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"

28125 results found.

  1. GRB 111212A: Enhanced Swift-XRT position
  2. GRB 111212A: Swift-XRT observations
  3. GRB 111211A: GROND afterglow candidate
  4. GRB 111211A: SuperAGILE localization of a long GRB
  5. Konus-Wind observation of GRB 111209A
  6. GRB 111210A: GROND observations
  7. GRB 111210A: SDSS prior imaging
  8. GRB 111210A: Swift-XRT refined Analysis
  9. GRB 111210A: MITSuME Okayama Optical upper limits
  10. GRB 111208A: Swift-XRT refined analysis
  11. GRB 111210A: Gemini-North candidate counterpart
  12. GRB111210A: MITSuME Okayama J-band upper-limit
  13. GRB 111210A: Swift/UVOT Upper Limits
  14. GRB 111210A: Enhanced Swift-XRT position
  15. GRB 111210A: Swift-BAT refined analysis
  16. GRB 111210A: Swift detection of a burst
  17. GRB 111209A: VLT/X-shooter redshift
  18. GRB 111209A: GROND Afterglow observations
  19. GRB 111209A optical limit by "Pi of the Sky"
  20. GRB 111209A: PROMPT optical observations of early afterglow
  21. GRB 111208A: Lightbuckets Optical Observations
  22. GRB 111209A: Swift-XRT refined Analysis
  23. GRB 111209A: Swift UVOT refined analysis
  24. GRB 111209A: Swift Burst of Interest
  25. GRB 111209A, Swift-BAT refined analysis
  26. GRB 111209A: Enhanced Swift-XRT position
  27. GRB 111205A: GROND observations
  28. GRB 111209A: REM NIR detection
  29. GRB 111209A: TAROT La Silla observatory optical detection
  30. GRB 111209A: Swift detection of a long burst with an optical counterpart
  31. GRB 111208A: Swift XRT/UVOT observations
  32. GRB 111205A: Swift XRT Observations
  33. GRB 111207A found in ground analysis of BAT data
  34. GRB 111208A found in ground analysis of BAT data
  35. GRB 111204A: TNG NIR observations
  36. GRB 111201A: GMG optical observation
  37. GRB 111204A: GROND Observations
  38. GRB 111204A: Swift-XRT refined Analysis
  39. GRB 111204A, Swift-BAT refined analysis
  40. GRB 111022B: CrAO optical limit
  41. GRB 111204A: Swift/UVOT Upper Limits
  42. GRB 110921A: optical observations in Maidanak observatory
  43. GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
  44. GRB 111204A: Enhanced Swift-XRT position
  45. GRB 111123A: optical upper limit in CrAO
  46. GRB 111204A: Swift detection of a burst
  47. GRB 111201A: Swift/UVOT Upper Limits
  48. GRB111201A: Swift-XRT observations
  49. GRB 111201A found in ground analysis of BAT data
  50. GRB 111121A: Suzaku WAM observation of the prompt emission
  51. GRB 111129A: Swift/UVOT Detection
  52. GRB 111129A, GROND afterglow observations
  53. GRB 111129A: Swift-XRT refined Analysis
  54. GRB 111129A: Swift-BAT refined analysis
  55. GRB 111129A: Enhanced Swift-XRT position
  56. GRB 111129A: Swift detection of a burst with an optical counterpart
  57. GRB 111123A, Swift-BAT refined analysis
  58. GRB 111123A: Swift/UVOT Upper Limits
  59. GRB 111123A - NOT optical observations
  60. GRB 111123A, GROND observations
  61. GRB 111123A: TNG NIR detection of the afterglow candidate
  62. GRB 111123A: Swift-XRT refined Analysis
  63. GRB 111123A: MITSuME Okayama Optical upper limits
  64. GRB 111123A: Enhanced Swift-XRT position
  65. GRB 111123A: GMG optical observation
  66. GRB 111123A: Swift detection of a burst
  67. GRB 111117A, the review of the sky area in plate archives
  68. GRB 111121A: Swift/UVOT Upper Limits
  69. GRB 111121A: Magellan/Megacam observations
  70. GRB 111121A: Swift-XRT refined Analysis
  71. GRB 111121A: Swift-BAT refined analysis
  72. GRB 111117A: Chandra detection of the afterglow
  73. GRB 111121A: Enhanced Swift-XRT position
  74. GRB 111121A: Swift detection of a short hard burst
  75. GRB 111117A: Gemini Afterglow Limits
  76. GRB 111117A: optical upper limit in CrAO
  77. GRB 111117A: Fermi GBM observation
  78. GRB 111117A: TNG observations
  79. GRB 111117A: Swift/UVOT Upper Limits
  80. GRB 111117A: GROND observations
  81. GRB 111117A: Gemini host observation
  82. GRB 111117A: Swift-XRT refined Analysis
  83. GRB 111117A: NOT observations
  84. GRB 111117A: Chandra ToO observation scheduled
  85. GRB 111117A: Swift-BAT refined analysis of a short hard burst
  86. GRB 111117A: GMG upper limit
  87. GRB 111117A: Swift detection of a short hard burst
  88. GRB111107A: ATCA observations - upper limit and a possible detection
  89. IPN Triangulation of GRB 111113A (short/hard/intense)
  90. XRF 111111A/MAXI J0158-744: MAXI GSC and SSC detection of a soft X-ray transient near SMC
  91. GRB 111109A: Swift-XRT refined Analysis
  92. GRB 111109A: Swift/UVOT Photometry
  93. GRB 111109A: Swift-BAT refined analysis
  94. GRB 111109A: Enhanced Swift-XRT position
  95. GRB 111109A: Swift-XRT observations
  96. GRB 111109A: Swift detection of a burst
  97. GRB 111103B: optical upper limit of CrAO
  98. GRB 111103B: optical upper limit of Mt. Terskol observatory
  99. GRB 111107A: Fermi GBM observation
  100. Continued Skynet observations of GRB111107A

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