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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"

27401 results found.

  1. GRB030528 (H2724): A long GRB localized by HETE
  2. GRB 030329: Correction to GCN 2254
  3. GRB 030329: Optical Observations
  4. GRB 030528 (=H2724) Kyoto optical observation
  5. GRB 030416: Optical Observations
  6. GRB 030329 Optical Observations
  7. GRB030329: XMM-Newton observation
  8. GRB 021004: HST observations
  9. GRB030324: Further Observations of the Candidate Optical Afterglow
  10. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  11. IPN triangulation of GRB030519B=H2716 (small error box)
  12. HETE GRB030329, correction to Rc Observations in Loiano
  13. GRB 030329: Optical limit (contemporaneous imaging)
  14. IPN triangulation of GRB030509 (small errror box)
  15. GRB030329, BVRI photometry
  16. GRB030429, refiend optical brightness
  17. GRB 030329: Optical limit (contemporaneous photography)
  18. GRB030418, BVRcIc field photometry
  19. GRB030429, BVRcIc field photometry
  20. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  21. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  22. GRB030329: RTT150 optical observations and upper limit for a host
  23. GRB030501, optical observation
  24. GRB030501 triangulation (correction to GCN 2194)
  25. GRB030329: RTT150 optical observations and upper limit for a host
  26. GRB 030429: redshift from VLT spectroscopy
  27. GRB030501B triangulation (single error box)
  28. GRB 030329, BVRI photometry
  29. GRB030429: Optical Observations
  30. GRB030501: TAROT candidate afterglow present in archival images
  31. GRB 030429: confirmation of afterglow candidate
  32. GRB 030329 Oprical observations in Rozhen observatory
  33. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  34. IPN triangulation of GRB030425 (single error box)
  35. GRB 030329, the review of the sky area in plate archive (1950-1998)
  36. GRB 030329: optical spectropolarimetry at VLT
  37. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  38. GRB030329: optical polarization
  39. IPN triangulation of GRB030422 (two large error boxes)
  40. GRB030329, optical observation
  41. MASTER:optical observations GRB030418
  42. MASTER:optical observations probable GRB030414
  43. GRB030418: Kiso near infrared observations
  44. GRB 030418: Optical afterglow
  45. OT GRB 030329: early UBVRcIc spectral evolution
  46. OT GRB 030329: early spectrum
  47. IPN triangulation of GRB030414 (small error box)
  48. IPN triangulation of GRB030413 (small error box)
  49. Superluminal motion in GRB 030329 (Correction)
  50. Superluminal motion in GRB 030329
  51. GRB030329, optical position
  52. IPN triangulation of GRB030406 (small error box)
  53. IPN triangulation of GRB050403 (small error box)
  54. GRB 030329: BVRI photometry at Asiago
  55. GRB 030329: VLT V-band photometry
  56. Kiso observation of the GRB030329 at April 6
  57. GRB 030329, color evolution
  58. GRB030328, UBVRcIc field photometry
  59. GRB 030329 Optical observations
  60. GRB030329: Kiso B and R band observations
  61. GRB030328: R upper limit after 6 hours by MASTER
  62. SDSS 0.5m PT observations of GRB030329 (correction)
  63. SDSS 0.5m PT observations of GRB030329
  64. GRB030329: final R-band light curve by MASTER
  65. GRB030329, optical observation
  66. GRB030329, new UBVRcIc field photometry
  67. GRB 030329, light curve and SN prediction
  68. GRB 030329, BRI photometry
  69. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  70. GRB030329: Optical observations at Teramo
  71. GRB 030329: Radio observations at GMRT
  72. Further AAVSO V,B,R observations of GRB030329
  73. GRB 030329: Additional Mt. Laguna Optical Observations
  74. GRB 030329: Observations with ANDICAM
  75. GRB030329: further optical photometry and evidence for a light curve discontinuity
  76. triangulation of GRB 030331 (single error box)
  77. GRB 030329: optical observations
  78. Photometry of GRB030329 - Constant OT Magnitude
  79. GRB030329 - OT brightens
  80. GRB 030329, optical photometry
  81. GRB 030324: Optical and NIR Observations
  82. GRB030329: R band light curve by MASTER
  83. GRB030329 - Light curve flattening
  84. GRB 030324, optical search
  85. GRB 030329, optical observations
  86. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  87. GRB030329a: detection by Konus-Wind
  88. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  89. GRB030329, BVRcIc field photometry
  90. GRB030329, SPM optical observations
  91. GRB 030329: Optical decay and synthesis
  92. GRB030329 optical observations
  93. GRB 030329: Optical pre-Imaging
  94. GRB 030329: Upper limit from 5.6 hours before trigger
  95. GRB030328: X-ray Afterglow Observed with Chandra
  96. GRB 030329, R-band observations
  97. GRB 030329: OT B and R photometry, decline rate
  98. GRB030329: Upper limits from recent and historical observations.
  99. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  100. GRB 030329: Optical Afterglow Observations

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