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"

36212 results found.

  1. GRB020321 optical observations
  2. GRB020321: BeppoSAX/NFI Observations
  3. GRB020321: a faint BeppoSAX detection
  4. GRB 020317 : KISO Optical Observations
  5. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  6. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  7. GRB 020305: Optical Observations
  8. GRB020317, optical observations
  9. GRB 020317: Optical observations
  10. GRB 011121: Third HST Epoch
  11. GRB020305: Properties of the Candidate Optical Afterglow
  12. GRB 011121: HST Observations reveal an intermediate-time multicolor
  13. GRB011121, possible supernova association
  14. GRB011130 (XRF011130) Second Epoch Chandra Observations
  15. GRB020305: Subaru Optical Observations
  16. GRB 020305: Optical observations
  17. XRF/GRB 011030 Images
  18. XRF/GRB 011030: Detection of the Probable Host Galaxy
  19. GRB 020305: Candidate optical afterglow
  20. Type Ic SN2002bl (SN/GRB?) Radio Observations
  21. GRB020305: Optical Observations
  22. IPN triangulation of GRB020305 (HETE 1939)
  23. GRB020305 (=H1939): Localization of a GRB by HETE
  24. GRB 020305: Optical observations
  25. HST Imaging of the afterglow and host of GRB 011121
  26. GRB 010921: HST Observations
  27. IPN detection and localization of Cygnus X-1 flares
  28. GRB020127: Further VLA Observations of Possible Counterparts
  29. IPN detection of further SGR1900+14 activity
  30. SGR1900+14 activity
  31. IPN/HETE Detection of Bursts from SGR1900+14
  32. IPN Upper Limits to a GRB Associated With SN2002ap
  33. GRB020124 BVRI field photometry
  34. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  35. SN2002ap (SN/GRB?) Echelle spectra
  36. SN2002ap (SN/GRB?) optical spectrographic observations
  37. GRB020127 Optical Observations
  38. SN 2002ap (SN/GRB?)
  39. SN2002ap (SN/GRB?) UBVRI Field Photometry
  40. GRB020127: Chandra Observations and Prospective Counterparts
  41. pre-SN2002ap (SN/GRB?) imaging of M74
  42. SN 2002ap (hypernova / GRB ??): special list on VSNET
  43. Type Ib/c SN2002ap (SN/GRB?)
  44. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  45. GRB020124, optical observations
  46. GRB020127: Optical observations
  47. GRB 020127, I-band observations starting 3.14-hr after the event
  48. IPN detection of further activity from SGR1806-20
  49. IPN triangulation of GRB020127 (=H1902)
  50. GRB010921 Optical Observations
  51. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  52. GRB020124: Optical observations
  53. VLT observations of GRB 020124: The fading optical/near-infrared afterglow
  54. GRB020124: Optical observations
  55. GRB 020124: Optical observations
  56. GRB 020124 Optical Observations
  57. IPN triangulation of GRB020124 (HETE 1896)
  58. IPN observations of SGR1806-20
  59. GRB 020124: Optical afterglow
  60. GRB020124(=H1896): Localization of a Long GRB by HETE
  61. GRB optical counterpart candidate in GCN 1217 is M dwarf
  62. Possible optical counterpart to a GRB
  63. GRB011212, Optical Observations
  64. GRB 011211: Detection of the Probable Host Galaxy
  65. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  66. GRB 011211, spectrum and optical photometry
  67. GRB 011130: Optical Observations of X-ray and Radio Sources
  68. GRB 011130, Radio/X-ray Comparison
  69. GRB 011212: optical observation at Asiago
  70. GRB 011211: Evidence for an Optical Break
  71. GRB 011211: TNG Spectroscopic Observations
  72. optical follow-up of GRB(XRF) 011211
  73. GRB 011212: optical observation at Oslo (relayed)
  74. GRB 011211: Optical Spectroscopy
  75. GRB 011211, Optical Observations
  76. GRB011212, BVRI field photometry
  77. GRB011211, BVRI field photometry
  78. GRB011212: Optical observations
  79. GRB 011211: BVRi-band photometry
  80. GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
  81. Fading of the optical source associated of XRF 011211
  82. GRB 011211 Optical Observations: Likely Afterglow
  83. BeppoSAX Alert: GRB011211(=XRF011211)
  84. GRB 011130: Optical Observations of Chandra Sources
  85. GRB 011130: Optical Observations of Chandra sources
  86. GRB 011130: Magellan spectroscopy
  87. Sub-mm and Centimeter Detections of the Host Galaxy of GRB000418
  88. GRB011130, optical observations
  89. GRB 011130, K band observations
  90. GRB011130, optical observations
  91. GRB 011130 I-band Observation
  92. GRB011130 (XRF011130) optical observations
  93. GRB011130 (XRF011130) SDSS PT i-band observations
  94. Detection of the X-ray afterglow of GRB011121 by BeppoSAX
  95. XRF011130: NEAT Optical Observations
  96. GRB011130 (=XRF011130): Revised Localization of an X-ray
  97. GRB001109, Radio Monitoring
  98. GRB 011121: Errata URL
  99. GRB 011121
  100. GRB011130 (=H1864): An X-Ray Rich GRB Detected by HETE

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