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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"

28047 results found.

  1. GRB030823: optical observation at Tokyo Tech
  2. Lulin follow-up observations of GRB030823
  3. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  4. IPN detection of continued activity from SGR1806-20
  5. GRB 030817 = H2808 TAROT optical observations
  6. SGR 1808-20 (=H2802): A Possible new SGR
  7. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  8. XRF 030723: Detection of a rebrightening in the optical afterglow
  9. XRF030723, BVRcIc field photometry update
  10. IPN triangulation of GRB030801 (large error box)
  11. GRB021206 optical counterpart upper limit
  12. IPN triangulation of GRB030726 (large error box)
  13. IPN triangulation of GRB030721 (large error box)
  14. XRF030723 Radio Observations
  15. XRF 030723: confirmation of fading optical counterpart
  16. XRF030723(=H2777): Chandra Observations
  17. GRB030723: Upper limits from historical observations
  18. XRF030723: Palomar observations and proposed counterpart
  19. GRB030725 (=H2779): A Bright GRB Localized by HETE
  20. XRF030723 (= H2777): Chandra Observations Scheduled
  21. XRF030723, BVRcIc field photometry correction
  22. XRF030723, ROTSE-III Early Observations
  23. XRF030723, BVRcIc field photometry
  24. XRF 030723, optical observations
  25. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  26. Konus-Wind detection of the bursts from SGR1806-20 region
  27. SGR 1806-20, submm observations
  28. RXTE PCA Observations of SGR1806-20 Region
  29. IPN triangulation of GRB030714 (two large error boxes)
  30. IPN triangulation of GRB030715 (two large error boxes)
  31. GRB030706 triangulation (single large error box)
  32. GRB030329, optical observation in May
  33. IPN triangulation of GRB030626 (single large error box)
  34. IPN triangulation of GRB030626 (two large error boxes)
  35. GRB030329: second XMM-Newton observation
  36. GRB030329 -- RATAN-600 data in April-May
  37. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  38. IPN triangulation of GRB030606 (two alternate error boxes)
  39. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  40. GRB 030528: tentative NIR counterpart
  41. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  42. GRB030528, BVRI field photometry
  43. GRB030329, SPM optical observations
  44. GRB030528: Chandra TOO Planned
  45. GRB030528(=H2724): Revised SXC Localization
  46. GRB 030528 Bisei optical observation
  47. GRB030528 (H2724): A long GRB localized by HETE
  48. GRB 030329: Correction to GCN 2254
  49. GRB 030329: Optical Observations
  50. GRB 030528 (=H2724) Kyoto optical observation
  51. GRB 030416: Optical Observations
  52. GRB 030329 Optical Observations
  53. GRB030329: XMM-Newton observation
  54. GRB 021004: HST observations
  55. GRB030324: Further Observations of the Candidate Optical Afterglow
  56. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  57. IPN triangulation of GRB030519B=H2716 (small error box)
  58. HETE GRB030329, correction to Rc Observations in Loiano
  59. GRB 030329: Optical limit (contemporaneous imaging)
  60. IPN triangulation of GRB030509 (small errror box)
  61. GRB030329, BVRI photometry
  62. GRB030429, refiend optical brightness
  63. GRB 030329: Optical limit (contemporaneous photography)
  64. GRB030418, BVRcIc field photometry
  65. GRB030429, BVRcIc field photometry
  66. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  67. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  68. GRB030329: RTT150 optical observations and upper limit for a host
  69. GRB030501, optical observation
  70. GRB030501 triangulation (correction to GCN 2194)
  71. GRB030329: RTT150 optical observations and upper limit for a host
  72. GRB 030429: redshift from VLT spectroscopy
  73. GRB030501B triangulation (single error box)
  74. GRB 030329, BVRI photometry
  75. GRB030429: Optical Observations
  76. GRB030501: TAROT candidate afterglow present in archival images
  77. GRB 030429: confirmation of afterglow candidate
  78. GRB 030329 Oprical observations in Rozhen observatory
  79. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  80. IPN triangulation of GRB030425 (single error box)
  81. GRB 030329, the review of the sky area in plate archive (1950-1998)
  82. GRB 030329: optical spectropolarimetry at VLT
  83. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  84. GRB030329: optical polarization
  85. IPN triangulation of GRB030422 (two large error boxes)
  86. GRB030329, optical observation
  87. MASTER:optical observations GRB030418
  88. MASTER:optical observations probable GRB030414
  89. GRB030418: Kiso near infrared observations
  90. GRB 030418: Optical afterglow
  91. OT GRB 030329: early UBVRcIc spectral evolution
  92. OT GRB 030329: early spectrum
  93. IPN triangulation of GRB030414 (small error box)
  94. IPN triangulation of GRB030413 (small error box)
  95. Superluminal motion in GRB 030329 (Correction)
  96. Superluminal motion in GRB 030329
  97. GRB030329, optical position
  98. IPN triangulation of GRB030406 (small error box)
  99. IPN triangulation of GRB050403 (small error box)
  100. GRB 030329: BVRI photometry at Asiago

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