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"

28256 results found.

  1. GRB 100814B: Fermi GBM detection
  2. GRB 100814A: optical observations
  3. GRB100816A: MITSuME optical upper limits
  4. GRB 100814A: NOT optical observations
  5. GRB 100816A: NOT optical observations
  6. GRB 100814A : Lulin optical observation
  7. GRB 100816A : Lulin r'-band observation
  8. GRB 100816A: Swift UVOT Observations
  9. GRB100816A Swift-XRT refined analysis
  10. GRB 100816A: Swift-BAT spectral lag results
  11. GRB 100816A: 1.23m CAHA optical observations
  12. GRB 100816A, Swift-BAT refined analysis
  13. GRB 100816A: Enhanced Swift-XRT position
  14. GRB 100816A: Gemini-N imaging
  15. GRB 100816A: TAROT Calern observatory optical detection
  16. GRB 100816A: MASTER Optical Limits
  17. GRB100816A: TNG optical afterglow confirmation.
  18. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  19. GRB 100814A: Fermi GBM observation
  20. GRB 100814A: Submm observations from APEX
  21. GRB 100814A: Swift-XRT refined analysis
  22. Swift/UVOT observations of GRB100814A
  23. GRB 100814A, Swift-BAT refined analysis
  24. GRB 100814A: Enhanced Swift-XRT position
  25. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  26. GRB 100814A: Swift UVOT observations of the optical afterglow
  27. GRB 100814A: Swift detection of a burst with an optical afterglow
  28. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  29. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  30. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  31. GRB 100802A: further NOT observation
  32. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  33. GRB 100807A: P200 Infrared Observations
  34. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  35. GRB100807A: optical observation in CrAO
  36. GRB 100805A: optical observation in CrAO
  37. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  38. GRB100807A: MITSuME optical upper limits
  39. GRB 100807A: Swift XRT refined analysis
  40. GRB 100807A: P60 Optical Afterglow Discovery
  41. GRB 100807A: Swift/UVOT Upper Limits
  42. GRB 100805A: SAO RAS optical observations
  43. GRB 100807A: Enhanced Swift-XRT position
  44. GRB 100807A: Swift-BAT refined analysis
  45. GRB 100807A: Swift detection of a burst
  46. GRB 100805A: IAC80 and 1.5m OSN optical observations
  47. GRB 100805A: Early RAPTOR Observations
  48. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  49. GRB 100802A: WIYN observations
  50. GRB 100805A: IAC80 BVR-band observations
  51. GRB 100805A: Swift-BAT refined analysis
  52. GRB 100805A: Swift-XRT Refined Analysis
  53. GRB 100805A: GRAS 002 optical observations
  54. Trigger 430975: Swift detection of a possible burst
  55. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  56. GRB 100805A: Enhanced Swift-XRT position
  57. GRB 100805A: Further P60 Monitoring
  58. GRB 100805A: P60 Optical Afterglow Candidate
  59. GRB 100805A: Swift detection of a burst with an optical counterpart
  60. GRB 100802A: Fermi GBM observation
  61. GRB 100728B: optical photometry of ISON-NM
  62. GRB 100713A: second epoch Maidanak optical observation
  63. GRB 100713A: CrAO optical limits
  64. GRB 100802A: NOT optical observation
  65. GRB100802A: MITSuME optical upper limits
  66. GRB 100802A: P60 Observations
  67. GRB 100802A: XRT refined analysis
  68. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  69. GRB 100728A: Suzaku WAM observation of the prompt emission
  70. GRB 100802A: Enhanced Swift-XRT position
  71. GRB 100802A: Swift-BAT refined analysis
  72. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  73. GRB 100802A: Swift detection of a burst
  74. GRB 100728B - NOT optical observation
  75. GRB 100728B: Swift/UVOT Observations
  76. GRB 100728B: Continued KAIT observations
  77. GRB 100728B, Swift-BAT refined analysis
  78. GRB 100728B: Swift-XRT Refined Analysis
  79. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  80. GRB 100727A: Swift/UVOT Upper Limits
  81. GRB 100728A, Swift-BAT refined analysis
  82. GRB 100728B: Enhanced Swift-XRT position
  83. GRB 100728A: Swift/UVOT Upper Limits
  84. GRB 100728A: Swift-XRT refined analysis
  85. GRB 100728B: GROND Detection of the NIR Afterglow
  86. GRB 100728B: optical detection
  87. GRB 100728B: Swift detection of a burst with an optical counterpart
  88. GRB 100728A: Enhanced Swift-XRT position
  89. GRB 100728A: Swift detection of a burst
  90. GRB 100727A: Swift XRT refined analysis
  91. GRB 100727A, Swift-BAT refined analysis
  92. GRB 100727A: Enhanced Swift-XRT position
  93. GRB 100727A: Swift detection of a burst
  94. GRB100725B: MITSuME optical upper limits
  95. GRB 100724B: AGILE/GRID analysis
  96. GRB 100724B: Suzaku WAM observation of the prompt emission
  97. GRB 100724B: gamma-ray detection by AGILE
  98. GRB 100725B: Swift-BAT refined analysis
  99. GRB 100725B: refined XRT analysis
  100. GRB 100725A: GROND upper limits

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