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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"

36349 results found.

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

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