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"

12344 results found.

  1. GRB 100526A: NOT optical upper limit
  2. GRB 100526A: MASTER-Net optical alert observations
  3. GRB 100526A: Swift detection of a burst
  4. GRB 100522A: GROND observations, upper limits
  5. Swift/UVOT observations of GRB100522A.
  6. GRB 100522A: Swift detection of a burst
  7. GRB 100518A: GROND afterglow observation and photo-z
  8. GRB 100518A: Swift/UVOT Upper Limits
  9. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  10. GRB 100513A: MITSuME Akeno Optical Observation
  11. GRB 100514A: Swift/UVOT Observations
  12. GRB 100514A: Swift detection of a burst
  13. GRB 100513A: Swift/UVOT upper limits
  14. GRB 100513A, RIMOTS optical upper limits
  15. GRB 100513A: SARA-N Upper Limit
  16. Swift-BAT trigger 421695 is likely not astrophysical
  17. GRB100504A: Optical upper limits at IAO
  18. GRB 100511A, RIMOTS optical upper limits
  19. GRB100508A: Further Swift/UVOT Observations
  20. GRB 100508A: GROND Detection of the optical afterglow
  21. GRB 100508A: Swift detection of a burst
  22. GRB 100504A: Swift/UVOT Observations
  23. GRB 100504A: GROND Upper limits
  24. GRB 100504A: SARA-South Upper Limit
  25. GRB 100504A: Swift detection of a burst
  26. INTEGRAL observations of Swift GRB trigger 421072
  27. Trigger 421072: Possible Swift detection of a GRB or transient
  28. GRB 100423A: xinglong TNT optical upper limit
  29. GRB 100420A: Terskol optical upper limit
  30. GRB 100427A: Swift XRT and UVOT Upper Limits
  31. GRB 100423A: CrAO optical observations
  32. GRB 100424A: CrAO optical observations
  33. GRB100425A: Swift/UVOT Upper Limits
  34. GRB 100424A: Swift/UVOT Upper Limits
  35. GRB 100424A: Liverpool Telescope Upper Limits
  36. GRB100424A: MITSuME optical upper limits
  37. GRB100423A: MITSuME optical upper limits
  38. GRB 100424A : Lulin early z'-band upper limit
  39. GRB 100424A: GROND Upper Limits
  40. GRB 100424A: PAIRITEL NIR Upper Limits
  41. GRB 100425A: Swift detection of a burst
  42. GRB 100424A: Swift detection of a burst
  43. GRB 100420A: GRT Optical Observation
  44. Trigger 420256: Swift detection of a possible GRB
  45. GRB100418A: REM possible afterglow detection
  46. GRB100420A: MITSuME optical upper limits
  47. GRB 100420A: Swift/UVOT Upper Limits
  48. GRB 100420A: SARA Upper Limits
  49. GRB 100414A: Confirmation of the X-ray afterglow
  50. GRB 100418A: Swift/UVOT Observations
  51. GRB 100413A: GMRT observation of radio afterglow
  52. GRB 100413B: Swift Confirmation of Burst
  53. GRB 100415A: MAXI/GSC detection of a probable GRB
  54. GRB 100413A: GROND Upper limits
  55. GRB 100413A: Swift/UVOT Upper Limits
  56. GRB 100413A: SARA upper limit
  57. GRB 100413: xinglong TNT optical upper limit
  58. GRB 100413A: Swift detection of a burst
  59. GRB100401A: GROND Upper Limits
  60. GRB 100331B: GROND Upper limits
  61. GRB 100401A: Swift/UVOT Upper Limit
  62. GRB 100331B: Swift/UVOT Upper Limits
  63. Short X-ray Transient detected by MAXI/GSC
  64. GRB 100324A: GROND observations
  65. SGR 1833-0832: Swift/UVOT Upper Limits
  66. SGR 1833-0832: Archival Chandra Observations
  67. GRB 100316D: ATCA radio observations
  68. GRB 100319A: Swift detection of a burst; possible SGR
  69. GRB 100219A: optical upper limit
  70. GRB 100316A: optical observations in CrAO
  71. GRB100316C: Swift/UVOT Upper Limits
  72. GRB 100316B: Swift/UVOT observations
  73. GRB100316A: Swift/UVOT Upper Limits
  74. Trigger 416140 is almost certainly not a GRB
  75. GRB 100316B: VLT/X-shooter redshift
  76. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  77. GRB 100316C: Swift detection of a burst
  78. GRB 100316A: Swift/UVOT Observations
  79. GRB100305A: Optical upper limits at IAO
  80. GRB 100305A: Gemini z'-band observation
  81. GRB 100305A: Swift/UVOT Upper Limits
  82. GRB 100305A: PAIRITEL NIR Upper Limits
  83. GRB 100305A: Swift detection of a burst
  84. GRB 100302A: Swift/UVOT Upper Limits
  85. GRB 100302A: Swift detection of a burst
  86. GRB 100206A: optical observations in CrAO
  87. GRB 100206A: optical observations in Terskol
  88. GRB 100213B: Mondy optical observations
  89. GRB
  90. GRB 100216A: Swift/UVOT Observations
  91. GRB100219A Akeno and Okayama MITSuME Optical Observation
  92. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  93. GRB 100216A: XRT Refined Analysis
  94. GRB 100219A: Swift detection of a burst
  95. GRB 100213B: GRT Optical Observation
  96. GRB 100213A: GRT Optical Observation
  97. GRB 100213B: Swift/UVOT Upper Limits
  98. GRB 100213A: Swift/UVOT Upper Limits
  99. GRB 100213B: PAIRITEL NIR Upper Limits
  100. GRB 100213B: 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