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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').

269 results found.

  1. GRB 110420B: Swift/UVOT Upper Limits
  2. Swift/UVOT observations of GRB110223b
  3. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  4. GRB 101008A: MASTER prompt optical observations
  5. GRB 100909A: Faulkes Telescope North afterglow candidate
  6. GRB 100905A: Swift/UVOT Upper Limits
  7. GRB 100823A: Candidate IR afterglow
  8. Swift-BAT refined analysis of trigger 421262
  9. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  10. GRB 100413A: Faulkes Telescope South observations
  11. GRB 100206A: Swift/UVOT Upper Limits
  12. GRB 090814B: Liverpool Telescope Observations
  13. GRB090423 - Swift/UVOT upper limits.
  14. GRB 090419: Swift/UVOT Observations
  15. GRB 090417B: Gemini imaging
  16. A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
  17. ATCA observation of SGR J1550-5418
  18. Konus-RF catches first GRB and SGR bursts
  19. SGR J1550-5418
  20. Ongoing activity of AXP/SGR 1E1547.0-5408
  21. SGR activity seen by BAT during ICSP Ionospheric Events
  22. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  23. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  24. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  25. IBAS Alert N. 5442 is not a GRB
  26. Suzaku ToO Observation of AXP 1E 1547.0-5408
  27. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  28. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  29. Konus-Wind detection of very bright SGR-like burst on January 25, 2009
  30. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  31. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  32. Swift-BAT trigger 340734 is not a GRB
  33. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  34. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  35. AXP 1E1547.0-5408: Fermi GBM observations
  36. Trigger 340734: Swift detection of a possible short burst
  37. AXP 1E1547.0-5408 activity with SGR bursts
  38. Swift/UVOT observations of GRB 081221
  39. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  40. INTEGRAL ToO observation of the AXP 1E 1547.0-5408
  41. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  42. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  43. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  44. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  45. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  46. Trigger 330353: Swift detection of a Galactic short soft burst
  47. GRB 071021: Magellan R-band observation
  48. GRB 071017: a SHORT GRB detected by INTEGRAL
  49. Swift/UVOT refined analysis of GRB070529
  50. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  51. GRB 060522: Swift/XRT Team refined analysis
  52. GRB 060202: Swift XRT Team Refined Analysis
  53. GRB050915: P60 Optical Observations
  54. IPN detection of continued activity from SGR1806-20
  55. GRB 030329 Optical Observations
  56. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  57. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  58. AXP 1E2259+586: quasi-simultaneous optical observation
  59. AXP 1E2259+586 optical observations
  60. SGR-like Bursts from the AXP 1E 2259+586
  61. GRB010923 as seen by BeppoSAX GRBM
  62. GRB Observation Report
  63. GRB990705, VLT-FORS1 observations of the host galaxy
  64. Optical observations of GRB000210
  65. GRB 000210: BATSE Observations
  66. GRB000210, Radio Observations
  67. IPN triangulation of GRB000210
  68. GRB991216 Optical and IR observations
  69. GRB 981220, radio observations

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