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"

16030 results found.

  1. GRB 060121: HST observations
  2. GRB 060218/SN 2006aj: K-380 optical observations
  3. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  4. GRB200618: optical polarimetry and photometry
  5. GRB 060218/SN 2006aj: ABT observations
  6. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  7. GRB 060218 : Radio upper limits from GMRT
  8. GRB 060218/SN 2006aj: WIRO optical observations
  9. GRB 060218/SN 2006aj: RBO optical observations
  10. GRB 060204B: GETS early limit
  11. GRB 060223A:Xinglong optical limits
  12. GRB 060223B: ART optical limits
  13. GRB 060218: rebrightening
  14. Correction to GCN 4816 on GRB060218
  15. GRB 060218/SN 2006aj: optical observations
  16. GRB060218: Optical brightening in V and R
  17. GRB 060223: Keck redshift
  18. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  19. Spectral properties of GRB060218/SN2006aj
  20. GRB 060218: rebrightening
  21. GRB 060218: emergence of the underlying SN spectrum
  22. GRB 060218: Decline in r-band flux
  23. GRB 060218: spectroscopic observations
  24. GRB060218: Optical Spectroscopy of GRB-SN
  25. GRB060218: VLT spectroscopy
  26. GRB 060218: Optical Observations at Xinglong Obs.
  27. GRB060218: UV Detection and Light Curves
  28. GRB060218: Radio Afterglow Discovery
  29. GRB 060218: MDM Redshift
  30. GRB 060218: optical/nIR observations at La Palma
  31. Oddball GRB 060218, transient or GRB?
  32. Brightening of the Optical Counterpart of the Possible GRB 060218
  33. GRB 060218: MDM Observations
  34. GRB 060218A: ROTSE-III Possible Optical Flare
  35. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  36. GRB 060213: optical afterglow not confirmed
  37. Swift UVOT observations of GRB060213
  38. GRB 060213: optical afterglow candidate
  39. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  40. GRB 060210: Radio Observations
  41. GRB060211B: REM optical and NIR observations
  42. GRB060121: optical observations
  43. GRB060110: optical observations
  44. GRB060105: optical observations
  45. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  46. GRB 050826: Optical Afterglow and Host Galaxy
  47. GRB060211b: optical observation
  48. GRB 060210: Optical Observations
  49. GRB060211: Faulkes North observation
  50. GRB 060211: ROTSE-III Optical Limits
  51. GRB060210: Swift XRT Refined Analysis
  52. GRB060206, optical observations
  53. GRB 060210 : Xinglong and Lulin optical limit
  54. GRB060210: Optical Observations
  55. GRB060210: Gemini absorption spectroscopy
  56. GRB060210: Early Optical Observations
  57. GRB 060210: optical evolution
  58. GRB060210: Optical afterglow
  59. GRB060209: RTT150 optical observations
  60. GRB 060209 : TAROT optical observation
  61. GRB060209A: MASTER optical observation
  62. GRB 060206: WSRT Radio Observations
  63. GRB 060121 : WIDGET Pre-trigger limit
  64. GRB 060206: optical observations at Asiago
  65. Orphan GRB Afterglow candidate
  66. GRB 060206: Subaru/FOCAS optical spectroscopy
  67. GRB 060206: Super-LOTIS observations
  68. GRB060204A: Swift/UVOT observations
  69. GRB 060206 : Lulin optical observations
  70. GRB060206: Swift XRT Refined Analysis
  71. GRB060206: Liverpool Telescope observation
  72. GRB060206: P60 Optical Observations
  73. GRB060206: Swift XRT Position
  74. GRB 060206: RAPTOR observations of afterglow candidate variability.
  75. GRB 060206: High redshift burst
  76. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  77. GRB060206: Optical afterglow
  78. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  79. GRB060203: WHT Z-band observations
  80. GRB060204C: optical observation
  81. GRB 060204B: BVRi-band detections of optical afterglow
  82. GRB 060204A: FRAM optical observations
  83. GRB 060204C: optical observations
  84. GRB 060204B: ART early limit
  85. GRB060204B: Swift XRT Team Refined Analysis
  86. GRB 060204C: BOOTES-IR optical limits
  87. GRB 060204C: Liverpool Telescopes optical limit
  88. GRB 060204C: ROTSE-III Optical Limits
  89. GRB 060124: Radio Observations
  90. GRB 060204B: ART optical limit
  91. GRB060204B, optical observation
  92. GRB 060203: RTT150 optical observations
  93. GRB060203: Swift XRT Team Refined Analysis
  94. GRB060203 - Swift UVOT observation
  95. GRB 060203: P60 Confirmation of Optical Afterglow
  96. Possible GRB 060203: candidate optical counterpart
  97. Possible GRB 060203: optical observations at Asiago
  98. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  99. GRB060202, optical observation
  100. GRB060202: Faulkes North observation

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