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"

32552 results found.

  1. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  2. GRB 020322, Radio observations
  3. Near-Infrared Observations of GRB020322 at TIRGO
  4. GRB 020321, Radio Observations
  5. GRB 020322: Optical Observations
  6. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  7. GRB 020321: Optical observations
  8. GRB020317 BVRI field photometry
  9. GRB011211 revised BVRI field photometry
  10. GRB020305 BVRI field photometry
  11. GRB020322 BVRI field photometry
  12. GRB 020322 optical observations
  13. GRB020322: Candidate Optical Afterglow
  14. GRB 020322 optical observation
  15. GRB 020322: Optical Sources and Improved Astrometry
  16. GRB020322, optical observations
  17. GRB 020322: Optical candidate
  18. XMM-Newton observation of GRB020322
  19. GRB020322: Optical Observations
  20. GRB 020321: Optical observations
  21. GRB 011121: Fourth Epoch of HST Imaging
  22. GRB020317: optical observations
  23. GRB020321 optical observations
  24. GRB020305: NIR observations
  25. GRB 020317 : KISO Optical Observations
  26. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  27. GRB 020305: Optical Observations
  28. GRB020317, optical observations
  29. GRB 011121: Third HST Epoch
  30. GRB020305: Properties of the Candidate Optical Afterglow
  31. GRB 011121: HST Observations reveal an intermediate-time multicolor
  32. GRB011121, possible supernova association
  33. GRB011130 (XRF011130) Second Epoch Chandra Observations
  34. GRB020305: Subaru Optical Observations
  35. GRB 020305: Optical observations
  36. XRF/GRB 011030 Images
  37. XRF/GRB 011030: Detection of the Probable Host Galaxy
  38. GRB 020305: Candidate optical afterglow
  39. Type Ic SN2002bl (SN/GRB?) Radio Observations
  40. GRB020305 (=H1939): Localization of a GRB by HETE
  41. HST Imaging of the afterglow and host of GRB 011121
  42. GRB 010921: HST Observations
  43. GRB020127: Further VLA Observations of Possible Counterparts
  44. IPN detection of further SGR1900+14 activity
  45. SGR1900+14 activity
  46. GRB020124 BVRI field photometry
  47. GRB020127: Palomar and VLA Observations of Possible Counterparts
  48. GRB020127, WSRT radio observations
  49. GRB020127 Optical Observations
  50. SN2002ap (SN/GRB?) UBVRI Field Photometry
  51. GRB020127: Chandra Observations and Prospective Counterparts
  52. pre-SN2002ap (SN/GRB?) imaging of M74
  53. Type Ib/c SN2002ap (SN/GRB?)
  54. GRB020127: Optical observations
  55. GRB 020127, I-band observations starting 3.14-hr after the event
  56. IPN triangulation of GRB020127 (=H1902)
  57. GRB020127 Optical Observations -- Erratum to GCN 1230
  58. GRB010921 Optical Observations
  59. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  60. GRB020124: Optical observations
  61. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  62. GRB020124: Optical observations
  63. GRB 020124: Optical observations
  64. GRB 020124 Optical Observations
  65. IPN triangulation of GRB020124 (HETE 1896)
  66. GRB 020124: Optical afterglow
  67. GRB020124(=H1896): Localization of a Long GRB by HETE
  68. GRB optical counterpart candidate in GCN 1217 is M dwarf
  69. GRB011212, Optical Observations
  70. GRB011211: BeppoSAX/GRBM data
  71. Optical polarization observations for GRB011211
  72. Color indices of the afterglow of GRB011211
  73. GRB011212: Optical observations at Gunma
  74. GRB 011211, spectrum and optical photometry
  75. GRB 011130: Optical Observations of X-ray and Radio Sources
  76. GRB 011130, Radio/X-ray Comparison
  77. GRB011212: Optical observations
  78. GRB 011212: optical observation at Asiago
  79. GRB 011211: Evidence for an Optical Break
  80. GRB 011211: TNG Spectroscopic Observations
  81. optical follow-up of GRB(XRF) 011211
  82. GRB 011212: optical observation at Oslo (relayed)
  83. GRB 011211: Optical Spectroscopy
  84. GRB 011211, Optical Observations
  85. GRB011212, BVRI field photometry
  86. GRB011211, BVRI field photometry
  87. GRB011212: Optical observations
  88. GRB 011211: BVRi-band photometry
  89. Fading of the optical source associated of XRF 011211
  90. XMM-Newton observation of GRB011211
  91. GRB 011211 Optical Observations: Likely Afterglow
  92. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  93. GRB 011130: Optical Observations of Chandra Sources
  94. GRB 011130: Optical Observations of Chandra sources
  95. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  96. GRB 011130: Magellan spectroscopy
  97. GRB011130, optical observations
  98. GRB011130, optical observations
  99. GRB011130 (=XRF011130): Second Revised Localization by HETE
  100. GRB 011130 I-band 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