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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"

32688 results found.

  1. Orphan GRB Afterglow candidate
  2. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  3. GRB 060206: Subaru/FOCAS optical spectroscopy
  4. GRB 060206: IR Detection of the Afterglow
  5. GRB 060206: Lick 3m Spectroscopy
  6. GRB 060204A: ROSAT Pointing
  7. GRB 060206: Super-LOTIS observations
  8. GRB060204A: Swift/UVOT observations
  9. GRB 060206: Swift-BAT refined analysis
  10. GRB060206: SDSS Pre-Burst Observations
  11. GRB060206: Swift XRT Refined Analysis
  12. GRB060206: Liverpool Telescope observation
  13. GRB 060206: Spectroscopic Redshift
  14. GRB060206: P60 Optical Observations
  15. GRB 060206: KAIT observations
  16. GRB060206: Swift XRT Position
  17. GRB060206: SARA Detection
  18. GRB 060206: RAPTOR observations of afterglow candidate variability.
  19. GRB 060206: High redshift burst
  20. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  21. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  22. GRB060206: Optical afterglow
  23. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  24. GRB060203: WHT Z-band observations
  25. BAT GRB 060204C is probably not a GRB
  26. GRB060204C: optical observation
  27. GRB 060204B: BVRi-band detections of optical afterglow
  28. GRB 060204A: Swift XRT upper limit
  29. GRB 060204A: FRAM optical observations
  30. GRB060204B: Swift/UVOT refined analysis
  31. GRB 060204C: optical observations
  32. Swift XRT Observation of GRB 060204C
  33. GRB 060204B: Swift-BAT refined analysis
  34. GRB 060204B: ART early limit
  35. GRB060204B: Swift XRT Team Refined Analysis
  36. GRB 060204C: OSN limits
  37. GRB 060204b: Keck/LRIS Afterglow Confirmation
  38. GRB 060204C: BOOTES-IR optical limits
  39. GRB 060204C: Liverpool Telescopes optical limit
  40. GRB 060204C: ROTSE-III Optical Limits
  41. GRB 060124: Radio Observations
  42. GRB060204B: Faulkes OT candidate
  43. GRB 060204B: ART optical limit
  44. GRB 060204A: further INTEGRAL results
  45. GRB060204B, optical observation
  46. GRB 060203: Swift-BAT refined analysis
  47. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  48. GRB 060203: RTT150 optical observations
  49. GRB060203 - Swift UVOT observation
  50. Swift-BAT trigger is GRB 060203
  51. GRB 060203: IR Counterpart
  52. GRB060203: Observations with SARA
  53. GRB 060203: P60 Confirmation of Optical Afterglow
  54. Possible GRB 060203: candidate optical counterpart
  55. Swift BAT Trigger 180151: Swift XRT source detection
  56. Possible GRB 060203: optical observations at Asiago
  57. GRB 060202: PROMPT Observations
  58. GRB 060202: GETS observation
  59. GRB 060202: Gemini-N J, H, K_s observations
  60. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  61. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  62. GRB 060202: Refined analysis of the Swift-BAT burst
  63. GRB060202, optical observation
  64. GRB 060202: Swift/UVOT upper limits
  65. GRB 060202: Swift XRT Team Refined Analysis
  66. GRB 060202 : Lulin R and I band limit
  67. GRB060202: Faulkes North observation
  68. GRB 060121: Gemini Late-time Observations
  69. GRB 060130: PROMPT Observations
  70. GRB060130: Further R-band imaging
  71. GRB 060130: Swift/XRT observation
  72. GRB 051211A: MDM Observations
  73. GRB 060123: VLA Radio Observations
  74. GRB060130: Optical imaging
  75. GRB060130: REM infrared observations
  76. GRB 060130, SMARTS optical observations
  77. GRB 060130: FRAM optical observations
  78. Possible GRB 051221B: MDM Correction
  79. GRB050121: optical observation
  80. GRB050121b: optical observation
  81. GRB 060121: Confirmation of NIR Afterglow
  82. GRB060124: optical observation
  83. GRB060124: optical observations
  84. GRB 060123: Swift refined analysis of an unusual GRB
  85. GRB060124, BVRcIc field calibration
  86. GRB060124 optical observations
  87. GRB 060121: Probable Detection of NIR Afterglow
  88. GRB060124: optical observation
  89. GRB 060116 HST observations
  90. GRB 060124: HETE detection and spectrum of the main peak
  91. Refined XRT Position for GRB 060123
  92. Konus-Wind observation of GRB 060124
  93. GRB060124: detailed XRT analysis
  94. GRB 060124 Optical Observations
  95. GRB 060124: ART optical limits during the burst
  96. GRB060123: Optical and IR Imaging
  97. GRB 060123: P200 Observations
  98. GRB 060124: Keck optical spectrum
  99. GRB 060124: Keck Absorption Redshift
  100. GRB 060124: XRT refined analysis

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