Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

28102 results found.

  1. Swift trigger 306323: Swift-BAT/XRT refined analysis
  2. GRB 080315: Optical observations
  3. GRB 080315: TAROT Calern observatory optical observations
  4. GRB 080315: Swift detection of a possible burst
  5. GRB 080307: GAO 150cm telescope Optical Observation
  6. GRB 080229A: GAO 150cm telescope Optical Observation
  7. GRB 080310, Swift-BAT refined analysis
  8. GRB080210: optical observations
  9. GRB 080310: Swift-XRT refined analysis
  10. GRB 080310: Swift/UVOT Refined Analysis
  11. GRB 080310 - SDSS Pre-Burst Observations
  12. GRB 080310: Enhanced Swift-XRT position
  13. GRB 080310: RRM optical photometry with the VLT
  14. GRB080310, optical observations with LBT
  15. GRB 080310: REM observations
  16. GRB 080310: Swift detection of a burst with optical afterglow
  17. GRB080307, optical upper limit
  18. GRB080229, optical upper limit
  19. GRB 080307: Swift-XRT Team refined analysis
  20. GRB 080307: Swift/UVOT Upper Limits
  21. GRB 080307, Swift-BAT refined analysis
  22. GRB080307 - SDSS Pre-Burst Observations
  23. GRB 080307: TNT optical observation
  24. GRB080307: Optical upper limits
  25. GRB 080307: Gemini-N i-band observations - candidate afterglow
  26. GRB 080307: retraction of UVOT candidate
  27. GRB 080307: Enhanced Swift-XRT position
  28. GRB 080307, Preliminary Swift-BAT refined analysis
  29. GRB 080307: Optical observation with DMC/KANATA
  30. GRB 080307: Swift detection of a burst
  31. VLA possible radio detection of GRB 080229
  32. GRB 080303, Swift-BAT refined analysis
  33. GRB080303: Swift XRT refined analysis
  34. GRB 080303: Enhanced Swift-XRT position
  35. Swift UVOT observations of GRB080229B
  36. GRB080229B: Swift XRT afterglow observation
  37. GRB 080303: Swift detection of a burst with optical afterglow
  38. GRB 080303: REM NIR afterglow candidate
  39. GRB 080303A: ROTSE-III Optical Limits
  40. GRB 080229: I-band observations from OSN
  41. GRB 080229: VLT NIR observations
  42. GRB080229: Swift XRT refined analysis
  43. GRB 080229: TNG NIR observations
  44. GRB 080229: Enhanced Swift-XRT position
  45. GRB 080229: REM NIR observations
  46. GRB080229: Possible optical afterglow
  47. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  48. UVOT analysis for GRB080229
  49. GRB 080229, Swift-BAT refined analysis
  50. GRB 080229A: ROTSE-III Optical Limits
  51. GRB 080229: Swift detection of a bright burst
  52. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  53. Swift-XRT improved positions, and new redshift limits.
  54. ESO optical and NIR observations of GRB 080218B
  55. GRB 080204: Suzaku WAM observation of the prompt emission
  56. GRB 080218B, Swift-BAT refined analysis
  57. GRB 080218B: Swift-XRT refined analysis
  58. Swift/UVOT observations of GRB080218B
  59. GRB 080218B: REM NIR early upper limits
  60. GRB 080218B: Enhanced Swift-XRT position
  61. GRB 080218B: GROND upper limits
  62. GRB 080218A, Swift-BAT refined analysis
  63. GRB 080211: Suzaku WAM observation of the prompt emission
  64. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  65. VLA radio upper limit on GRB 080212
  66. Swift/UVOT refined analysis of GRB080212
  67. GRB 080212, Swift-BAT refined analysis
  68. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  69. GRB 080212: GROND detects afterglow
  70. GRB 080212: REM NIR afterglow?
  71. GRB 080212: Enhanced Swift-XRT position
  72. GRB 080212: Swift-XRT Team refined analysis
  73. GRB 080210: Keck photometry
  74. VLA non-detection of GRB 080210
  75. GRB 080212: Swift detection of a burst
  76. GRB 080207: VLT NIR early upper limits
  77. GRB 080210: Swift/UVOT Refined Analysis
  78. GRB 080210, Swift-BAT refined analysis
  79. GRB 080210: Super-LOTIS observations
  80. GRB 080210: Swift-XRT Refined Analysis
  81. GRB 080210: Enhanced Swift-XRT position
  82. GRB 080210: GOND detection in all bands and redshift upper limit
  83. GRB080210 - SDSS Pre-Burst Observations
  84. GRB 080210: Swift detection of a burst with optical afterglow
  85. GRB 080210: TAROT La Silla observatory optical detection
  86. GRB 080207: GROND upper limits
  87. GRB 080205: GAO 150cm telescope Optical limit
  88. GRB 080207, Swift-BAT refined analysis
  89. GRB 080207: Optical limits from Gemini-South
  90. Swift detection of AX J1749.1-2639
  91. GRB 080207: Super-LOTIS observations
  92. GRB 080207, Swift-BAT refined analysis
  93. Swift Trigger 302777 is not a GRB
  94. GRB080207: RTT150 Optical Observations
  95. GRB 080207: REM NIR observations
  96. GRB080207: Swift/UVOT refined analysis
  97. GRB 080207: TAROT Calern observatory optical observations
  98. GRB 080207: Swift-XRT Refined Analysis
  99. GRB 080207: Enhanced Swift-XRT position
  100. GRB 080207: Swift detection of a burst

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