Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

16155 results found.

  1. GRB 100807A: P60 Optical Afterglow Discovery
  2. GRB 100807A: Swift/UVOT Upper Limits
  3. GRB 100805A: SAO RAS optical observations
  4. GRB 100807A: ROTSE-III Optical Limits
  5. GRB 100805A: IAC80 and 1.5m OSN optical observations
  6. GRB 100805A: Xinglong TNT optical observation
  7. GRB 100805A: ROTSE-III Optical detection
  8. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  9. GRB 100805A: IAC80 BVR-band observations
  10. GRB 100805A: GRAS 002 optical observations
  11. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  12. GRB 100805A: Liverpool Telescope afterglow observations
  13. GRB 100805A: Further P60 Monitoring
  14. GRB 100805A: P60 Optical Afterglow Candidate
  15. GRB 100805A: ROTSE-III Optical Limits
  16. GRB 100805A: Swift detection of a burst with an optical counterpart
  17. GRB 100728B: optical photometry of ISON-NM
  18. GRB 100713A: second epoch Maidanak optical observation
  19. GRB 100713A: CrAO optical limits
  20. GRB 100802A: NOT optical observation
  21. GRB100802A: MITSuME optical upper limits
  22. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  23. GRB 100802A: ROTSE-III Optical Limits
  24. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  25. GRB 100725B: TELMA optical observation
  26. GRB 100728B - NOT optical observation
  27. GRB 100728B: Swift/UVOT Observations
  28. GRB 100728B: Continued KAIT observations
  29. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  30. GRB 100728A, Swift-BAT refined analysis
  31. GRB 100728B: optical detection
  32. GRB 100728B: Skynet/PROMPT Detections (correction)
  33. GRB 100728B: KAIT optical afterglow detection (correction)
  34. GRB 100728B: Swift detection of a burst with an optical counterpart
  35. GRB 100728A: KAIT optical afterglow detection
  36. GRB 100727A, Swift-BAT refined analysis
  37. GRB100727A: MOA optical upper limit
  38. GRB100725B: MITSuME optical upper limits
  39. GRB 100725A: GROND upper limits
  40. GRB 100725B: Swift/UVOT Upper Limits
  41. GRB 100725A: Swift/UVOT Upper Limits
  42. GRB 100724A: X-shooter redshift
  43. GRB 100614A: 10.4-m GTC deep-optical limit
  44. GRB 100718A: MASTER-Net optical prompt and alert observations
  45. GRB 100713A: optical observation in Maidanak
  46. GRB100713A: Swift/UVOT observations
  47. GRB 100713A: optical upper limit
  48. GRB 100713A: TNG optical observations
  49. GRB 100713A: TELMA and 1.5m OSN optical observations
  50. GRB 100704: Swift/UVOT Upper Limits
  51. GRB100704A: MOA optical upper limit
  52. Swift/UVOT observations of GRB100702A
  53. GRB 100702A: VLT optical observations
  54. GRB 100702: ROTSE-III Optical Limits
  55. GRB 100213B: Detection of Fading Optical Afterglow
  56. GRB 100628A: GROND optical/NIR observations of the host candidate
  57. GRB100628A : MOA optical upper limit
  58. GRB 090709A: Host galaxy detection
  59. GRB 100628A: Swift/UVOT Upper Limits
  60. GRB100628A: RTT150 optical observations
  61. GRB 100625A: Magellan near-IR Observations
  62. GRB 100614A: CrAO optical limit
  63. GRB 100625A: Swift/UVOT Upper Limits
  64. GRB100625A : MOA optical upper limit
  65. GRB 100418A: late time optical observations
  66. GRB 100621A MOA-II optical limit
  67. GRB 100621A: VLT/X-shooter redshift
  68. GRB 100621A: GROND observation of bright NIR afterglow
  69. GRB 100621A: ROTSE-III Optical Limits
  70. GRB 100606A: Optical Limits
  71. GRB 100619A: Swift/UVOT Upper Limits
  72. GRB 100614A: Gemini/NIRI Observations
  73. GRB 100614A: NOT optical upper limits
  74. GRB 100614A: MASTER-Net optical alert observations
  75. GRB 100615A: PAIRITEL NIR Upper Limits
  76. GRB 100614A: BOOTES-2/TELMA optical observations
  77. GRB 100614A: Liverpool Telescope Observations
  78. GRB 100606A: GROND observations
  79. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  80. Radio detection of GRB100418a with ATCA
  81. Swift detection of outburst from the SFXT IGR J18410-0535
  82. GRB 100111A: Maidanak optical observations
  83. GRB 100418A: Maidanak optical observations
  84. GRB 100513A: CrAO optical observations
  85. GRB 100514A: CrAO optical observations
  86. GRB 100526A: optical upper limit
  87. GRB 100528A: Faulkes Telescope North Detection
  88. GRB 100528A: NOT optical observation
  89. GRB 100526B: Swift/UVOT Upper Limits
  90. GRB 100526A: Swift/UVOT Upper Limits
  91. GRB 100526A: NOT optical upper limit
  92. GRB 100526A: MASTER-Net optical alert observations
  93. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  94. GRB 100522A: GROND observations, upper limits
  95. Swift/UVOT observations of GRB100522A.
  96. GRB 100522A: BOOTES-2 optical limit
  97. GRB 100418A: CrAO optical observations
  98. GRB 100518A: GROND afterglow observation and photo-z
  99. GRB 100518A: Swift/UVOT Upper Limits
  100. GRB 100518A: optical afterglow decay

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