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"

28119 results found.

  1. GRB 140928A: GROND Afterglow Candidate
  2. GRB 140928A: Swift-XRT observations
  3. GRB 140928A: Fermi-LAT detection
  4. GRB 140927A: Swift-UVOT analysis
  5. GRB 140927A: Swift-BAT refined analysis
  6. GRB 140927A: Swift-XRT refined Analysis
  7. GRB 140927A: Enhanced Swift-XRT position
  8. GRB 140927A: Swift detection of a burst
  9. Swift Trigger 613581 is not an astrophysical event
  10. Swift Trigger 613516 is not an astrophysical event
  11. GRB 140919A, Swift-BAT refined analysis
  12. GRB 140919A: Swift-XRT refined Analysis
  13. GRB 140919A: Swift/UVOT Detection
  14. GRB 140919A: GROND afterglow candidate
  15. GRB 140919A: Enhanced Swift-XRT position
  16. GRB 140919A: Swift-XRT observations
  17. GRB 140919A: Swift detection of a burst
  18. Swift detection of outburst from 4U 1700+24
  19. GRB 140916A: Swift/UVOT Upper Limits
  20. GRB 140916A: Swift-BAT refined analysis
  21. GRB 140916A: UKIRT J-band observations
  22. GRB 140916A: Swift-XRT refined Analysis
  23. GRB 140916A: Enhanced Swift-XRT position
  24. GRB 140916A: MITSuME Okayama upper limits
  25. GRB 140916B: iPTF Optical Observations
  26. GRB 140916A: Swift detection of a burst
  27. GRB 140907A: Continued DCT Observations
  28. GRB 140909A: Confirmation of the Swift-XRT afterglow
  29. GRB 140907A: Mondy optical observations
  30. GRB 140903A: Chandra detection of the afterglow
  31. GRB 140909A: Swift/UVOT Upper Limits
  32. GRB 140909A: Swift-XRT observations
  33. GRB 140907A: TShAO observations
  34. GRB 140907A: MASTER optical observations
  35. GRB 140907A: Nishi-Harima NIR Observations
  36. GRB 140907A: MITSuME Akeno Optical Observation
  37. IPN Triangulation of GRB 140906C (short/hard)
  38. GRB 140907A: T100 observations
  39. GRB 140907A: Swift-BAT refined analysis
  40. GRB 140907A: Swift-XRT refined Analysis
  41. GRB 140907A: Enhanced Swift-XRT position
  42. GRB 140907A: MITSuME Ishigakijima Optical Observation
  43. GRB140907A: MITSuME Okayama Optical Observation
  44. GRB140907A: Swift UVOT detection
  45. GRB 140906B: Fermi GBM Detection of a Long GRB
  46. GRB 140907A : Optical observations from Nanshan
  47. GRB 140907A: Swift detection of a burst with an optical counterpart
  48. GRB 140906A - Fermi GBM Detection
  49. GRB 140906A: iPTF optical transient candidates
  50. GRB 140903A: NOT optical and NIR observations
  51. GRB 140818B: TShAO optical upper limit
  52. GRB 140903A: ISON-Kislovodsk observations
  53. GRB 140903A: MAXI/GSC upper limit
  54. GRB 140903A: 6 GHz VLA detection
  55. GRB 140903A: Pan STARRS images of the field
  56. GRB 140901B found in ground analysis of BAT data
  57. GRB 140903A: Swift/UVOT Upper Limits
  58. GRB 140903A: P60 Optical Observations
  59. GRB140903A: Discovery Channel Telescope Optical Detection
  60. GRB 140903A: Swift-BAT refined analysis
  61. GRB 140903A: Swift-XRT refined Analysis
  62. GRB 140901A: Fermi GBM detection
  63. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  64. GRB 140829A: Fermi GBM Detection
  65. GRB 140829A: iPTF optical observations
  66. GRB140818B, the review of the sky area in plate archives
  67. GRB 140828A, Swift-BAT refined analysis
  68. IPN Triangulation of GRB 140825A (very intense/long)
  69. GRB 140828A: Swift detection of a burst
  70. GRB 140818B: TLS observations
  71. GRB 140824A: optical upper limit in CrAO
  72. GRB 140824B: Swift observations
  73. GRB 140824A: NOT optical upper limits
  74. GRB 140824A: OSN optical limit
  75. GRB 140824A: Swift-XRT refined Analysis
  76. GRB 140824A: Swift-BAT refined analysis
  77. GRB 140824A: Enhanced Swift-XRT position
  78. GRB 140824A: MITSuME Ishigakijima upper limits
  79. GRB 140824A: Swift/UVOT Upper Limits
  80. GRB 140824A: Swift detection of a burst
  81. GRB 140817A: NOT optical observations
  82. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  83. GRB 140817A: Khureltogot optical upper limit
  84. GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
  85. Fermi trigger 430148973: Swift-XRT observation
  86. GRB 140818A: GROND confirmation of afterglow candidate
  87. GRB140819A: Deep GROND Upper Limits
  88. Fermi 430148973/MASTER candidate: LCO-Sutherland observations
  89. Fermi trigg_num 430148973: OSN I-band observations
  90. GRB 140818B, Swift-BAT refined analysis
  91. Fermi trigg_num 430148973: bright OT inside large error box!
  92. GRB 140818B: Swift/UVOT Upper Limits
  93. GRB 140818B: Swift-XRT refined Analysis
  94. GRB 140818B: Fermi GBM detection
  95. GRB140818B : GROND afterglow candidate
  96. GRB 140818B: Enhanced Swift-XRT position
  97. GRB 140818B: OSN I-band afterglow candidate
  98. GRB 140817A: Swift/UVOT Afterglow Detection
  99. GRB 140818B: Swift detection of a burst
  100. Swift detection of SAX J1712.6-3739

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