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"

20360 results found.

  1. GRB060130: Optical imaging
  2. GRB060130: REM infrared observations
  3. GRB 060130, SMARTS optical observations
  4. GRB 060130: FRAM optical observations
  5. GRB 060121: Confirmation of NIR Afterglow
  6. GRB060124, BVRcIc field calibration
  7. GRB 060121: Probable Detection of NIR Afterglow
  8. GRB 060116 HST observations
  9. Refined XRT Position for GRB 060123
  10. GRB 060124: ART optical limits during the burst
  11. GRB060123: Optical and IR Imaging
  12. GRB 060123: P200 Observations
  13. GRB 060124: R band Observations
  14. GRB 060124 : Optical observation at Xinglong and Kiso
  15. GRB060123: SDSS pre-burst observations
  16. GRB 060121: OHP optical limits
  17. GRB 060124: TAROT optical limits
  18. GRB060124, optical observation
  19. GRB 060124: Optical Observations at Tautenburg
  20. GRB 060124: Swift-BAT detection of a burst
  21. GRB 060121: Liverpool Telescopes optical limits
  22. GRB 060121: candidate optical counterpart
  23. GRB 060121: Infrared Observations
  24. GRB 060121: optical observations
  25. GRB 060121: Optical imaging
  26. GRB060121 - SDSS pre-burst observations
  27. HETE Alert 4006: MASTER promt optical limit
  28. GRB060117 - ATCA 3/6cm radio limits - correction
  29. GRB060117 - ATCA 3/6cm radio limits
  30. GRB 060116: UKIRT IR Observations
  31. GRB 060117: FRAM optical afterglow candidate
  32. GRB 060117: nearby galaxy
  33. GRB 060116: VLT optical observations
  34. GRB 060116: IR Candidate Afterglow
  35. GRB 060116: Swift/UVOT upper limits
  36. GRB060115: REM observations
  37. GRB060116: Faulkes North observation
  38. GRB 060116: Swift-BAT detection of a burst
  39. GRB 060115: Swift/UVOT upper limits
  40. GRB 060114: REM observations
  41. GRB 060114: Swift/UVOT Observations
  42. GRB060115, optical observation
  43. GRB 060115: MITSuME optical afterglow candidate
  44. GRB 060115: Swift detection of a burst
  45. GRB060114, optical observation
  46. GRB060114: Faulkes North observation
  47. GRB 060108: IR observations of afterglow
  48. GRB 060108: Evidence for an XRT Position Offset
  49. GRB 060110: KAIT observations
  50. GRB 060111B: MITSuME detection of optical afterglow
  51. GRB 060111B: TAROT optical observation
  52. GRB060111A: RTT150 optical observations
  53. GRB060111B: RTT150, possible host galaxy
  54. GRB 060111B: Refined analysis of the Swift-BAT burst
  55. GRB 060111(a): P60 Observations
  56. GRB 060111B: Gualba observatory limit
  57. GRB 060111B: Swift detection of a burst
  58. GRB 060108: VLT K-band observations
  59. GRB 060111: TAROT optical observation
  60. GRB 060111: Swift detection of a burst
  61. GRB 060110: Mitsume optical observations
  62. GRB 060108: z-band imaging from Gemini-North
  63. GRB 060110a: RAPTOR detection of early optical emission.
  64. GRB 060110: UKIRT K-band observations
  65. GRB 060110: IR Candidate Afterglow
  66. GRB060110, optical observation
  67. GRB 060110: Correction
  68. GRB 050110: IR Observations
  69. GRB 060109: Swift/UVOT upper limits
  70. GRB060109, optical observation
  71. GRB 060108: ISAS early observations and near IR upper limit
  72. GRB060108: P200 Ks Observations
  73. GRB 060108: early UKIRT K-band observations
  74. GRB 060108: VLT J-band observations
  75. GRB 060108: Mitsume optical observations
  76. GRB 060108: Swift/UVOT upper limits
  77. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  78. GRB060108: SDSS pre-burst observations
  79. GRB060108: Faulkes Telescope observation
  80. GRB060108, optical observation
  81. GRB 060108: Refined analysis of the Swift-BAT burst
  82. GRB060108: Swift detection of its 100th GRB
  83. GRB 060105: ISAS observations and near IR upper limit
  84. GRB 060105: Swift/UVOT upper limits
  85. GRB 060105: Mitsume optical observations
  86. GRB 060105: XRT refined analysis
  87. GRB060105: Suzaku-XIS and -HXD observation plan
  88. GRB060105, optical observation
  89. GRB060105: Swift detection of a bright long burst
  90. Swift-BAT trigger 175653 is probably not a GRB
  91. GRB 051221B: Optical Observations with Kuiper 1.54m
  92. GRB 051227: optical observation
  93. GRB 051227: optical afterglow
  94. GRB 051227: Magellan r'-band Imaging/Astrometry
  95. GRB 051227: refined analysis of VLT images
  96. GRB 051227: P60 Observations
  97. GRB 051227: MDM Observation
  98. GRB 051227: R-band object in the XRT error circle
  99. GRB051227: SDSS pre-burst observations
  100. GRB 051227, optical observation

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