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"

27468 results found.

  1. GRB 150413A: Khureltogot optical observations
  2. GRB 150413A: MASTER bright OT detection
  3. GRB 150413A: Swift detection of a burst
  4. Swift trigger 637807 is probably not an astrophysical source
  5. Swift detection of SAX J1808.4-3658
  6. Swift GRB150402A: further XRT observations
  7. GRB 150407A: Swift-XRT observations
  8. GRB 150407A: optical observations
  9. GRB 150407A: Swift detection of a possible burst
  10. GRB 150407A: Swift ToO observations
  11. GRB 150403A: MASTER-net optical observation
  12. Swift triggered on a source in Terzan 5 (trigger=637212)
  13. GRB 150404A: Fermi GBM detection
  14. Konus-Wind observation of GRB 150403A
  15. Fermi trigger 449861706: MASTER-SAAO possible candidate to OT of Short GRB
  16. GRB 150403A: Swift-BAT refined analysis
  17. GRB 150403A: Fermi GBM Detection
  18. GRB 150403A: Swift/UVOT Detection
  19. GRB 150323C: Khureltogot optical observations
  20. GRB 150403A: Swift-XRT refined Analysis
  21. GRB 150403A: Fermi-LAT detection
  22. GRB 150403A: Swift detection of a burst with an optical counterpart
  23. GRB 150402A: results of Swift observations
  24. GRB 150402A: RATIR Optical Observations
  25. GRB 150402A: Swift ToO observations
  26. GRB 150402A detected in ground analysis of Swift-BAT data
  27. IPN Triangulation of GRB 150330A (long/very intense)
  28. GRB 150330A: Fermi GBM detection
  29. GRB 150323B: Swift-XRT afterglow detection
  30. GRB 141212A: GMG observation limit
  31. GRB 141220A: GMG observation limit
  32. GRB 141225A: GMG observation limit
  33. GRB 150120B: GMG observation
  34. Konus-Wind observation of GRB 150323B
  35. Konus-Wind observation of GRB 150323A
  36. GRB 150323B : Xinglong TNT upper limit
  37. GRB 150323C, Swift-BAT refined analysis
  38. GRB 150323C: Swift/UVOT Upper Limits
  39. GRB 150323B: Swift-XRT observations
  40. GRB 150323C: RATIR Optical Afterglow Observations
  41. GRB 150323C : Xinglong TNT optical observation
  42. GRB 150323C: Swift-XRT refined Analysis
  43. GRB 150323A, Swift-BAT refined analysis
  44. GRB150323C: Fermi GBM detection
  45. GRB 150323B: Fermi GBM observation
  46. GRB 150323C: MASTER-net optical observation
  47. GRB 150323C: Swift detection of a burst
  48. GRB 150323B: Swift ToO observations
  49. GRB 150323B detected in ground analysis of Swift-BAT data
  50. GRB 150323A: Swift-XRT refined Analysis
  51. GRB150323A: Swift-UVOT detection of the afterglow
  52. GRB 150314A: GMG observation limit
  53. GRB 150323A: RATIR Optical Afterglow Observations
  54. GRB 150323A: P60 Optical Afterglow Candidate
  55. GRB 150323A: Swift detection of a burst
  56. Swift Triggers 635788-635794 are probably not real.
  57. Fermi GBM trigger 150319666 is not a GRB
  58. GRB 150318A: Swift-XRT refined Analysis
  59. Confirmation that Swift trigger 635306 is not an astrophysical source
  60. GRB 150318A: Skynet PROMPT-CTIO Observations
  61. GRB 150318A: Swift-BAT refined analysis
  62. GRB 150318A: Swift/UVOT Upper Limits
  63. GRB 150318A : GROND upper limits
  64. Swift Trigger 635306 is probably not an astrophysical source
  65. GRB 150318A: Swift detection of a burst
  66. GRB 150317A: Swift/UVOT Upper Limits
  67. GRB 150317A: Swift-XRT refined Analysis
  68. GRB 150317A: Swift-BAT refined analysis
  69. GRB 150317A: RATIR Optical Afterglow Detection
  70. GRB 150317A: NOT optical observations
  71. GRB 150317A: Swift detection of a burst
  72. GRB 150314A: Early RAPTOR Detection
  73. Konus-Wind observation of GRB 150314A
  74. GRB 150314A: Swift-XRT refined Analysis
  75. GRB 150314A: P60 observations
  76. GRB 150314A Swift-BAT refined analysis
  77. GRB 150314A: Swift/UVOT Detection
  78. GRB 150314A: Fermi GBM observation
  79. GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
  80. GRB 150314A: Fermi-LAT detection
  81. GRB 150314A: Swift detection of a bright burst
  82. Fermi GBM trigger 150312827 is not a GRB
  83. GRB 150311A: Konus-Wind trigger at 16:16:24 is not a GRB
  84. GRB 150311A: MAXI/GSC possible afterglow detection
  85. Konus-Wind observation of GRB 150309A
  86. GRB 150309A: ISON-Kislovodsk optic upper limit
  87. Fermi GBM trigger 150311331 is not a GRB
  88. GRB 150309A: Swift-BAT refined analysis
  89. GRB 150309A: Fermi GBM detection
  90. GRB150309A: Optical observations at Crni Vrh
  91. GRB 150309A: Swift/UVOT Upper Limits
  92. GRB 150309A: MASTER prompt optical observation
  93. GRB 150309A: Swift-XRT refined Analysis
  94. GRB 150309A : Liverpool Telescope observations
  95. GRB 150309A: BOOTES-1 and -2 upper limit
  96. GRB 150309A: Swift detection of a burst
  97. GRB 150305A: Swift XRT confirms weak INTEGRAL event as a new GRB
  98. Fermi GBM trigger 150307942 is not a GRB
  99. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  100. Swift J0045.2+4151: analysis of XMM-Newton archival data

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