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"

20362 results found.

  1. GRB 060712: XRT refined position
  2. GRB 060707: OA fading and redshift
  3. GRB 060708: Swift-XRT refined analysis
  4. GCN 060708: Swift-UVOT Observations
  5. GCN 060707: Swift-UVOT observations
  6. GRB 060708: Swift detection of a burst with an UVOT countpart
  7. GRB 060515: Upper Limit on Host Galaxy
  8. GRB 060109: Upper Limit on Host Galaxy
  9. GRB 060105: Upper limit on Host Galaxy
  10. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  11. GRB050326: Host Galaxy Candidates
  12. GRB050124: Possible Host Galaxy
  13. GRB050223: Host Galaxy
  14. GRB060605: optical observation
  15. GRB 060605, optical observations
  16. GRB 060614: Swift/UVOT Observations
  17. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  18. GRB 060602A: Swift/XRT analysis
  19. GRB 060610: KAIT observations
  20. GRB 060607: RTT150 optical observations
  21. GRB060602A: Swift/UVOT upper limits
  22. GRB 060607B: Swift detection of a burst
  23. GCN 060607: Swift-UVOT obswervations.
  24. GRB 060607: IR observations
  25. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  26. GRB 060605: RTT150 optical observations
  27. GRB 060607: REM NIR afterglow
  28. GRB 060607: Swift detection of a burst with bright optical counterpart
  29. GRB 060522: PROMPT Optical Limits
  30. GRB 060605: Xinglong TNT optical observations
  31. GRB060602B : REM infrared observations
  32. GRB060605: Swift/UVOT detections
  33. GRB 060605: RTT150 optical observations
  34. GRB 060605: Swift detection of a burst with optical counterpart
  35. GRB060604: Swift/UVOT detections
  36. GRB 060604: redshift
  37. GRB 060604A: ROTSE-III Optical Limits
  38. GRB 060604: Swift detection of a burst with possible optical counterpart
  39. GRB 060602B: XMM-Newton Survey Source
  40. GRB 060602B: Swift/UVOT observations
  41. GRB060602A: optical observations(/transient?)
  42. GRB 060602B: Swift detection of a burst
  43. GRB060602B: Watcher observations - no OT candidate
  44. GRB060602 - SDSS Pre-Burst Observations
  45. GRB 060502A: Optical afterglow observations
  46. GRB 060526: Break in X-ray light curve
  47. GRB060526, optical observations
  48. GRB 051227 : WIDGET simultaneous optical observations
  49. GRB 051028 : WIDGET pre-trigger limit
  50. GRB060526: Optical counterpart from MIRO
  51. GRB 060526: RTT150 optical observations
  52. GRB060526: optical observations
  53. GRB 060526: REM observations
  54. GRB 060526: RTT150 optical observations, afterglow flattening
  55. GRB 060526: RTT150 optical observations
  56. GRB060526, optical observations
  57. GRB 060526: TNG optical observations
  58. GRB 060526: Watcher Observations
  59. GRB060526 - SDSS Pre-burst Observations
  60. GRB 060526: Continued emission for the Swift burst
  61. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  62. GRB060505: VLT observations of the optical afterglow
  63. GRB 060413 : WIDGET simultaneous optical observations
  64. XMM-Newton observation of GRB060510b
  65. GRB060512: Late-Time P200 Observations
  66. GRB 060522: Swift/XRT Team refined analysis
  67. GRB 060522: REM NIR observations
  68. GRB 060522: TNG optical observations
  69. GRB 060515: NIR observation
  70. GRB060515: P200 NIR Observations
  71. GRB 060505 BAT refined analysis
  72. GRB 060515 BAT refined analysis
  73. GRB 060512: TAROT optical observation
  74. GRB 060515: Swift/XRT Team refined analysis
  75. GRB 060515: Swift/UVOT Upper Limits
  76. GRB 060515: Swift/XRT position
  77. GRB 060515: Super-LOTIS Observations
  78. GRB 060515: TAROT optical observation
  79. GRB 060512: Subaru NIR observation
  80. GRB 060512: 1.54m Kuiper Observations
  81. GRB 060512: Detection of NIR afterglow
  82. GRB 060512: P60 Observations
  83. GRB 060512: Swift-BAT Refined Analysis
  84. GRB 060505 - OT candidate + galaxy spectrum
  85. GRB 060512: REM NIR observations
  86. GRB060512 - SDSS Pre-Burst Observations
  87. GRB 060512: Swift detection of a burst with an optical afterglow
  88. GRB 060505: X-ray afterglow - Correction -
  89. GRB 060505: X-ray afterglow
  90. GRB060418: optical observations
  91. GRB060510 - SDSS Pre-Burst Observations
  92. GRB 060510B: Swift detection of a burst
  93. GRB 060510: Swift detection of a burst with optical transient
  94. GRB060507: optical afterglow detection
  95. GRB060502B: improvement in the XRT afterglow position
  96. GRB 060505: PROMPT Observations
  97. GRB 060507: Swift XRT Team Refined Analysis
  98. GRB060505: Swift/UVOT Observations
  99. GRB060425: new MASTER survey method
  100. GRB 060306: Further Analysis of SOAR and APO NIR 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