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"

38349 results found.

  1. GRB 020409, No Optical Detection to R = 22
  2. GRB020410: second BeppoSAX NFI observation
  3. GRB 020409: No Evidence for an Optical Afterglow
  4. GRB 020409, 2nd epoch optical observations
  5. GRB 020331 Kyoto observation on March 31
  6. GRB 020409
  7. GRB 020409 SARA Observations
  8. GRB "020411"
  9. GRB 020409, No Optical Detection to R = 20
  10. GRB020410: BeppoSAX NFI observation
  11. GRB 020409: Optical observations
  12. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  13. GRB 020410, optical observations
  14. BeppoSAX ALERT: possible GRB020411
  15. GRB 020409, optical observations
  16. GRB 020409: Optical Observations
  17. GRB020406(?), optical observations
  18. GRB020410, optical observations
  19. BeppoSAX ALERT: possible GRB020410
  20. X-ray afterglow of GRB020321
  21. BeppoSAX GRB : GRB020409
  22. GRB020331: Confirmation of Afterglow Candidate with Magellan
  23. GRB020405: VLT optical observations and V band decay slope
  24. GRB020331 optical observations with RIMOTS
  25. GRB020124 optical observations with RIBOTS/RIMOTS
  26. GRB 020321: Candidate X-ray Counterparts
  27. ASM GRB candidate 020406 refined error box
  28. GRB 020405: Moderate-resolution spectroscopy
  29. GRB020331: Optical Observations of Afterglow Candidate
  30. GRB020406(?), optical observations
  31. GRB020405: VLT optical observations
  32. Revised Photometry of the Optical Afterglow of GRB 020405
  33. GRB 020331: Candidate Optical Afterglow
  34. Short RXTE/ASM transient 020406; may be a GRB
  35. GRB020405, Radio Observations
  36. GRB020405: VLT spectroscopy
  37. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  38. V band observations of GRB020405
  39. GRB 020405, U-band observations
  40. GRB 020405: Optical afterglow candidate
  41. IPN localization of GRB020405
  42. GRB011212: Optical Observations
  43. GRB020331 NIR observation at KPNO (re-submission)
  44. GRB02033 NIR observation at KPNO
  45. GRB020331 field photometry
  46. GRB 020331 Optical Observations
  47. GRB 020331, NIR observations
  48. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  49. GRB 020321: Infrared observations
  50. GRB 020322: BeppoSAX observations of the X-ray afterglow
  51. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  52. GRB 020322, Radio observations
  53. Near-Infrared Observations of GRB020322 at TIRGO
  54. GRB 020321, Radio Observations
  55. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  56. GRB 020321: Optical observations
  57. GRB020317 BVRI field photometry
  58. GRB011211 revised BVRI field photometry
  59. GRB020305 BVRI field photometry
  60. GRB020322 BVRI field photometry
  61. GRB 020322 optical observations
  62. GRB020322: Candidate Optical Afterglow
  63. GRB 020322 optical observation
  64. GRB020317 : Near IR Observations from Mt Abu Observatory
  65. GRB 020322: Optical Sources and Improved Astrometry
  66. GRB020322, optical observations
  67. GRB 020322: Optical candidate
  68. GRB020322: Optical Observations
  69. GRB020322: BeppoSAX/NFI Observations
  70. Bepposax GRB020322 The second springtime BSAX GRB
  71. GRB 020321: Optical observations
  72. GRB 011121: Fourth Epoch of HST Imaging
  73. GRB020317: optical observations
  74. GRB020321 optical observations
  75. GRB020321: a faint BeppoSAX detection
  76. GRB020305: NIR observations
  77. GRB 020317 : KISO Optical Observations
  78. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  79. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  80. GRB 020305: Optical Observations
  81. GRB020317, optical observations
  82. GRB 020317: Optical observations
  83. GRB 011121: Third HST Epoch
  84. GRB020305: Properties of the Candidate Optical Afterglow
  85. GRB 011121: HST Observations reveal an intermediate-time multicolor
  86. GRB011121, possible supernova association
  87. GRB011130 (XRF011130) Second Epoch Chandra Observations
  88. GRB020305: Subaru Optical Observations
  89. GRB 020305: Optical observations
  90. XRF/GRB 011030: Detection of the Probable Host Galaxy
  91. GRB 020305: Candidate optical afterglow
  92. Type Ic SN2002bl (SN/GRB?) Radio Observations
  93. GRB020305, optical observations
  94. IPN triangulation of GRB020305 (HETE 1939)
  95. GRB020305 (=H1939): Localization of a GRB by HETE
  96. GRB 020305: Optical observations
  97. HST Imaging of the afterglow and host of GRB 011121
  98. GRB 010921: HST Observations
  99. IPN detection and localization of Cygnus X-1 flares
  100. GRB020127: Further VLA Observations of Possible Counterparts

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