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"

32753 results found.

  1. Swift Trigger 345551 is probably not a GRB
  2. GRB 090305: Swift/UVOT Upper Limits
  3. GRB 090305: Swift-XRT refined analysis
  4. GRB 090305, Swift-BAT refined analysis
  5. GRB 090227A: Suzaku WAM observation of the prompt emission
  6. GRB 090305: Magellan confirmation of the optical afterglow
  7. GRB090305: GMOS-S Candidate Optical Afterglow
  8. GRB 090301A: Suzaku WAM observation of the prompt emission
  9. Konus-RF catches first GRB and SGR bursts
  10. Konus-Wind observation of bright short GRB 090227B
  11. IPN localization of short bright GRB 090227B
  12. Konus-Wind observation of GRB 090301A
  13. GRB 090301A: Swift-BAT refined analysis
  14. SGR J1550-5418
  15. GRB 081211B: Nearby cluster
  16. GRB 090217: Suzaku WAM observation of the prompt emission
  17. GRB090217: XRT analysis
  18. Konus-Wind observation of GRB 090217
  19. IPN localization of GRB 090217
  20. GRB090217: Fermi-LAT Detection
  21. SGR activity seen by BAT during ICSP Ionospheric Events
  22. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  23. VLA radio upper limit on GRB 090205
  24. GRB 090205: VLT optical decay
  25. GRB 090205: Swift/UVOT Upper Limits
  26. GRB 090205: VLT refined redshift
  27. GRB 090205: Swift-XRT refined analysis
  28. GRB 090205: VLT spectroscopic redshift
  29. GRB 090205: GROND observations and photometric redshift estimate
  30. GRB 090205: VLT candidate afterglow
  31. GRB 090205: Swift-BAT refined analysis
  32. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  33. GRB 090131: Suzaku WAM observation of the prompt emission
  34. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  35. GRB 090126A: Swift-XRT afterglow confirmation
  36. Konus-Wind observation of GRB 090201
  37. GRB 090201: Swift-XRT refined analysis
  38. GRB090201: Swift UVOT upper limits
  39. GRB 090201: object inside the enhanced XRT error circle
  40. GRB 090201: VLT NIR observations
  41. GRB 090201: Swift-BAT refined analysis
  42. GRB 090201: VLT afterglow candidate
  43. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  44. GRB090113: MAGIC telescope GeV observation
  45. GRB 090201: ROTSE-III Optical Limits
  46. GRB 090126A: Swift/UVOT Upper Limits
  47. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  48. GRB 090129: Swift-BAT refined analysis
  49. Suzaku ToO Observation of AXP 1E 1547.0-5408
  50. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  51. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  52. GRB 090102: HST observations and host galaxy
  53. GRB 090126A: Swift-XRT Refined Analysis
  54. GRB 090118: no afterglow candidate
  55. GRB 090123: GROND detection
  56. 1E1547.0-5408: Swift detection of dust halo
  57. GRB 090123: Swift XRT refined analysis
  58. GRB 090123: Swift/UVOT Observations
  59. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  60. GRB 090123: Swift-BAT refined analysis
  61. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  62. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  63. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  64. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  65. AXP 1E1547.0-5408: Fermi GBM observations
  66. Trigger 340734: Swift detection of a possible short burst
  67. GRB 090118: Subaru NIR Observation
  68. GRB 090118: KPNO 4m 2nd Epoch Observations
  69. GRB 090118 (BATSS): GRT Optical Observation
  70. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  71. GRB 090118: Swift-XRT observations
  72. GRB090118 Swift/UVOT upper limits
  73. GRB 090118: GROND Upper Limits
  74. GRB 090117: confirmation of the X-ray afterglow
  75. GRB 090117 - Fermi GBM Observations
  76. GRB 090117: GROND Upper Limits
  77. GRB090117 Swift/UVOT upper limits
  78. GRB 090112B: Suzaku WAM observation of the prompt emission
  79. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  80. GRB 090113: Swift UVOT upper limits
  81. GRB 090113: GROND Upper Limits
  82. GRB 090113: Swift-XRT refined analysis
  83. GRB 090113: Observations from NOT
  84. GRB 090113: Swift-BAT refined analysis
  85. GRB 090113: ROTSE-III Optical Limits
  86. GRB090113: XRT position
  87. GRB 090111, Swift-BAT refined analysis
  88. GRB 090111: Swift UVOT Upper Limits
  89. GRB 090111: Swift-XRT refined analysis
  90. GRB 090107B: Suzaku WAM observation of the prompt emission
  91. GRB090107B: Fermi GBM Detection
  92. GRB 090102: WSRT Radio Observations
  93. GRB 090107B: Swift XRT afterglow confirmation
  94. GRB 090107B: Swift/UVOT Observations
  95. GRB 090107B: Swift-XRT detection of possible afterglow
  96. GRB 090107B optical observations
  97. GRB 090107B: ROTSE-III Optical Limits
  98. Fermi/GBM detection of GRB 081226A
  99. GRB 090107: Swift-BAT refined analysis
  100. GRB 090102: optical decay

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