRB 060124: XRT refined analysis
  79. GRB 060124: R band Observations
  80. GRB060124: optical observations at Asiago
  81. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  82. GRB060123: SDSS pre-burst observations
  83. GRB 060123: Swift detection of a very long, faint burst
  84. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  85. GRB 060121: OHP optical limits
  86. GRB 060124: TAROT optical limits
  87. GRB 060124: Swift/UVOT Observation
  88. GRB 060124: Confirmation of the Afterglow
  89. GRB 060124: XRT position
  90. GRB 060124: Optical Afterglow Candidate from Tautenburg
  91. GRB060124, optical observation
  92. GRB 060124: Optical Observations at Tautenburg
  93. GRB 060117: Suzaku WAM observation of the prompt emission
  94. GRB 060111B: Suzaku WAM observation of the prompt emission
  95. GRB 060116: Radio Detection
  96. GRB 060116: MARGE optical observations
  97. GRB 060121: Swift/UVOT upper limits
  98. GRB 060121: Liverpool Telescopes optical limits
  99. GRB 060121: Swift XRT refined analysis
  100. Konus-Wind observation of GRB 060121

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