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"

27392 results found.

  1. GRB 020813 : HST observations
  2. GRB 020812: early time optical observation at Ouda Station
  3. GRB020813: Magellan BVRI Photometry
  4. GRB 020819: Optical observations
  5. K band observation of GRB 020819
  6. GRB020813: optical and NIR observations
  7. GRB020813: Fading X-ray Afterglow Observed with Chandra
  8. GRB020813, UBVRI field calibration
  9. GRB020812: NIR observations
  10. Polarimetry of GRB020813: evidence for variability
  11. GRB020813 IRAM millimeter observations
  12. GRB020812: optical observations
  13. GRB020813: High-Resolution Optical Observations
  14. GRB 020812: optical observation at Bisei
  15. GRB020813: Early Time Magnitude
  16. Millimeter observation of GRB 020813
  17. GRB020812: optical observations
  18. GRB 020813 : KISO multiband optical observations
  19. GRB020813, optical observations
  20. IPN error box for GRB020813
  21. GRB020813, astrometric position
  22. Spectropolarimetry of GRB 020813
  23. GRB 020812 optical observation
  24. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  25. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  26. HST Imaging of the Host of GRB 011121
  27. GRB020801, optical afterglow candidate
  28. GRB020331: Late-time Optical Light Curve (re-submission)
  29. GRB020331: Late-time Optical Light Curve
  30. IPN triangulation of GRB020714
  31. IPN triangulation of GRB020715 (=GRB150702)
  32. IPN triangulation of GRB020714
  33. IPN triangulation of GRB150702
  34. GRB 020410: Discovery of Probable OT by HST
  35. GRB 020124, HST observations of the fading afterglow
  36. IPN triangulation of GRB020708
  37. IPN triangulation of GRB020708
  38. Correction to IPN error box for GRB020706
  39. IPN triangulation of GRB020706
  40. GRB 020705: Optical observations
  41. GRB 020625, optical observations
  42. GRB 020625: Optical observations
  43. GRB 020531: optical photometry of Chandra sources
  44. GRB020625 (=H2081): A Long Burst Localized by HETE
  45. The Probable Host Galaxy of GRB/XRF 020427
  46. GRB/XRF 020427, detection of an underlying system with the VLT
  47. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  48. AXP 1E2259+586 optical observations
  49. Fading Optical Source in the Field of GRB020531
  50. GRB 020531, INT+WFC deep optical upper limits
  51. SGR-like Bursts from the AXP 1E 2259+586
  52. GRB020405: polarimetric observations
  53. GRB 020531, simultaneous optical observations
  54. GRB 020531/Candidate Redshift
  55. GRB020531: Detection of Candidate Host Galaxy
  56. GRB020531: Second epoch Chandra observations
  57. GRB020604, optical observations
  58. GRB020604, BVRcIc field photometry
  59. GRB020603, BVRcIc field observations
  60. GRB020531, BVRcIc field photometry
  61. GRB020531 Optical Observations
  62. GRB020531: Observations with the Chandra X-ray Observatory
  63. GRB020531, optical observations
  64. GRB020531: optical observations
  65. GRB020531(=H2042): Optical Observations
  66. GRB020531(=H2042): Optical Observations
  67. GRB020531: Optical observations
  68. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  69. GRB020525, optical observations
  70. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  71. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  72. HST detection of the likely host galaxy of GRB 020124
  73. GRB020405 field photometry at ESO
  74. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  75. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  76. GRB020321 : Optical observations.
  77. XRF 020427
  78. GRB 020124: Optical observations
  79. IPN triangulation of GRB020418
  80. GRB020405: VLT observations of the OT environment
  81. IPN triangulation of GRB020413
  82. GRB020405: predicted break
  83. GRB 020409: No Evidence for an Optical Afterglow
  84. GRB 020331 Kyoto observation on March 31
  85. GRB020410: BeppoSAX NFI observation
  86. X-ray afterglow of GRB020321
  87. GRB020331 optical observations with RIMOTS
  88. GRB020124 optical observations with RIBOTS/RIMOTS
  89. GRB 020321: Candidate X-ray Counterparts
  90. GRB020406(?), optical observations
  91. GRB 020405: Decay index
  92. Short RXTE/ASM transient 020406; may be a GRB
  93. GRB020405, Radio Observations
  94. GRB 020405, U-band observations
  95. GRB011212: Optical Observations
  96. GRB 020331: NIR Observations
  97. GRB020331 NIR observation at KPNO (re-submission)
  98. GRB02033 NIR observation at KPNO
  99. GRB020331 field photometry
  100. GRB 020331, NIR observations

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