Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

42622 results found.

  1. IPN triangulation of GRB020525
  2. XRF 020427: Sudden Ionospheric Disturbance (SID)
  3. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  4. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  5. IPN triangulation of a burst from SGR1806-20
  6. GRB/XRF 020427, Radio Observations
  7. HST detection of the likely host galaxy of GRB 020124
  8. GRB020405 field photometry at ESO
  9. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  10. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  11. GRB020321 : Optical observations.
  12. GRB020427 BeppoSAX NFI Observation
  13. XRF 020427
  14. GRB020331: Third Epoch and Revised Second Epoch Optical
  15. The end of BSAX GRB activities
  16. GRB 020410, Radio Observations
  17. GRB 020418: Optical observations
  18. GRB 020124: Optical observations
  19. GRB 020418: Optical observations
  20. IPN triangulation of GRB020418
  21. GRB020405: VLT observations of the OT environment
  22. GRB020410: BeppoSAX NFI observations refined analysis
  23. GRB 020409: Optical Observations
  24. Mars Odyssey joins the IPN
  25. IPN triangulation of GRB020413
  26. GRB 020409, 2-nd epoch optical observations at Terskol.
  27. GRB020405: predicted break
  28. GRB 020409: Optical observations
  29. GRB 020409, No Optical Detection to R = 22
  30. GRB020410: second BeppoSAX NFI observation
  31. GRB 020409: No Evidence for an Optical Afterglow
  32. GRB 020409, 2nd epoch optical observations
  33. GRB 020331 Kyoto observation on March 31
  34. GRB 020409
  35. GRB 020409 SARA Observations
  36. GRB "020411"
  37. GRB 020409, No Optical Detection to R = 20
  38. GRB020410: BeppoSAX NFI observation
  39. GRB 020409: Optical observations
  40. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  41. GRB 020410, optical observations
  42. BeppoSAX ALERT: possible GRB020411
  43. GRB 020409, optical observations
  44. GRB 020409: Optical Observations
  45. GRB020406(?), optical observations
  46. GRB020410, optical observations
  47. BeppoSAX ALERT: possible GRB020410
  48. X-ray afterglow of GRB020321
  49. BeppoSAX GRB : GRB020409
  50. GRB020331: Confirmation of Afterglow Candidate with Magellan
  51. GRB020405: VLT optical observations and V band decay slope
  52. GRB020331 optical observations with RIMOTS
  53. GRB020124 optical observations with RIBOTS/RIMOTS
  54. GRB 020321: Candidate X-ray Counterparts
  55. ASM GRB candidate 020406 refined error box
  56. GRB 020405: Moderate-resolution spectroscopy
  57. GRB020331: Optical Observations of Afterglow Candidate
  58. GRB020406(?), optical observations
  59. GRB020405: VLT optical observations
  60. Revised Photometry of the Optical Afterglow of GRB 020405
  61. GRB020405: OT observations
  62. GRB 020331: Candidate Optical Afterglow
  63. GRB 020405: Decay index
  64. Short RXTE/ASM transient 020406; may be a GRB
  65. GRB020405, Radio Observations
  66. GRB020405: VLT spectroscopy
  67. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  68. V band observations of GRB020405
  69. GRB 020405, U-band observations
  70. GRB 020405: Optical afterglow candidate
  71. IPN localization of GRB020405
  72. GRB011212: Optical Observations
  73. GRB 020331: NIR Observations
  74. GRB 020331: NIR Observations
  75. GRB020331 NIR observation at KPNO (re-submission)
  76. GRB02033 NIR observation at KPNO
  77. GRB020331 field photometry
  78. GRB 020331 Optical Observations
  79. GRB 020331, NIR observations
  80. GRB 020331: Optical observations
  81. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  82. GRB 020321: Infrared observations
  83. GRB 020322: BeppoSAX observations of the X-ray afterglow
  84. SN 2002ap - peak brightness date (SN/GRB?)
  85. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  86. Near-Infrared Observations of GRB020322 at TIRGO
  87. GRB 020321, Radio Observations
  88. GRB 020322: Optical Observations
  89. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  90. GRB 020321: Optical observations
  91. GRB020317 BVRI field photometry
  92. GRB011211 revised BVRI field photometry
  93. GRB020305 BVRI field photometry
  94. GRB020322 BVRI field photometry
  95. GRB 020322 optical observations
  96. GRB 020322 optical observation
  97. GRB020317 : Near IR Observations from Mt Abu Observatory
  98. GRB 020322: Optical Sources and Improved Astrometry
  99. GRB020322, optical observations
  100. GRB 020322: Optical candidate

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