Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

5544 results found.

  1. GRB 070208: MARGE Optical Observations
  2. GRB 070208: RAPTOR detection of early afterglow onset
  3. GRB 070208: MDM Optical Decay
  4. GRB 070208: Early IR detection and afterglow astrometry
  5. GRB 070208: Afterglow confirmation from P60
  6. GRB 070208: ROTSE-III Optical Limits
  7. GRB 070208: MDM Observations
  8. GRB 070208: Swift detection of a burst
  9. GRB 070125: optical observation
  10. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  11. GRB 070129: Swift detection of a burst
  12. GRB 070125: further AAVSO optical observations
  13. GRB 070125: AAVSO optical observations
  14. GRB 070125: Continued P60 Observations
  15. GRB070125: Swift-XRT Refined Analysis
  16. GRB 070125: P60 Optical Afterglow Candidate
  17. GRB 070110: Swift detection of a burst with a possible optical afterglow
  18. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  19. Retractions of previous Swift-BAT triggers
  20. GRB 061210: Swift/XRT Astrometry Correction
  21. GRB 061222A: MITSuME Akeno optical upper limits
  22. GRB 061222B: Swift detection of a burst
  23. GRB 061201: Correction to GCN 5944
  24. GRB 061201: Magellan Redshift of nearby Abell cluster
  25. GRB 061210: MDM Follow-up Observation
  26. GRB061210: Swift/UVOT observations
  27. GRB 060926: MASTER: discovery of the optical flare
  28. GRB 061202: Swift XRT refined analysis
  29. GRB 061202: Swift detection of a burst
  30. GRB 061122: GETS observation
  31. GRB 061126: optical observation
  32. GRB 061126: Swift/UVOT Observations
  33. GRB061121: optical observations
  34. GRB 061121: Swift/UVOT Observations
  35. GRB 061121: Swift-XRT Team Refined Analysis
  36. GRB061121, optical observation
  37. GRB 061121: Faulkes Telescope North Optical Observation
  38. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  39. GRB 061121: Swift detection of a bright burst with an optical counterpart
  40. GRB061110B: Optical observations at Crni Vrh
  41. GRB 061110A: Swift XRT refined analysis
  42. GRB 061110: Swift detection of a burst
  43. GRB 061109: Swift detection of a possible burst
  44. GRB 061102, XRT refined analysis
  45. GRB 061028: Swift detection of a burst
  46. GRB 061021: Swift/UVOT Observation
  47. GRB 061021: Swift detection of a burst
  48. GRB 060930: MARGE Optical Limits
  49. GRB 061007: Correction to GCN 5712
  50. GRB 061007: Swift detection of a burst with an optical counterpart
  51. GRB 060930: ROTSE-III Optical Limits
  52. GRB 060930: A long X-ray rich GRB detected by INTEGRAL
  53. GRB060929: Swift-XRT refined analysis.
  54. GRB 060927: Swift/UVOT Optical Observations
  55. GRB 060927: Xinglong TNT optical observations
  56. GRB 060926: MASTER: first minutes decay
  57. GRB 060926: MASTER OT alert observation
  58. GRB 060926: MASTER optical observation
  59. GRB060919: Swift/UVOT optical observations
  60. GRB 060919: TAROT optical observations
  61. GRB 060908: REM optical prompt observation
  62. GRB 060904b: SMARTS optical/IR afterglow observations
  63. GRB 060904B: RTT150 optical observations
  64. GRB060904A: Swift/UVOT optical observations
  65. GRB 060904B: Optical observations at Crni Vrh
  66. GRB 060904B: TAROT optical counterpart observations
  67. GRB 060904: TAROT optical observations
  68. 060901: Swift UVOT followup observations
  69. GRB 060901: SMARTS optical/IR observations
  70. Swift-BAT trigger 226614 is not a GRB
  71. GRB 060826(?): Swift detection of a possible burst
  72. GRB 060729, SMARTS optical/IR observations
  73. GRB 060814: Possible IR counterpart
  74. Swift detection of an outburst from the 4U 1246-58 LMXB burster
  75. GRB 060729: An update on the Swift XRT and UVOT observations
  76. GRB 060805B: XRT Team Analysis
  77. GRB 060805B: X-ray Afterglow Detection, Spectral/Spatial/Temporal Properties
  78. IPN triangulation of GRB060805B
  79. GRB 060729 redshift
  80. GRB 060719: Swift detection of a burst
  81. GRB 060717: Swift detection of a burst
  82. GRB060714: optical observations
  83. GRB 060605: SkyNet Optical Limits
  84. GRB 060708: Swift detection of a burst with an UVOT countpart
  85. GRB 060614: SMARTS host galaxy observations
  86. GRB 060602A: Swift/XRT analysis
  87. GRB 060607B: Swift detection of a burst
  88. GRB 060607: Swift detection of a burst with bright optical counterpart
  89. GRB 060522: PROMPT Optical Limits
  90. GRB 060604: Swift detection of a burst with possible optical counterpart
  91. GRB060602A: optical observations(/transient?)
  92. GRB060602 - SDSS Pre-Burst Observations
  93. GRB060526: Optical counterpart from MIRO
  94. GRB 060526: Optical Flare
  95. GRB 060526: MDM-2.4m Observations
  96. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  97. GRB060510A: XRT refined analysis
  98. GRB060510 - SDSS Pre-Burst Observations
  99. GRB 060510B: Swift detection of a burst
  100. GRB 060510: Swift detection of a burst with optical transient

Advanced

Download all Circulars as a .tar.gz archive:
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