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"

36179 results found.

  1. XRT GRB Catalogue now live and online
  2. GRB 111103B: optical upper limit
  3. GRB 110820A: optical observations in Maidanak observatory
  4. GRB 111103A: optical upper limit of Mt. Terskol observatory
  5. GRB 111215B: Suzaku WAM observation of the prompt emission
  6. GRB 111211A: optical ovservations at Mt. Terskol observatory
  7. GRB111215A: optical upper limit
  8. GRB 111215B: Swift/UVOT Upper Limits
  9. Konus-Wind observation of GRB 111215B
  10. GRB 111215B: Swift-XRT observations
  11. GRB 111205A: Confirmation of X-ray Afterglow
  12. IPN Triangulation of GRB 111215B (long/intense)
  13. GRB 111215A: WHT, LT and NOT imaging
  14. GRB 111215A: TNG K-band observations
  15. GRB 111215A: MITSuME Okayama Optical upper limits
  16. GRB 111215A: Swift/UVOT Upper Limits
  17. GRB 111215A: Swift-XRT refined Analysis
  18. Possible detection of pre-trigger X-ray emission from GRB 111215A by MAXI/GSC
  19. GRB 111215A: Enhanced Swift-XRT position
  20. GRB 111215A: Swift-BAT refined analysis
  21. GRB 111215A: OSN I-band observations
  22. GRB 111215A: MASTER-Net optical prompt and follow up observations
  23. GRB 111215A, Optical Observations
  24. GRB 111215A: MITSuME Akeno Optical upper limits
  25. GRB 111209A: RAPTOR Limits Before and During the Gamma-ray Emitting Interval
  26. GRB 111215A: GMG optical upper limit
  27. GRB 111215A : Xinglong TNT upper limit
  28. GRB 111215A: Swift detection of a burst
  29. GRB 111201A, the review of the sky area in plate archive
  30. GRB 111212A: GROND observations
  31. GRB 111211A: Swift/UVOT Detection
  32. GRB 111211A: VLT/X-shooter redshift
  33. Konus-Wind observation of GRB 111211A
  34. GRB 111211A: NOT afterglow confirmation
  35. GRB 111212A: Swift-XRT refined Analysis
  36. GRB 111211A: Swift/XRT target of opportunity observation
  37. GRB 111212A: Swift/UVOT Upper Limits
  38. GRB 111212A: Swift-BAT refined analysis
  39. GRB 111212A: Enhanced Swift-XRT position
  40. GRB 111212A: Swift-XRT observations
  41. GRB 111211A: GROND afterglow candidate
  42. GRB 111212A: Swift detection of a burst
  43. GRB 111211A: SuperAGILE localization of a long GRB
  44. GRB 111210A: Xinglong TNT upper limit
  45. GRB 111209A - ATCA 34GHz upper limit
  46. Konus-Wind observation of GRB 111209A
  47. GRB 111210A: GROND observations
  48. GRB 111210A: SDSS prior imaging
  49. GRB 111210A: Swift-XRT refined Analysis
  50. GRB 111210A: MITSuME Okayama Optical upper limits
  51. GRB 111208A: Swift-XRT refined analysis
  52. GRB 111210A: Gemini-North candidate counterpart
  53. GRB 111209A: Rebrightening seen by GROND
  54. GRB 111210A: Swift/UVOT Upper Limits
  55. GRB 111210A: Spectral lag analysis
  56. GRB 111210A: Enhanced Swift-XRT position
  57. GRB 111210A: Swift-BAT refined analysis
  58. GRB 111210A: Swift detection of a burst
  59. GRB 111209A: IRTF NIR Imaging/Spectroscopy
  60. GRB 111209A: VLT/X-shooter redshift
  61. GRB 111209A: GROND Afterglow observations
  62. GRB 111209A optical limit by "Pi of the Sky"
  63. GRB 111209A: PROMPT optical observations of early afterglow
  64. GRB 111208A: Lightbuckets Optical Observations
  65. GRB 111209A: Swift-XRT refined Analysis
  66. GRB 111209A: Swift UVOT refined analysis
  67. GRB 111209A: Swift Burst of Interest
  68. GRB 111209A, Swift-BAT refined analysis
  69. GRB 111209A: Enhanced Swift-XRT position
  70. GRB111209A : planned XMM-Newton observation
  71. GRB 111209A: TAROT La Silla observatory optical light curve analysis
  72. GRB 111205A: GROND observations
  73. GRB 111209A: Faulkes Telescope North observations
  74. GRB 111209A: REM NIR detection
  75. GRB 111209A: TAROT La Silla observatory optical detection
  76. GRB 111209A: Swift detection of a long burst with an optical counterpart
  77. GRB 111208A: Swift XRT/UVOT observations
  78. GRB 111205A: Swift XRT Observations
  79. GRB 111207A found in ground analysis of BAT data
  80. GRB 111208A found in ground analysis of BAT data
  81. Konus-Wind observation of GRB 111205A
  82. IPN Triangulation of GRB 111205A (long/hard/intense)
  83. GRB 111117A: Refined GMG observation
  84. GRB 111204A: TNG NIR observations
  85. GRB 111201A: GMG optical observation
  86. GRB 111204A: GROND Observations
  87. GRB 111204A: Swift-XRT refined Analysis
  88. GRB 111204A, Swift-BAT refined analysis
  89. GRB 111022B: CrAO optical limit
  90. GRB 111204A: Swift/UVOT Upper Limits
  91. GRB 110921A: optical observations in Maidanak observatory
  92. GRB 111204A: MASTER optical observations
  93. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  94. GRB 111204A: Enhanced Swift-XRT position
  95. GRB 111123A: optical upper limit in CrAO
  96. GRB 111204A: Swift detection of a burst
  97. GRB 111201A: Confirmation of the X-ray afterglow
  98. GRB 111201A: Swift/UVOT Upper Limits
  99. GRB 111201A found in ground analysis of BAT data
  100. GRB 111121A: Suzaku WAM observation of the prompt emission

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