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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"

39330 results found.

  1. GRB 060206: High redshift burst
  2. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  3. GRB060206: Swift-BAT detection of a burst
  4. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  5. BAT GRB 060204C is probably not a GRB
  6. GRB060204C: optical observation
  7. GRB 060204B: BVRi-band detections of optical afterglow
  8. GRB 060204A: Swift XRT upper limit
  9. GRB 060204A: FRAM optical observations
  10. GRB060204B: Swift/UVOT refined analysis
  11. GRB 060204C: optical observations
  12. Swift XRT Observation of GRB 060204C
  13. GRB 060204B: Swift-BAT refined analysis
  14. GRB 060204B: ART early limit
  15. GRB060204B: Swift XRT Team Refined Analysis
  16. GRB 060204C: OSN limits
  17. GRB 060204b: Keck/LRIS Afterglow Confirmation
  18. GRB 060204C: BOOTES-IR optical limits
  19. GRB 060204C: Liverpool Telescopes optical limit
  20. GRB 060204C: ROTSE-III Optical Limits
  21. GRB 060204C: Swift-BAT detection of a burst
  22. GRB 060124: Radio Observations
  23. GRB060204B: Faulkes OT candidate
  24. GRB 060204B: ART optical limit
  25. GRB 060204A: further INTEGRAL results
  26. GRB060204B - SDSS pre-burst observations
  27. GRB 060203: Swift-BAT refined analysis
  28. GRB 060204B: Swift detection of a burst
  29. GRB 060204: a long GRB detected by INTEGRAL
  30. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  31. GRB 060203: RTT150 optical observations
  32. GRB060203: Swift XRT Team Refined Analysis
  33. Swift-BAT trigger is GRB 060203
  34. GRB 060203: IR Counterpart
  35. GRB060203: Observations with SARA
  36. GRB 060203: P60 Confirmation of Optical Afterglow
  37. Possible GRB 060203: candidate optical counterpart
  38. Possible GRB 060203: optical observations at Asiago
  39. GRB 060202: PROMPT Observations
  40. GRB 060202: GETS observation
  41. GRB 060202: Gemini-N J, H, K_s observations
  42. GRB 060202 : Kiso B and R band limit
  43. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  44. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  45. GRB 060202: Refined analysis of the Swift-BAT burst
  46. GRB 060202: Swift/UVOT upper limits
  47. GRB 060202: Swift XRT Team Refined Analysis
  48. GRB 060202 : Lulin R and I band limit
  49. GRB060202: Faulkes North observation
  50. GRB 060202: Swift detection of a burst
  51. GRB 060121: Gemini Late-time Observations
  52. Erratum: SDSS pre-burst observations of GRB fields
  53. GRB 060130: PROMPT Observations
  54. GRB 060130: Swift/XRT observation
  55. GRB 051211A: MDM Observations
  56. GRB 060123: Gemini spectroscopy of the putative host galaxy
  57. GRB 060123: VLA Radio Observations
  58. GRB060130: Optical imaging
  59. GRB060130: REM infrared observations
  60. GRB 060130, SMARTS optical observations
  61. GRB 060130: FRAM optical observations
  62. GRB 060130: further INTEGRAL IBIS results
  63. GRB 060130: a long GRB detected with INTEGRAL
  64. Possible GRB 051221B: MDM Correction
  65. GRB050121: optical observation
  66. GRB050121b: optical observation
  67. GRB 060121: Confirmation of NIR Afterglow
  68. GRB060124: optical observation
  69. GRB060124: optical observations
  70. GRB 060123: Swift refined analysis of an unusual GRB
  71. GRB060124, BVRcIc field calibration
  72. GRB060105: refined analysis of the Suzaku observation
  73. GRB060124 optical observations
  74. GRB 060121: Probable Detection of NIR Afterglow
  75. GRB060124: optical observation
  76. GRB 060116 HST observations
  77. GRB 060124: HETE detection and spectrum of the main peak
  78. Refined XRT Position for GRB 060123
  79. Konus-Wind observation of GRB 060124
  80. GRB060124: detailed XRT analysis
  81. GRB 060124 Optical Observations
  82. GRB 060124: ART optical limits during the burst
  83. GRB060123: Optical and IR Imaging
  84. GRB 060123: P200 Observations
  85. GRB 060124: Keck optical spectrum
  86. GRB 060124: Keck Absorption Redshift
  87. GRB 060124: MDM Optical Spectrum
  88. GRB 060124: XRT refined analysis
  89. GRB 060124: R band Observations
  90. GRB 060124 : Optical observation at Xinglong and Kiso
  91. GRB060124: optical observations at Asiago
  92. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  93. GRB060123: SDSS pre-burst observations
  94. GRB 060123: Swift detection of a very long, faint burst
  95. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  96. GRB 060121: OHP optical limits
  97. GRB 060124: TAROT optical limits
  98. GRB 060124: Swift/UVOT Observation
  99. GRB 060124: Confirmation of the Afterglow
  100. GRB 060124: XRT position

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