Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

32764 results found.

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

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov