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"

43889 results found.

  1. IPN Triangulation of GRB 140606B
  2. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  3. GRB 140606B: Swift XRT position
  4. GRB 140606B / Fermi 432717114 / iPTF 14bfu: Keck redshift
  5. GRB 140607A: Swift detection of a burst
  6. GRB 140606B: Fermi GBM detection
  7. Fermi 423717114: Additional P48 and P60 observations
  8. GRB 140606A: BOOTES-2 optical upper limit
  9. Fermi423717114: iPTF optical transient candidates
  10. GRB 140606A: Nanshan optical upper limit
  11. GRB 140606A: Swift-XRT upper limits
  12. Swift XRT status update
  13. Swift Trigger 600914 is noise
  14. GRB 140606A: Swift-BAT refined analysis
  15. GRB 140606A: Swift detection of a short hard burst
  16. Swift Trigger 600914 is probably a noise fluctuation
  17. Konus-Wind observation of GRB 140604A
  18. IPN Triangulation of GRB 140604A (short/hard)
  19. Swift XRT is off-line
  20. GRB 140523A: further Swift-XRT observations
  21. GRB 140528A: Fermi GBM Detection
  22. GRB 140529A BAT refined analysis
  23. Konus-Wind observation of GRB 140529A
  24. Konus-Wind observation of GRB 140528A
  25. GRB 140529A: Swift-XRT afterglow detection.
  26. GRB 140408A: Withdrawal of afterglow candidate
  27. GRB 140529A found in ground analysis of BAT slew data
  28. IPN Triangulation of GRB 140528A
  29. Chandra late-time observations of GRB140515A
  30. Swift Trigger 600114 in M31: UVOT Observations
  31. Swift trigger 600114 is not an outbursting X-ray source
  32. Swift Trigger 600114: Optical spectroscopy from GTC
  33. Swift Trigger 600114: Preliminary BAT analysis
  34. Swift Trigger 600114 in M31: Archival and Prompt UVOT Imaging
  35. Swift detection of a bright X-ray source in M31
  36. Fermi GBM trigger 422752719/ 140525971 is not a GRB
  37. Swift detection of SFXT IGR J17544-2619
  38. GRB 140523A: NOT observation
  39. Konus-Wind observation of GRB 140523A
  40. IPN Triangulation of GRB 140523A
  41. GRB 140523A: Nanshan optical upper limit
  42. Swift trigger 599860 probably not real
  43. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  44. GRB 140523A Tiled Swift observations
  45. GRB 140523A: Fermi-LAT detection
  46. GRB 140523A: Fermi GBM detection
  47. GRB 140521A: Fermi GBM Detection
  48. GRB 140423A: TShAO optical observations
  49. GRB 140521A: AAO optical observations
  50. GRB 140521A: Swift-BAT refined analysis
  51. GRB 140521A: AROMA-N Optical Observation
  52. GRB 140516A: further Swift-XRT analysis
  53. GRB 140521A: MASTER optical observations
  54. GRB 140521A: Swift detection of a burst
  55. GRB 140512A: Redshift from NOT
  56. GRB 140518A: T100 observations
  57. GRB 140518A: Continued RATIR Optical and NIR Observations
  58. GRB 140512A: MASTER prompt and afterglow optical observations
  59. GRB 140518A, Swift-BAT refined analysis
  60. GRB 140518A: Swift-XRT refined Analysis
  61. GRB 140518A: Skynet GORT Detections of the Optical Afterglow
  62. GRB 140518A: Swift/UVOT Upper Limits
  63. GRB 140518A: RATIR Optical and NIR Observations
  64. GRB 140518A: Gemini-N redshift
  65. GRB 140518A: P60 i-/z-band detections
  66. GRB 140518A: KAIT optical candidate
  67. GRB 140518A: Swift detection of a burst
  68. GRB 140516A: RATIR Optical and NIR Observations
  69. GRB 140516A: Subaru NIR imaging observations
  70. GRB 140516A: 6 GHz upper limit
  71. GRB 140516A: Gemini-North limit on an optical afterglow
  72. GRB 140516A: Swift/UVOT Upper Limits
  73. GRB 140516A: Swift-BAT refined analysis
  74. GRB 140516A: Swift-XRT refined Analysis
  75. GRB 140516A: NOT optical observations
  76. GRB 140516A: Enhanced Swift-XRT position
  77. GRB 140516A: MASTER early optical observations
  78. GRB 140516A: ISON-Kislovodsk optical observations
  79. GRB 140516A: TNG optical observations
  80. GRB 140516A: Swift detection of a short burst
  81. GRB 140515A: Swift-BAT refined analysis
  82. GRB 140515A: VLA Detection
  83. GRB 140515A : TNG near-infrared observations
  84. GRB 140419A: Continued Mondy optical observations
  85. GRB 140515A: GROND observation of the afterglow
  86. GRB 140515A: Spectroscopy from the 10.4m GTC
  87. GRB 140515A: Optical observations from the 2.5 m NOT
  88. GRB 140515A: Swift-XRT refined Analysis
  89. GRB 140515B: MAXI/GSC detection
  90. GRB 140515A: KAIT Optical Upper Limit
  91. GRB 140515A: Gemini-North imaging
  92. GRB 140515A: Swift/UVOT Upper Limits
  93. GRB 140515A: Enhanced Swift-XRT position
  94. GRB 140515A: Gemini-N redshift
  95. Trigger 599041: Swift detection of SFXT IGR J16479-4514
  96. GRB 140515A: Swift detection of a burst
  97. GRB 140508A: VLA detection
  98. Konus-Wind observation of GRB 140512A
  99. GRB 140423A: AAO optical upper limits
  100. GRB 140512A: Continued UVOT 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