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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"

24887 results found.

  1. GRB030329, BVRI photometry
  2. GRB030429, refiend optical brightness
  3. GRB 030329: Optical limit (contemporaneous photography)
  4. GRB030418, BVRcIc field photometry
  5. GRB030429, BVRcIc field photometry
  6. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  7. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  8. GRB030329: RTT150 optical observations and upper limit for a host
  9. GRB030501, optical observation
  10. GRB030501 triangulation (correction to GCN 2194)
  11. GRB030329: RTT150 optical observations and upper limit for a host
  12. GRB 030429: redshift from VLT spectroscopy
  13. GRB030501B triangulation (single error box)
  14. GRB 030329, BVRI photometry
  15. GRB030429: Optical Observations
  16. GRB030501: TAROT candidate afterglow present in archival images
  17. GRB 030429: confirmation of afterglow candidate
  18. GRB 030329 Oprical observations in Rozhen observatory
  19. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  20. IPN triangulation of GRB030425 (single error box)
  21. GRB 030329, the review of the sky area in plate archive (1950-1998)
  22. GRB 030329: optical spectropolarimetry at VLT
  23. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  24. GRB030329: optical polarization
  25. IPN triangulation of GRB030422 (two large error boxes)
  26. GRB030329, optical observation
  27. MASTER:optical observations GRB030418
  28. MASTER:optical observations probable GRB030414
  29. GRB030418: Kiso near infrared observations
  30. GRB 030418: Optical afterglow
  31. OT GRB 030329: early UBVRcIc spectral evolution
  32. OT GRB 030329: early spectrum
  33. IPN triangulation of GRB030414 (small error box)
  34. IPN triangulation of GRB030413 (small error box)
  35. Superluminal motion in GRB 030329 (Correction)
  36. Superluminal motion in GRB 030329
  37. GRB030329, optical position
  38. IPN triangulation of GRB030406 (small error box)
  39. IPN triangulation of GRB050403 (small error box)
  40. GRB 030329: BVRI photometry at Asiago
  41. GRB 030329: VLT V-band photometry
  42. Kiso observation of the GRB030329 at April 6
  43. GRB 030329, color evolution
  44. GRB030328, UBVRcIc field photometry
  45. GRB 030329 Optical observations
  46. GRB030329: Kiso B and R band observations
  47. GRB030328: R upper limit after 6 hours by MASTER
  48. SDSS 0.5m PT observations of GRB030329 (correction)
  49. SDSS 0.5m PT observations of GRB030329
  50. GRB030329: final R-band light curve by MASTER
  51. GRB030329, optical observation
  52. GRB030329, new UBVRcIc field photometry
  53. GRB 030329, light curve and SN prediction
  54. GRB 030329, BRI photometry
  55. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  56. GRB030329: Optical observations at Teramo
  57. GRB 030329: Radio observations at GMRT
  58. Further AAVSO V,B,R observations of GRB030329
  59. GRB 030329: Additional Mt. Laguna Optical Observations
  60. GRB 030329: Observations with ANDICAM
  61. GRB030329: further optical photometry and evidence for a light curve discontinuity
  62. triangulation of GRB 030331 (single error box)
  63. GRB 030329: optical observations
  64. Photometry of GRB030329 - Constant OT Magnitude
  65. GRB030329 - OT brightens
  66. GRB 030329, optical photometry
  67. GRB 030324: Optical and NIR Observations
  68. GRB030329: R band light curve by MASTER
  69. GRB030329 - Light curve flattening
  70. GRB 030324, optical search
  71. GRB 030329, optical observations
  72. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  73. GRB030329a: detection by Konus-Wind
  74. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  75. GRB030329, BVRcIc field photometry
  76. GRB030329, SPM optical observations
  77. GRB 030329: Optical decay and synthesis
  78. GRB030329 optical observations
  79. GRB 030329: Optical pre-Imaging
  80. GRB 030329: Upper limit from 5.6 hours before trigger
  81. GRB030328: X-ray Afterglow Observed with Chandra
  82. GRB 030329, R-band observations
  83. GRB 030329: OT B and R photometry, decline rate
  84. GRB030329: Upper limits from recent and historical observations.
  85. GRB030329 (=H2652): A Long, Extremely Bright GRB Localized by the HETE WXM and SXC
  86. GRB 030329: Optical Afterglow Observations
  87. GRB 030328: optical observations
  88. GRB 030329: Optical afterglow fading
  89. GRB 030328: OT photometry
  90. GRB030328: optical spectroscopy at TNG
  91. GRB030328: optical photometry at the TNG
  92. VLT spectra of GRB 030328
  93. GRB030328 (=H2650): A Long, Bright GRB Localized by the HETE WXM and SXC
  94. GRB 030328: Optical observations
  95. GRB030324 optical observation
  96. GRB030131, BVRcIc field photometry
  97. Possible GRB030323 localized by INTEGRAL
  98. GRB030323: Detection on 2003/03/24
  99. IPN triangulation of GRB030326 (single small error box)
  100. IPN triangulation of GRB030325 (two small error boxes)

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