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"

32757 results found.

  1. GRB 090902B: Skynet/PROMPT Observations
  2. GRB 090916, Swift-BAT refined analysis
  3. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  4. GRB 090827: Confirmation of the X-ray afterglow
  5. GRB 090912: Swift-XRT refined analysis
  6. GRB 090912, Swift-BAT refined analysis
  7. GRB 090912: Swift/UVOT Upper Limits
  8. GRB 090912 optical upper limit
  9. GRB 090910: Fermi GBM detection
  10. GRB 090814A: Skynet/DSO & GORT Observations
  11. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  12. GRB 090904B: GROND detection of the optical afterglow
  13. GRB 090831A: Suzaku WAM observation of the prompt emission
  14. GRB 090904A: Swift/UVOT Refined Analysis
  15. GRB 090904B: Swift/UVOT Refined Analysis
  16. GRB 090902B: Suzaku WAM observation of the prompt emission
  17. GRB 090904B: Fermi GBM detection
  18. GRB 090904A: Swift-XRT refined analysis
  19. GRB 090904B: Swift XRT Refined Analysis
  20. GRB 090904B: MOA-II Optical observation
  21. GRB 090904A: Enhanced Swift XRT position
  22. GRB 090904B: Swift-BAT refined analysis
  23. GRB 090902B: VLA radio detection
  24. GRB 090904A: Swift-BAT refined analysis
  25. GRB090904A: Correction to enhanced XRT position
  26. GRB 090904A: NOT observations
  27. GRB 090902B: WSRT Radio Observation
  28. GRB 090904B: Swift detection of a burst
  29. GRB 090904A: ROTSE-III Optical Limits
  30. GRB 090902B: Swift/UVOT refined analysis
  31. GRB090902B: Swift XRT refined analysis
  32. GRB 090902B: Faulkes Telescope North observations
  33. GRB 090902B: GROND NIR Afterglow Observations
  34. GRB 090902B: Gemini-N absorption redshift
  35. GRB 090902B: Fermi LAT and GBM refined analysis.
  36. GRB 090902B: Optical afterglow candidate
  37. GRB090902B: Swift/UVOT observations
  38. GRB 090902B: Swift/XRT Afterglow Candidate
  39. GRB 090831A: IPN Triangulation
  40. GRB 090831C BAT refined analysis
  41. GRB 090831C: GROND upper limits
  42. Konus-Wind observations of GRB 090831A
  43. Swift Trigger 361477, called GRB090831B, is probably not real.
  44. GRB090831C: Swift/UVOT upper limits
  45. GRB 090831B: MITSuME optical upper limits
  46. GRB 090831C: Swift XRT Refined Analysis
  47. GRB 090831B, RIMOTS optical upper limits
  48. GRB 090831: MAXI GSC detection
  49. Konus-Wind observations of GRB 090827
  50. GRB 090827: Swift XRT and UVOT observations
  51. GRB 090817 - TLS Observations
  52. GRB090817: Keck/LRIS Spectroscopy
  53. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  54. GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
  55. GRB 090823 Correction to BAT position
  56. GRB 090817: No host galaxy, no supernova
  57. Konus-Wind observations of GRB 090823
  58. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  59. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  60. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  61. GRB 090820: MASTER-Net optical polarization observations
  62. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  63. GRB 090817: Liverpool Telescope Observations
  64. GRB 090817: optical upper limit
  65. GRB 090817: Confirmation of the X-ray afterglow
  66. GRB 090815C: Swift refined analysis
  67. GRB 090817: Fermi GBM observation
  68. GRB 090817: Swift/UVOT Upper Limits
  69. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  70. GRB 090813: I-band observations from 1.5m OSN telescope
  71. GRB 090817: Swift-XRT observations
  72. GRB 090814A: optical observations
  73. GRB 090813: Suzaku WAM observation of the prompt emission
  74. GRB 090812: Suzaku WAM observation of the prompt emission
  75. VLA radio non-detection of GRB 090812
  76. GRB 090813: CrAO optical obsevations
  77. GRB 090814B: Confirmation of the X-ray afterglow
  78. GRB090814A: NOT optical follow-ups
  79. GRB 090814B: I-band observations from 1.23m CAHA telescope
  80. GRB 090814B: Swift/UVOT Upper Limits
  81. GRB 090814B: Liverpool Telescope Observations
  82. GRB 090814B: Swift-XRT detection of a possible afterglow.
  83. GRB 090814A: Swift/UVOT Observations
  84. GRB 090814A: Swift-XRT Team Refined Analysis
  85. GRB 090814A, RIMOTS optical upper limits
  86. GRB 090814A: Swift-BAT refined analysis
  87. GRB 090813: correction to GCN 9787
  88. GRB090814A: VLT spectroscopy
  89. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  90. GRB 090813: Fermi GBM observation
  91. GRB 090813: Swift-XRT refined analysis
  92. GRB 090813, Swift-BAT refined analysis
  93. Konus-Wind observations of GRB090813
  94. GRB090813: Swift/UVOT upper limits
  95. GRB 090813: Liverpool Telescope afterglow confirmation
  96. GRB 090813: P60 Optical Afterglow Confirmation
  97. GRB 090813: optical candidate from 1.23m CAHA telescope
  98. GRB 090812: WIRO NIR upper limit
  99. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  100. GRB 090812: RAPTOR detections during the burst

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