Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

6667 results found.

  1. GRB 150201A: Fermi GBM observation
  2. GRB 150127B: Fermi GBM detection
  3. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  4. GRB 150127A: Fermi-LAT detection
  5. GRB150127A: Fermi GBM Detection
  6. GRB 150126A: Fermi GBM Detection
  7. GRB 150123A: Swift-XRT observations
  8. GRB 150120B: Additional P60 observations
  9. GRB 150120A: Swift-XRT refined Analysis
  10. GRB 150118C: Fermi GBM Detection
  11. GRB 150120B: Swift-XRT refined Analysis
  12. GRB 150120A: Fermi GBM observation
  13. GRB 150101B/Swift J123205.1-105602: XMM-Newton observation
  14. GRB 150118B: Fermi GBM Detection
  15. GRB 150118B: Fermi-LAT detection
  16. GRB 150110C: Swift-XRT observations
  17. GRB 150110B: Swift-XRT refined Analysis
  18. GRB 150110B: Fermi GBM Detection
  19. GRB 150110A: Fermi GBM Detection
  20. GRB 150101B/Swift J123205.1-105602: Chandra observations
  21. GRB 150105A: Fermi GBM detection
  22. GRB 150103A: Swift-XRT refined Analysis
  23. GRB 150101B: Fermi GBM detection
  24. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  25. GRB 150101A: Fermi GBM detection
  26. GRB 150101A: Swift-XRT refined Analysis
  27. Swift-XRT and UVOT follow-up of iPTF14jko (GRB 141230A)
  28. GRB 141230A: Fermi GBM detection
  29. GRB 141229A: Swift-XRT observations
  30. GRB 141229A: Fermi GBM detection
  31. GRB 141225A: MASTER-SAAO OT light curve
  32. GRB 141225A: Fermi GBM detection
  33. GRB 141225A: Swift-XRT refined Analysis
  34. Swift XRT and UVOT observations of GRB141222A
  35. GRB 141222A: Fermi GBM detection
  36. GRB 141222A: Fermi-LAT detection
  37. GRB 141215A: further Swift-XRT observations and afterglow detection
  38. GRB 141221A: Fermi GBM observation
  39. GRB 141221A: Swift-XRT refined Analysis
  40. GRB 141220A: Fermi GBM observation
  41. GRB 141220A: Swift-XRT refined Analysis
  42. GRB 141215A: Swift-XRT observations
  43. GRB 141215A: Fermi GBM detection
  44. GRB 141212B: Swift-XRT refined Analysis
  45. GRB 141212A: Swift-XRT refined Analysis
  46. GRB 141207A: Swift-XRT afterglow candidate detection
  47. GRB 141207A: Fermi GBM detection
  48. GRB 141207A: Swift-XRT observations
  49. GRB 141207A: Fermi-LAT Detection
  50. GRB 141205A: Fermi GBM detection
  51. GRB 141205A: XRT observations
  52. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  53. GRB 141202A: Swift XRT observations
  54. GRB 141202A: Fermi GBM Detection
  55. GRB 141130A: Swift-XRT refined Analysis
  56. GRB 141121A: TSHAO optical observations
  57. GRB 141121A: TSHAO optical observations
  58. GRB 141118A: Fermi GBM Detection
  59. GRB 141121A: Swift-XRT refined Analysis
  60. GRB 141104A: further Swift-XRT observations and afterglow candidate
  61. GRB 141109A: Terskol photometry
  62. Konus-Wind observation of GRB 141109A
  63. GRB141109A : Xinglong TNT optical observation
  64. GRB 141109B: Swift-XRT refined Analysis
  65. GRB 141109A: Swift-XRT refined Analysis
  66. GRB 141104A: Swift-XRT observations
  67. GRB 141028A: TShAO optical observation
  68. GRB 141102A: Fermi-LAT detection
  69. GRB 141102A: Fermi GBM detection
  70. GRB 141031B: Swift-XRT refined Analysis
  71. GRB 141031A: Swift-XRT refined Analysis
  72. GRB 141031A: Fermi GBM detection
  73. GRB 141028A: SAO RAS Zeiss-1000 photometry
  74. GRB 141029B: Fermi GBM detection
  75. GRB 141028A: Swift-XRT observations
  76. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  77. GRB 141028A: Fermi GBM detection
  78. GRB 141028A: Fermi-LAT detection
  79. GRB 141026A: SAO RAS Zeiss-1000 observations
  80. GRB 141026A: Swift-XRT refined Analysis
  81. GRB141022A: Fermi GBM Detection
  82. GRB141022B: Fermi GBM Detection
  83. GRB 141022A: Swift-XRT refined Analysis
  84. GRB 141020A: Swift-XRT refined Analysis
  85. GRB 141015A: Swift-XRT afterglow confirmation and refined Analysis
  86. GRB 141017A: Swift-XRT refined Analysis
  87. GRB 141011A: Fermi GBM detection
  88. GRB 141004A: Fermi GBM observation
  89. GRB 141004A: Swift-XRT refined Analysis
  90. GRB 141005A: Swift-XRT refined Analysis
  91. GRB 141005A: Fermi GBM Detection
  92. Swift observations of HD 305560
  93. GRB 140928A: Swift-XRT follow-up observations
  94. GRB 140930B: Keck NIR imaging
  95. GRB 140930B: Swift-XRT refined Analysis
  96. GRB 140928A: Fermi GBM detection
  97. GRB 140928A: Swift-XRT observations
  98. GRB 140928A: Fermi-LAT detection
  99. GRB 140927A: Swift-XRT refined Analysis
  100. GRB 140919A: Swift-XRT refined Analysis

Advanced

Download all Circulars as a .tar.gz archive:
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