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"

28221 results found.

  1. GRB 110213A: optical observations in Mondy
  2. OT 110215: possible GRB from 2MASS J00264184+8324093
  3. Swift/UVOT observations of GRB110210a.
  4. GRB 110210A: optical upper limit
  5. GRB 110213B: Gemini South Redshift
  6. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  7. GRB 110210A: ROVOR Upper Limit
  8. GRB 110213A: YNAO-GMG Observations
  9. GRB 110213B: P60 Optical Afterglow Candidate
  10. GRB 110213A: TNT optical observations
  11. GRB 110212A: Swift XRT and UVOT observations
  12. GRB 110213B: Swift XRT observation
  13. GRB 110213A: MITSuME Akeno Optical Observation
  14. GRB 110213A: Swift-XRT refined Analysis
  15. GRB110213A: MITSuME Okayama Optical Observation
  16. GRB 110213A: THO optical observations
  17. GRB 110213B: MAXI/GSC detection of a probable GRB
  18. GRB 110213A: Lightbuckets Optical Observations
  19. GRB 110213A: optical observations
  20. GRB 110213A: Enhanced Swift-XRT position
  21. GRB 110213A: KAIT observations
  22. GRB 110213A: GRAS011 optical observations
  23. GRB 110213A: Bok Telescope Redshift
  24. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  25. GRB 110213A: P60 Optical Afterglow Detection
  26. GRB 110213A: Swift detection of a burst with optical afterglow
  27. GRB 110212A: GRT Optical Observation
  28. GRB 110212A: Swift detection of a burst
  29. GRB 110201A: Subaru/MOIRCS Ks-band photometry
  30. GRB 110205A: detection of optical linear polarization from CAHA
  31. GRB 110210A: optical upper limit
  32. GRB 110210A: Swift-XRT refined Analysis
  33. GRB 110210A: Enhanced Swift-XRT position
  34. GRB 110201A: optical observations
  35. GRB 110210A: Swift detection of a burst
  36. GRB 110206A: Swift-XRT confirmation of the X-ray afterglow
  37. GRB 110208A: Magellan confirmation of the optical afterglow
  38. Fermi GBM detection of a burst from 1E 1841-045
  39. Swift/UVOT observations of GRB110208a
  40. GRB 110208A: Potential afterglow from Magellan
  41. GRB 110207A: Swift-XRT observations
  42. GRB 110208A: Swift-XRT refined Analysis
  43. GRB 110208A: Enhanced Swift-XRT position
  44. GRB 110208A: Magellan optical observations
  45. GRB 110206A: SMARTS optical/IR afterglow decay
  46. GRB 110208A: Swift detection of a burst
  47. SGR-like outburst from the magnetar 1E 1841-04.5
  48. GRB 110205A: optical observations in Mondy observatory
  49. GRB 110205A : HCT optical observations
  50. GRB 110206A: Decay of afterglow candidate
  51. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  52. GRB 110205A - Continued PAIRITEL NIR Observations
  53. GRB 110206A: GROND detection of afterglow candidate
  54. GRB 110205A: WSRT radio observation
  55. GRB 110206A: UVOT detection of afterglow candidate
  56. GRB110205A: CARMA 3mm Observations
  57. Konus-Wind observation of GRB 110205A
  58. GRB 110207A: Swift detection of a burst
  59. GRB 110206A: Swift detection of a probable X-ray afterglow
  60. GRB 110205A: Lightbuckets Optical Observations
  61. GRB 110205A : Lulin optical observation
  62. GRB110205A: MITSuME Ishigakijima Optical Observation
  63. GRB110205A: MITSuME Okayama Optical Observation
  64. GRB110205A: SMA 1.3mm Observations
  65. GRB 110205A: Lulin optical observations and temporal decay index
  66. Observations GRB 110205A
  67. GRB 110205A: Newcastle Observatory Optical Observations
  68. GRB 110205A: Swift-XRT refined Analysis
  69. GRB 110205A: LOAO B/R Observation
  70. GRB 101225A is likely at z~0
  71. GRB 110205A: optical flare confirmation
  72. GRB 110205A: NOT redshift confirmation
  73. GRB 110205A: Enhanced Swift-XRT position
  74. GRB 110205A: FAST Redshift
  75. GRB 110205A: GRAS005 optical observations
  76. GRB 110205A: PAIRITEL NIR Afterglow Detection
  77. GRB 110205A: Swift/UVOT Confirmation of Flaring Afterglow
  78. GRB 110205A: Liverpool Telescope Afterglow Confirmation
  79. GRB 110205A: TAROT Calern observatory detection of an optical flare
  80. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  81. GRB 110205A: TAROT Calern observatory optical detection
  82. GRB 110205A: Swift detection of a burst with an optical candidate
  83. GRB 110128A: Fermi GBM detection
  84. GRB 110201A: Swift-XRT refined Analysis
  85. GRB110201A: MITSuME Okayama optical upper limits
  86. Swift/UVOT observations of GRB110201A
  87. GRB 110201A: MASTER optical observations
  88. GRB 110201A: Swift detection of a burst
  89. GRB101224A: EVLA Observations
  90. GRB110112A: EVLA Observations
  91. GRB110128A: MITSuME Okayama optical upper limits
  92. GRB 110125A: Fermi GBM detection
  93. GRB 101112A: Maidanak and CrAO optical observations
  94. GRB110128A: TNG NIR observations
  95. GRB 110128A: TAROT-Calern refined analysis
  96. GRB 110128A: Swift/UVOT observations
  97. GRB 110128A: Swift-XRT refined Analysis
  98. GRB 110128A: WHT redshifts of nearby field galaxies
  99. GRB 110128A: VLT/X-shooter redshift
  100. GRB 110128A: Enhanced Swift-XRT position

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