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"

21263 results found.

  1. GRB 060204C: ROTSE-III Optical Limits
  2. GRB 060204C: Swift-BAT detection of a burst
  3. GRB060204B, optical observation
  4. GRB060204B - SDSS pre-burst observations
  5. GRB 060204B: Swift detection of a burst
  6. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  7. GRB 060203: RTT150 optical observations
  8. Swift-BAT trigger is GRB 060203
  9. GRB 060203: IR Counterpart
  10. GRB060203: Observations with SARA
  11. GRB 060203: P60 Confirmation of Optical Afterglow
  12. Possible GRB 060203: optical observations at Asiago
  13. GRB 060202: Gemini-N J, H, K_s observations
  14. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  15. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  16. GRB060202, optical observation
  17. GRB 060202: Swift/UVOT upper limits
  18. GRB 060202: Swift detection of a burst
  19. GRB 060121: Gemini Late-time Observations
  20. GRB 060130: PROMPT Observations
  21. GRB060130: Further R-band imaging
  22. GRB 060130: Swift/XRT observation
  23. GRB060130: Optical imaging
  24. GRB060130: REM infrared observations
  25. GRB 060130, SMARTS optical observations
  26. GRB 060130: FRAM optical observations
  27. GRB 060121: Confirmation of NIR Afterglow
  28. GRB 060123: Swift refined analysis of an unusual GRB
  29. GRB060124, BVRcIc field calibration
  30. GRB060105: refined analysis of the Suzaku observation
  31. GRB 060121: Probable Detection of NIR Afterglow
  32. GRB 060116 HST observations
  33. Konus-Wind observation of GRB 060124
  34. GRB 060124: ART optical limits during the burst
  35. GRB060123: Optical and IR Imaging
  36. GRB 060123: P200 Observations
  37. GRB 060124: R band Observations
  38. GRB 060124 : Optical observation at Xinglong and Kiso
  39. GRB060123: SDSS pre-burst observations
  40. GRB 060123: Swift detection of a very long, faint burst
  41. GRB 060121: OHP optical limits
  42. GRB 060124: TAROT optical limits
  43. GRB060124, optical observation
  44. GRB 060124: Optical Observations at Tautenburg
  45. GRB 060117: Suzaku WAM observation of the prompt emission
  46. GRB 060111B: Suzaku WAM observation of the prompt emission
  47. GRB 060124: Swift-BAT detection of a burst
  48. GRB 060121: Swift/UVOT upper limits
  49. GRB 060121: Liverpool Telescopes optical limits
  50. GRB 060121: Swift XRT refined analysis
  51. Konus-Wind observation of GRB 060121
  52. GRB 060121: I-band Limits
  53. GRB 060121: candidate optical counterpart
  54. GRB 060121: Swift XRT refined position
  55. GRB 060121: Infrared Observations
  56. GRB 060121: optical observations
  57. GRB 060121: Optical imaging
  58. GRB060121 - SDSS pre-burst observations
  59. GRB 060121: A short-hard GRB in a cluster?
  60. HETE Alert 4006: MASTER promt optical limit
  61. GRB 060117: PROMPT Observations
  62. GRB060117 - ATCA 3/6cm radio limits - correction
  63. GRB060117 - ATCA 3/6cm radio limits
  64. Konus-Wind observation of GRB 060117
  65. GRB 060116: UKIRT IR Observations
  66. GRB 060117: Refined analysis of the Swift-BAT burst
  67. GRB 060116: PROMPT Observations
  68. GRB 060117: FRAM optical afterglow candidate
  69. GRB 060117: nearby galaxy
  70. GRB 060116: VLT optical observations
  71. GRB 060115: PROMPT Observations
  72. GRB 060116: IR Candidate Afterglow
  73. GRB 060116: Swift/UVOT upper limits
  74. GRB060115: REM observations
  75. GRB 060116: ROTSE-III Optical Limits
  76. GRB060116: Faulkes North observation
  77. GRB 060116: Swift-BAT detection of a burst
  78. GRB 060115: Refined analysis of the Swift-BAT burst
  79. GRB 060115: Swift/UVOT upper limits
  80. GRB 060114: REM observations
  81. GRB 060114: Swift/UVOT Observations
  82. GRB060115, optical observation
  83. GRB 060115: MITSuME optical afterglow candidate
  84. GRB 060115: Swift detection of a burst
  85. GRB060114, optical observation
  86. GRB060114: Faulkes North observation
  87. GRB 060108: IR observations of afterglow
  88. GRB 060108: Evidence for an XRT Position Offset
  89. GRB 060110: KAIT observations
  90. GRB 060111B: MITSuME detection of optical afterglow
  91. GRB 060111B: TAROT optical observation
  92. GRB060111A: RTT150 optical observations
  93. GRB060111B: RTT150, possible host galaxy
  94. GRB 060110: MARGE observations
  95. GRB 060111(a): P60 Observations
  96. GRB 060111B: Gualba observatory limit
  97. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  98. GRB 060111B: Swift detection of a burst
  99. GRB 060108: VLT K-band observations
  100. GRB 060111: TAROT optical observation

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