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"

20966 results found.

  1. GRB 020625: Optical observations
  2. GRB 020531: optical photometry of Chandra sources
  3. HETE #2081: Optical observations
  4. The Probable Host Galaxy of GRB/XRF 020427
  5. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  6. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  7. AXP 1E2259+586 optical observations
  8. Fading Optical Source in the Field of GRB020531
  9. GRB 020531, INT+WFC deep optical upper limits
  10. SGR-like Bursts from the AXP 1E 2259+586
  11. GRB020405: polarimetric observations
  12. GRB 020531, simultaneous optical observations
  13. GRB 020604, optical observations
  14. GRB 020531/Candidate Redshift
  15. GRB020531: Second epoch Chandra observations
  16. GRB020604, optical observations
  17. GRB020603, BVRcIc field observations
  18. GRB020531 Optical observations with TAROT
  19. GRB020531 Optical observations with TAROT
  20. GRB 020418, optical/near-IR observations
  21. GRB 020531, Radio Observations
  22. GRB020531 Optical Observations
  23. GRB020531: Observations with the Chandra X-ray Observatory
  24. GRB 020603: Optical Observations
  25. GRB020531: Upper Limit for Detection of Two TAROT Sources
  26. GRB 020603: Optical observations
  27. GRB 020531 optical observations with TAROT
  28. GRB020531, optical observations
  29. GRB020531: optical observations
  30. GRB020531(=H2042): Optical Observations
  31. GRB020531(=H2042): Optical Observations
  32. GRB020531: Optical observations
  33. GRB 020525: Optical Observations
  34. GRB020525, optical observations
  35. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  36. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  37. GRB/XRF 020427, Radio Observations
  38. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  39. GRB020321 : Optical observations.
  40. GRB020427 BeppoSAX NFI Observation
  41. XRF 020427
  42. GRB020331: Third Epoch and Revised Second Epoch Optical
  43. The end of BSAX GRB activities
  44. GRB 020410, Radio Observations
  45. GRB 020418: Optical observations
  46. GRB 020124: Optical observations
  47. GRB 020418: Optical observations
  48. GRB020405: VLT observations of the OT environment
  49. GRB020410: BeppoSAX NFI observations refined analysis
  50. GRB 020409: Optical Observations
  51. GRB 020409, 2-nd epoch optical observations at Terskol.
  52. GRB020405: predicted break
  53. GRB 020409: Optical observations
  54. GRB 020409, 2nd epoch optical observations
  55. GRB 020409
  56. GRB 020409 SARA Observations
  57. GRB "020411"
  58. GRB 020409: Optical observations
  59. GRB 020410, optical observations
  60. GRB 020409, optical observations
  61. GRB 020409: Optical Observations
  62. GRB020406(?), optical observations
  63. GRB020410, optical observations
  64. GRB020331: Confirmation of Afterglow Candidate with Magellan
  65. GRB020405: VLT optical observations and V band decay slope
  66. GRB020331 optical observations with RIMOTS
  67. GRB020124 optical observations with RIBOTS/RIMOTS
  68. GRB 020405: Moderate-resolution spectroscopy
  69. GRB020331: Optical Observations of Afterglow Candidate
  70. GRB020406(?), optical observations
  71. GRB020405: VLT optical observations
  72. Revised Photometry of the Optical Afterglow of GRB 020405
  73. GRB020405: OT observations
  74. GRB 020331: Candidate Optical Afterglow
  75. GRB 020405: Decay index
  76. Short RXTE/ASM transient 020406; may be a GRB
  77. GRB020405, Radio Observations
  78. V band observations of GRB020405
  79. GRB 020405, U-band observations
  80. GRB011212: Optical Observations
  81. GRB 020331: NIR Observations
  82. GRB 020331: NIR Observations
  83. GRB020331 NIR observation at KPNO (re-submission)
  84. GRB02033 NIR observation at KPNO
  85. GRB 020331 Optical Observations
  86. GRB 020331, NIR observations
  87. GRB 020331: Optical observations
  88. GRB 020321: Infrared observations
  89. GRB 020322: BeppoSAX observations of the X-ray afterglow
  90. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  91. GRB 020322, Radio observations
  92. Near-Infrared Observations of GRB020322 at TIRGO
  93. GRB 020321, Radio Observations
  94. GRB 020322: Optical Observations
  95. GRB 020321: Optical observations
  96. GRB 020322 optical observations
  97. GRB020317 : Near IR Observations from Mt Abu Observatory
  98. GRB020322, optical observations
  99. GRB020322: Optical Observations
  100. GRB020322: BeppoSAX/NFI 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