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"

6803 results found.

  1. GRB 081029: Swift-BAT refined analysis
  2. GRB081029: Swift XRT refined analysis
  3. GRB 081029: UVES/VLT Absorption Redshift
  4. GRB 081028B: Fermi GBM detection
  5. GRB 081028: Swift-XRT refined analysis
  6. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  7. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  8. GRB 081024B: Swift-XRT further observations
  9. Swift UVOT observations of GRB081024B
  10. GRB 081025: Swift-XRT position
  11. GRB 081024B: Swift-XRT observations
  12. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  13. Fermi-LAT observation of GRB 081024B
  14. GRB 081016A: Swift-XRT refined analysis
  15. GRB 081011: Swift XRT refined analysis
  16. GRB 081016B: Swift-XRT Team refined Analysis
  17. GRB 081016: Swift-XRT candidate afterglow detection
  18. GRB 081008: Swift-XRT Refined Analysis
  19. GRB081006B: Fermi GBM detection
  20. GRB081006: Fermi GBM detection
  21. GRB 081007: Swift-XRT Team refined analysis
  22. GRB081003C: GLAST Burst Monitor detection
  23. GRB 081003B: Swift-XRT upper limit
  24. GRB 081003A: Swift-XRT Team position and analysis
  25. GRB 080928: Fermi GBM detection
  26. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  27. GRB 081001: Swift UVOT Observations
  28. GRB 081001: Swift-XRT position
  29. GRB 080928: Swift-XRT refined analysis
  30. GRB 080925: Fermi GBM Detection
  31. Swift trigger 325707: Swift-XRT upper limit
  32. GRB 080913B: Fermi GBM detection
  33. GRB 080919: Swift/UVOT Refined Analysis
  34. GRB 080919: Swift-XRT refined analysis
  35. GRB 080916C: IRSF/SIRUS NIR Observation
  36. GRB 080916C: Swift XRT refined analysis
  37. GRB 080916B: Swift-XRT refined analysis
  38. GRB 080916C: Fermi GBM Detection
  39. GRB 080916A: Swift XRT refined analysis
  40. GRB 080912 : Fermi GBM detection
  41. GRB 080915: Swift-XRT afterglow detection and analysis
  42. GRB 080913: Swift-XRT refined analysis
  43. GRB 080906B: Fermi GBM detection
  44. GRB 080905C: Fermi GBM detection
  45. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  46. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  47. GRB 080906: Swift-XRT Refined Analysis
  48. GRB 080905A: Swift-XRT Refined Analysis
  49. GRB 080903: Swift-XRT Refined Analysis
  50. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  51. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  52. SGR 0501+4516: Detection of possible optical counterpart
  53. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  54. GRB080825B: Swift/UVOT Upper Limits
  55. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  56. Enhanced Swift-XRT position of SGR 0501+4516
  57. SGR 0501+4516: Swift XRT measure of the spin period
  58. GRB080823: Fermi Gamma-ray Burst Monitor detection
  59. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  60. GRB080825C: GLAST Burst Monitor detection
  61. GRB 080825B: Swift-XRT team analysis
  62. SGR 0501+4516: Astrotel-Caucasus optical observations
  63. GRB080818B: GLAST Burst Monitor detection
  64. GLAST Burst Monitor detection of GRB 080818
  65. GLAST Burst Monitor detection of GRB080816
  66. GLAST Burst Monitor detection of GRB 080810
  67. GRB080810: MITSuME optical observation
  68. GRB 080810: Liverpool Telescope observations
  69. GRB 080810: Swift-XRT Team refined analysis
  70. GRB 080810: KANATA optical-NIR observation, update
  71. GRB 080723B: XMM-Newton observation
  72. GRB 080805: Swift-XRT Refined Analysis
  73. GRB 080804: Swift-XRT Refined Analysis
  74. GRB 080727C: Swift XRT refined analysis
  75. GRB 080727B: Swift-XRT refined analysis
  76. GRB 080727A: Swift-XRT refined analysis
  77. GRB080723B: Swift/UVOT Upper Limits
  78. GRB 080723B - Swift-XRT refined analysis
  79. GRB 080723B - Swift-XRT position
  80. GRB 080723A: Swift-XRT refined analysis
  81. GRB 080721 : Lulin 2nd optical follow-ups
  82. GRB 080721: OA fading and redshift
  83. TNG/DOLORES redshift for GRB080721
  84. GRB 080721: Swift-XRT refined analysis
  85. GRB 080702B: Swift XRT confirmation of the afterglow
  86. GRB 080710: Swift-XRT refined analysis
  87. GRB 080707: possible break in the X-rays
  88. GRB 080707: Swift XRT refined analysis
  89. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  90. GRB 080703: Swift-XRT refined analysis
  91. GRB 080702B: Swift XRT and UVOT observations
  92. GRB 080702A: Swift-XRT Team refined analysis
  93. Swift Trigger 315630: TLS R-band observation
  94. TLS I-Band Observation of GRB 080701A
  95. GRB 080625:Swift-XRT detection of the afterglow
  96. Swift trigger 314975 is not a GRB
  97. GRB 080613A: Swift-XRT detection of the afterglow
  98. GRB 080613B - NOT optical and IR nondetections
  99. Swift observations of BAT Slew Survey event (Trigger=010)
  100. GRB 080603A: final Swift-XRT 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