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"

11841 results found.

  1. GRB 090418A: Konus-Wind and Swift/BAT joint spectral analysis
  2. GRB 090418B: RTT150 optical observations
  3. GRB 090418A: RTT150 optical observations
  4. GRB 090418B: GROND observations
  5. Konus-Wind observation of GRB 090418B
  6. GRB 090418A: ROTSE-III Refined Analysis
  7. GRB 090418: Swift detection of a burst with optical afterglow
  8. GRB 090411B: Suzaku WAM observation of the prompt emission
  9. GRB 090411A: Suzaku WAM observation of the prompt emission
  10. GRB 090417B: MITSuME Okayama optical upper limits
  11. GRB 090417A: Early-type nature of the putative host
  12. GRB 090417A: nearby galaxy redshift
  13. GRB 090417B: Swift detection of a burst
  14. GRB 090411A: Fermi GBM detection
  15. Konus-Wind and Konus-RF observations of GRB 090408b
  16. GRB 090409: Fermi GBM detection
  17. GRB 090407: GROND upper limits
  18. GRB 090407: Swift-XRT refined analysis
  19. Konus-Wind and Konus-RF observations of GRB 090406
  20. GRB 090407: ROTSE-III Optical Limits
  21. GRB 090407: Swift detection of a burst
  22. GRB 090404: NOT observations
  23. GRB 090404: Swift-XRT Team refined analysis
  24. Konus-Wind observation of GRB 090401B
  25. GRB 090328: Fermi-LAT refined analysis
  26. GRB 090331: Fermi GBM detection
  27. Konus-Wind observation of GRB 090401A
  28. Swift/UVOT detection of GRB090401B
  29. GRB 090401B: Swift detection of a burst
  30. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  31. GRB 090401, Swift-BAT refined analysis
  32. GRB 090328: Swift XRT refined analysis
  33. Konus-Wind observation of GRB 090328
  34. Fermi LAT and GBM detections of GRB090328
  35. Konus-Wind observation of GRB 090323
  36. GRB 090324: SuperAGILE Localization of a Long GRB
  37. GRB 090323: P60 Afterglow Confirmation
  38. SGR J1550-5418: two Fermi GBM triggers on March 22
  39. GRB 090320C: Fermi GBM Detection
  40. Fermi GBM and LAT detections of GRB 090323
  41. GRB 090320B: Fermi GBM detection.
  42. GRB 090320A: Fermi GBM detection
  43. GRB 090313: WSRT Radio Detection
  44. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  45. GRB 090313: VLT spectroscopy
  46. Konus-Wind observation of GRB 090315
  47. GRB 090313: TAROT La Silla observatory optical detection
  48. GRB 090313: Gemini-S redshift
  49. GRB 090313: Swift-BAT refined analysis
  50. GRB 090313: Sustained optical brightness
  51. GRB090305B: Fermi GBM detection
  52. GRB 090308: Swift-XRT refined analysis
  53. ATCA observation of SGR J1550-5418
  54. GRB 090308: Swift detection of a burst
  55. GRB 090307: Swift-BAT refined analysis of trigger 345551
  56. GRB 090306: Swift detection of a possible burst
  57. GRB 090303: Fermi GBM detection
  58. Konus-RF catches first GRB and SGR bursts
  59. GRB 090228B: Fermi GBM detection
  60. Konus-Wind observation of bright short GRB 090227B
  61. IPN localization of short bright GRB 090227B
  62. Konus-Wind observation of GRB 090301A
  63. GRB 090301A: Swift-BAT refined analysis
  64. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  65. GRB 090227: Fermi GBM detection
  66. SGR J1550-5418
  67. Ongoing activity of AXP/SGR 1E1547.0-5408
  68. Konus-Wind observation of GRB 090217
  69. GRB090217: Fermi-LAT Detection
  70. SGR activity seen by BAT during ICSP Ionospheric Events
  71. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  72. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  73. GRB 090205: VLT spectroscopic redshift
  74. GRB 090205: Swift detection of a burst
  75. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  76. Konus-Wind observation of GRB 090201
  77. GRB 090201: Swift-XRT refined analysis
  78. GRB 090201: Swift-BAT refined analysis
  79. GRB090113: MAGIC telescope GeV observation
  80. GRB 090201: ROTSE-III Optical Limits
  81. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  82. GRB 090129: Swift detection of a burst
  83. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  84. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  85. GRB 090126: SuperAGILE Localization of a Long GRB
  86. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  87. GRB 090123: Swift/UVOT Observations
  88. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  89. Trigger 340734: Swift detection of a possible short burst
  90. AXP 1E1547.0-5408 activity with SGR bursts
  91. GRB 090118: Subaru NIR Observation
  92. GRB 090118: Swift-XRT observations
  93. GRB090118 Swift/UVOT upper limits
  94. GRB 090118: Possible burst detection from Swift-BAT slew data
  95. GRB 090117 - SuperAGILE Localization of a long GRB
  96. GRB 090113: GROND Upper Limits
  97. GRB 090113: Swift-XRT refined analysis
  98. GRB 090113: Observations from NOT
  99. GRB 090113: ROTSE-III Optical Limits
  100. GRB 090113: Swift detection of a burst

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