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"

28251 results found.

  1. GRB 121125A: LOAO Observation
  2. GRB 121125A: Swift detection of a burst with optical counterpart
  3. GRB 121123A: GROND observations
  4. GRB 121123A: Enhanced Swift-XRT position
  5. GRB 121123A: Swift-XRT refined Analysis
  6. GRB 121123A: optical observations
  7. GRB 121123A: BOOTES-4 and IAC80 optical observations
  8. GRB 121123A: NOT optical observations
  9. GRB 121123A: Fermi GBM observation
  10. GRB 121123A: GMG optical observation
  11. GRB 121123A: Swift detection of a burst with optical counterpart
  12. GRB 121108A: optical upper limit
  13. Konus-Wind observation of GRB 121118B
  14. GRB 121117A: optical upper limit
  15. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  16. Swift-BAT trigger 538575 is not astrophysical
  17. GRB 121117A: Swift/UVOT Observations
  18. GRB 121117A: Swift-XRT refined Analysis
  19. GRB 121117A: Swift detection of a burst
  20. Trigger 538084: Swift detection of XTE J1739-302
  21. GRB 121108A: Swift-XRT refined Analysis
  22. GRB 121108A: Swift/UVOT Upper Limits
  23. GRB 121108A: Enhanced Swift-XRT position
  24. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  25. GRB 121108A: Optical observations
  26. GRB 121108A: MITSuME Ishigakijima upper limits
  27. GRB 121108A: Weihai observatory optical observations
  28. GRB 121108A: Swift detection of a burst
  29. GRB 121031A: Fermi GBM detection
  30. GRB 121028A: Swift/UVOT Upper Limits
  31. GRB 121102A: Swift/UVOT Upper Limits
  32. GRB 121031A: Swift/UVOT Upper Limits
  33. GRB 121031A: Swift-XRT refined Analysis
  34. GRB 121102A: Enhanced Swift-XRT position
  35. GRB 121031A: Enhanced Swift-XRT position
  36. GRB 121102A: Swift-XRT refined Analysis
  37. GRB 121025A: Confirmation of the X-ray afterglow
  38. GRB 121029A Suzaku WAM observation of the prompt emission
  39. GRB 121102A: Swift detection of a burst
  40. GRB 121027A: sub-mm upper limit
  41. GRB 121031A: Prompt enhanced Swift-XRT position
  42. GRB 121031A: Swift detection of a burst
  43. GRB 121027A: Swift/UVOT Possible Detection
  44. GRB 121024A: LOAO RIzY Observation
  45. GRB 121027A: X-shooter redshift confirmation
  46. GRB 121024A: SMARTS optical/IR afterglow observations
  47. GRB 121028A: near-IR observations at Calar Alto
  48. GRB 121027A: GROND Confirmation of Rebrightening
  49. GRB 121029A: Fermi GBM detection
  50. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  51. GRB 121027A: MASTER early prompt optical limit
  52. GRB 121027A: Swift-XRT refined Analysis
  53. GRB 121027A: Brightening IR counterpart
  54. GRB 121028A: Swift-XRT refined Analysis
  55. GRB 121028A: Enhanced Swift-XRT position
  56. GRB 121027A: Enhanced Swift-XRT position
  57. GRB 121028A: MITSuME Okayama Optical upper limits
  58. GRB 121028A: Faulkes Telescope North observations
  59. GRB 121028A: Swift detection of a burst
  60. GRB 121011A: optical observations
  61. GRB 121027A: nIR afterglow candidate with AAT
  62. GRB 121025A: Swift-XRT observation
  63. GRB 121027A: MAXI/GSC detection 40 minutes after the Swift Trigger
  64. GRB 121027A: Swift detection of a burst
  65. GRB 121024A: optical observations
  66. GRB 121024A: EVLA Detection
  67. GRB 121024A: Swift/UVOT Observations
  68. GRB 121024A: CARMA 3mm Detection
  69. GRB 121024A: GMG optical observation
  70. GRB 121024A: MITSuME Ishigakijima upper limits
  71. GRB 121024A: MITSuME Okayama Optical upper limits
  72. GRB 121025A: MAXI/GSC detection
  73. GRB 121024A: Enhanced Swift-XRT position
  74. GRB 121024A: PAIRITEL NIR Detection
  75. GRB 121024A: Swift-XRT refined Analysis
  76. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  77. GRB 121024A: VLT/X-shooter redshift
  78. GRB 121024A: BOOTES-1B optical detection
  79. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  80. GRB 121024A: Swift detection of a burst with an optical counterpart
  81. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  82. GRB 121011A: early optical light curve
  83. GRB 121017A: Swift/UVOT Upper Limits
  84. GRB 121017A: Swift-XRT refined Analysis
  85. GRB 121017A: GROND Observations
  86. GRB 121017A: Enhanced Swift-XRT position
  87. GRB 121017A: 1.23m CAHA R-band observations
  88. GRB 121017A optical observations
  89. GRB 121017A: BOOTES-2/TELMA observations
  90. GRB 121017A: Swift detection of a burst
  91. GRB 121011A Suzaku WAM observation of the prompt emission
  92. GRB 121012A: Fermi GBM detection
  93. PdB IRAM observation of GRB 121011A
  94. GRB 121011A: WSRT radio observation
  95. GRB 121014A: Swift detection of a burst
  96. GRB 121011A: optical observations
  97. GRB 121011A: Swift/UVOT Detection
  98. GRB 121011A: NOT redshift retraction
  99. GRB 121011A: Fermi-LAT detection of a burst
  100. GRB 121011A: Swift-XRT refined Analysis

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