Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

16155 results found.

  1. No IPN GRB detected in conjunction with candidate GRB 110215
  2. GRB GRB 110223A: MASTER VWF early optical observations
  3. Swift/UVOT observations of GRB110223b
  4. GRB 110223A : early optical limit by "Pi of the Sky"
  5. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  6. OT 110215: Further NIR observations from NOT of the GRB candidate
  7. GRB 110213B: Swift/UVOT observations
  8. Swift XRT and UVOT Observations of OT 110215
  9. OT 110215: NIR observations from NOT of GRB candidate
  10. GRB 110213A: optical observations in CrAO
  11. GRB 110213B: GROND observations of the optical/NIR afterglow
  12. GRB 110213A: optical observations in Mondy
  13. OT 110215: possible GRB from 2MASS J00264184+8324093
  14. Swift/UVOT observations of GRB110210a.
  15. GRB 110210A: optical upper limit
  16. GRB 110213B: Gemini South Redshift
  17. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  18. GRB 110213B: P60 Optical Afterglow Candidate
  19. GRB 110213A: TNT optical observations
  20. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  21. Swift GRB110213A: interesting behaviour
  22. GRB 110205A: Konkoly optical observations
  23. GRB 110213A: MITSuME Akeno Optical Observation
  24. GRB110213A: MITSuME Okayama Optical Observation
  25. GRB 110213A: THO optical observations
  26. GRB 110213A: Lightbuckets Optical Observations
  27. GRB 110213A: optical observations
  28. GRB110212A: MITSuME Okayama optical upper limits
  29. GRB 110213A: GRAS011 optical observations
  30. GRB 110213A: Bok Telescope Redshift
  31. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  32. GRB 110213A: P60 Optical Afterglow Detection
  33. GRB 110213A: Swift detection of a burst with optical afterglow
  34. GRB 110212A: GRT Optical Observation
  35. GRB 110212A: SARA-N Optical Limits
  36. GRB110212A: BOOTES-2/TELMA optical limits
  37. GRB 110212A: ROTSE-III Optical Limits
  38. GRB 110205A: detection of optical linear polarization from CAHA
  39. GRB 110210A: optical upper limit
  40. GRB 110201A: optical observations
  41. GRB 110208A: Magellan confirmation of the optical afterglow
  42. Swift/UVOT observations of GRB110208a
  43. GRB 110208A: Potential afterglow from Magellan
  44. GRB 110208A: Magellan optical observations
  45. GRB 110206A: SMARTS optical/IR afterglow decay
  46. GRB 110205A: optical observations in Mondy observatory
  47. GRB 110205A : HCT optical observations
  48. GRB 110206A: SMARTS optical/IR afterglow candidate observations
  49. GRB 110207A: TAROT Calern observatory optical observations
  50. GRB 110205A - Continued PAIRITEL NIR Observations
  51. GRB 110205A: WSRT radio observation
  52. GRB110205A: CARMA 3mm Observations
  53. GRB 110207A: MASTER prompt and early optical observations
  54. GRB 110206A: TAROT La Silla observatory optical observations
  55. GRB 110205A: Lightbuckets Optical Observations
  56. GRB 110205A : Lulin optical observation
  57. GRB110205A: MITSuME Ishigakijima Optical Observation
  58. GRB110205A: MITSuME Okayama Optical Observation
  59. GRB110205A: SMA 1.3mm Observations
  60. GRB 110205A: Swift/UVOT Continuing Observations
  61. GRB 110205A: Lulin optical observations and temporal decay index
  62. GRB 110205A: Newcastle Observatory Optical Observations
  63. GRB 101225A is likely at z~0
  64. GRB 110205A: optical flare confirmation
  65. GRB 110205A: NOT redshift confirmation
  66. GRB 110205A: FAST Redshift
  67. GRB 110205A: GRAS005 optical observations
  68. GRB 110205A: PAIRITEL NIR Afterglow Detection
  69. GRB 110205A: TAROT Calern observatory detection of an optical flare
  70. GRB 110205A: ROTSE-III, Optical Counterpart is flaring to ~14 mag
  71. GRB 110205A: TAROT Calern observatory optical detection
  72. GRB 110205A: Swift detection of a burst with an optical candidate
  73. GRB110201A: MITSuME Okayama optical upper limits
  74. Swift/UVOT observations of GRB110201A
  75. GRB 110201A: MASTER optical observations
  76. GRB110128A: MITSuME Okayama optical upper limits
  77. GRB 101112A: Maidanak and CrAO optical observations
  78. GRB110128A: TNG NIR observations
  79. GRB 110128A: TAROT-Calern refined analysis
  80. GRB 110128A: Swift/UVOT observations
  81. GRB 110128A: VLT/X-shooter redshift
  82. GRB 110106B, radio observations
  83. GRB 110120A: MASTER optical observations
  84. GRB 101225A: CQUEAN optical observation
  85. GRB 110106A: CrAO optical observations
  86. GRB 110112A: optical upper limit
  87. GRB 110120A: MASTER optical observations
  88. GRB110119A: MITSuME Okayama optical upper limits
  89. GRB 110119A: PAIRITEL NIR Afterglow Detection
  90. GRB 110119A: Swift detection of a burst with an optical detection
  91. GRB 101219B: GROND detection of a SN signature
  92. GRB 101219B: Likely the GRB host emission dominates now in the uvw2 filter
  93. Short GRB 110112B : early optical limit by "Pi of the Sky"
  94. The Christmas burst GRB 101225A - optical spectroscopy with GTC
  95. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  96. GRB 101225A: HST observations - no host detected
  97. GRB 101225A: Redshift retraction and results of additional photometric follow-up at the NOT
  98. GRB 110112A: Swift/UVOT upper limits
  99. GRB 110112A: MASTER optical observations
  100. GRB 110106B: MASTER optical observations

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