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"

28048 results found.

  1. The Probable Host Galaxy of GRB/XRF 020427
  2. GRB/XRF 020427, detection of an underlying system with the VLT
  3. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  4. AXP 1E2259+586 optical observations
  5. Fading Optical Source in the Field of GRB020531
  6. GRB 020531, INT+WFC deep optical upper limits
  7. SGR-like Bursts from the AXP 1E 2259+586
  8. GRB020405: polarimetric observations
  9. GRB 020531, simultaneous optical observations
  10. GRB 020531/Candidate Redshift
  11. GRB020531: Detection of Candidate Host Galaxy
  12. GRB020531: Second epoch Chandra observations
  13. GRB020604, optical observations
  14. GRB020604, BVRcIc field photometry
  15. GRB020603, BVRcIc field observations
  16. GRB020531, BVRcIc field photometry
  17. GRB020531 Optical Observations
  18. GRB020531: Observations with the Chandra X-ray Observatory
  19. GRB020531, optical observations
  20. GRB020531: optical observations
  21. GRB020531(=H2042): Optical Observations
  22. GRB020531(=H2042): Optical Observations
  23. GRB020531: Optical observations
  24. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  25. GRB020525, optical observations
  26. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  27. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  28. HST detection of the likely host galaxy of GRB 020124
  29. GRB020405 field photometry at ESO
  30. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  31. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  32. GRB020321 : Optical observations.
  33. XRF 020427
  34. GRB 020124: Optical observations
  35. IPN triangulation of GRB020418
  36. GRB020405: VLT observations of the OT environment
  37. IPN triangulation of GRB020413
  38. GRB020405: predicted break
  39. GRB 020409: No Evidence for an Optical Afterglow
  40. GRB 020331 Kyoto observation on March 31
  41. GRB020410: BeppoSAX NFI observation
  42. X-ray afterglow of GRB020321
  43. GRB020331 optical observations with RIMOTS
  44. GRB020124 optical observations with RIBOTS/RIMOTS
  45. GRB 020321: Candidate X-ray Counterparts
  46. GRB020406(?), optical observations
  47. GRB 020405: Decay index
  48. Short RXTE/ASM transient 020406; may be a GRB
  49. GRB020405, Radio Observations
  50. GRB 020405, U-band observations
  51. GRB011212: Optical Observations
  52. GRB 020331: NIR Observations
  53. GRB020331 NIR observation at KPNO (re-submission)
  54. GRB02033 NIR observation at KPNO
  55. GRB020331 field photometry
  56. GRB 020331, NIR observations
  57. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  58. GRB 020322: BeppoSAX observations of the X-ray afterglow
  59. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  60. Near-Infrared Observations of GRB020322 at TIRGO
  61. GRB 020321, Radio Observations
  62. GRB 020322: Optical Observations
  63. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  64. GRB 020321: Optical observations
  65. GRB020317 BVRI field photometry
  66. GRB011211 revised BVRI field photometry
  67. GRB020305 BVRI field photometry
  68. GRB020322 BVRI field photometry
  69. GRB 020322: Optical Sources and Improved Astrometry
  70. GRB020317: optical observations
  71. GRB020321 optical observations
  72. GRB020321: a faint BeppoSAX detection
  73. GRB 020317 : KISO Optical Observations
  74. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  75. GRB 020305: Optical Observations
  76. GRB020317, optical observations
  77. GRB 020317: Optical observations
  78. GRB 011121: Third HST Epoch
  79. GRB020305: Properties of the Candidate Optical Afterglow
  80. GRB 011121: HST Observations reveal an intermediate-time multicolor
  81. GRB011130 (XRF011130) Second Epoch Chandra Observations
  82. GRB020305: Subaru Optical Observations
  83. XRF/GRB 011030: Detection of the Probable Host Galaxy
  84. GRB 020305: Candidate optical afterglow
  85. GRB020305, optical observations
  86. IPN triangulation of GRB020305 (HETE 1939)
  87. GRB020305 (=H1939): Localization of a GRB by HETE
  88. HST Imaging of the afterglow and host of GRB 011121
  89. IPN detection and localization of Cygnus X-1 flares
  90. SGR1900+14 activity
  91. IPN Upper Limits to a GRB Associated With SN2002ap
  92. GRB020124 BVRI field photometry
  93. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  94. SN2002ap (SN/GRB?) Echelle spectra
  95. GRB020127 Optical Observations
  96. SN 2002ap in M74
  97. SN2002ap (SN/GRB?) UBVRI Field Photometry
  98. GRB020127: Chandra Observations and Prospective Counterparts
  99. pre-SN2002ap (SN/GRB?) imaging of M74
  100. Type Ib/c SN2002ap (SN/GRB?) Radio Observations

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