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"

28229 results found.

  1. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  2. GRB 070110: Swift detection of a burst with a possible optical afterglow
  3. GRB 070107: Possible UVOT Afterglow
  4. GRB 070107, Swift-BAT refined analysis
  5. GRB 070107: Swift detection of a burst
  6. VLA observation of GRB 061222B
  7. VLA detection of GRB 061222A
  8. GRB070103: APO SPIcam i' and z' limits
  9. GRB070103: KPNO 4m+FLAMINGOS J limit
  10. GRB 070103: Swift/UVOT Upper limits
  11. GRB070103: Swift XRT refined analysis
  12. GRB 070103, Swift-BAT refined analysis
  13. GRB 070103: NOT observations
  14. GRB 070103: TAROT Calern observatory optical observations
  15. Retractions of previous Swift-BAT triggers
  16. erratum : SDSS Pre-burst Observations of GRB061126
  17. GRB 061210: Swift/XRT Astrometry Correction
  18. GRB 050826: MDM Redshift
  19. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  20. GRB 061222A: Xinglong Optical Limit
  21. GRB 061222A: Gemini Afterglow Candidate
  22. GRB 061222B, Swift-BAT refined analysis
  23. GRB061222A Swift/UVOT: Upper Limits
  24. GRB 061222B: Swift/UVOT Upper limits
  25. GRB 061222B: Observation with the KANATA 1.5m telescope
  26. GRB 061222A: Observation with the KANATA 1.5m telescope
  27. GRB 061222B: BOOTES-IR optical observations
  28. GRB 061222B: SARA upper limit
  29. GRB 061217: Magellan host galaxy redshift
  30. GRB 061222A, Swift-BAT refined analysis
  31. GRB 061222B: REM NIR/optical observations
  32. GRB 061222B: TAROT La Silla observatory optical observations
  33. GRB 061222B: Swift detection of a burst
  34. GRB 061222b: optical afterglow
  35. GRB 061222A: Prompt ROTSE-III Optical Limits
  36. GRB 061222: Swift detection of a burst
  37. GRB 061218: TAROT La Silla observatory optical observations
  38. GRB 061217: TAROT Calern observatory optical observations
  39. GRB 061218: TORTOREM optical upper limits
  40. GRB 061218, Swift-BAT refined analysis
  41. GRB061217: VLT NIR observations
  42. GRB 061218, SMARTS optical/IR observations
  43. GRB 061218: REM prompt observations
  44. Swift triggers (#251863) on a possible burst
  45. GRB061217: Swift/UVOT refined analysis.
  46. GRB 061217: optical observations at Calar Alto
  47. GRB061217 - Swift/XRT refined analysis
  48. GRB 061217, Swift-BAT refined analysis
  49. GRB 061217: Magellan Observations
  50. GRB 061217: REM prompt observations
  51. GRB 061217: ROTSE-III Optical Limits
  52. GRB061210: Swift/UVOT observations
  53. GRB 061210: Swift XRT analysis - Possible counterparts
  54. GRB 061210: Gemini/GMOS Observations
  55. GRB 061126: Radio Observations
  56. GRB061210: Radio Observations
  57. GRB 061202: Suzaku WAM observation of the prompt emission
  58. GRB 061210, Swift-BAT refined analysis of the SHB
  59. Optical Afterglow observations of GRB 061126
  60. GRB 060926: MASTER: discovery of the optical flare
  61. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  62. GRB 061202: TORTOREM optical upper limits
  63. GRB 061201: VLT optical decay
  64. GRB 061201: SOAR Confirmation of Candidate Afterglow
  65. GRB061202: FRAM early follow-up limit
  66. GRB061202 optical limit by "Pi of the Sky"
  67. GRB061202: optical/NIR observations with REM
  68. GRB061202: Swift/UVOT Upper Limits
  69. GRB 061202, Swift-BAT refined analysis
  70. GRB 061202: Swift detection of a burst
  71. GRB 061201: VLT optical observations
  72. GRB 061201: Initial UVOT Observations
  73. GRB 061201, Swift-BAT refined analysis of the SHB
  74. GRB 061201: Swift detection of a short hard burst
  75. INT+WFC observations of GRB 061126
  76. Swift XRT on-board boresight update
  77. GRB 061126: optical observation
  78. GRB 061126: Tautenburg afterglow observations
  79. GRB061126: Optical afterglow observations from MIRO
  80. GRB061126: Optical afterglow observations from MIRO
  81. GRB 061126 : SDSS Pre-Burst Observations
  82. GRB 061126: Swift-XRT refined analysis
  83. GRB 061126: Swift/UVOT Observations
  84. GRB 061126, Swift-BAT refined analysis
  85. GRB 061126: Early Detection of the IR Afterglow
  86. GRB 061126: Swift/UVOT Afterglow Detection
  87. GRB 061122: Candidate Optical Afterglow
  88. GRB 061121: Ep,i - Eiso correlation
  89. GRB061122: Swift/UVOT Optical Observations
  90. GRB061121: P60 Observations
  91. Radio detection of GRB 061121
  92. GRB061122: Swift-XRT position
  93. INTEGRAL results on GRB 061122
  94. Swift-BAT trigger 239987 is not a GRB
  95. GRB 061121: Swift/UVOT Observations
  96. GRB 061121: Swift-XRT Team Refined Analysis
  97. GRB 061121, Swift-BAT refined analysis
  98. GRB061121, optical observation
  99. GRB 061121: Optical observation at the KANATA 1.5m telescope
  100. GRB 061121: ROTSE-III Confirmation of Optical Counterpart

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