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"

16277 results found.

  1. GRB 150220A: Optical observations at Kyiv comet station
  2. GRB 150323C; Konkoly optical observations
  3. GRB 150323B; Konkoly optical observations
  4. GRB 150323A; Konkoly optical observations
  5. GRB 150323C: Mondy optical observations
  6. GRB 150323C: RATIR Optical Afterglow Observations - Errata
  7. GRB 150323C: Swift/UVOT Upper Limits
  8. GRB 150323C: RATIR Optical Afterglow Observations
  9. GRB 150323C : Xinglong TNT optical observation
  10. GRB 150323C: Xingming upper limit
  11. GRB 150323A: KAIT Optical Observations
  12. GRB 150323C: Nanshan optical afterglow detection
  13. GRB 150323C: MASTER-net optical observation
  14. GRB150323A: Swift-UVOT detection of the afterglow
  15. GRB 150323A: Keck redshift
  16. GRB 150314A: GMG observation limit
  17. GRB 150323A: RATIR Optical Afterglow Observations
  18. GRB 150323A: P60 Optical Afterglow Candidate
  19. GRB 150314A: Further VLA observations
  20. GRB 150318A: Skynet PROMPT-CTIO Observations
  21. GRB 150318A: Swift/UVOT Upper Limits
  22. GRB 150317A: RATIR Optical Afterglow Detection
  23. GRB 150317A: NOT optical observations
  24. GRB 150314A: VLA observations
  25. GRB 150314A: Early RAPTOR Detection
  26. GRB 150314A: NOT further optical observations
  27. GRB 150314A: KAIT Optical Observations
  28. GRB 150314A: P60 observations
  29. GRB 150314A: NOT optical observations
  30. GRB 150314A: Swift/UVOT Detection
  31. GRB 150314A: MITSuME Akeno upper limits
  32. GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
  33. GRB 150314A: Fermi-LAT detection
  34. GRB 150314A: KAIT Optical Candidate
  35. GRB 150222A: CrAO optical observation
  36. GRB150309A: Optical observations at Crni Vrh
  37. GRB 150309A: Swift/UVOT Upper Limits
  38. GRB 150309A: MASTER prompt optical observation
  39. GRB 150309A : Liverpool Telescope observations
  40. GRB 150309A: BOOTES-1 and -2 upper limit
  41. Further UVOT Observations of Swift J0045.2+4151
  42. BAT trigger 633105 (GRB 150301C): NOT r-band upper limit
  43. GRB 150302A: BOOTES-2/TELMA upper limit
  44. GRB 150302A: Mondy optical upper limit
  45. GRB 150302A: Swift/UVOT Upper Limits
  46. GRB 150302A: MITSuME Okayama upper limits
  47. GRB 150301B: Swift/UVOT Observations
  48. GRB 150301B: LCOGT-Sutherland observations
  49. GRB 150302A: KAIT Optical Upper Limit
  50. GRB 150302A: NOT afterglow candidate
  51. GRB 150301B: GROND afterglow observations
  52. GRB 150301A: Swift/UVOT Upper Limits
  53. GRB 150301B: MASTER early OT detection
  54. GRB 150301B: Swift detection of a burst with an optical afterglow
  55. GRB 150301A: Swift detection of a short burst or new SGR
  56. GRB 150222A: Further GROND Observations
  57. GRB 150222A: I-band observations from OSN
  58. GRB 150222A: Swift/UVOT Upper Limits
  59. GRB 150222A: GROND optical afterglow candidate
  60. GRB 150222A: TNG optical observations
  61. GRB 150222A: Mondy optical observations
  62. GRB 150222A: Zadko observatory - Gingin optical observations
  63. GRB 150222A: MASTER early optical observations
  64. Trigger 631747: Swift detection of 4U 0614+09
  65. GRB 150213B: AAO photometry
  66. GRB 150213B: P60 Observations
  67. GRB 150213B: RATIR Optical and NIR Observations
  68. GRB 150213B: AAO optical observations
  69. GRB 150213B: optical detection from the NOT
  70. GRB 150212A: Swift/UVOT Observations
  71. GRB 150213B: Tautenburg Afterglow Detection
  72. GRB 150213B: Swift detection of a burst with an optical afterglow
  73. GRB 150211A: ROTSE-III Upper Optical Limit
  74. GRB 150212A: RATIR Optical and NIR Observations
  75. GRB 150212A: Khureltogot optical upper limit
  76. GRB 150212A: Skynet DSO14/GORT observations
  77. GRB 150212A: MASTER optical observations
  78. GRB150212A: P60 Afterglow Candidate
  79. GRB 150211A iTelescope observation
  80. GRB 150211A: Swift/UVOT Upper Limits
  81. GRB 150211A: KAIT Optical Upper Limit
  82. GRB 150211A: Mondy optical upper limit
  83. GRB 150211A: RATIR Optical and NIR Observations
  84. GRB 150211A: MASTER early optical observations
  85. GRB 150101B/ Swift J123205.1-105602: Second epoch Chandra observations
  86. GRB 150203A iTelescope observation
  87. GRB 140206B: Continued iPTF Observations
  88. GRB 150206A: GROND afterglow observations
  89. GRB 150206B: Fermi GBM detection
  90. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  91. GRB 150206B: iPTF Optical Observations
  92. GRB 150206A: Swift detection of a burst with an optical afterglow
  93. GRB 150204A: Swift/UVOT Upper Limits
  94. GRB 150203A: RAPTOR Limits Beginning at the Gamma-Ray Emitting Interval
  95. GRB 150203A: Swift/UVOT Upper Limits
  96. GRB 150203A: ISON-NM early optical limit
  97. GRB 150203A: MITSuME Okayama upper limits
  98. GRB 150202A: Swift/UVOT Upper Limits
  99. GRB 150203A: REM optical and NIR observations
  100. GRB 150203A: TAROT La Silla observatory optical observations

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