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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"

26328 results found.

  1. XRF030723 (= H2777): Chandra Observations Scheduled
  2. XRF030723, BVRcIc field photometry correction
  3. XRF030723, ROTSE-III Early Observations
  4. XRF030723, BVRcIc field photometry
  5. XRF 030723, optical observations
  6. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  7. Konus-Wind detection of the bursts from SGR1806-20 region
  8. SGR 1806-20, submm observations
  9. RXTE PCA Observations of SGR1806-20 Region
  10. IPN triangulation of GRB030714 (two large error boxes)
  11. IPN triangulation of GRB030715 (two large error boxes)
  12. GRB030706 triangulation (single large error box)
  13. GRB030329, optical observation in May
  14. IPN triangulation of GRB030626 (single large error box)
  15. IPN triangulation of GRB030626 (two large error boxes)
  16. GRB030329: second XMM-Newton observation
  17. GRB030329 -- RATAN-600 data in April-May
  18. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  19. IPN triangulation of GRB030606 (two alternate error boxes)
  20. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  21. GRB 030528: tentative NIR counterpart
  22. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  23. GRB030528, BVRI field photometry
  24. GRB030329, SPM optical observations
  25. GRB030528: Chandra TOO Planned
  26. GRB030528(=H2724): Revised SXC Localization
  27. GRB 030528 Bisei optical observation
  28. GRB030528 (H2724): A long GRB localized by HETE
  29. GRB 030329: Correction to GCN 2254
  30. GRB 030329: Optical Observations
  31. GRB 030528 (=H2724) Kyoto optical observation
  32. GRB 030416: Optical Observations
  33. GRB 030329 Optical Observations
  34. GRB030329: XMM-Newton observation
  35. GRB 021004: HST observations
  36. GRB030324: Further Observations of the Candidate Optical Afterglow
  37. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  38. IPN triangulation of GRB030519B=H2716 (small error box)
  39. HETE GRB030329, correction to Rc Observations in Loiano
  40. GRB 030329: Optical limit (contemporaneous imaging)
  41. IPN triangulation of GRB030509 (small errror box)
  42. GRB030329, BVRI photometry
  43. GRB030429, refiend optical brightness
  44. GRB 030329: Optical limit (contemporaneous photography)
  45. GRB030418, BVRcIc field photometry
  46. GRB030429, BVRcIc field photometry
  47. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  48. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  49. GRB030329: RTT150 optical observations and upper limit for a host
  50. GRB030501, optical observation
  51. GRB030501 triangulation (correction to GCN 2194)
  52. GRB030329: RTT150 optical observations and upper limit for a host
  53. GRB 030429: redshift from VLT spectroscopy
  54. GRB030501B triangulation (single error box)
  55. GRB 030329, BVRI photometry
  56. GRB030429: Optical Observations
  57. GRB030501: TAROT candidate afterglow present in archival images
  58. GRB 030429: confirmation of afterglow candidate
  59. GRB 030329 Oprical observations in Rozhen observatory
  60. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  61. IPN triangulation of GRB030425 (single error box)
  62. GRB 030329, the review of the sky area in plate archive (1950-1998)
  63. GRB 030329: optical spectropolarimetry at VLT
  64. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  65. GRB030329: optical polarization
  66. IPN triangulation of GRB030422 (two large error boxes)
  67. GRB030329, optical observation
  68. MASTER:optical observations GRB030418
  69. MASTER:optical observations probable GRB030414
  70. GRB030418: Kiso near infrared observations
  71. GRB 030418: Optical afterglow
  72. OT GRB 030329: early UBVRcIc spectral evolution
  73. OT GRB 030329: early spectrum
  74. IPN triangulation of GRB030414 (small error box)
  75. IPN triangulation of GRB030413 (small error box)
  76. Superluminal motion in GRB 030329 (Correction)
  77. Superluminal motion in GRB 030329
  78. GRB030329, optical position
  79. IPN triangulation of GRB030406 (small error box)
  80. IPN triangulation of GRB050403 (small error box)
  81. GRB 030329: BVRI photometry at Asiago
  82. GRB 030329: VLT V-band photometry
  83. Kiso observation of the GRB030329 at April 6
  84. GRB 030329, color evolution
  85. GRB030328, UBVRcIc field photometry
  86. GRB 030329 Optical observations
  87. GRB030329: Kiso B and R band observations
  88. GRB030328: R upper limit after 6 hours by MASTER
  89. SDSS 0.5m PT observations of GRB030329 (correction)
  90. SDSS 0.5m PT observations of GRB030329
  91. GRB030329: final R-band light curve by MASTER
  92. GRB030329, optical observation
  93. GRB030329, new UBVRcIc field photometry
  94. GRB 030329, light curve and SN prediction
  95. GRB 030329, BRI photometry
  96. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  97. GRB030329: Optical observations at Teramo
  98. GRB 030329: Radio observations at GMRT
  99. Further AAVSO V,B,R observations of GRB030329
  100. GRB 030329: Additional Mt. Laguna Optical Observations

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