Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

42538 results found.

  1. GRB 131018B: Swift-XRT observations
  2. GRB 131018B: Fermi GBM observation
  3. GRB 131018A: RATIR Optical and NIR Observations
  4. GRB 131018A: Swift/UVOT Upper Limits
  5. GRB 131018B: Fermi-LAT detection of a burst
  6. GRB 131018A: Swift-XRT refined Analysis
  7. GRB 131018A: KAIT Optical Upper Limit
  8. GRB 131018A, Swift-BAT refined analysis
  9. GRB 131018A: P60 Observations
  10. GRB 131018A: Enhanced Swift-XRT position
  11. GRB 131014A: XRT position information
  12. GRB131018A, optical observations
  13. GRB 131018A: Swift detection of a burst
  14. GRB 131014A: Suzaku WAM observation of the prompt emission
  15. GRB 131014A: GROND observations
  16. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  17. Fermi GBM data availability during U.S. government shutdown
  18. GRB 131014A: Swift-XRT refined Analysis
  19. GRB 131011A: Swift/UVOT Upper Limits
  20. GRB 131014A: Swift/UVOT Upper Limits
  21. Fermi 403206457 / GRB 131011A: AAO optical observations
  22. GRB 131014A: RATIR Optical and NIR Observations
  23. GRB 131014A: Enhanced XRT position
  24. Konus-Wind observation of GRB 131014A
  25. GRB 131014A: NOT afterglow candidate
  26. GRB 131014A: Nanshan optical observations
  27. GRB 131014A: Swift detection of a possible X-ray afterglow
  28. GRB 131014A Tiled Swift observations
  29. GRB 131014A: Fermi-LAT detection
  30. GRB 131014A: Fermi GBM detection
  31. GRB 131011A: Fermi GBM detection
  32. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  33. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  34. GRB 131011A: GROND afterglow observations
  35. Fermi403206457: continued P60 observations and fading behavior
  36. Fermi403206457: Weihai optical upper limit
  37. Fermi403206457: NOT optical observations
  38. Fermi403206457: iPTF detection of a possible optical afterglow
  39. Trigger 574266 is not a Swift detection of a known source
  40. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  41. GRB 130831A: Continued RATIR Optical and NIR Observations
  42. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  43. GRB 131004A: MOSFIRE NIR imaging
  44. GRB 131004A: Correction to XRT refined analysis
  45. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  46. GRB 131004A, Swift-BAT refined analysis
  47. GRB 131004A: Fermi GBM observation
  48. GRB 131004A: CARMA 93 GHz upper limit
  49. GRB 131004A: Swift/UVOT Detection
  50. GRB 131004A: RATIR Optical and NIR Upper Limits
  51. GRB 131004A: Swift-XRT refined Analysis
  52. GRB131004A: TNG Redshift confirmation
  53. GRB 131004A: GROND observations of the afterglow
  54. GRB 131004A: Enhanced Swift-XRT position
  55. GRB131004A: Magellan Redshift
  56. GRB 131004A: Liverpool Telescope optical afterglow observations
  57. GRB 131004A: TNG optical afterglow confirmation
  58. GRB 131004A: optical afterglow from the NOT
  59. GRB 131004A: Swift detection of a burst (may be short)
  60. GRB 131002A, Swift-BAT refined analysis
  61. GRB 130925A: 3mm observations with CARMA
  62. GRB 131002A: Fermi GBM observation
  63. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  64. GRB 131002B, Swift-BAT refined analysis
  65. GRB 131002B: GROND upper limits
  66. GRB 131002B: Swift-XRT Refined Analysis
  67. GRB 131002B: Swift/UVOT Upper Limits
  68. GRB 131002A: Swift/UVOT Detection
  69. GRB 131001A, Swift-BAT refined analysis
  70. GRB 131002A: Swift-XRT refined Analysis
  71. GRB 131002B: Enhanced Swift-XRT position
  72. GRB 131002A: ISON-NM optical observations
  73. Swift J1242.9-3530, Swift-BAT refined analysis
  74. GRB 131001A: Swift UVOT and XRT Upper Limits
  75. GRB 131002A: Enhanced Swift-XRT position
  76. NuSTAR observations of GRB 130925A
  77. GRB 131002B: Swift detection of a burst
  78. GRB 131002A: Swift detection of a burst
  79. GRB 131002A: Faulkes Telescope North optical afterglow
  80. GRB 131001A detected in ground analysis of Swift-BAT data
  81. GRB 130925A: continuing Swift/XRT monitoring
  82. IPN Observations of GRB 130925A
  83. GRB 130930A: Swift detection of a burst
  84. GRB 130929A: Swift/UVOT Upper Limits
  85. GRB 130831A: Continued RATIR Optical and NIR Observations
  86. GRB 130929A: Swift-XRT refined Analysis
  87. GRB 130929A, Swift-BAT refined analysis
  88. GRB 130929A: Enhanced Swift-XRT position
  89. GRB 130929A: TAROT La Silla observatory optical observations
  90. GRB 130929A: Swift detection of a burst
  91. Fermi LAT Upper Limits on GRB 130925A
  92. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  93. GRB 130925A: Swift/UVOT Upper Limits
  94. GRB 130925A: sub-mm non-detection with SMA
  95. GRB 130925A: optical upper limit
  96. GRB 130925A: Continued RATIR Optical and NIR Observations
  97. GRB 130925A: Fermi GBM Detection
  98. Konus-Wind observation of GRB 130925A
  99. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  100. GRB 130925A: RATIR Optical and NIR 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