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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"

26388 results found.

  1. IPN triangulation of GRB030509 (small errror box)
  2. GRB030329, BVRI photometry
  3. GRB030429, refiend optical brightness
  4. GRB 030329: Optical limit (contemporaneous photography)
  5. GRB030418, BVRcIc field photometry
  6. GRB030429, BVRcIc field photometry
  7. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  8. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  9. GRB030329: RTT150 optical observations and upper limit for a host
  10. GRB030501, optical observation
  11. GRB030501 triangulation (correction to GCN 2194)
  12. GRB030329: RTT150 optical observations and upper limit for a host
  13. GRB 030429: redshift from VLT spectroscopy
  14. GRB030501B triangulation (single error box)
  15. GRB 030329, BVRI photometry
  16. GRB030429: Optical Observations
  17. GRB030501: TAROT candidate afterglow present in archival images
  18. GRB 030429: confirmation of afterglow candidate
  19. GRB 030329 Oprical observations in Rozhen observatory
  20. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  21. IPN triangulation of GRB030425 (single error box)
  22. GRB 030329, the review of the sky area in plate archive (1950-1998)
  23. GRB 030329: optical spectropolarimetry at VLT
  24. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  25. GRB030329: optical polarization
  26. IPN triangulation of GRB030422 (two large error boxes)
  27. GRB030329, optical observation
  28. MASTER:optical observations GRB030418
  29. MASTER:optical observations probable GRB030414
  30. GRB030418: Kiso near infrared observations
  31. GRB 030418: Optical afterglow
  32. OT GRB 030329: early UBVRcIc spectral evolution
  33. OT GRB 030329: early spectrum
  34. IPN triangulation of GRB030414 (small error box)
  35. IPN triangulation of GRB030413 (small error box)
  36. Superluminal motion in GRB 030329 (Correction)
  37. Superluminal motion in GRB 030329
  38. GRB030329, optical position
  39. IPN triangulation of GRB030406 (small error box)
  40. IPN triangulation of GRB050403 (small error box)
  41. GRB 030329: BVRI photometry at Asiago
  42. GRB 030329: VLT V-band photometry
  43. Kiso observation of the GRB030329 at April 6
  44. GRB 030329, color evolution
  45. GRB030328, UBVRcIc field photometry
  46. GRB 030329 Optical observations
  47. GRB030329: Kiso B and R band observations
  48. GRB030328: R upper limit after 6 hours by MASTER
  49. SDSS 0.5m PT observations of GRB030329 (correction)
  50. SDSS 0.5m PT observations of GRB030329
  51. GRB030329: final R-band light curve by MASTER
  52. GRB030329, optical observation
  53. GRB030329, new UBVRcIc field photometry
  54. GRB 030329, light curve and SN prediction
  55. GRB 030329, BRI photometry
  56. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  57. GRB030329: Optical observations at Teramo
  58. GRB 030329: Radio observations at GMRT
  59. Further AAVSO V,B,R observations of GRB030329
  60. GRB 030329: Additional Mt. Laguna Optical Observations
  61. GRB 030329: Observations with ANDICAM
  62. GRB030329: further optical photometry and evidence for a light curve discontinuity
  63. triangulation of GRB 030331 (single error box)
  64. GRB 030329: optical observations
  65. Photometry of GRB030329 - Constant OT Magnitude
  66. GRB030329 - OT brightens
  67. GRB 030329, optical photometry
  68. GRB 030324: Optical and NIR Observations
  69. GRB030329: R band light curve by MASTER
  70. GRB030329 - Light curve flattening
  71. GRB 030324, optical search
  72. GRB 030329, optical observations
  73. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  74. GRB030329a: detection by Konus-Wind
  75. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  76. GRB030329, BVRcIc field photometry
  77. GRB030329, SPM optical observations
  78. GRB 030329: Optical decay and synthesis
  79. GRB030329 optical observations
  80. GRB 030329: Optical pre-Imaging
  81. GRB 030329: Upper limit from 5.6 hours before trigger
  82. GRB030328: X-ray Afterglow Observed with Chandra
  83. GRB 030329, R-band observations
  84. GRB 030329: OT B and R photometry, decline rate
  85. GRB030329: Upper limits from recent and historical observations.
  86. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  87. GRB 030329: Optical Afterglow Observations
  88. GRB 030328: optical observations
  89. GRB 030329: Optical afterglow fading
  90. GRB 030328: OT photometry
  91. GRB030328: optical spectroscopy at TNG
  92. GRB030328: optical photometry at the TNG
  93. VLT spectra of GRB 030328
  94. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  95. GRB 030328: Optical observations
  96. GRB030324 optical observation
  97. GRB030131, BVRcIc field photometry
  98. Possible GRB030323 localized by INTEGRAL
  99. GRB030323: Detection on 2003/03/24
  100. IPN triangulation of GRB030326 (single small error box)

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