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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"

36346 results found.

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

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