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"

28052 results found.

  1. GRB 060123: Swift refined analysis of an unusual GRB
  2. GRB060124, BVRcIc field calibration
  3. GRB 060121: Probable Detection of NIR Afterglow
  4. GRB 060116 HST observations
  5. GRB 060124: HETE detection and spectrum of the main peak
  6. GRB060124: detailed XRT analysis
  7. GRB 060124: ART optical limits during the burst
  8. GRB060123: Optical and IR Imaging
  9. GRB 060123: P200 Observations
  10. GRB 060124: XRT refined analysis
  11. GRB 060124: R band Observations
  12. GRB 060124 : Optical observation at Xinglong and Kiso
  13. GRB060124: optical observations at Asiago
  14. GRB060123: SDSS pre-burst observations
  15. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  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 060117: Suzaku WAM observation of the prompt emission
  21. GRB 060111B: Suzaku WAM observation of the prompt emission
  22. GRB 060124: Swift-BAT detection of a burst
  23. GRB 060121: Liverpool Telescopes optical limits
  24. GRB 060121: Swift XRT refined analysis
  25. Konus-Wind observation of GRB 060121
  26. GRB 060121: candidate optical counterpart
  27. GRB 060121: Infrared Observations
  28. GRB 060121: optical observations
  29. GRB 060121: Optical imaging
  30. GRB060121 - SDSS pre-burst observations
  31. HETE Alert 4006: MASTER promt optical limit
  32. GRB060117 - ATCA 3/6cm radio limits - correction
  33. GRB060117 - ATCA 3/6cm radio limits
  34. GRB 060116: photometric redshift - the farthest GRB?
  35. Konus-Wind observation of GRB 060117
  36. GRB 060116: UKIRT IR Observations
  37. GRB 060117: Refined analysis of the Swift-BAT burst
  38. GRB 060117: FRAM optical afterglow candidate
  39. GRB 060117: nearby galaxy
  40. GRB 060116: VLT optical observations
  41. GRB 060116: Refined analysis of the Swift-BAT burst
  42. GRB 060116: XRT refined analysis
  43. GRB 060116: IR Candidate Afterglow
  44. GRB 060116: Swift/UVOT upper limits
  45. GRB060115: REM observations
  46. GRB 060110: XRT position and analysis
  47. GRB 060116 : Lulin optical limit
  48. GRB060116: Faulkes North observation
  49. GRB 060116: Swift-BAT detection of a burst
  50. GRB 060115: Refined analysis of the Swift-BAT burst
  51. GRB 060115: Swift/UVOT upper limits
  52. GRB 060114: REM observations
  53. GRB 060115: Swift XRT refined analysis
  54. GRB 060114: Swift/UVOT Observations
  55. GRB060115, optical observation
  56. GRB 060115: MITSuME optical afterglow candidate
  57. GRB 060115: Swift detection of a burst
  58. GRB060114, optical observation
  59. GRB060114: Faulkes North observation
  60. GRB 060108: IR observations of afterglow
  61. GRB 060108: Evidence for an XRT Position Offset
  62. GRB 060110: KAIT observations
  63. GRB 060111B: Swift XRT refined analysis
  64. GRB 060111B: MITSuME detection of optical afterglow
  65. GRB 060111B: TAROT optical observation
  66. GRB060111A: RTT150 optical observations
  67. GRB060111B: RTT150, possible host galaxy
  68. GRB 060111B: Refined analysis of the Swift-BAT burst
  69. GRB 060111(a): P60 Observations
  70. GRB 060111B: Gualba observatory limit
  71. GRB 060111B: Swift detection of a burst
  72. GRB 060111: Swift-BAT Refined Analysis
  73. GRB060111.2:_MASTER optical limit
  74. GRB 060108: VLT K-band observations
  75. GRB 060111: TAROT optical observation
  76. GRB 060111: Swift detection of a burst
  77. GRB 060110: Mitsume optical observations
  78. GRB 060110: Swift-BAT refined analysis
  79. GRB 060109: Swift-BAT refined analysis
  80. GRB 060108: z-band imaging from Gemini-North
  81. GRB 060110a: RAPTOR detection of early optical emission.
  82. GRB 060110: UKIRT K-band observations
  83. GRB 060110: IR Candidate Afterglow
  84. GRB060110, optical observation
  85. GRB 060110: Correction
  86. Correction to GRB 060109 XRT analysis
  87. GRB 050110: IR Observations
  88. GRB 060109: Refined Swift-XRT analysis
  89. GRB 060109: Swift/UVOT upper limits
  90. GRB060109, optical observation
  91. GRB 060108: ISAS early observations and near IR upper limit
  92. GRB060108: P200 Ks Observations
  93. GRB 060108: early UKIRT K-band observations
  94. GRB 060108: a dark burst?
  95. GRB 060108: Refined XRT analysis
  96. GRB 060108: VLT J-band observations
  97. GRB 060108: Mitsume optical observations
  98. GRB 060108: Swift/UVOT upper limits
  99. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  100. GRB060108: SDSS pre-burst observations

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