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"

36053 results found.

  1. GRB 060728: Swift detection of a burst
  2. GRB060614 ATCA Radio Limits
  3. GRB 060218 (SN 2006aj): IR afterglow detection six months after the
  4. GRB 060714: Swift/UVOT Observations
  5. GRB 060714: NOT observations
  6. GRB 060719: near-infrared afterglow
  7. GRB 060719: correction to the coordinates reported in GCN 5347
  8. GRB 060522: VLA observation
  9. GRB 060719: Swift/UVOT Upper Limits
  10. GRB 060719: VLT/ISAAC observations
  11. GRB 060719: Refined analysis of the Swift-BAT burst
  12. GRB 060719: XRT refined analysis
  13. GRB 060719: further analysis of VLT observations
  14. GRB 060719: optical limit by Pi-of-the-Sky
  15. GRB060719: FRAM early follow-up limit
  16. GRB 060719: prompt PROMPT observations
  17. GRB060719: REM NIR Observations
  18. GRB 060719: Continued LCO optical observations
  19. GRB 060719: VLT observations
  20. GRB 060719: LCO optical observations
  21. GRB 060719: Swift detection of a burst
  22. GRB 060717: Swift XRT refined analysis
  23. GRB 060714: OA fading and a possible host detection
  24. GRB060714: optical observations
  25. GRB 060717: NOT observations
  26. GRB 060714: Refined analysis of the Swift-BAT burst
  27. GRB 060717 optical upper limit
  28. GRB060717: Swift/UVOT upper limits
  29. GRB 060717: Swift XRT refined position
  30. GRB 060717: Swift-BAT refined analysis
  31. GRB060717 - SDSS Pre-burst Observations
  32. GRB 060714: REM infrared observations
  33. GRB 060717, optical observation
  34. GRB 060717: Swift detection of a burst
  35. GRB060714: correction to GCN 5324
  36. GRB060714: optical observations
  37. GRB 060714, SMARTS optical/IR afterglow observation
  38. GRB 060714 : Liverpool Telescope Observations
  39. GRB 060714: Swift XRT refined analysis
  40. GRB 060714: OA redshift
  41. GRB 060708: VLT spectroscopy
  42. GRB060708: MARGE low resolution spectrum observations
  43. GRB060714: optical observations
  44. Swift-BAT trigger 219136 is not a GRB
  45. Correction to Circular 5314: Circular refers to GRB 060714
  46. GRB060707 possible optical confirmation
  47. Swift trigger 219136 is probably not a GRB
  48. GRB 060714, optical observation
  49. GRB 060714: Swift detection of a burst with an UVOT optical afterglow
  50. GRB 060605: SkyNet Optical Limits
  51. GRB060712: P60 Observations
  52. GRB 060712: XRT refined analysis
  53. GRB 060712: Swift/UVOT Upper Limits
  54. GRB060526: optical observations
  55. GRB 060712: XRT refined position
  56. GRB 060712: Refined analysis of the Swift-BAT burst
  57. GRB060712: MASTER optical observation
  58. GRB120706: MASTER optical observation
  59. GRB 060712: Swift detection of a burst
  60. Host galaxy of GRB050904: 250 GHz upper limit with MAMBO at the IRAM 30m
  61. GRB 060708: PROMPT Optical Limits
  62. GRB 060707: OA fading and redshift
  63. GRB 060708: Swift-XRT refined analysis
  64. GCN 060708: Swift-UVOT Observations
  65. GRB 060708: Refined analysis of the Swift-BAT burst
  66. GCN 060707: Swift-UVOT observations
  67. GRB 060707: Swift-XRT refined analysis
  68. GRB 060708: Swift detection of a burst with an UVOT countpart
  69. GRB060707 possible optical confirmation
  70. GRB 060707: BOOTES-IR optical afterglow candidate
  71. GRB 060707: Refined analysis of the Swift-BAT burst
  72. GRB 060707: BOOTES-IR optical observation
  73. GRB 060707: Swift detection of a burst
  74. GRB 060515: Upper Limit on Host Galaxy
  75. GRB 050223: Magellan redshift
  76. GRB 060614: SMARTS host galaxy observations
  77. GRB 060614: Detection of a Possible, Late-Time Rebrightening
  78. Correction to GCN 5278 & GCN 5279 (GRBs 060105 & 060109)
  79. GRB 060109: Upper Limit on Host Galaxy
  80. GRB 060105: Upper limit on Host Galaxy
  81. GRB060614: Detection of the host galaxy but no supernova emission
  82. GRB 060614: redshift confirmation
  83. GRB 060614: Redshift
  84. Swift-BAT trigger 215279 is not a GRB
  85. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  86. GRB060614: Optical observations
  87. GRB 060614: spectroscopy
  88. GRB050326: Host Galaxy Candidates
  89. GRB050124: Possible Host Galaxy
  90. GRB050223: Host Galaxy
  91. GRB060512: near IR observations
  92. GRB060526: optical observations
  93. GRB 060614: pseudo-z from spectral parameters of the prompt emission
  94. Konus-Wind observation of GRB 060614
  95. GRB060605: optical observation
  96. The Unusually Long-Lived Afterglow of GRB 060614
  97. GRB 060614: optical observations
  98. GRB 060605, optical observations
  99. GRB 060614, SMARTS optical/IR afterglow observation
  100. GRB060614: SSO 1m 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