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"

41602 results found.

  1. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  2. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  3. GRB 090102: HST observations and host galaxy
  4. GRB 090126C: Fermi GBM detection
  5. GRB 090126A: Swift-XRT Refined Analysis
  6. GRB 090126B: Fermi GBM detection
  7. GRB 090126: SuperAGILE Localization of a Long GRB
  8. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  9. GRB 090118: no afterglow candidate
  10. GRB 090123: GROND detection
  11. 1E1547.0-5408: Swift detection of dust halo
  12. GRB 090123: Swift XRT refined analysis
  13. GRB 090123: Swift/UVOT Observations
  14. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  15. GRB 090123: Swift-BAT refined analysis
  16. GRB090123: Enhanced Swift-XRT position
  17. GRB 090123: Swift detection of a burst
  18. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  19. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  20. Swift-BAT trigger 340734 is not a GRB
  21. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  22. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  23. GRB 090117C: Suzaku WAM observation of the prompt emission
  24. AXP 1E1547.0-5408: Fermi GBM observations
  25. Trigger 340734: Swift detection of a possible short burst
  26. AXP 1E1547.0-5408 activity with SGR bursts
  27. GRB 090118: KPNO 4m 2nd Epoch Observations
  28. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  29. GRB 090118: Swift-XRT observations
  30. GRB090118 Swift/UVOT upper limits
  31. GRB 090118: GROND Upper Limits
  32. GRB 090118: Possible burst detection from Swift-BAT slew data
  33. GRB 090117B : Fermi GBM detection
  34. GRB 090117C - Fermi GRB Detection
  35. GRB 090117 - Fermi GBM Observations
  36. GRB 090117: GROND Upper Limits
  37. GRB090117 Swift/UVOT upper limits
  38. GRB090117: Swift-XRT detection of a possible candidate afterglow
  39. GRB 090117 - SuperAGILE Localization of a long GRB
  40. GRB090102: MAGIC telescope GeV observation
  41. GRB 090112B: Suzaku WAM observation of the prompt emission
  42. GRB 090113: GROND Upper Limits
  43. GRB 090113: Swift-XRT refined analysis
  44. GRB 090113: Observations from NOT
  45. GRB 090113: Enhanced Swift-XRT position
  46. GRB 090113: Swift-BAT refined analysis
  47. GRB 090113: ROTSE-III Optical Limits
  48. GRB090113: XRT position
  49. GRB 090112B: Fermi GBM Detection
  50. GRB 090113: Swift detection of a burst
  51. GRB 090112: Fermi GBM detection
  52. GRB 090109: Fermi GBM detection
  53. GRB 090108B: Fermi GBM detection
  54. GRB 090111, Swift-BAT refined analysis
  55. GRB 090111: Swift UVOT Upper Limits
  56. GRB 090108: Fermi GBM Detection
  57. GRB 090111: Swift-XRT refined analysis
  58. GRB 090111: Enhanced Swift-XRT position
  59. GRB 090111: Swift detection of a burst
  60. GRB 090107B: Suzaku WAM observation of the prompt emission
  61. GRB090107B: Fermi GBM Detection
  62. GRB 090102: WSRT Radio Observations
  63. GRB 090107B: Swift XRT afterglow confirmation
  64. GRB 090107B: Swift/UVOT Observations
  65. GRB 090107B: Swift-XRT detection of possible afterglow
  66. GRB 090107B optical observations
  67. GRB 090107B: a long GRB localized by INTEGRAL
  68. Fermi/GBM detection of GRB 081226A
  69. Fermi/GBM detection of GRB 081225
  70. GRB 090107: Swift-BAT refined analysis
  71. GRB 090107: Swift detection of a burst
  72. GRB 081231: Fermi GBM Detection
  73. GRB 090102: optical decay
  74. VLA radio upper limit on GRB 090102
  75. Swift triggered on the HMXB 1A 1118-61
  76. Konus-Wind observation of GRB 090102
  77. GRB 081229: Fermi GBM detection
  78. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  79. GRB 090102: P60 Imaging and P200 Spectroscopy
  80. GRB 090102 Observations from IAC80
  81. GRB 090102: GROND observations of the optical afterglow
  82. Swift UVOT observations of GRB 090102
  83. GRB 090102: Swift-BAT refined analysis
  84. GRB 090102: Swift burst of interest
  85. GRB 090102: Swift XRT refined analysis
  86. GRB 090102: NOT redshift
  87. GRB 090102: Enhanced Swift-XRT position
  88. GRB 090102: TAROT Calern observatory optical light curve
  89. GRB 090102: REM observations of a bright afterglow
  90. GRB 090102: Swift detection of a burst with an optical counterpart
  91. GRB 090102: TAROT Calern observatory optical observations
  92. GRB 081230: GROND confirmation of the afterglow
  93. GRB 081230, Swift-BAT refined analysis
  94. GRB081230: Swift-XRT refined analysis
  95. GRB 081230 Swift/UVOT Observations
  96. GRB 081230: Enhanced Swift-XRT position
  97. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  98. GRB 081230: ROTSE-III Detection of Optical Counterpart
  99. GRB 081230: Swift detection of a burst
  100. GRB 081228: GROND confirmation of the optical/NIR afterglow

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