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"

19600 results found.

  1. GRB 110205A: PAIRITEL NIR Afterglow Detection
  2. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  3. GRB 110205A: TAROT Calern observatory detection of an optical flare
  4. GRB 110205A: TAROT Calern observatory optical detection
  5. GRB 110205A: Swift detection of a burst with an optical candidate
  6. GRB 110128A: Fermi GBM detection
  7. GRB110201A: MITSuME Okayama optical upper limits
  8. Swift/UVOT observations of GRB110201A
  9. GRB 110201A: Swift detection of a burst
  10. GRB110128A: MITSuME Okayama optical upper limits
  11. GRB 101112A: Maidanak and CrAO optical observations
  12. GRB110128A: TNG NIR observations
  13. GRB 110128A: Swift/UVOT observations
  14. GRB 110128A: WHT redshifts of nearby field galaxies
  15. GRB 110128A: Enhanced Swift-XRT position
  16. GRB 110128A: Afterglow detection from NOT
  17. GRB 110128A: TAROT Calern observatory upper limits
  18. GRB 110128A: Swift detection of a burst
  19. GRB 110106B, radio observations
  20. GRB 110120A: MASTER optical observations
  21. IPN triangulation of GRB 110120A
  22. GRB 101225A: CQUEAN optical observation
  23. GRB 110106A: CrAO optical observations
  24. GRB 110112A: optical upper limit
  25. GRB110119: Swift/UVOT Detection
  26. GRB 110119A: Swift-XRT refined Analysis
  27. GRB110119A: MITSuME Okayama optical upper limits
  28. GRB 110119A: PAIRITEL NIR Afterglow Detection
  29. GRB 110119A: Enhanced Swift-XRT position
  30. GRB 110119A: Swift detection of a burst with an optical detection
  31. GRB 101219B: GROND detection of a SN signature
  32. Swift-BAT trigger 442771 is a noise fluctuation
  33. New feature in Fermi GBM GRB Ground Position Notices
  34. Swift-BAT Trigger 442539 is not a GRB
  35. Swift Trigger 442539 is probably not a GRB
  36. Short GRB 110112B : early optical limit by "Pi of the Sky"
  37. GRB 110112B: Swift XRT and UVOT observations of the INTEGRAL burst
  38. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  39. GRB 110107A: Swift-XRT afterglow confirmation
  40. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  41. GRB 110112A: Swift/UVOT upper limits
  42. GRB 110112A: WHT candidate afterglow/host galaxy
  43. GRB 110112A: Swift-BAT refined analysis
  44. GRB 110112A: Enhanced Swift-XRT position
  45. GRB 110112A: Swift detection of a possible short burst
  46. GRB 110107A: Swift/UVOT upper limits
  47. GRB 101225a
  48. GRB 101219b. Possible radio afterglow detection.
  49. GRB 110107A: Swift-XRT Afterglow Candidate
  50. Short GRB 110106A: MASTER OT observations
  51. GRB 110106A: TNG NIR observations
  52. GRB 110106A: ISAS-Kanazawa optical upper limit
  53. GRB 110106A: MITSuME Okayama optical upper limits
  54. GRB 110106B: Enhanced Swift-XRT position
  55. GRB 110106A: Swift/UVOT Upper Limits
  56. GRB 110106A: Swift-XRT refined Analysis
  57. GRB 110106A: Enhanced Swift-XRT position
  58. GRB 110106B: Swift detection of a burst
  59. GRB 110106A: TNG optical observations and candidate counterparts
  60. GRB 110106A: Swift detection of a burst
  61. GRB 101225A: Host galaxy
  62. GRB110102A: Swift/UVOT observations
  63. GRB110102A: MITSuME Okayama Optical Observation
  64. GRB 110102A: Swift-BAT refined analysis
  65. GRB 110102A: Enhanced Swift-XRT position
  66. GRB 110102A: Swift detection of a burst with an optical detection
  67. GRB 101225A: P60 Observations
  68. GRB 101225A: MAXI/GSC observations
  69. GRB 101225A Late-time emission observed by Swift-BAT
  70. GRB 101225A, Swift-BAT refined analysis
  71. GRB 101225A: Swift/UVOT Detection
  72. GRB 101225A: Enhanced Swift-XRT position
  73. Trigger 441015 / GRB 101225A: Further NOT optical observation
  74. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  75. GRB 101225A (Swift trigger 441015): optical upper limit
  76. Trigger 441015: Swift detection of a possible burst or transient
  77. GRB 101224A: NOT optical observation
  78. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  79. GRB 101224A: Swift/UVOT Upper Limits
  80. GRB 101224A: Swift-XRT refined Analysis
  81. GRB101224A: MITSuME Okayama optical upper limits
  82. GRB 101224A, Swift-BAT refined analysis
  83. GRB 101224A - UVOT-enhanced XRT position
  84. GRB 101224A: Swift detection of a short burst
  85. GRB 101219A: Chandra Observations
  86. GRB 101219B: Swift/UVOT refined analysis
  87. GRB 101219B: Enhanced Swift-XRT position
  88. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  89. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  90. GRB 101219B: Fermi GBM observation
  91. GRB 101219A: IAC80 optical observations
  92. GRB 101219B: Swift detection of a burst with an optical afterglow
  93. GRB 101219A: Swift/UVOT Upper Limits
  94. GRB 101219A: GROND Upper limits
  95. GRB 101219A: Magellan NIR observations
  96. GRB 101219A: Further Gemini-South Imaging
  97. GRB 101219A - NOT observation - upper limit
  98. GRB 101219A: SARA-N Upper Limit
  99. GRB 101219A: REM optical and NIR observations
  100. GRB 101219A: Swift detection of a short hard burst

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