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"

43674 results found.

  1. GRB 060130: PROMPT Observations
  2. GRB060130: Further R-band imaging
  3. GRB 060130: Swift/XRT observation
  4. GRB 051211A: MDM Observations
  5. GRB 060123: Gemini spectroscopy of the putative host galaxy
  6. GRB 060123: VLA Radio Observations
  7. GRB060130: Optical imaging
  8. GRB060130: REM infrared observations
  9. GRB 060130, SMARTS optical observations
  10. GRB 060130: further INTEGRAL IBIS results
  11. GRB 060130: a long GRB detected with INTEGRAL
  12. Possible GRB 051221B: MDM Correction
  13. GRB050121: optical observation
  14. GRB050121b: optical observation
  15. GRB 060121: Confirmation of NIR Afterglow
  16. GRB 060123: Swift refined analysis of an unusual GRB
  17. GRB060124, BVRcIc field calibration
  18. GRB060105: refined analysis of the Suzaku observation
  19. GRB060124 optical observations
  20. GRB 060121: Probable Detection of NIR Afterglow
  21. GRB 060116 HST observations
  22. GRB 060124: HETE detection and spectrum of the main peak
  23. Refined XRT Position for GRB 060123
  24. Konus-Wind observation of GRB 060124
  25. GRB060124: detailed XRT analysis
  26. GRB 060124 Optical Observations
  27. GRB 060124: ART optical limits during the burst
  28. GRB060123: Optical and IR Imaging
  29. GRB 060123: P200 Observations
  30. GRB 060124: Keck optical spectrum
  31. GRB 060124: Keck Absorption Redshift
  32. GRB 060124: MDM Optical Spectrum
  33. GRB 060124: XRT refined analysis
  34. GRB 060124: R band Observations
  35. GRB 060124 : Optical observation at Xinglong and Kiso
  36. GRB060124: optical observations at Asiago
  37. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  38. GRB060123: SDSS pre-burst observations
  39. GRB 060123: Swift detection of a very long, faint burst
  40. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  41. GRB 060121: OHP optical limits
  42. GRB 060124: TAROT optical limits
  43. GRB 060124: Confirmation of the Afterglow
  44. GRB 060124: XRT position
  45. GRB 060124: Optical Afterglow Candidate from Tautenburg
  46. GRB060124, optical observation
  47. GRB 050124 : Kiso Optical limit
  48. GRB 060124: Optical Observations at Tautenburg
  49. GRB 060117: Suzaku WAM observation of the prompt emission
  50. GRB 060111B: Suzaku WAM observation of the prompt emission
  51. GRB 060124: Swift-BAT detection of a burst
  52. GRB 060116: Radio Detection
  53. GRB 060116: MARGE optical observations
  54. GRB 060121: Swift/UVOT upper limits
  55. GRB 060121: Liverpool Telescopes optical limits
  56. GRB 060121: Swift XRT refined analysis
  57. Konus-Wind observation of GRB 060121
  58. GRB 060121: I-band Limits
  59. GRB 060121: Confirmation of Afterglow
  60. GRB 060121: candidate optical counterpart
  61. GRB 060121: Swift XRT refined position
  62. GRB060121: SARA Observations
  63. GRB 060121: optical observations
  64. GRB 060121: Infrared Observations
  65. GRB 060121: optical observations
  66. GRB 060121: Optical imaging
  67. GRB060121 - SDSS pre-burst observations
  68. GRB 060121: A short-hard GRB in a cluster?
  69. GRB 060121 (=H4010): Results of preliminary spectral analysis
  70. GRB 060121: A bright short/hard GRB localized by HETE-2 SXC
  71. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  72. GRB 060117: PROMPT Observations
  73. GRB060117 - ATCA 3/6cm radio limits - correction
  74. GRB060117 - ATCA 3/6cm radio limits
  75. GRB 060116: photometric redshift - the farthest GRB?
  76. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  77. Correction to GCN 4542 on GRB 060117
  78. Konus-Wind observation of GRB 060117
  79. GRB 060116: possible I-J dropout
  80. GRB 060116: UKIRT IR Observations
  81. GRB060108: photometric redshift determination
  82. GRB 060117: Refined analysis of the Swift-BAT burst
  83. GRB 060116: PROMPT Observations
  84. GRB 060117: FRAM refined analysis
  85. GRB 060117: FRAM optical afterglow candidate
  86. GRB 060117: nearby galaxy
  87. GRB 060117: Swift-BAT detection of a bright burst
  88. GRB 060116: VLT optical observations
  89. GRB 060116: Refined analysis of the Swift-BAT burst
  90. GRB 060115: PROMPT Observations
  91. GRB 060116: XRT refined analysis
  92. GRB 060116: IR Candidate Afterglow
  93. GRB 060116: Swift/UVOT upper limits
  94. GRB060115: REM observations
  95. GRB 060110: XRT position and analysis
  96. GRB 060116: ROTSE-III Optical Limits
  97. GRB060116: XRT position
  98. GRB060116: Faulkes North observation
  99. GRB 060115: absorption redshift
  100. GRB 060116: Swift-BAT detection of a burst

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