Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

41195 results found.

  1. GRB020406(?), optical observations
  2. GRB020405: VLT optical observations
  3. Revised Photometry of the Optical Afterglow of GRB 020405
  4. GRB020405: OT observations
  5. GRB 020331: Candidate Optical Afterglow
  6. GRB 020405: Decay index
  7. Short RXTE/ASM transient 020406; may be a GRB
  8. GRB020405, Radio Observations
  9. GRB020405: VLT spectroscopy
  10. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  11. V band observations of GRB020405
  12. GRB 020405, U-band observations
  13. GRB 020405: Optical afterglow candidate
  14. IPN localization of GRB020405
  15. GRB011212: Optical Observations
  16. GRB 020331: NIR Observations
  17. GRB 020331: NIR Observations
  18. GRB020331 NIR observation at KPNO (re-submission)
  19. GRB02033 NIR observation at KPNO
  20. GRB020331 field photometry
  21. GRB 020331 Optical Observations
  22. GRB 020331, NIR observations
  23. GRB 020331: Optical observations
  24. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  25. GRB 020321: Infrared observations
  26. GRB 020322: BeppoSAX observations of the X-ray afterglow
  27. SN 2002ap - peak brightness date (SN/GRB?)
  28. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  29. GRB 020322, Radio observations
  30. Near-Infrared Observations of GRB020322 at TIRGO
  31. GRB 020321, Radio Observations
  32. GRB 020322: Optical Observations
  33. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  34. GRB 020321: Optical observations
  35. GRB020317 BVRI field photometry
  36. GRB011211 revised BVRI field photometry
  37. GRB020305 BVRI field photometry
  38. GRB020322 BVRI field photometry
  39. GRB 020322 optical observations
  40. GRB020322: Candidate Optical Afterglow
  41. GRB 020322 optical observation
  42. GRB020317 : Near IR Observations from Mt Abu Observatory
  43. GRB 020322: Optical Sources and Improved Astrometry
  44. GRB020322, optical observations
  45. GRB 020322: Optical candidate
  46. XMM-Newton observation of GRB020322
  47. GRB020322: Optical Observations
  48. Bepposax GRB020322 The second springtime BSAX GRB
  49. GRB 020321: Optical observations
  50. GRB020317: optical observations
  51. GRB020321 optical observations
  52. GRB020321: a faint BeppoSAX detection
  53. GRB020305: NIR observations
  54. GRB 020317 : KISO Optical Observations
  55. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  56. GRB 020305: Optical Observations
  57. GRB020317, optical observations
  58. GRB 020317: Optical observations
  59. GRB 011121: Third HST Epoch
  60. GRB020305: Properties of the Candidate Optical Afterglow
  61. GRB 011121: HST Observations reveal an intermediate-time multicolor
  62. GRB011121, possible supernova association
  63. GRB011130 (XRF011130) Second Epoch Chandra Observations
  64. GRB020305: Subaru Optical Observations
  65. GRB 020305: Optical observations
  66. XRF/GRB 011030: Detection of the Probable Host Galaxy
  67. GRB 020305: Candidate optical afterglow
  68. Type Ic SN2002bl (SN/GRB?) Radio Observations
  69. GRB020305, optical observations
  70. GRB020305: Optical Observations
  71. IPN triangulation of GRB020305 (HETE 1939)
  72. GRB020305 (=H1939): Localization of a GRB by HETE
  73. GRB 020305: Optical observations
  74. HST Imaging of the afterglow and host of GRB 011121
  75. GRB 010921: HST Observations
  76. IPN detection and localization of Cygnus X-1 flares
  77. GRB020127: Further VLA Observations of Possible Counterparts
  78. RXTE Observations of SGR 1900+14
  79. IPN detection of further SGR1900+14 activity
  80. SGR1900+14 activity
  81. IPN/HETE Detection of Bursts from SGR1900+14
  82. IPN Upper Limits to a GRB Associated With SN2002ap
  83. GRB020124 BVRI field photometry
  84. GRB020127: Palomar and VLA Observations of Possible Counterparts
  85. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  86. SN2002ap (SN/GRB?) Echelle spectra
  87. SN2002ap (SN/GRB?) optical spectrographic observations
  88. GRB020127, WSRT radio observations
  89. GRB020127 Optical Observations
  90. SN 2002ap (SN/GRB?)
  91. SN 2002ap in M74
  92. SN2002ap (SN/GRB?) UBVRI Field Photometry
  93. GRB020127: Chandra Observations and Prospective Counterparts
  94. pre-SN2002ap (SN/GRB?) imaging of M74
  95. SN 2002ap (hypernova / GRB ??): special list on VSNET
  96. Type Ib/c SN2002ap (SN/GRB?)
  97. Type Ib/c SN2002ap (SN/GRB?) Radio Observations
  98. GRB020124, optical observations
  99. GRB020127: Optical observations
  100. GRB 020127, I-band observations starting 3.14-hr after the event

Advanced

Download all Circulars as a .tar.gz archive:
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