Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

42287 results found.

  1. GRB 060923C: Gemini Observations and Afterglow Candidate
  2. GRB 060923C, optical observation
  3. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  4. GRB 060923C: VLT J-band observations
  5. GRB060923B: Swift/UVOT upper limits
  6. GRB 060923B: Swift XRT Refined Analysis
  7. GRB 060923C: Swift XRT refined analysis
  8. GRB 060923C, Swift-BAT partial refined analysis
  9. GRB 060923A: Swift XRT refined analysis
  10. GRB 060923C: Keck Observations
  11. GRB 060923A: Keck and Gemini Observations
  12. GRB 060923C: Xinglong TNT optical observations
  13. GRB060923C : Faulkes Telescope South optical limits
  14. GRB060923C: Faulkes Telescope North optical observations
  15. GRB 060923C: optical observation
  16. GRB 060923C: Swift detection of a burst
  17. GRB 060923B: Swift detection of a burst
  18. GRB 060923, Swift-BAT refined analysis
  19. GRB 060923: UKIRT nIR observations - candidate afterglow
  20. GRB060923: Faulkes Telescope North optical observations
  21. GRB060923 - SDSS Pre-Burst Observations
  22. GRB 060923: KAIT observations
  23. GRB 060923: Swift detection of a burst
  24. Swift detection of IGR J17497-2821 (trigger 230504)
  25. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  26. GRB060919: Swift/UVOT optical observations
  27. GRB 060919 : Faulkes South Telescope Observations
  28. GRB 060919, Swift-BAT refined analysis
  29. GRB060919: XRT refined analysis
  30. GRB 060919: TAROT optical observations
  31. GRB 060919: Swift detection of a burst
  32. GRB 060912A: VLA Observation
  33. GRB 060912A: Probable Host Galaxy
  34. GRB060825: MAGIC telescope GeV observation
  35. Konus-Wind observation of GRB 060912
  36. GRB 060912: Redshift of nearby 2MASS galaxy
  37. GRB060912: optical observations
  38. GRB 060912B: Watcher observations
  39. GRB060912: Swift/UVOT Observations
  40. GRB060912: OPTIMA-Burst optical observations
  41. GRB 060912B: a long GRB detected with INTEGRAL
  42. GRB 060912: Swift XRT Team Refined Analysis
  43. GRB 060912, Swift-BAT refined analysis
  44. GRB 060912: Correction to GCN 5559
  45. GRB 060912: Xinglong TNT optical observations
  46. GRB 060912: Swift detection of a burst with an optical afterglow
  47. GRB060906: Danish/DFOSC optical observations
  48. VLA observations of GRB 060908
  49. GRB 060908: redshift
  50. GRB 060908, Swift/XRT refined analysis
  51. GRB 060908: Swift/UVOT Observations
  52. GRB 060908: Danish/DFOSC optical observations
  53. GRB 060908 - SDSS Pre-burst Observations
  54. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  55. GRB 060904B: Kiso Optical observation
  56. GRB 060904A : Optical limit
  57. GRB 060908: REM optical prompt observation
  58. GRB 060908: PROMPT Detection of a Bright Counterpart
  59. GRB 060908: Swift detection of a burst with a bright optical counterpart
  60. GRB 060904A: Suzaku/WAM observation of the prompt emission
  61. GRB060906 , optical observation
  62. GRB060904b optical detections (delayed report due to internet outage)
  63. GRB 060906: optical observation
  64. GRB 060906: Early RAPTOR optical limits
  65. GRB 060906: Swift/XRT Refined Analysis
  66. GRB 060906: Swift-UVOT observations
  67. VLT redshift of GRB 060906
  68. GRB 060906, Swift-BAT refined analysis
  69. GRB 060906: KAIT observations
  70. GRB 060906: Confirmation of P60 Optical Afterglow
  71. GRB 060906: observations with FRAM
  72. GRB 060906 (?): P60 Optical Afterglow Candidate
  73. GRB 060906: Swift detection of a probable burst
  74. GRB 060904A Milagro GeV/TeV Observations
  75. GRB060904b, optical observations
  76. GRB 060904b: SMARTS optical/IR afterglow observations
  77. GRB 060904B: RTT150 optical observations
  78. GRB060904A: Swift/UVOT optical observations
  79. GRB 060904A: Subaru NIR observation
  80. GRB 060904B: Swift-BAT refined analysis
  81. GRB060904b: Optical observations with Swift/UVOT
  82. GRB 060904B: Swift-XRT refined analysis
  83. GRB 060904A: Refined analysis of the Swift-BAT burst
  84. GRB 060904A: Swift-XRT refined analysis
  85. GRB 060904A: Suzaku-XIS and -HXD observation plan
  86. GRB 060904B: VLT redshift
  87. GRB 060904A: P60 Observations
  88. GRB 060904B: Optical observations at Crni Vrh
  89. GRB060904B: Watcher observations
  90. GRB 060904B BOOTES-IR and 1.5m OSN observations
  91. GRB 060904B: TAROT optical counterpart observations
  92. GRB060904B - SDSS Pre-Burst Observations
  93. GRB 060904: TAROT optical observations
  94. GRB 060904B: Swift detection of a burst with optical counterpart
  95. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  96. GRB060904 - SDSS Pre-Burst Observations
  97. GRB 060904: Swift detection of a bright burst
  98. GRB060901: Optical observations
  99. Konus-Wind observation of GRB 060901
  100. GRB 060901: SMARTS optical/IR observations update

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