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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"

26357 results found.

  1. GRB030913: Subaru Optical Observations
  2. GRB 030913, optical candidate
  3. GRB 030913, BOOTES observations
  4. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  5. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  6. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  7. XRF030824: Optical observations
  8. IPN triangulation of GRB030903 (large error box)
  9. IPN triangulation of GRB030827 (large error box)
  10. GRB030823: optical observations
  11. GRB030823: optical observation at Tokyo Tech
  12. Lulin follow-up observations of GRB030823
  13. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  14. IPN detection of continued activity from SGR1806-20
  15. GRB 030817 = H2808 TAROT optical observations
  16. SGR 1808-20 (=H2802): A Possible new SGR
  17. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  18. XRF 030723: Detection of a rebrightening in the optical afterglow
  19. XRF030723, BVRcIc field photometry update
  20. IPN triangulation of GRB030801 (large error box)
  21. GRB021206 optical counterpart upper limit
  22. IPN triangulation of GRB030726 (large error box)
  23. IPN triangulation of GRB030721 (large error box)
  24. XRF030723 Radio Observations
  25. XRF 030723: confirmation of fading optical counterpart
  26. XRF030723(=H2777): Chandra Observations
  27. GRB030723: Upper limits from historical observations
  28. XRF030723: Palomar observations and proposed counterpart
  29. GRB030725 (=H2779): A Bright GRB Localized by HETE
  30. XRF030723 (= H2777): Chandra Observations Scheduled
  31. XRF030723, BVRcIc field photometry correction
  32. XRF030723, ROTSE-III Early Observations
  33. XRF030723, BVRcIc field photometry
  34. XRF 030723, optical observations
  35. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  36. Konus-Wind detection of the bursts from SGR1806-20 region
  37. SGR 1806-20, submm observations
  38. RXTE PCA Observations of SGR1806-20 Region
  39. IPN triangulation of GRB030714 (two large error boxes)
  40. IPN triangulation of GRB030715 (two large error boxes)
  41. GRB030706 triangulation (single large error box)
  42. GRB030329, optical observation in May
  43. IPN triangulation of GRB030626 (single large error box)
  44. IPN triangulation of GRB030626 (two large error boxes)
  45. GRB030329: second XMM-Newton observation
  46. GRB030329 -- RATAN-600 data in April-May
  47. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  48. IPN triangulation of GRB030606 (two alternate error boxes)
  49. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  50. GRB 030528: tentative NIR counterpart
  51. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  52. GRB030528, BVRI field photometry
  53. GRB030329, SPM optical observations
  54. GRB030528: Chandra TOO Planned
  55. GRB030528(=H2724): Revised SXC Localization
  56. GRB 030528 Bisei optical observation
  57. GRB030528 (H2724): A long GRB localized by HETE
  58. GRB 030329: Correction to GCN 2254
  59. GRB 030329: Optical Observations
  60. GRB 030528 (=H2724) Kyoto optical observation
  61. GRB 030416: Optical Observations
  62. GRB 030329 Optical Observations
  63. GRB030329: XMM-Newton observation
  64. GRB 021004: HST observations
  65. GRB030324: Further Observations of the Candidate Optical Afterglow
  66. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  67. IPN triangulation of GRB030519B=H2716 (small error box)
  68. HETE GRB030329, correction to Rc Observations in Loiano
  69. GRB 030329: Optical limit (contemporaneous imaging)
  70. IPN triangulation of GRB030509 (small errror box)
  71. GRB030329, BVRI photometry
  72. GRB030429, refiend optical brightness
  73. GRB 030329: Optical limit (contemporaneous photography)
  74. GRB030418, BVRcIc field photometry
  75. GRB030429, BVRcIc field photometry
  76. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  77. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  78. GRB030329: RTT150 optical observations and upper limit for a host
  79. GRB030501, optical observation
  80. GRB030501 triangulation (correction to GCN 2194)
  81. GRB030329: RTT150 optical observations and upper limit for a host
  82. GRB 030429: redshift from VLT spectroscopy
  83. GRB030501B triangulation (single error box)
  84. GRB 030329, BVRI photometry
  85. GRB030429: Optical Observations
  86. GRB030501: TAROT candidate afterglow present in archival images
  87. GRB 030429: confirmation of afterglow candidate
  88. GRB 030329 Oprical observations in Rozhen observatory
  89. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  90. IPN triangulation of GRB030425 (single error box)
  91. GRB 030329, the review of the sky area in plate archive (1950-1998)
  92. GRB 030329: optical spectropolarimetry at VLT
  93. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  94. GRB030329: optical polarization
  95. IPN triangulation of GRB030422 (two large error boxes)
  96. GRB030329, optical observation
  97. MASTER:optical observations GRB030418
  98. MASTER:optical observations probable GRB030414
  99. GRB030418: Kiso near infrared observations
  100. GRB 030418: Optical afterglow

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