Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26369 results found.

  1. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  2. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  3. HST Imaging of the Host of GRB 011121
  4. GRB020801, optical afterglow candidate
  5. GRB020331: Late-time Optical Light Curve (re-submission)
  6. GRB020331: Late-time Optical Light Curve
  7. IPN triangulation of GRB020714
  8. IPN triangulation of GRB020715 (=GRB150702)
  9. IPN triangulation of GRB020714
  10. IPN triangulation of GRB150702
  11. GRB 020410: Discovery of Probable OT by HST
  12. GRB 020124, HST observations of the fading afterglow
  13. IPN triangulation of GRB020708
  14. IPN triangulation of GRB020708
  15. Correction to IPN error box for GRB020706
  16. IPN triangulation of GRB020706
  17. GRB 020705: Optical observations
  18. GRB 020625, optical observations
  19. GRB 020625: Optical observations
  20. GRB 020531: optical photometry of Chandra sources
  21. GRB020625 (=H2081): A Long Burst Localized by HETE
  22. The Probable Host Galaxy of GRB/XRF 020427
  23. GRB/XRF 020427, detection of an underlying system with the VLT
  24. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  25. AXP 1E2259+586 optical observations
  26. Fading Optical Source in the Field of GRB020531
  27. GRB 020531, INT+WFC deep optical upper limits
  28. SGR-like Bursts from the AXP 1E 2259+586
  29. GRB020405: polarimetric observations
  30. GRB 020531, simultaneous optical observations
  31. GRB 020531/Candidate Redshift
  32. GRB020531: Detection of Candidate Host Galaxy
  33. GRB020531: Second epoch Chandra observations
  34. GRB020604, optical observations
  35. GRB020604, BVRcIc field photometry
  36. GRB020603, BVRcIc field observations
  37. GRB020531, BVRcIc field photometry
  38. GRB020531 Optical Observations
  39. GRB020531: Observations with the Chandra X-ray Observatory
  40. GRB020531, optical observations
  41. GRB020531: optical observations
  42. GRB020531(=H2042): Optical Observations
  43. GRB020531(=H2042): Optical Observations
  44. GRB020531: Optical observations
  45. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  46. GRB020525, optical observations
  47. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  48. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  49. HST detection of the likely host galaxy of GRB 020124
  50. GRB020405 field photometry at ESO
  51. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  52. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  53. GRB020321 : Optical observations.
  54. XRF 020427
  55. GRB 020124: Optical observations
  56. IPN triangulation of GRB020418
  57. GRB020405: VLT observations of the OT environment
  58. IPN triangulation of GRB020413
  59. GRB020405: predicted break
  60. GRB 020409: No Evidence for an Optical Afterglow
  61. GRB 020331 Kyoto observation on March 31
  62. GRB020410: BeppoSAX NFI observation
  63. X-ray afterglow of GRB020321
  64. GRB020331 optical observations with RIMOTS
  65. GRB020124 optical observations with RIBOTS/RIMOTS
  66. GRB 020321: Candidate X-ray Counterparts
  67. GRB020406(?), optical observations
  68. GRB 020405: Decay index
  69. Short RXTE/ASM transient 020406; may be a GRB
  70. GRB020405, Radio Observations
  71. GRB 020405, U-band observations
  72. GRB011212: Optical Observations
  73. GRB 020331: NIR Observations
  74. GRB020331 NIR observation at KPNO (re-submission)
  75. GRB02033 NIR observation at KPNO
  76. GRB020331 field photometry
  77. GRB 020331, NIR observations
  78. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  79. GRB 020322: BeppoSAX observations of the X-ray afterglow
  80. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  81. Near-Infrared Observations of GRB020322 at TIRGO
  82. GRB 020321, Radio Observations
  83. GRB 020322: Optical Observations
  84. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  85. GRB 020321: Optical observations
  86. GRB020317 BVRI field photometry
  87. GRB011211 revised BVRI field photometry
  88. GRB020305 BVRI field photometry
  89. GRB020322 BVRI field photometry
  90. GRB 020322: Optical Sources and Improved Astrometry
  91. GRB020317: optical observations
  92. GRB020321 optical observations
  93. GRB020321: a faint BeppoSAX detection
  94. GRB 020317 : KISO Optical Observations
  95. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  96. GRB 020305: Optical Observations
  97. GRB020317, optical observations
  98. GRB 020317: Optical observations
  99. GRB 011121: Third HST Epoch
  100. GRB020305: Properties of the Candidate Optical Afterglow

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