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"

28096 results found.

  1. GRB 080205: Swift/UVOT observations
  2. GRB 080205: Enhanced Swift-XRT position
  3. Swift-BAT Trigger #302454, correction of GCN notice, update on AX J1749.1-2639
  4. GRB 080130: Swift-BAT refined analysis
  5. GRB 080130: further Swift XRT observations confirm fading source
  6. GRB 080129: Swift/UVOT Refined Upper Limits
  7. Swift/UVOT observations of GRB080130
  8. GRB 080130: REM NIR observations
  9. GRB 080130(?): Swift XRT observation
  10. GRB 080129: Swift-XRT refined analysis
  11. GRB 080129: KAIT optical limits
  12. GRB 080129, Swift-BAT refined analysis
  13. GRB 080129: TAROT La Silla observatory optical observations
  14. GRB 080129: GROND detection in all bands, and fading
  15. GRB 080129: GROND detection of the optical/NIR afterglow, and fading
  16. GRB 080129: Enhanced Swift-XRT position
  17. GRB 080129: Gemini-South Imaging Observations
  18. GRB 080129 (?): UVOT Upper Limits
  19. A new website of high-level data products for Swift GRBs
  20. GRB 080123 : Suzaku WAM observation of the prompt emission
  21. Transient 080109/SN 2008D: Spectroscopic Evolution
  22. Konus-Wind observation of GRB 080122
  23. GRB 080122 : Suzaku WAM observation of the prompt emission
  24. GRB 080121: Swift/UVOT upper limits
  25. SNe 2008D and 2007uy: Chandra Detections
  26. GRB 080121: Enhanced Swift-XRT position
  27. Transient 080109/SN 2008D: Spectroscopic Evolution and Re-Classification
  28. IPN triangulation of GRB080122
  29. GRB 080121: Nearby SDSS galaxies
  30. GRB 080123: Swift-XRT refined analysis
  31. GRB 080123: Swift/UVOT refined analysis
  32. GRB 080123, Swift-BAT refined analysis
  33. GRB 080123: Enhanced Swift-XRT position
  34. GRB 080123: Swift detection of a short burst
  35. GRB 080120: GROND confirmation of the optical afterglow
  36. VLA radio upper limit on GRB 080120
  37. GRB 080120: Swift-XRT refined analysis
  38. GRB 080120: GROND detection
  39. GRB080120: Swift XRT position
  40. GRB 080120: a long GRB detected by INTEGRAL
  41. Transient in NGC2770 / SN2008D: Metallicity of nearby HII regions
  42. Transient XRF 080109 / SN 2008D: Mount Abu NIR observations
  43. XRF 080109 / SN 2008D: UKIRT JHK imaging
  44. optical observations, XRT in NGC 2770
  45. XRF 080109/SN 2008D: PROMPT Optical Imaging
  46. Gemini-South observations of XRF 080109 / SN 2008D
  47. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  48. Discovery of Radio Emission from Transient in NGC 2770
  49. XRF 080109 in NGC2770: NIR observations at TNG
  50. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  51. XRB 080109/SN 2008D:PAIRITEL NIR observations and t_0 from Swift
  52. XRF 080109 in NGC2770: Detectable Superluminal Motion
  53. Refined Swift-XRT analysis of the transient in NGC 2770
  54. Bright X-ray Transient in NGC 2770 - A low-luminosity XRF?
  55. GRB 071227: Suzaku WAM observation of the prompt emission
  56. GRB 071227: optical afterglow
  57. Further Swift-BAT analysis of GRB 071227
  58. Konus-Wind observation of GRB 071227
  59. GRB 071227: Swift-XRT refined analysis
  60. GRB 071227: VLT probable redshift of the candidate host galaxy
  61. GRB071227: Swift/UVOT refined analysis
  62. GRB 071227: REM NIR and Optical observations
  63. Swift-BAT refined analysis of short GRB 071227
  64. GRB 071227: Swift detection of a burst
  65. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  66. GRB 071125: Suzaku WAM observation of the prompt emission
  67. GRB 070429B: Probable host galaxy and redshift
  68. GRB 071129, Swift-BAT refined analysis
  69. GRB 071126: Enhanced Swift-XRT position
  70. GRB071122: Swift/UVOT Observations
  71. GRB071104: NIR Afterglow Candidate at TNG
  72. GRB 071122, Swift-BAT refined analysis
  73. GRB 071122 Swift-XRT refined analysis
  74. GRB 071122: P60 Optical Afterglow Candidate
  75. GRB 071122: Swift detection of a burst
  76. GRB 071118: P60 Observations
  77. GRB071118 MITSuME OAO optical observation
  78. GRB 071118: Observations from OSN
  79. GRB 071117: VLT observations and probable redshift
  80. Swift/UVOT observations of GRB071118
  81. Konus-Wind and Konus-A observations of GRB 071117
  82. Swift XRT follow-up observations of GRB071008
  83. Swift/UVOT upper limits for GRB 071117
  84. GRB071118: Swift XRT refined analysis
  85. GRB 071117: Gemini Optical Afterglow Discovery
  86. GRB 071118, Swift-BAT refined analysis
  87. GRB 071117: TAROT La Silla observatory optical observations
  88. GRB 071118: Swift detection of a burst
  89. GRB 071117: Gemini Observations
  90. GRB 071117: Swift-XRT refined analysis
  91. GRB 071117, Swift-BAT refined analysis
  92. Swift detection of MXB 0656-072
  93. GRB 071112C: Optical and NIR data observed with KANATA
  94. GRB 071112C MITSuME Akeno early optical observation
  95. GRB 071112C: SARA upper limit
  96. GRB 071112C : Second Epoch Lulin R-band observations
  97. GRB071112C MITSuME Okayama Optical Observation
  98. GRB 071112C: Swift-BAT refined analysis
  99. GRB 071112C: Swift XRT refined analysis
  100. Swift UVOT upper limits of GRB071112B

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