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"

15402 results found.

  1. Fermi LAT and GBM detections of GRB090328
  2. GRB 090323: Additional Lick observations
  3. GRB 090323: TLS detection at 5 days, no break
  4. GRB 090327: Fermi GBM detection
  5. GRB 090323: Fermi GBM Spectral Analysis
  6. GRB 090323 TLS detection - still bright
  7. GRB 090323: UVOT Detection of Afterglow
  8. GRB 090323: Swift-XRT refined analysis
  9. Konus-Wind observation of GRB 090323
  10. GRB 090324: SuperAGILE Localization of a Long GRB
  11. GRB 090323: P60 Afterglow Confirmation
  12. GRB 090323: GROND Detection of the Afterglow and Photo-z
  13. Fermi GBM and LAT detections of GRB 090323
  14. GRB 090320B: Fermi GBM detection.
  15. GRB 090319: Fermi GBM detection
  16. Further 15GHz observations of GRB090313
  17. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  18. GRB 090315: Suzaku WAM observation of the prompt emission
  19. GRB 090313: VLT spectroscopy
  20. Konus-Wind observation of GRB 090315
  21. IPN Triangulation of GRB090315 and Tupi Detection of Muon Increase
  22. GRB 090313, SMARTS optical/IR observations
  23. Further radio observation of GRB 090313
  24. Further Swift/UVOT observations of GRB 090313
  25. GRB 090313: MITSuME Okayama observation
  26. GRB 090313: Additional Gemini-S photometry
  27. GRB 090313: Light curve steepening
  28. GRB 090313: TAROT La Silla observatory optical detection
  29. GRB 090313 - PAIRITEL NIR detections
  30. GRB 090313 optical observations
  31. GRB 090313: Ongoing plateau phase
  32. GRB 090313: Swift/UVOT upper limits
  33. GRB 090306B: Confirmation of the X-ray afterglow
  34. GRB 090313: Sustained optical brightness
  35. GRB 090313, GROND observations
  36. GRB090310: Fermi GBM detection
  37. GRB 090309B: Fermi GBM detection
  38. GRB 090306B: INTEGRAL SPI-ACS light curve
  39. GRB 090308: GROND observations
  40. GRB 090308B: Fermi GBM detection
  41. GRB 090307B: Fermi GBM detection
  42. GRB 090306C: Fermi GBM detection
  43. GRB 090307: GROND Upper Limits
  44. GRB 090306B: GROND Upper Limits
  45. GRB 090305C: Suzaku WAM observation of the prompt emission
  46. GRB 090307: Swift-XRT afterglow confirmation and analysis
  47. GRB 090306B: Burst detection from Swift-BAT slew data
  48. GRB 090305, Swift-BAT refined analysis
  49. GRB 090227A: Suzaku WAM observation of the prompt emission
  50. GRB 090305: Magellan confirmation of the optical afterglow
  51. GRB 090301A: Suzaku WAM observation of the prompt emission
  52. Konus-RF catches first GRB and SGR bursts
  53. GRB 090228B: Fermi GBM detection
  54. Konus-Wind observation of bright short GRB 090227B
  55. Konus-Wind observation of GRB 090301A
  56. GRB 090301B: Fermi GBM detection
  57. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  58. GRB 090227: Fermi GBM detection
  59. GRB 090206: Fermi GBM detection
  60. SGR J1550-5418
  61. GRB 081211B: Nearby cluster
  62. GRB 090222: Fermi GBM detection
  63. GRB 090217: Suzaku WAM observation of the prompt emission
  64. Konus-Wind observation of GRB 090217
  65. GRB090217: Fermi-LAT Detection
  66. GRB 090217: Fermi GBM detection
  67. SGR activity seen by BAT during ICSP Ionospheric Events
  68. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  69. GRB 090205: Swift/UVOT Upper Limits
  70. GRB 090205: Swift-XRT refined analysis
  71. GRB 090205: Swift burst of interest
  72. GRB 090205: VLT spectroscopic redshift
  73. GRB 090205: GROND observations and photometric redshift estimate
  74. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  75. GRB 090131: Suzaku WAM observation of the prompt emission
  76. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  77. GRB 090126A: Swift-XRT afterglow confirmation
  78. Konus-Wind observation of GRB 090201
  79. GRB 090202: Fermi GBM detection
  80. GRB 090201: Swift-XRT refined analysis
  81. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  82. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  83. Suzaku ToO Observation of AXP 1E 1547.0-5408
  84. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  85. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  86. GRB 090126B: Fermi GBM detection
  87. GRB 090126: SuperAGILE Localization of a Long GRB
  88. GRB 090118: no afterglow candidate
  89. GRB 090123: GROND detection
  90. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  91. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  92. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  93. GRB 090117C: Suzaku WAM observation of the prompt emission
  94. AXP 1E1547.0-5408: Fermi GBM observations
  95. GRB 090118: Subaru NIR Observation
  96. GRB 090118: Possible burst detection from Swift-BAT slew data
  97. GRB 090117C - Fermi GRB Detection
  98. GRB 090117 - Fermi GBM Observations
  99. GRB090117 Swift/UVOT upper limits
  100. GRB 090117 - SuperAGILE Localization of a long GRB

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