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"

32688 results found.

  1. GRB 060110: Super-LOTIS observations
  2. GRB 060110: Optical observation
  3. GRB 060110: Correction
  4. Correction to GRB 060109 XRT analysis
  5. GRB 050110: IR Observations
  6. GRB 060110: Optical limit
  7. GRB 060109: Refined Swift-XRT analysis
  8. GRB 060109: Swift/UVOT upper limits
  9. GRB060109, optical observation
  10. GRB 060108: ISAS early observations and near IR upper limit
  11. GRB060108: P200 Ks Observations
  12. GRB 060108: early UKIRT K-band observations
  13. Swift UVOT correction to GCN 4455
  14. GRB 060108: a dark burst?
  15. GRB 060108: Refined XRT analysis
  16. GRB 060108: VLT J-band observations
  17. GRB 060108: Mitsume optical observations
  18. GRB 060108: Swift/UVOT upper limits
  19. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  20. GRB060108: SDSS pre-burst observations
  21. GRB060108: Faulkes Telescope observation
  22. GRB 060108: Refined analysis of the Swift-BAT burst
  23. GRB 060108: Swift XRT position
  24. GRB 060105: Radio observations
  25. GRB 060105: MDM Observation
  26. Konus-Wind observation of GRB 060105
  27. GRB 060105: ISAS observations and near IR upper limit
  28. GRB 060105: Swift/UVOT upper limits
  29. GRB 060105: Mitsume optical observations
  30. GRB 060105: BAT refined analysis
  31. GRB 060102 - no XRT afterglow
  32. GRB 060105: XRT refined analysis
  33. GRB060105: Suzaku-XIS and -HXD observation plan
  34. GRB060105, optical observation
  35. GRB060105: Swift detection of a bright long burst
  36. Swift-BAT trigger 175653 is not an astrophysical source
  37. GRB 060102: MDM Observation
  38. Swift-BAT trigger 175653 is probably not a GRB
  39. GRB 060102: Swift-BAT refined analysis
  40. Time Correction to GRB 060102
  41. GRB 060102: Swift-BAT detection of a burst
  42. GRB051211B: optical observations
  43. GRB051227: SARA Observations
  44. GRB 051221B: Optical Observations with Kuiper 1.54m
  45. GRB 051227: Likely host galaxy underlying afterglow position
  46. GRB 051227: optical observation
  47. GRB051221B: Radio observations
  48. GRB 051221A: VLA Radio Observations
  49. GRB051227: Radio Observations
  50. GRB 051227: Confirmed fading from Gemini observations
  51. GRB051227: further analysis of VLT images
  52. GRB 051227: optical afterglow
  53. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  54. GRB 051227: Gemini observations
  55. GRB 051227: Keck Spectroscopy
  56. GRB 051227: Magellan r'-band Imaging/Astrometry
  57. GRB 051227: refined analysis of VLT images
  58. GRB 051227: P60 Observations
  59. GRB 051227: MDM Observation
  60. GRB 051227: R-band object in the XRT error circle
  61. GRB 051227: Joint Swift-HETE Spectral Analysis
  62. GRB 051227: XRT refined analysis
  63. GRB 051227: Refined analysis of the Swift-BAT burst
  64. GRB 051227, optical observation
  65. GRB051117B: optical observation
  66. Konus-Wind observation of GRB 051221A
  67. GRB 051221A: MDM Optical Observations
  68. GRB 051221A: Detection at 251nm with Swift UVOT
  69. GRB 051221A: Chandra Afterglow Position
  70. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  71. GRB 051221B: ROTSE-III Optical Limits
  72. GRB 051221B: TAROT optical limits
  73. GRB 051221A: WSRT Radio Observations
  74. GRB 051221: Redshift from Gemini
  75. GRB 051221: Continued fading of optical afterglow
  76. GRB 051221B: Refined analysis of the Swift-BAT burst
  77. Possible GRB 051221B: MDM Optical Detection
  78. GRB 051221A: RAPTOR Fading Counterpart Constraint
  79. Possible GRB 051221B: Swift XRT position
  80. GRB 051221: Discovery of fading optical afterglow
  81. GRB 051221: Swift XRT refined analysis
  82. GRB 051221: Swift/UVOT upper limits
  83. GRB 051221: Possible nearby cluster
  84. GRB 051221: Correction to GCN #4368
  85. GRB 051221: Gemini observations
  86. GRB 051221: Improved astrometry of the IR counterpart
  87. GRB051221: K-band source
  88. GRB 051221: XRT position
  89. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  90. GRB 051221: IR Observations at GRB+1hr
  91. Refined analysis of the SWIFT J1626.6-5156
  92. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  93. GRB051211A (=H3979): Refined Analysis
  94. GRB 051211B: optical afterglow
  95. GRB051211A: possible optical candidate
  96. Swift Trigger 172767 is not a GRB
  97. GRB 051215: near-infrared observations
  98. GRB051215 - SDSS pre-burst observations
  99. GRB 051215: A short GRB in a cluster?
  100. GRB051211B: Probable radio afterglow

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