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"

21770 results found.

  1. GRB 100816A: Enhanced Swift-XRT position
  2. GRB 100816A: Gemini-N imaging
  3. GRB 100816A: TAROT Calern observatory optical detection
  4. GRB 100816A: MASTER Optical Limits
  5. GRB100816A: TNG optical afterglow confirmation.
  6. GRB 100816A: ROTSE-III Optical Limits
  7. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  8. GRB 100814A: Submm observations from APEX
  9. Swift/UVOT observations of GRB100814A
  10. GRB 100814A, Swift-BAT refined analysis
  11. GRB 100814A: CQUEAN r- and i-band Observation
  12. GRB 100814A: Enhanced Swift-XRT position
  13. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  14. GRB 100814A: Swift detection of a burst with an optical afterglow
  15. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  16. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  17. GRB 100802A: further NOT observation
  18. GRB 100807A: P200 Infrared Observations
  19. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  20. GRB100807A: optical observation in CrAO
  21. GRB 100805A: optical observation in CrAO
  22. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  23. GRB100807A: MITSuME optical upper limits
  24. GRB 100807A: P60 Optical Afterglow Discovery
  25. GRB 100807A: Swift/UVOT Upper Limits
  26. GRB 100805A: SAO RAS optical observations
  27. GRB 100807A: Enhanced Swift-XRT position
  28. GRB 100807A: ROTSE-III Optical Limits
  29. GRB 100807A: Swift detection of a burst
  30. GRB 100805A: IAC80 and 1.5m OSN optical observations
  31. GRB 100805A: Early RAPTOR Observations
  32. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  33. GRB 100802A: WIYN observations
  34. GRB 100805A: IAC80 BVR-band observations
  35. GRB 100805A: GRAS 002 optical observations
  36. Trigger 430975: Swift detection of a possible burst
  37. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  38. GRB 100805A: Enhanced Swift-XRT position
  39. GRB 100805A: Further P60 Monitoring
  40. GRB 100805A: P60 Optical Afterglow Candidate
  41. GRB 100805A: ROTSE-III Optical Limits
  42. GRB 100805A: Swift detection of a burst with an optical counterpart
  43. GRB 100728B: optical photometry of ISON-NM
  44. GRB 100713A: second epoch Maidanak optical observation
  45. GRB 100713A: CrAO optical limits
  46. GRB 100802A: NOT optical observation
  47. GRB100802A: MITSuME optical upper limits
  48. GRB 100802A: P60 Observations
  49. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  50. GRB 100728A: Suzaku WAM observation of the prompt emission
  51. GRB 100802A: Enhanced Swift-XRT position
  52. GRB 100802A: ROTSE-III Optical Limits
  53. GRB 100802A: Swift detection of a burst
  54. GRB 100728B - NOT optical observation
  55. GRB 100728B: Swift/UVOT Observations
  56. GRB 100728B: Continued KAIT observations
  57. GRB 100728B, Swift-BAT refined analysis
  58. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  59. GRB 100727A: Swift/UVOT Upper Limits
  60. GRB 100728A, Swift-BAT refined analysis
  61. GRB 100728B: Enhanced Swift-XRT position
  62. GRB 100728A: Swift/UVOT Upper Limits
  63. GRB 100728B: GROND Detection of the NIR Afterglow
  64. GRB 100728B: optical detection
  65. GRB 100728B: Swift detection of a burst with an optical counterpart
  66. GRB 100728A: Enhanced Swift-XRT position
  67. GRB 100728A: Swift detection of a burst
  68. GRB 100727A: Enhanced Swift-XRT position
  69. GRB 100727A: Swift detection of a burst
  70. GRB100725B: MITSuME optical upper limits
  71. GRB 100724B: Suzaku WAM observation of the prompt emission
  72. GRB 100725A: GROND upper limits
  73. GRB 100725B: Swift/UVOT Upper Limits
  74. GRB 100725A: Swift/UVOT Upper Limits
  75. GRB 100725B: Enhanced Swift-XRT position
  76. GRB 100725A: Enhanced Swift-XRT position
  77. GRB 100725B: Swift detection of a burst
  78. GRB100725A Faulkes Telescope South observations
  79. Konus-Wind observation of GRB 100724B
  80. GRB 100725A: Swift detection of a burst
  81. GRB 100724B: Fermi GBM detection
  82. GRB 100724A: Enhanced Swift-XRT position
  83. GRB 100724A: Swift/UVOT observations
  84. GRB 100724A: Swift detection of a burst
  85. GRB 100614A: 10.4-m GTC deep-optical limit
  86. GRB 100722A: Fermi GBM detection
  87. GRB 100718A: MASTER-Net optical prompt and alert observations
  88. GRB 100719A: Swift-BAT refined analysis
  89. GRB 100713A: optical observation in Maidanak
  90. GRB 100713A: Swift XRT refined analysis
  91. GRB 100713A: GROND upper limits
  92. GRB 100713A: TNG optical observations
  93. GRB100713A: Swift X-ray afterglow detection
  94. GRB 100707A: Suzaku WAM observation of the prompt emission
  95. Konus-Wind observation of GRB 100707A
  96. GRB 100707A: Fermi LAT detection
  97. GRB 100628A: Chandra observations
  98. GRB 100628A: Swift XRT/UVOT refined analysis
  99. Konus-Wind observation of GRB 100701B
  100. GRB 100704: Swift/UVOT Upper Limits

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