Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

28261 results found.

  1. GRB 121108A: Swift/UVOT Upper Limits
  2. GRB 121108A, Swift-BAT refined analysis
  3. GRB 121108A: Enhanced Swift-XRT position
  4. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  5. GRB 121108A: MITSuME Ishigakijima upper limits
  6. GRB 121108A: Weihai observatory optical observations
  7. GRB 121108A: TAROT Calern observatory optical observations
  8. GRB 121108A: Swift detection of a burst
  9. GRB 121031A: Fermi GBM detection
  10. GRB 121028A: Swift/UVOT Upper Limits
  11. GRB 121031A, Early peak observed with Swift-BAT
  12. GRB 121102A: Swift/UVOT Upper Limits
  13. GRB 121031A: Swift/UVOT Upper Limits
  14. GRB 121031A: Swift-XRT refined Analysis
  15. GRB 121102A: Enhanced Swift-XRT position
  16. GRB 121031A: Enhanced Swift-XRT position
  17. GRB 121102A: Swift-XRT refined Analysis
  18. GRB 121102A: Swift-BAT refined analysis
  19. GRB 121025A: Confirmation of the X-ray afterglow
  20. GRB 121029A Suzaku WAM observation of the prompt emission
  21. GRB 121102A : a long GRB detected by INTEGRAL
  22. GRB 121102A: Swift detection of a burst
  23. GRB 121027A: sub-mm upper limit
  24. GRB 121031A: Swift-BAT refined analysis
  25. GRB 121031A: Swift detection of a burst
  26. GRB 121027A: Swift/UVOT Possible Detection
  27. GRB 121024A: SMARTS optical/IR afterglow observations
  28. GRB 121027A: GROND Confirmation of Rebrightening
  29. GRB 121029A: Fermi GBM detection
  30. GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval
  31. GRB 121027A: MASTER early prompt optical limit
  32. GRB 121027A: Swift-XRT refined Analysis
  33. GRB 121027A: Brightening IR counterpart
  34. GRB 121028A: Swift-XRT refined Analysis
  35. GRB 121028A: Enhanced Swift-XRT position
  36. GRB 121028A: Swift-BAT refined analysis
  37. GRB 121027A: Enhanced Swift-XRT position
  38. GRB 121028A: MITSuME Okayama Optical upper limits
  39. GRB 121028A: Swift detection of a burst
  40. GRB 121011A: optical observations
  41. GRB 121027A: nIR afterglow candidate with AAT
  42. GRB 121027A: Swift-BAT refined analysis
  43. GRB 121025A: Swift-XRT observation
  44. GRB 121027A: Swift detection of a burst
  45. GRB 121024A: optical observations
  46. GRB 121024A: Swift/UVOT Observations
  47. GRB 121024A: CARMA 3mm Detection
  48. GRB 121024A: Swift-BAT refined analysis
  49. GRB 121024A: GMG optical observation
  50. GRB 121024A: MITSuME Ishigakijima upper limits
  51. GRB 121024A: MITSuME Okayama Optical upper limits
  52. GRB 121024A: Enhanced Swift-XRT position
  53. GRB 121024A: PAIRITEL NIR Detection
  54. GRB 121024A: Swift-XRT refined Analysis
  55. GRB 121024A: GROND Detection of the Optical/NIR Afterglow
  56. Skynet PROMPT/Dolomiti observations of GRB121024A
  57. GRB 121024A: TAROT Calern observatory optical detection of a bright counterpart
  58. GRB 121024A: Swift detection of a burst with an optical counterpart
  59. Swift Trigger 536502 is likely a noise fluctuation in coincidence with SAX J1818.6-1703
  60. GRB 121017A: Swift/UVOT Upper Limits
  61. GRB 121017A: Swift-XRT refined Analysis
  62. GRB 121017A: GROND Observations
  63. GRB 121017A: Swift-BAT refined analysis
  64. GRB 121017A: Enhanced Swift-XRT position
  65. GRB 121017A: 1.23m CAHA R-band observations
  66. GRB 121017A optical observations
  67. GRB 121017A: Swift detection of a burst
  68. GRB 121011B: Suzaku WAM observation of the prompt emission
  69. GRB 121011A Suzaku WAM observation of the prompt emission
  70. GRB 121012A: Fermi GBM detection
  71. GRB 121014A: Swift-BAT refined analysis
  72. GRB 121014A: Swift detection of a burst
  73. GRB 121011A: Swift/UVOT Detection
  74. GRB 121011A: misprint in GCNC 13854
  75. GRB 121011A: Fermi GBM observation
  76. GRB 121011A: Fermi-LAT detection of a burst
  77. GRB 121011A: Swift-XRT refined Analysis
  78. GRB 121011A: optical observations
  79. GRB 121011A: MASTER-Net bell light curve
  80. GRB 121011A, Swift-BAT refined analysis
  81. Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)
  82. GRB 121011A: Enhanced Swift-XRT position
  83. GRB 121011A: MITSuME Okayama Optical Observation
  84. GRB 121011A: Swift detection of a burst with optical afterglow
  85. Trigger 535747: Swift detection of an outburst from SGR1806-20
  86. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  87. GRB 120927A: optical upper limit
  88. GRB 120804A: Late-time Chandra observation
  89. GRB 121001A: GROND Afterglow Confirmation
  90. GRB 121001A: Swift/UVOT Upper Limits
  91. GRB 121001A: Swift-XRT refined Analysis
  92. GRB 121001A: Enhanced Swift-XRT Position
  93. Swift Trigger 535026 is GRB 121001A: Swift-BAT refined analysis
  94. Swift Trigger 535026: Optical decay confirmation with IAC80 and BOOTES-2/TELMA.
  95. GRB 121001A: possible optical counterpart
  96. Swift Trigger 535026: Galactic Transient or possible GRB
  97. GRB 120927A: Swift/UVOT Upper Limits
  98. GRB 120927A, Swift-BAT refined analysis
  99. GRB 120927A: GROND upper limits
  100. GRB 120927A: 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