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"

12399 results found.

  1. GRB 150817A: Continued RATIR Observations, Revised Candidate
  2. GRB 150817A: RATIR Optical Afterglow Candidate
  3. GRB 150811A: Continued RATIR Observations
  4. GRB 150811A: Continued RATIR Observations
  5. Konus-Wind observation of GRB 150811B
  6. Swift Trigger 652046 is probably not a GRB
  7. GRB 150811A: Continued RATIR Observations
  8. GRB 150811A: Swift/UVOT further observations
  9. GRB 150811A: Swift detection of a burst
  10. GRB 150801A: Swift-XRT observations
  11. GRB 150801B: Swift/UVOT Upper Limits
  12. GRB 150801B: Swift detection of a burst
  13. GRB 150801A: MAXI/GSC detection
  14. GRB150724B: Retraction of the uvot detection
  15. GRB 150727A: Continued RATIR Optical Observations - Fading
  16. GRB 150728A: Swift/UVOT Upper Limits
  17. GRB 150727A: RATIR Optical Observations
  18. GRB 150727A: Watcher optical upper limit
  19. GRB 150727A: Swift/UVOT Detection
  20. GRB 150724B: MASTER upper limit
  21. GRB 150724B: Swift/UVOT Detection
  22. Konus-Wind observation of GRB 150724B
  23. GRB 150724B: Swift-XRT observations
  24. GRB 150725A: MAXI/GSC detection
  25. Swift IGR J00291+5934: MASTER Optical flare detection
  26. GRB 150724A: Swift/UVOT Upper Limits
  27. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  28. GRB 150724A: Swift detection of a burst
  29. GRB 150722A: Swift/UVOT Upper Limits
  30. GRB 150720A: Swift/UVOT Upper Limits
  31. Swift Trigger 649706: a possible GRB or bright Galactic transient
  32. GRB 150716A: KAIT Optical Upper Limit
  33. GRB 150716A: Swift/UVOT Upper Limits
  34. GRB 150716A: Swift detection of a burst
  35. Trigger 649113: Swift detection of SGR 1E 1841-045
  36. GRB 150710B: Swift-XRT and Swift-UVOT observations
  37. GRB 150711A: Swift/UVOT Upper Limits
  38. GRB 150711A: Swift detection of a burst
  39. GRB 150710A: Swift/UVOT Upper Limits
  40. GRB 150710A: RATIR Observations
  41. GRB 150626B: AMI 16 GHz detection of the radio counterpart
  42. GRB 150702A: MASTER-SAAO inspection
  43. GRB 150702A: Swift-XRT observations
  44. Swift Trigger 647642 is probably not an astrophysical source
  45. GRB 150627A: MASTER-SAAO OT Detection
  46. GRB 150626B: Swift/UVOT Upper Limits
  47. GRB 150626B: NOT optical upper limits
  48. GRB 150626B: MASTER observations
  49. GRB 150626B: Swift detection of a burst
  50. GRB 150626A: Swift/UVOT Upper Limits
  51. GRB 150626A: Swift detection of a burst
  52. V404 Cyg: MASTER Swift, Integral alert observations
  53. GRB 150622A: Swift-XRT observations
  54. GRB 150616A: Watcher optical upper limit
  55. GRB 150616A: Swift/UVOT Upper Limits
  56. GRB 150616A: Swift detection of a burst
  57. Swift trigger 643949 is V404 Cyg
  58. GRB 150615A: Swift/UVOT Detection
  59. GRB 150615A: Swift detection of a burst
  60. GRB 150608A: MITSuME Akeno optical upper limits
  61. Trigger 643078: Swift detection of H1743-322
  62. Konus-Wind observation of GRB 150607A
  63. GRB 150607A: Swift/UVOT Detection
  64. Swift trigger 642453 is not an astrophysical source
  65. Swift Trigger 642453: a possible GRB
  66. Konus-Wind observation of GRB 150530A
  67. GRB 150530B: Swift-XRT observations
  68. GRB 150530A: RATIR Optical Observations
  69. GRB 150530A: Swift/UVOT Upper Limits
  70. GRB 150530A: Swift detection of a burst
  71. GRB 150513A: Swift-XRT observations
  72. GRB 150527A: MITSuME Okayama upper limits
  73. GRB 150527A: Swift/UVOT Upper Limits
  74. GRB 150527A: RATIR Afterglow Detection
  75. GRB 150527A: Swift detection of a burst
  76. GRB 150513A: request for X-ray follow up
  77. Swift trigger 641332 is probably not an astrophysical source
  78. GRB 150518A: Continued RATIR optical observations
  79. GRB 150518A: MAXI-GSC further analysis
  80. GRB 150518A: AMI 15 GHz detection of possible radio counterpart
  81. GRB 150518A : Xinglong TNT upper limit
  82. GRB 150518A: RATIR optical observations
  83. Swift/UVOT observations of GRB150518A
  84. Konus-Wind observation of GRB 150514A
  85. Konus-Wind observation of GRB 150510A
  86. GRB 150423A: Chandra X-ray Observation
  87. Confirmation that Swift Trigger 639636 is not astrophysical
  88. Swift Trigger 639636: a possible GRB
  89. GRB 150413A: AMI 15 GHz confirmation of radio counterpart
  90. GRB 150430A: GROND Upper Limits
  91. GRB 150430A: MAXI/GSC detection
  92. GRB 150430A: Swift/UVOT Upper Limits
  93. GRB 150428B: IRSF NIR upper limits
  94. GRB 150428B: Swift/UVOT Upper Limits
  95. GRB 150428C: Swift-XRT observations
  96. GRB 150428A: Swift/UVOT Upper Limits
  97. GRB 150428B: MASTER-net prompt optical observation
  98. GRB 150428A: MASTER-net early optical observation
  99. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  100. GRB 150428A: RATIR optical 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