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"

28054 results found.

  1. IPN triangulation of GRB020706
  2. GRB 020705: Optical observations
  3. GRB 020625, optical observations
  4. GRB 020625: Optical observations
  5. GRB 020531: optical photometry of Chandra sources
  6. GRB020625 (=H2081): A Long Burst Localized by HETE
  7. The Probable Host Galaxy of GRB/XRF 020427
  8. GRB/XRF 020427, detection of an underlying system with the VLT
  9. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  10. AXP 1E2259+586 optical observations
  11. Fading Optical Source in the Field of GRB020531
  12. GRB 020531, INT+WFC deep optical upper limits
  13. SGR-like Bursts from the AXP 1E 2259+586
  14. GRB020405: polarimetric observations
  15. GRB 020531, simultaneous optical observations
  16. GRB 020531/Candidate Redshift
  17. GRB020531: Detection of Candidate Host Galaxy
  18. GRB020531: Second epoch Chandra observations
  19. GRB020604, optical observations
  20. GRB020604, BVRcIc field photometry
  21. GRB020603, BVRcIc field observations
  22. GRB020531, BVRcIc field photometry
  23. GRB020531 Optical Observations
  24. GRB020531: Observations with the Chandra X-ray Observatory
  25. GRB020531, optical observations
  26. GRB020531: optical observations
  27. GRB020531(=H2042): Optical Observations
  28. GRB020531(=H2042): Optical Observations
  29. GRB020531: Optical observations
  30. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  31. GRB020525, optical observations
  32. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  33. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  34. HST detection of the likely host galaxy of GRB 020124
  35. GRB020405 field photometry at ESO
  36. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  37. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  38. GRB020321 : Optical observations.
  39. XRF 020427
  40. GRB 020124: Optical observations
  41. IPN triangulation of GRB020418
  42. GRB020405: VLT observations of the OT environment
  43. IPN triangulation of GRB020413
  44. GRB020405: predicted break
  45. GRB 020409: No Evidence for an Optical Afterglow
  46. GRB 020331 Kyoto observation on March 31
  47. GRB020410: BeppoSAX NFI observation
  48. X-ray afterglow of GRB020321
  49. GRB020331 optical observations with RIMOTS
  50. GRB020124 optical observations with RIBOTS/RIMOTS
  51. GRB 020321: Candidate X-ray Counterparts
  52. GRB020406(?), optical observations
  53. GRB 020405: Decay index
  54. Short RXTE/ASM transient 020406; may be a GRB
  55. GRB020405, Radio Observations
  56. GRB 020405, U-band observations
  57. GRB011212: Optical Observations
  58. GRB 020331: NIR Observations
  59. GRB020331 NIR observation at KPNO (re-submission)
  60. GRB02033 NIR observation at KPNO
  61. GRB020331 field photometry
  62. GRB 020331, NIR observations
  63. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  64. GRB 020322: BeppoSAX observations of the X-ray afterglow
  65. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  66. Near-Infrared Observations of GRB020322 at TIRGO
  67. GRB 020321, Radio Observations
  68. GRB 020322: Optical Observations
  69. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  70. GRB 020321: Optical observations
  71. GRB020317 BVRI field photometry
  72. GRB011211 revised BVRI field photometry
  73. GRB020305 BVRI field photometry
  74. GRB020322 BVRI field photometry
  75. GRB 020322: Optical Sources and Improved Astrometry
  76. GRB020317: optical observations
  77. GRB020321 optical observations
  78. GRB020321: a faint BeppoSAX detection
  79. GRB 020317 : KISO Optical Observations
  80. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  81. GRB 020305: Optical Observations
  82. GRB020317, optical observations
  83. GRB 020317: Optical observations
  84. GRB 011121: Third HST Epoch
  85. GRB020305: Properties of the Candidate Optical Afterglow
  86. GRB 011121: HST Observations reveal an intermediate-time multicolor
  87. GRB011130 (XRF011130) Second Epoch Chandra Observations
  88. GRB020305: Subaru Optical Observations
  89. XRF/GRB 011030: Detection of the Probable Host Galaxy
  90. GRB 020305: Candidate optical afterglow
  91. GRB020305, optical observations
  92. IPN triangulation of GRB020305 (HETE 1939)
  93. GRB020305 (=H1939): Localization of a GRB by HETE
  94. HST Imaging of the afterglow and host of GRB 011121
  95. IPN detection and localization of Cygnus X-1 flares
  96. SGR1900+14 activity
  97. IPN Upper Limits to a GRB Associated With SN2002ap
  98. GRB020124 BVRI field photometry
  99. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  100. SN2002ap (SN/GRB?) Echelle spectra

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