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"

28232 results found.

  1. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  2. GRB 070611: ROTSE-III Optical Limits
  3. GRB 070610: Swift-UVOT Upper Limits
  4. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  5. GRB 070610, Swift-BAT refined analysis
  6. GRB 070412: TAROT Calern observatory optical observations
  7. GRB 070411: TAROT Calern observatory optical observations
  8. GRB070520B: optical observations
  9. GRB070520: optical observation
  10. GRB070518: optical observation
  11. GRB070521: optical observation
  12. GRB 070531: NOT nIR observations
  13. GRB 070531: Swift-BAT refined analysis
  14. GRB 070531: I-band observations from IAC80
  15. GRB 070531: Liverpool Telescope Optical Observations
  16. GRB 070529: SARA upper limit
  17. Swift/UVOT refined analysis of GRB070529
  18. GRB 070529: Optical aterglow from MIRO
  19. GRB 070529: Swift-XRT refined analysis
  20. GRB 070529, Swift-BAT refined analysis
  21. GRB 070529: Xinglong TNT Optical Upper Limit
  22. GRB 070529: Swift detection of a burst with an optical aterglow
  23. GRB 070412: Deep Keck imaging
  24. Swift trigger 280447 is probably a Galactic transient
  25. GRB 070518, deep LBT photometry
  26. Konus-Wind observation of GRB 070521
  27. GRB070521: Second Epoch Gemini Imaging
  28. GRB 070521: Swift/UVOT Upper Limits
  29. GRB 070521, optical observation
  30. GRB 070521: Swift-XRT refined analysis
  31. GRB 070521: Keck imaging
  32. GRB070521: Gemini Observations
  33. GROND upper limits of GRB 070521
  34. GRB 070520B: SARA upper limit
  35. GRB 070520A: SARA upper limit
  36. GRB 070521: SARA upper limit
  37. GRB 070521: Subaru observations and possible host detection
  38. GRB 070520B: Swift/UVOT Upper Limits
  39. GRB 070520A: Subaru Observations
  40. GRB 070521, Swift-BAT refined analysis
  41. GRB 070520A: Swift UVOT Upper Limits
  42. GRB 070520B: Swift-XRT refined analysis
  43. GRB 070521: TAROT La Silla observatory optical observations
  44. GRB070521 - SDSS Pre-Burst Observations
  45. GRB 070521: Swift detection of a burst
  46. GRB 070520A: MITSuME Akeno optical upper limits
  47. GRB 070520B, Swift-BAT refined analysis
  48. GRB 070520A, Swift-BAT refined analysis
  49. GRB 070520A: Swift-XRT refined analysis
  50. GRB 070518: TNG observations
  51. GRB 070520B: Swift detection of a burst
  52. GRB 070520: Xinglong EST optical Upper Limit
  53. GRB 070520: Swift detection of a burst
  54. VLA observation of GRB 070518
  55. GRB 070518: Swift-XRT refined analysis
  56. GRB070518: UVOT refined analysis
  57. GRB 070518, Swift-BAT refined analysis
  58. GRB 070518: OT confirmed form Xinglong TNT observation
  59. GRB 070518: Swift detection of a burst with optical afterglow
  60. GRB070517: Swift-XRT Refined Analysis
  61. GRB 070517, Swift-BAT refined analysis
  62. GRB 070517: Optical search
  63. GRB 070517: Swift detection of a burst
  64. GRB 070509: objects inside XRT error circle
  65. GRB 070512: IPN localization and Konus spectrum of a bright burst
  66. GRB070419A: optical observations
  67. GRB 070509: Swift/UVOT Upper Limits
  68. Konus-Wind and Konus-A observation of GRB 070508
  69. GRB 070510: Swift detection of a possible burst
  70. GRB070509: Swift-XRT Refined Analysis
  71. GRB 070509, Swift-BAT refined analysis
  72. GRB 070508: Suzaku/WAM observation of the prompt emission
  73. GRB 070509: REM observations
  74. GRB070508: Swift/UVOT Observations
  75. GRB 070508, Swift-BAT refined analysis
  76. GRB 070508: REM observations
  77. GRB 070508: TAROT La Silla observatory optical observations
  78. GRB 070508: Swift detection of an intense burst with an optical counterpart
  79. GRB070506: Swift/UVOT Observations
  80. GRB070506: Swift XRT refined analysis
  81. GRB 070506, Swift-BAT Refined Analysis
  82. GRB 070506: Swift detection of a burst with optical afterglow
  83. GRB070429B: VLT observations
  84. GRB070429B: position correction
  85. GRB 070309: Swift-XRT afterglow confirmation
  86. VLA observation of GRB 070429B
  87. Swift/UVOT observations of GRB070429B
  88. GRB 070429B, Swift-BAT refined analysis
  89. Swift/UVOT observations of GRB070429A
  90. GRB 070429A, Swift-BAT refined analysis
  91. GRB 070429A: optical and NIR observations
  92. GRB 070429B: Swift XRT refined analysis
  93. GRB 070429B: ROTSE-III Optical Limits
  94. GRB 070429: ROTSE-III Optical Limits
  95. GRB 070429: Swift detection of a burst
  96. GRB 070427, Swift-BAT Refined Analysis
  97. LT monitoring of GRB070412
  98. GRB 070411: Late-time Keck imaging
  99. GRB070419B: Suzaku WAM observation of the prompt emission
  100. GRB 070420, SMARTS optical/IR afterglow observations

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