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"

19668 results found.

  1. GRB 080320 - SDSS Pre-Burst Observations
  2. GRB 080320: Swift detection of a burst
  3. GRB 080320: ROTSE-III Optical Limits
  4. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  5. GRB 080319B: optical observations
  6. Swift-BAT trigger 306829 is IGR J16479-4514
  7. GRB 080319B: RAPTOR observations of a naked eye burst
  8. GRB 080319A: Swift-XRT Team Refined Analysis
  9. GRB 080319B, Swift-BAT refined analysis
  10. GRB 080319C: Swift-XRT Team Refined Analysis
  11. GRB 080319B: Swift-XRT Team Refined Analysis
  12. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  13. GRB 080319C: AGILE-MCAL observation of the prompt emission
  14. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  15. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  16. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  17. GRB 080319B: TORTORA synchronous observation
  18. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  19. GRB 080319B: Enhanced Swift-XRT position
  20. GRB 080319A: Enhanced Swift-XRT position
  21. GRB 080319A, Swift-BAT refined analysis
  22. GRB 080319C: Early Super-LOTIS Observations
  23. GRB 080319C: Swift detection of a burst with an optical afterglow
  24. GRB 080319C: KAIT OA candidate
  25. GRB 080319b prompt optical observation by Pi-of-the-Sky
  26. GRB 080319B: Gemini-South Spectroscopy
  27. GRB080319B Liverpool Telescope optical afterglow candidate
  28. GRB 080319B: Super-LOTIS Detection of a Bright OT
  29. GRB 080319B: KAIT OA
  30. GRB 080319B: UVOT Position
  31. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  32. GRB 080319A: Swift detection of a burst
  33. Swift Trigger 306745 is not a GRB
  34. Swift Trigger 306616 is not a GRB
  35. Swift/UVOT observations of GRB 080315
  36. Swift trigger 306323: Swift-BAT/XRT refined analysis
  37. SAX J1818.6-1703: Swift detection (trigger 306379)
  38. GRB 080315: TAROT Calern observatory optical observations
  39. GRB 080315: Swift detection of a possible burst
  40. GRB 080310: ROTSE-III Observations of Optical Counterpart
  41. GRB 080310, Swift-BAT refined analysis
  42. GRB 080310: Swift-XRT refined analysis
  43. GRB 080310: Swift/UVOT Refined Analysis
  44. GRB 080310 - SDSS Pre-Burst Observations
  45. GRB 080310: Enhanced Swift-XRT position
  46. GRB 080310: VLT/UVES spectroscopy
  47. GRB080310: Super-LOTIS suggestion of brightening
  48. GRB 080310: Swift detection of a burst with optical afterglow
  49. GRB080229, optical upper limit (Correction)
  50. GRB080307, optical upper limit
  51. GRB080229, optical upper limit
  52. GRB 080307: Swift-XRT Team refined analysis
  53. GRB 080307: Swift/UVOT Upper Limits
  54. GRB 080307: Early RAPTOR Limits
  55. GRB 080307, Swift-BAT refined analysis
  56. GRB080307 - SDSS Pre-Burst Observations
  57. GRB 080307: retraction of UVOT candidate
  58. GRB 080307: Enhanced Swift-XRT position
  59. GRB 080307, Preliminary Swift-BAT refined analysis
  60. GRB 080307: Swift detection of a burst
  61. VLA possible radio detection of GRB 080229
  62. GRB 080303: Swift/UVOT follow-up of afterglow detection
  63. GRB 080303, Swift-BAT refined analysis
  64. GRB080303: Swift XRT refined analysis
  65. GRB 080303: Enhanced Swift-XRT position
  66. Swift UVOT observations of GRB080229B
  67. GRB080229B: Swift XRT afterglow observation
  68. GRB 080303A: Faulkes Telescope South optical afterglow observations
  69. GRB 080303: Swift detection of a burst with optical afterglow
  70. GRB 080303A: ROTSE-III Optical Limits
  71. GRB 080229: I-band observations from OSN
  72. GRB080229: Swift XRT refined analysis
  73. GRB 080229: Enhanced Swift-XRT position
  74. UVOT analysis for GRB080229
  75. GRB 080229, Swift-BAT refined analysis
  76. GRB 080229: Faulkes Telescope South optical limit
  77. GRB 080229A: ROTSE-III Optical Limits
  78. GRB 080229: Swift detection of a bright burst
  79. Swift-XRT improved positions, and new redshift limits.
  80. ESO optical and NIR observations of GRB 080218B
  81. GRB 080204: Suzaku WAM observation of the prompt emission
  82. GRB 080218B, Swift-BAT refined analysis
  83. GRB 080218B: Swift-XRT refined analysis
  84. Swift/UVOT observations of GRB080218B
  85. GRB 080218B: Enhanced Swift-XRT position
  86. GRB 080218B: GROND upper limits
  87. GRB 080218A, Swift-BAT refined analysis
  88. GRB080218B: Watcher prompt limit
  89. GRB 080218B: Swift detection of a burst
  90. GRB 080218: Swift detection of a burst
  91. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  92. VLA radio upper limit on GRB 080212
  93. Swift/UVOT refined analysis of GRB080212
  94. GRB 080212, Swift-BAT refined analysis
  95. GRB 080212: GROND detects afterglow
  96. GRB 080212: optical observations
  97. GRB 080212: Enhanced Swift-XRT position
  98. GRB 080212: Swift-XRT Team refined analysis
  99. GRB 080210: Keck photometry
  100. VLA non-detection of GRB 080210

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